JP6735797B2 - Multi-core writing instrument - Google Patents

Description

The present invention relates to a multi-core writing instrument including a plurality of writing bodies.

Conventionally, as disclosed in Patent Document 1, a multi-core writing instrument including a plurality of writing bodies is known. In the multi-core writing instrument, writing is performed by selectively projecting one of the writing bodies from the front end of the barrel.

JP, 2013-220642, A

In the multi-core writing instrument disclosed in Patent Document 1, a mechanical pencil disposed at the center of a plurality of ballpoint pens in a barrel operates a clip disposed outside the barrel when the pen tip is in a protruding state. It is canceled by doing. In other words, the protruding state of the pen tip cannot be released by pressing the knock button attached to the rear end of the barrel. Therefore, in order to release the protruding state of the pen tip, the user is required to perform an operation different from that of the single-type writing instrument having only one writing body, which makes intuitive use difficult.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a multi-core writing instrument with improved operability.

In the first aspect of the present invention, the barrel, the first writing body provided inside the barrel at the radial center portion of the barrel, and the barrel inside the barrel radially outside the first writing body. At least two second writing bodies arranged on the first writing body and a first knock arranged on the rear end of the first writing body and configured to selectively project the first writing body from the front end of the barrel. A multi-core writing instrument comprising: a member; and a second knock member arranged at a rear end of a second writing body and configured to selectively project the second writing body from a front end of a barrel. There is provided a multi-core writing instrument characterized in that the projection of one writing body is released by an operation of a first knock member.

In the first aspect of the present invention, the first knock member includes the inner cylinder fixed to the shaft cylinder, a knock rod arranged in the inner cylinder and protruding rearward from the inner cylinder, and arranged in front of the knock rod. The knock rod and the rotor are configured to move in the axial direction in the inner cylinder, the knock rod has a cam surface, and the rotor has a cam receiving surface. The cam receiving surface is configured such that when the knock rod advances, the cam receiving surface receives axial and circumferential forces from the cam surface, and the inner cylinder and the rotor include a rotor that rotates in the circumferential direction as the knock rod advances. It is preferably arranged such that when it is rotated in the direction of, it engages or disengages from each other in the axial direction.

In the first aspect of the present invention, it is preferable that the protrusion of the second cursive body is released by operating the first knock member.

In the first aspect of the present invention, it is preferable that the protrusion of the first writing body is released by operating the second knock member.

In the first aspect of the present invention, the cam surface is formed on the second knock member, and the cam surface and the cam receiving surface of the second knock member have the cam receiving surface of the second knock member when the second knock member advances. It is preferably configured to receive axial and circumferential forces from the cam surface.

In the first aspect of the present invention, the second cam receiving surface is formed on the rotor, the cam surface is formed on the second knock member, and the cam surface of the second knock member and the second cam receiving surface are the second knock member. It is preferable that the second cam receiving surface is configured to receive axial and circumferential forces from the cam surface of the second knock member when moving forward.

In the first aspect of the present invention, it is preferable that the protrusion of the second cursive body is released by operating the second knock member of the other cursive body that is not protruding.

In the first aspect of the present invention, the protrusion of the second writing body is pressed radially outward by the second knocking member of the other second writing body in which the second knocking member of the second writing body does not project. It is preferably released.

In the first aspect of the present invention, the multi-core writing instrument further includes a transmission member disposed inside the second writing body in the radial direction inside the barrel, and the protrusion of the second writing body is the second writing body. It is preferable that the second knock member of the body is released by being pressed radially outward by the second knock member of the other second writing body that does not project through the transmission member.

In the first aspect of the present invention, it is preferable that the multi-core writing instrument further includes a spacer fixed to the inner peripheral surface of the barrel, and the transmission member is fixed to the spacer.

In the first aspect of the present invention, it is preferable that the axial length of the ink container of the first writing body is longer than that of the ink container of the second writing body.

In the first aspect of the invention, it is preferable that the ink filling amount of the ink container of the first writing body is larger than that of the ink container of the second writing body.

According to the present invention, a multi-core writing instrument with improved operability is provided.

1A and 1B are respectively a front view and a side view of a multi-core writing instrument according to a first embodiment of the present invention. 2A and 2B are respectively a front cross-sectional view of the multi-core writing instrument taken along the line BB of FIG. 1B and a cross section taken along the line AA of FIG. 1A. It is a side sectional view of a lead-type writing instrument. 3A to 3C are plan sectional views of the multi-core writing instrument taken along the lines CC, DD and EE of FIG. 2A, respectively. 4A to 4C are a front view and a side view of the rear barrel, respectively, and a front cross-sectional view of the rear barrel along the line FF in FIG. 4B. 5(a) to 5(e) are a front view, a side view, a bottom view, a perspective view of the inner cylinder, and a front cross-sectional view of the inner cylinder along the line GG in FIG. 5(b). .. 6A to 6D are a front view, a bottom view, a perspective view of the knock rod, and a cross-sectional view of the knock rod taken along the line HH of FIG. 6A, respectively. 7A to 7D are a front view, a plan view, a perspective view of the rotor, and a cross-sectional view of the rotor taken along the line I-I of FIG. 7A, respectively. 8A to 8C are a front view, a side view, and a perspective view of the second knock member, respectively. 9A and 9B are perspective views of the spacer, respectively. 10A and 10B are a front view and a perspective view of the transmission member, respectively. FIGS. 11A and 11B are partial front cross-sectional views of the multi-core writing instrument taken along the line BB of FIG. 1B when the first writing body is projected, and FIG. 2 is a partial front sectional view of the multi-core writing instrument taken along the line BB in FIG. 1B when the two writing bodies are projected. FIGS. 12A and 12B are a front view and a side view, respectively, of a multi-core writing instrument according to the second embodiment of the present invention. 13A and 13B are respectively a front cross-sectional view of the multi-core writing instrument taken along the line K1-K1 in FIG. 12B and a line taken along the line J1-J1 in FIG. 12A. It is a side sectional view of a lead-type writing instrument. FIGS. 14A to 14C are plan cross-sectional views of the multi-core writing instrument taken along lines L1-L1, M1-M1 and N1-N1 of FIG. 13B, respectively. 15A to 15C are a front view and a side view of the rear barrel, and a side cross-sectional view of the rear barrel taken along the line O1-O1 in FIG. 15A, respectively. 16A to 16D are a front view, a side view, a perspective view of the inner cylinder, and a side cross-sectional view of the inner cylinder along the line P1-P1 of FIG. 16A, respectively. FIG. 17 is an enlarged cross-sectional view of the insertion portion of the inner cylinder along the line Q1-Q1 in FIG. 18A to 18D are respectively a front view, a bottom view, a perspective view of the knock rod, and a cross-sectional view of the knock rod along the line R1-R1 of FIG. 18A. 19A to 19D are respectively a front view, a plan view, a perspective view of the rotor, and a cross-sectional view of the rotor taken along line S1-S1 of FIG. 19A. 20A to 20C are a front view, a right side view, and a perspective view of the second knock member, respectively. 21A to 21D are a front view, a side view, a perspective view and a bottom view of the spacer, respectively. 22(a) and 22(b) are partial front cross-sectional views of the multi-core writing instrument taken along the line K1-K1 in FIG. 12(b) when the first writing body is projected, respectively. FIG. 13 is a partial front cross-sectional view of the multi-core writing instrument taken along the line K1-K1 in FIG. 12B when the two writing bodies are protruding. 23A and 23B are a front view and a side view, respectively, of the multi-core writing instrument according to the third embodiment of the present invention. 24A and 24B are a front cross-sectional view of the multi-core writing instrument taken along line K2-K2 of FIG. 23B and a cross section taken along line J2-J2 of FIG. 23A, respectively. It is a side sectional view of a lead-type writing instrument. 25A to 25C are plan cross-sectional views of the multi-core writing instrument taken along line L2-L2, line M2-M2, and line N2-N2 of FIG. 24B, respectively. 26A to 26C are respectively a front view and a side view of the rear barrel, and a side cross-sectional view of the rear barrel along the line O2-O2 in FIG. 27A to 27D are respectively a front view, a side view, a perspective view of the inner cylinder, and a side cross-sectional view of the inner cylinder along the line P2-P2 in FIG. 27A. 28 is an enlarged cross-sectional view of the insertion portion of the inner cylinder taken along the line Q2-Q2 in FIG. 27(b). 29A to 29D are respectively a front view, a bottom view, a perspective view of the knock rod, and a cross-sectional view of the knock rod along the line R2-R2 in FIG. 29A. 30A to 30D are respectively a front view, a plan view, a perspective view of the rotor, and a cross-sectional view of the rotor taken along line S2-S2 of FIG. 30A. 31A to 31C are respectively a front view, a right side view and a perspective view of the second knock member. 32A to 32D are a front view, a side view, a perspective view and a bottom view of the spacer, respectively. 33(a) and 33(b) are partial side cross-sectional views of the multi-core writing instrument taken along the line J2-J2 of FIG. 23(a) when the first writing body is projecting, respectively. FIG. 24 is a partial side cross-sectional view of the multi-core writing instrument taken along the line J2-J2 of FIG. 23A when the two writing bodies are protruding.

Hereinafter, the multi-core writing instrument according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 11.

First, the configuration and operation of the multi-core writing instrument according to the first embodiment of the present invention will be briefly described with reference to FIGS. 1 to 3.

1A and 1B are respectively a front view and a side view of a multi-core writing instrument 1a according to the first embodiment of the present invention. 2A and 2B are a front cross-sectional view of the multi-core writing instrument 1a taken along the line BB of FIG. 1B and a line AA of FIG. 1A, respectively. It is a side surface sectional view of multi-core writing implement 1a. 3A to 3C are plan cross-sectional views of the multi-core writing instrument 1a taken along the lines CC, DD and EE of FIG. 2A, respectively.

The multi-core writing instrument 1a (hereinafter, simply referred to as "writing instrument 1a") includes a barrel 2a, a first writing body 3a and a second writing body 4a arranged in the barrel 2a, and a first writing body 3a. It comprises a first knock member 5a arranged at the rear end and a second knock member 6a arranged at the rear end of the second cursive body 4a. In addition, in this specification, the tip of the writing instrument 1a, that is, the pen tip side is defined as the "front" side of the writing instrument 1a, and the side opposite to the pen tip of the writing instrument 1a is along the axial direction (longitudinal direction) of the writing instrument 1a. It is defined as the "rear" side of 1a. Regarding the component parts of the writing instrument 1a, the pen tip side of the writing instrument 1a is defined as the "front" side of the component in the assembled state of the writing instrument 1a, and the pen tip of the writing instrument 1a is defined along the axial direction of the writing instrument 1a. The opposite side is defined as the "rear" side of the component.

In the present embodiment, the first writing body 3a is one ballpoint pen, and the second writing body 4a is two ballpoint pens. The first cursive body 3a is disposed inside the shaft cylinder 2a at the center of the shaft cylinder 2a in the radial direction, and the second cursive body 4a is located inside the shaft cylinder 2a on the radially outer side of the shaft cylinder 2a than the first cursive body 3a. It is arranged. The first writing body 3a and the second writing body 4a are located on the same straight line in the radial direction of the barrel 2a.

The first knock member 5a is configured to selectively project the first writing body 3a from the front end of the barrel 2a. The second knock member 6a is configured to selectively project the second writing body 4a from the front end of the barrel 2a. Specifically, when the first knock member 5a is operated, the first writing body 3a projects, and when the second knock member 6a is operated, the second writing body 4a projects. The pen tip of the second cursive body 4a moves radially inward along the inner surface of the barrel 2a and projects from the front end of the barrel 2a. As a result, writing can be performed by selectively using one of the three writing bodies.

The protrusion of the first cursive body 3a is released by operating the first knock member 5a or the second knock member 6a. The protrusion of the second writing body 4a is released by the operation of the first knock member 5a or the second knock member 6a of the writing body that does not project. Therefore, since the protrusion of the first writing body 3a and the second writing body 4a can be released by operating any one knock member, the operability of the writing instrument 1a is significantly improved. In addition, in this specification, releasing the protrusion of the writing body means that the pen tip of the writing body protruding from the front end of the barrel 2a is retracted into the barrel 2a.

Hereinafter, the components of the writing instrument 1a will be described in detail with reference to FIGS.

As shown in FIG. 1, the barrel 2a includes a front barrel 7a and a rear barrel 8a arranged rearward of the front barrel 7a. The front barrel 7a and the rear barrel 8a are connected by press fitting, bonding or screwing. For example, in the front barrel 7a and the rear barrel 8a, a female screw formed on the front inner peripheral surface of the rear barrel 8a is screwed with a male screw formed on the rear outer peripheral surface of the front barrel 7a. Are linked by doing.

4A to 4C are respectively a front view and a side view of the rear barrel 8a, and a front cross-sectional view of the rear barrel 8a taken along the line FF of FIG. 4B. Two sliding holes 81a are formed on the outer peripheral surface of the rear barrel 8a so that the second knock member 6a can slide in the axial direction. The sliding hole 81a extends in the axial direction. On the inner peripheral surface of the rear barrel 8a, there are formed four protrusions 82 that fit into a recess 183 of the spacer 18a and a recess 151 of the inner barrel 15a, which will be described later. As shown in FIGS. 3A and 4C, the convex portion 82 projects radially inward and extends substantially in the axial direction. A through hole 83 is formed at the rear end of the rear barrel 8a so that a knock rod described later can protrude from the rear barrel 8a.

As shown in FIG. 2A, the first writing body 3a includes a first ink storage tube 9a, a first joint 10a, and a first tip 11a, and the second writing body 4a includes a second ink storage tube 12a. , The second joint 13a and the second tip 14a. The first tip 11a is connected to the first ink containing tube 9a via the first joint 10a. The second tip 14a is connected to the second ink containing tube 12a via the second joint 13a.

The first ink containing tube 9a and the two second ink containing tubes 12a typically contain inks of different colors. By disposing the first knock member 5a behind the second knock member 6a, the length of the first ink containing tube 9a can be made longer than that of the second ink containing tube 12a. As a result, the ink filling amount of the first ink containing tube 9a can be made larger than the filling amount of the second ink containing tube 12a. Therefore, for example, by storing black ink, which is generally used frequently, in the first ink storage tube 9a, it is possible to extend the life of the writing instrument 1a or reduce the frequency of writing element replacement. Further, in order to obtain the same effect, the radial length of the first ink containing tube 9a is set so that the ink filling amount of the first ink containing tube 9a becomes larger than the filling amount of the second ink containing tube 12a. It may be longer than the second ink containing tube 12a.

The first knock member 5a includes an inner cylinder 15a fixed to the rear shaft cylinder 8a, a knock bar 16a arranged in the inner cylinder 15a and protruding rearward from the inner cylinder 15a, and arranged in front of the knock bar 16a. The rotor 17a is rotated. Although described later in detail, the first writing body 3a can be retracted from the front end of the barrel 2a by pressing the knock rod 16a and rotating the rotor 17a.

5(a) to 5(e) are a front view, a side view, a bottom view, a perspective view of the inner cylinder 15a, and a front cross-sectional view of the inner cylinder 15a taken along the line GG in FIG. Is. The inner cylinder 15a has a hollow, substantially cylindrical shape. Four concave portions 151 and two sliding grooves 152 extending in the longitudinal direction are formed on the outer peripheral surface of the inner cylinder 15a. The four concave portions 151 are fitted into the four convex portions 82 of the rear barrel 8a, respectively. As a result, the inner cylinder 15a is fixed to the inner peripheral surface of the shaft cylinder 2a. The bottom surface of the sliding groove 152 functions as a sliding surface 153 on which the second knock member 6a slides back and forth. Further, as shown in FIG. 5B, the sliding groove 152 has a front end engaged with the rear end of the second knock member 6a when the second writing body 4a projects from the barrel 2a. The surface 154 is formed.

Four outer cams 155a are formed on the inner peripheral surface of the inner cylinder 15a. The four outer cams 155a are arranged at equal intervals in the circumferential direction. Four grooves 156 extending in the axial direction are formed between the adjacent outer cams 155a. Each outer cam 155a is composed of three rod-shaped portions extending in the axial direction and continuously formed in the circumferential direction. The second rod-shaped portion 158 arranged in the center has a smaller radial thickness than the first rod-shaped portion 157 and the third rod-shaped portion 159 at both ends. As a result, the accommodation recess 251 is formed between the first rod-shaped portion 157 and the third rod-shaped portion 159, that is, on the second rod-shaped portion 158. The groove 156 and the accommodating recess 251 accommodate a protrusion of a knock rod 16a described later. Further, the groove 156 accommodates an inner cam 179a of the rotor 17a, which will be described later, when the first writing body 3a is in the retracted state. The inner cylinder 15a may be integrated with the rear shaft cylinder 8a.

6A to 6D are respectively a front view, a bottom view, a perspective view of the knock rod 16a, and a cross-sectional view of the knock rod 16a taken along the line HH of FIG. 6A. The knock rod 16a has a hollow and substantially cylindrical shape. Six recesses 161 extending in the axial direction are formed on the outer peripheral surface of the knock bar 16a mainly for improving the design of the writing instrument 1a. The user of the writing instrument 1a can operate the first knock member 5a by pressing the rear end of the knock rod 16a with a finger.

The knock rod 16a has eight projections 162a on the outer peripheral surface, which project outward in the radial direction and extend in the axial direction. The eight protrusions 162a are arranged at equal intervals in the circumferential direction. When the knock rod 16a moves in the axial direction, the protrusions 162a are provided inside the outer cam 155a of the inner cylinder 15a, more specifically, inside the accommodation recess 251 between the first rod-shaped portion 157 and the third rod-shaped portion 159, Alternatively, it is configured to slide in the groove 156 between the outer cams 155a in the front-rear direction. That is, the knock rod 16a and the inner cylinder 15a are configured to restrict the rotation of the knock rod 16a in the circumferential direction. A cam surface 163a is formed on the front end of the knock rod 16a over the entire circumference. The cam surface 163a is composed of a plurality of slopes.

7A to 7D are respectively a front view, a plan view, a perspective view of the rotor 17a, and a cross-sectional view of the rotor 17a taken along the line I-I of FIG. 7A. The rotor 17a has a hollow and substantially cylindrical shape, and has an insertion portion 171a inserted into the knock rod 16a, a first cam receiving portion 172 arranged in front of the insertion portion 171a, and a first cam receiving portion. And a second cam receiving portion 173 arranged in front of 172. The knock bar 16a and the rotor 17a are configured to move in the axial direction within the inner cylinder 15a.

As shown in FIG. 2, the first ink containing tube 9a is inserted into the second cam receiving portion 173 and the first cam receiving portion 172. As shown in FIG. 7D, a fitting protrusion 174 that fits with the first ink containing tube 9a is formed on the inner peripheral surface of the first cam receiving portion 172. The fitting protrusion 174 projects inward in the radial direction and extends over the entire circumference in the circumferential direction. A contact surface 175 with which the rear end of the first ink containing tube 9a abuts is formed inside the first cam receiving portion 172. Further, a ventilation hole 176a for ensuring ventilation of the first ink containing tube 9a extends in the axial direction from the contact surface 175 to the rear end of the rotor 17a. The diameter of the vent hole 176a gradually decreases from the contact surface 175 toward the rear end. A biasing surface 177 with which a rear end of a first spring 21a described later abuts is formed inside the second cam receiving portion 173.

A first cam receiving surface 178 that interacts with the cam surface 163a of the knock rod 16a is formed at the rear end of the outer peripheral surface of the first cam receiving portion 172 over the entire circumference. The first cam receiving surface 178 is composed of a plurality of slopes similarly to the cam surface 163a. The cam surface 163a and the first cam receiving surface 178 are configured so that the first cam receiving surface 178 receives a force in the axial direction and the circumferential direction from the cam surface 163a when the knock rod 16a moves forward. Therefore, when the cam surface 163a presses the first cam receiving surface 178 by the forward movement of the knock rod 16a, the rotor 17a rotates in the circumferential direction by the circumferential force. On the other hand, the knock rod 16a is restricted from rotating in the circumferential direction because the protrusion 162a contacts the first rod-shaped portion 157 or the third rod-shaped portion 159 of the outer cam 155a of the inner cylinder 15a.

On the outer peripheral surface of the first cam receiving portion 172, four inner cams 179a and a groove 271a extending in the axial direction are formed. The four inner cams 179a are arranged at equal intervals in the circumferential direction. The front end of the inner cam 179a constitutes a part of the first cam receiving surface 178. The inner cam 179a axially engages or disengages with the outer cam 155a of the inner cylinder 15a when the rotor 17a rotates in the circumferential direction due to the forward movement of the knock rod 16a, so that the inner cam 179a is inserted into the groove 156 between the outer cams 155a. Housed in. When the inner cam 179a is housed in the groove 156 between the outer cams 155a, the outer cam 155a is housed in the groove 271a between the inner cams 179a. That is, the inner cylinder 15a and the rotor 17a are configured such that when the rotor 17a rotates in the circumferential direction by the forward movement of the knock rod 16a, the inner cylinder 15a and the rotor 17a engage with each other in the axial direction or release the engagement.

On the outer peripheral surface of the second cam receiving portion 173, four cam protrusions 272 that project radially outward and extend in the axial direction are formed. The four cam protrusions 272 are arranged at equal intervals in the circumferential direction. A second cam receiving surface 273 that interacts with a cam surface 66a of the second knock member 6a described later is formed at the rear end of the cam protrusion 272. As can be seen from FIG. 7A, the circumferential position of the cam protrusion 272 is equal to that of the inner cam 179a. The cam protrusion 272 has the same shape as the inner cam 179a.

The outer peripheral surface between the first cam receiving portion 172 and the second cam receiving portion 173 contacts the rear end of the second knock member 6a when the protrusion of the second writing body 4a is released by the first knock member 5a. The pressing surface 274 is formed over the entire circumference. The rear end of the second knock member 6a and the pressing surface 274 are configured to receive a force in the axial direction and a force in the radial direction when they come into contact with each other.

8A to 8C are a front view, a side view, and a perspective view of the second knock member 6a, respectively. The second knock member 6a has an elongated shape. The two second knock members 6a have the same shape. As a result, the parts can be shared, and the cost of the writing instrument 1a can be reduced.

The second knock member 6a has a main body portion 61a extending in the front-rear direction, a fitting portion 62a formed in front of the main body portion 61a, and an operation portion 63a formed in the rear portion of the main body portion 61a. As shown in FIG. 2A, the fitting portion 62a fits with the second ink containing tube 12a. As a result, the second ink containing tube 12a is fixed to the second knock member 6a. The body portion 61a is formed with a biasing surface 64a against which a second spring 22a described later abuts. As shown in FIG. 1A, since the operating portion 63a projects radially outward from the barrel 2a in the assembled state of the writing instrument 1a, it can be operated with a finger.

A pressing protrusion 65a is formed on the bottom surface of the main body 61a. As shown in FIG. 2A, the pressing protrusion 65a projects inward in the radial direction of the barrel 2a in the assembled state of the writing instrument 1a. A cam surface 66a that interacts with the second cam receiving surface 273 of the rotor 17a is formed at the front end of the pressing protrusion 65a. The cam surface 66a and the second cam receiving surface 273 are configured such that when the second knock member 6a moves forward, the second cam receiving surface 273 receives a force in the axial direction and the circumferential direction from the cam surface 66a. Therefore, when the cam surface 66a presses the second cam receiving surface 273 as the second knock member 6a advances, the rotor 17a rotates in the circumferential direction by the circumferential force. On the other hand, the second knock member 6a is restricted from rotating in the circumferential direction because the operating portion 63a contacts the side wall of the sliding hole 81a of the rear barrel 8a.

The writing instrument 1a further includes a spacer 18a fixed to the barrel 2a, a pipe member 19a and a transmission member 20 fixed to the spacer 18a, a first spring 21a, and two second springs 22a.

9A and 9B are perspective views of the spacer 18a, respectively. The spacer 18a has a columnar portion 181 formed on the front side and four fitting portions 182 extending rearward from the columnar portion 181. Each fitting portion 182 is formed with a recess 183 extending in the longitudinal direction. The recesses 183 are fitted into the protrusions 82 of the rear barrel 8a. As a result, the spacer 18a is fixed to the inner peripheral surface of the rear barrel 8a.

The columnar portion 181 has a columnar shape, and four through holes are formed in the columnar portion 181. A first through hole 184a is formed at the center of the columnar part 181, and two second through holes 185a and a third through hole 186 are formed along the circumferential direction of the columnar part 181 so as to surround the first through hole 184a. It The first through hole 184a and the two second through holes 185a are located on the same straight line in the radial direction. The rear surface of the cylindrical portion 181 supports the second spring 22a.

The pipe member 19a has a hollow cylindrical shape. The front portion of the pipe member 19a is press fitted into the first through hole 184a of the spacer 18a. As a result, the pipe member 19a is fixed to the spacer 18a. The pipe member 19a may be fixed to the spacer 18a by adhesion. As shown in FIG. 2, the rear end of the pipe member 19a supports the first spring 21a.

The first ink containing tube 9a extends through the first through hole 184a of the spacer 18a and the pipe member 19a, and is fixed to the rotor 17a. The second ink containing tube 12a extends through the second through hole 185a of the spacer 18a and is fixed to the second knock member 6a.

The first spring 21a is arranged so as to surround the first ink containing tube 9a in the circumferential direction between the rear end of the pipe member 19a and the urging surface 177 of the rotor 17a, and thus the rotor 17a and the first cursive body. Energize 3a rearward. The second spring 22a is disposed between the rear end of the columnar portion 181 of the spacer 18a and the urging surface 64a of the second knock member 6a so as to surround the second ink containing tube 12a in the circumferential direction, and the second knock 22a is provided. The member 6a and thus the second cursive body 4a are biased rearward.

10A and 10B are a front view and a perspective view of the transmission member 20, respectively. The transmission member 20 has an elongated shape and includes a mounting portion 201, a contact portion 202, a connecting portion 203, and a contact portion 204 from the rear end toward the front end. The mounting portion 201 has a cylindrical shape and is press-fitted into the third through hole 186 of the spacer 18a. As a result, the transmission member 20 is fixed to the spacer 18a. The transmission member 20 may be fixed to the spacer 18a by adhesion. The contact part 202 has a rectangular parallelepiped shape, and contacts the column part 181 of the spacer 18a when the transmission member 20 is fixed to the spacer 18a. The connection portion 203 has a cylindrical shape and connects the contact portion 202 and the contact portion 204.

As shown in FIG. 3A, the contact portion 204 is configured to partially surround the first writing body 3a in the circumferential direction in the assembled state of the writing instrument 1a. This can prevent the transmission member 20 from occupying a large space in the barrel 2a. When the writing instrument includes four second writing bodies and a second knock member, the contact portion may be configured to surround the first writing body in the entire circumferential direction. The contact surface 205 of the contact portion 204 that comes into contact with the cam surface 66a of the second knock member 6a is configured to receive an axial force and a radial force from the cam surface 66a at the time of contact. Therefore, when the cam surface 66a contacts the contact surface 205, the contact portion 204 is pressed inward in the radial direction by the radial force.

Hereinafter, the principle that the first writing body 3a and the second writing body 4a project from the front end of the barrel 2a, and the projection of the first writing body 3a and the second writing body 4a are the first knock member 5a or the second knock member 6a. The principle and the principle to be released by will be described in detail.

11A and 11B are partial front cross-sectional views of the multi-core writing instrument 1a taken along the line BB of FIG. 1B when the first writing body 3a is projected, respectively. 2 is a partial front cross-sectional view of the multi-core writing instrument 1a taken along the line BB of FIG. 1B when the second writing body 4a of FIG.

First, the principle that the first writing body 3a projects from the front end of the barrel 2a will be described.

In the retracted state, the inner cam 179a of the rotor 17a is housed in the groove 156 between the outer cams 155a of the inner cylinder 15a. When the knock rod 16a is moved forward against the biasing force of the first spring 21a from this state, the cam surface 163a of the knock rod 16a abuts on the first cam receiving surface 178 of the rotor 17a, and the rotor 17a moves. Move forward with 16a. At this time, the knock bar 16a and the rotor 17a receive the axial force and the circumferential force from each other via the cam surface 163a and the first cam receiving surface 178. After that, when the rear end of the inner cam 179a exceeds the front end of the first rod-shaped portion 157 of the outer cam 155a, the regulation of the rotor 17a in the circumferential direction is released. Rotate counterclockwise when viewed from the front). On the other hand, the knock rod 16a does not rotate in the circumferential direction because the projection 162a abuts the first rod-shaped portion 157 or the third rod-shaped portion 159 of the outer cam 155a to restrict the rotation in the circumferential direction.

When the knock rod 16a is released in this state, the knock rod 16a and the rotor 17a retreat by the urging force of the first spring 21a. At this time, the rear end of the inner cam 179a of the rotor 17a rotated in the circumferential direction axially engages with the front end of the second rod-shaped portion 158 of the outer cam 155a of the inner cylinder 15a, and the third rod-shaped portion 159 and the circumferential direction. Engage with. This engagement prevents the rotor 17a from retreating, so that the first writing body 3a fixed to the rotor 17a is maintained in a protruding state from the front end of the barrel 2a.

Hereinafter, the principle that the protrusion of the first writing body 3a is released by the first knock member 5a will be described.

In the protruding state, the inner cam 179a of the rotor 17a engages with the outer cam 155a of the inner cylinder 15a in the axial direction. When the knock rod 16a is moved forward against the biasing force of the first spring 21a from this state, the cam surface 163a of the knock rod 16a abuts on the first cam receiving surface 178 of the rotor 17a, and the rotor 17a moves. Move forward with 16a. At this time, the knock bar 16a and the rotor 17a receive the axial force and the circumferential force from each other via the cam surface 163a and the first cam receiving surface 178. After that, when the rear end of the inner cam 179a exceeds the front end of the third rod-shaped portion 159 of the outer cam 155a, the regulation of the rotor 17a in the circumferential direction is released, so that the rotor 17a is circumferentially moved by the circumferential force ( Rotate counterclockwise when viewed from the front). On the other hand, the knock rod 16a does not rotate in the circumferential direction because the projection 162a abuts the first rod-shaped portion 157 or the third rod-shaped portion 159 of the outer cam 155a to restrict the rotation in the circumferential direction.

When the knock rod 16a is released in this state, the knock rod 16a and the rotor 17a retract by the urging force of the first spring 21a, and the circumferentially rotated inner cam 179a is housed in the groove 156 between the outer cams 155a. .. At this time, the first writing body 3a fixed to the rotor 17a also retracts, so that the protrusion of the first writing body 3a is released.

Hereinafter, the principle that the protrusion of the first writing body 3a is released by the second knock member 6a will be described.

In the protruding state, the inner cam 179a of the rotor 17a engages with the outer cam 155a of the inner cylinder 15a in the axial direction. At this time, as shown in FIG. 11A, the pressing protrusion 65a of the second knock member 6a is located rearward of the cam protrusion 272 of the rotor 17a, and the circumferential position of two of the four cam protrusions 272 is large. Is equal to the pressing protrusion 65a.

When the second knock member 6a is moved forward against the biasing force of the second spring 22a from this state, the cam surface 66a of the second knock member 6a abuts the second cam receiving surface 273 of the rotor 17a, and the rotor 17a advances together with the second knock member 6a. At this time, the second knock member 6a and the rotor 17a receive forces in the axial direction and the circumferential direction, respectively, via the cam surface 66a and the second cam receiving surface 273. After that, when the rear end of the inner cam 179a exceeds the front end of the third rod-shaped portion 159 of the outer cam 155a, the regulation of the rotor 17a in the circumferential direction is released, so that the rotor 17a is circumferentially moved by the circumferential force ( Rotate counterclockwise when viewed from the front). On the other hand, the second knock member 6a does not rotate in the circumferential direction because the operation portion 63a abuts the side wall of the sliding hole 81a of the rear barrel 8a to restrict the rotation in the circumferential direction. The inner cam 179a rotated in the circumferential direction is housed in the groove 156 between the outer cams 155a by the urging force of the first spring 21a. At this time, since the rotor 17a and the knock bar 16a retract, the first writing body 3a fixed to the rotor 17a also retracts, and the protrusion of the first writing body 3a is released.

The principle of the second cursive body 4a protruding from the front end of the barrel 2a will be described below.

In the retracted state, the operating portion 63a of the second knock member 6a is located on the sliding surface 153 of the inner cylinder 15a. From this state, the second knock member 6a is moved forward against the biasing force of the second spring 22a. After that, when the rear end of the second knock member 6a exceeds the front end of the sliding surface 153 of the inner cylinder 15a, the operating portion 63a of the second knock member 6a falls radially inward.

When the second knock member 6a is released in this state, as shown in FIG. 11B, the rear end of the second knock member 6a is urged by the urging force of the second spring 22a to engage with the engaging surface 154 of the inner cylinder 15a and the axis line. Engage in the direction. This engagement prevents the second knock member 6a from retracting, so that the second writing body 4a fixed to the second knock member 6a projects from the front end of the barrel 2a.

Hereinafter, the principle that the protrusion of the second writing body 4a is released by the first knock member 5a will be described.

In the protruding state, the second knock member 6a engages with the inner cylinder 15a in the axial direction. At this time, as shown in FIG. 11B, the pressing surface 274 of the rotor 17a is located rearward of the rear end of the second knock member 6a.

When the knock rod 16a is moved forward against the biasing force of the first spring 21a from this state, the cam surface 163a of the knock rod 16a abuts on the first cam receiving surface 178 of the rotor 17a, and the rotor 17a moves. Move forward with 16a. After that, when the pressing surface 274 of the rotor 17a comes into contact with the rear end of the second knock member 6a, the rear end of the second knock member 6a receives a force radially outward from the pressing surface 274, so that the inner cylinder 15a The engagement is released. After that, the second knock member 6a is retracted by the urging force of the second spring 22a, so that the second writing body 4a fixed to the second knock member 6a is also retracted, and the protrusion of the second writing body 4a is released. ..

Hereinafter, the principle that the projection of the second cursive body 4a is released by the second knock member 6a will be described.

In the protruding state, the second knock member 6a engages with the inner cylinder 15a in the axial direction. At this time, as shown in FIG. 11B, the pressing protrusion 65 a of the second knock member 6 a of the second writing body 4 a, which does not project, is positioned rearward of the contact surface 205 of the transmission member 20.

When the second knock member 6a of the second writing body 4a that does not project is advanced from this state against the biasing force of the second spring 22a, the cam surface 66a of the second knock member 6a causes the contact surface of the transmission member 20 to contact. Contact 205. At this time, since the contact surface 205 receives a force inward in the radial direction from the cam surface 66a, the contact portion 204 moves in the radial direction, and the second knock member 6a of the second cursive body 4a protruding on the opposite side is moved in the radial direction. Press outward. As a result, the engagement between the rear end of the second knock member 6a and the inner cylinder 15a is released. After that, the second knock member 6a is retracted by the urging force of the second spring 22a, so that the second writing body 4a fixed to the second knock member 6a is also retracted, and the protrusion of the second writing body 4a is released. ..

Hereinafter, the multi-core writing instrument according to the second embodiment of the present invention will be described with reference to FIGS. 12 to 22.

First, the configuration and operation of the multi-core writing instrument according to the second embodiment of the present invention will be briefly described with reference to FIGS. 12 to 14.

12A and 12B are a front view and a side view, respectively, of a multi-core writing instrument 1b according to the second embodiment of the present invention. FIGS. 13A and 13B are front cross-sectional views of the multi-core writing instrument 1b taken along line K1-K1 in FIG. 12B and lines J1-J1 in FIG. 12A, respectively. It is a side surface sectional view of multi-core writing implement 1b. 14A to 14C are plan cross-sectional views of the multi-core writing instrument 1b taken along lines L1-L1, M1-M1 and N1-N1 of FIG. 13B, respectively.

The multi-core writing instrument 1b (hereinafter, simply referred to as "writing instrument 1b") includes a barrel 2b, a first writing body 3b and a second writing body 4b arranged in the barrel 2b, and a first writing body 3b. It has a first knock member 5b arranged at the rear end and a second knock member 6b arranged at the rear end of the second cursive body 4b. In the present specification, the tip of the writing instrument 1b, that is, the pen tip side is defined as the "front" side of the writing instrument 1b, and the side opposite to the pen tip of the writing instrument 1b along the axial direction (longitudinal direction) of the writing instrument 1b. Defined as the "rear" side of 1b. Also, regarding the component parts of the writing instrument 1b, the pen tip side of the writing instrument 1b is defined as the "front" side of the component in the assembled state of the writing instrument 1b, and the pen tip of the writing instrument 1b is defined along the axial direction of the writing instrument 1b. The opposite side is defined as the "rear" side of the component.

In the present embodiment, the first writing body 3b is one ballpoint pen, and the second writing body 4b is two ballpoint pens. The first writing body 3b is disposed inside the shaft cylinder 2b at the radial center of the shaft cylinder 2b. It is arranged. The first writing body 3b and the second writing body 4b are located on the same straight line in the radial direction of the barrel 2b.

The first knock member 5b is configured to selectively project the first writing body 3b from the front end of the barrel 2b. The second knock member 6b is configured to selectively project the second writing body 4b from the front end of the barrel 2b. Specifically, when the first knock member 5b is operated, the first writing body 3b projects, and when the second knock member 6b is operated, the second writing body 4b projects. The pen tip of the second cursive body 4b moves radially inward along the inner surface of the barrel 2b and projects from the front end of the barrel 2b. As a result, writing can be performed by selectively using one of the three writing bodies.

The protrusion of the first cursive body 3b is released by operating the first knock member 5b or the second knock member 6b. The protrusion of the second writing body 4b is released by the operation of the first knock member 5b or the second knock member 6b of the writing body that does not protrude. Therefore, the protrusions of the first writing body 3b and the second writing body 4b can be released by operating any one knock member, so that the operability of the writing instrument 1b is significantly improved.

Hereinafter, the components of the writing instrument 1b will be described in detail with reference to FIGS.

As shown in FIG. 12, the shaft cylinder 2b includes a front shaft cylinder 7b and a rear shaft cylinder 8b arranged rearward of the front shaft cylinder 7b. The front barrel 7b and the rear barrel 8b are connected via a spacer 18b described later. The front barrel 7b and the rear barrel 8b may be directly connected by press fitting or the like as in the first embodiment.

15A to 15C are respectively a front view and a side view of the rear barrel 8b, and a side cross-sectional view of the rear barrel 8b taken along the line OO of FIG. 15A. Two sliding holes 81b are formed on the outer peripheral surface of the rear barrel 8b so that the second knock member 6b can slide in the axial direction. The sliding hole 81b extends in the axial direction. A fitting hole 84b and a fitting groove 85b for fitting with an inner cylinder 15b described later are formed at the rear end of the rear barrel 8b.

As shown in FIG. 13A, the first writing body 3b includes a first ink storage tube 9b, a first joint 10b, and a first tip 11b, and the second writing body 4b includes a second ink storage tube 12b. , The second joint 13b and the second tip 14b. The first tip 11b is connected to the first ink containing tube 9b via the first joint 10b. The second tip 14b is connected to the second ink containing tube 12b via the second joint 13b.

The first ink containing tube 9b and the two second ink containing tubes 12b typically contain inks of different colors. By disposing the first knock member 5b behind the second knock member 6b, the length of the first ink containing tube 9b can be made longer than that of the second ink containing tube 12b. As a result, the ink filling amount of the first ink containing pipe 9b can be made larger than the filling amount of the second ink containing pipe 12b. Therefore, for example, by storing black ink, which is generally used frequently, in the first ink storage tube 9b, it is possible to extend the life of the writing instrument 1b or reduce the frequency of writing element replacement. Further, in order to obtain the same effect, the radial length of the first ink containing tube 9b is set so that the ink filling amount of the first ink containing tube 9b becomes larger than the filling amount of the second ink containing tube 12b. It may be longer than the second ink containing tube 12b.

The first knock member 5b includes an inner cylinder 15b fixed to the rear shaft cylinder 8b, a knock bar 16b arranged in the inner cylinder 15b and protruding rearward from the inner cylinder 15b, and arranged in front of the knock bar 16b. Rotor 17b that has been rotated. Although described in detail later, by pressing the knock bar 16b and rotating the rotor 17b, the first writing body 3b can be retracted from the front end of the barrel 2b.

16A to 16D are respectively a front view, a side view, a perspective view of the inner cylinder 15b, and a side sectional view of the inner cylinder 15b taken along line P1-P1 of FIG. 16A. The inner cylinder 15b has a clip portion 252b and an insertion portion 253b. The clip portion 252b has an elongated shape, and when the inner cylinder 15b is fixed to the shaft cylinder 2b, it extends substantially in the axial direction outside the shaft cylinder 2b. A ball portion 254b protruding inward in the radial direction of the barrel 2b is provided on the front portion of the clip portion 252b. A fitting portion 255b that fits into the fitting groove 85b of the rear barrel 8b is provided at the base of the clip portion 252b.

The insertion portion 253b has a hollow, substantially cylindrical shape. The rear portion of the insertion portion 253b is exposed from the shaft cylinder 2b when the inner cylinder 15b is fixed to the shaft cylinder 2b. A through hole 256b extending in the axial direction is formed in the rear portion of the insertion portion 253b, and the knock rod 16b projects rearward from the inner cylinder 15b through the through hole 256b.

On the outer peripheral surface of the insertion portion 253b, four rails 257b that fit into the fitting holes 84b of the rear barrel 8b and two reinforcing members 258 that reinforce the insertion portion 253b are provided. The rail 257b projects radially outward from the outer peripheral surface of the insertion portion 253b and extends in the axial direction from the rear portion to the front end of the insertion portion 253b. The reinforcing member 258 projects radially outward from the outer peripheral surface of the insertion portion 253b and partially extends in the axial direction from the rear portion of the insertion portion 253b. The length of the reinforcing member 258 in the axial direction is shorter than that of the rail 257b.

The insertion portion 253b is formed with two sliding holes 259b extending in the axial direction from the rear portion to the front end so that the second knock member 6b can slide in the axial direction. When the inner cylinder 15b is fixed to the shaft cylinder 2b, the circumferential position of the sliding hole 259b of the inner cylinder 15b is equal to the sliding hole 81b of the shaft cylinder 2b. When the second knock member 6b receives a force in the circumferential direction, the second knock member 6b comes into contact with the rail 257b forming the side wall of the sliding hole 259b.

FIG. 17 is an enlarged cross-sectional view of the insertion portion 253b of the inner cylinder 15b taken along the line QQ of FIG. 16(b). The insertion portion 253b has two outer cams 155b on the inner peripheral surface. The two outer cams 155b are circumferentially separated from each other and are located on the same straight line in the radial direction. The insertion portion 253b further has two thick portions 351b on the inner peripheral surface. The two thick portions 351b are circumferentially separated from each other and are located on the same straight line in the radial direction. The outer cams 155b and the thick portions 351b are spaced apart in the circumferential direction and are alternately arranged. The outer cam 155b and the thick portion 351b have the same radial thickness. As a result, two first recesses 352 and two second recesses 353 are formed between the outer cam 155b and the thick portion 351b.

The circumferential length of the second recess 353 is longer than that of the first recess 352. In addition, the second recess 353 communicates with the sliding hole 259b. The first recess 352 and the second recess 353 accommodate a protrusion 162b of a knock rod 16b, which will be described later. In addition, as shown in FIG. 14A, the first recess 352 and the second recess 353 accommodate an inner cam 179b of the rotor 17b, which will be described later, when the first writing body 3b is in the retracted state.

The inner cylinder 15b may be integrated with the rear shaft cylinder 8b. Further, the inner cylinder 15b may not have the clip portion 252b as in the first embodiment.

18A to 18D are respectively a front view, a bottom view, a perspective view of the knock rod 16b, and a cross-sectional view of the knock rod 16b taken along line R1-R1 of FIG. 18A. The knock rod 16b has a substantially columnar shape. An accommodation space 164b for partially accommodating the rotor 17b is formed in the front portion of the knock rod 16b. The user of the writing instrument 1b can operate the first knock member 5b by pressing the rear end of the knock rod 16b with a finger.

The knock bar 16b has four projections 162b on the outer peripheral surface thereof, which project outward in the radial direction and extend in the axial direction. The four protrusions 162b are arranged at equal intervals in the circumferential direction. Each protrusion 162b is configured to slide in the first recess 352 or the second recess 353 of the inner cylinder 15b in the axial direction when the knock rod 16b moves in the axial direction. That is, the knock rod 16b and the inner cylinder 15b are configured to restrict the rotation of the knock rod 16b in the circumferential direction. Further, a cam surface 163b is formed on the front end of the knock rod 16b over the entire circumference. The cam surface 163b is composed of a plurality of slopes.

19A to 19D are respectively a front view, a plan view, a perspective view of the rotor 17b, and a cross-sectional view of the rotor 17b taken along line S1-S1 of FIG. 19A. The rotor 17b has a hollow substantially cylindrical shape, and has an insertion portion 171b inserted into the accommodation space 164b of the knock rod 16b and a cam receiving portion 275b arranged in front of the insertion portion 171b. The knock bar 16b and the rotor 17b are configured to move in the axial direction within the inner cylinder 15b.

As shown in FIG. 13, the first ink containing tube 9b is press-fitted into the cam receiving portion 275b. As a result, the first ink containing tube 9b is fixed to the rotor 17b. A first contact surface 276b with which the rear end of the first ink containing tube 9b abuts is formed inside the cam receiving portion 275b. Further, a ventilation hole 176b for ensuring ventilation of the first ink containing tube 9b extends in the axial direction from the first contact surface 276b to the rear end of the rotor 17b. Further, as shown in FIG. 13, a pipe member 19b described later is also press-fitted into the cam receiving portion 275b. As a result, the pipe member 19b is fixed to the rotor 17b. A second contact surface 277b with which the rear end of the pipe member 19b abuts is formed inside the cam receiving portion 275b.

Four inner cams 179b and a groove 271b extending in the axial direction are formed on the outer peripheral surface of the cam receiving portion 275b. The four inner cams 179b are arranged at equal intervals in the circumferential direction. At the front end of the inner cam 179b, a cam receiving surface 278b that interacts with the cam surface 163b of the knock rod 16b is formed. The cam surface 163b and the cam receiving surface 278b are configured so that the cam receiving surface 278b receives axial and circumferential forces from the cam surface 163b when the knock rod 16b advances. Therefore, when the cam surface 163b presses the cam receiving surface 278b as the knock rod 16b advances, the rotor 17b rotates in the circumferential direction by the circumferential force. On the other hand, the knock rod 16b is restricted from rotating in the circumferential direction because the protrusion 162b contacts the outer cam 155b of the inner cylinder 15b or the thick portion 351b.

When the inner cam 179b is housed in the first recess 352 or the second recess 353 of the inner cylinder 15b as shown in FIG. 14(a), the rotor 17b is rotated in the circumferential direction by the forward movement of the knock rod 16b. Then, it engages with the thick portion 351b of the inner cylinder 15b in the axial direction. Further, when the inner cam 179b is engaged with the thick portion 351b in the axial direction, when the rotor 17b rotates in the circumferential direction by the forward movement of the knock rod 16b, the inner cam 179b receives a further circumferential force from the outer cam 155b. As a result, the engagement with the thick portion 351b is released, and the thick portion 351b is accommodated in the first recess 352 or the second recess 353. When the inner cam 179b is housed in the first recess 352 or the second recess 353, the outer cam 155b and the thick portion 351b are housed in the groove 271b between the inner cams 179b. That is, the inner cylinder 15b and the rotor 17b are configured such that when the rotor 17b is rotated in the circumferential direction by the forward movement of the knock rod 16b, the inner cylinder 15b and the rotor 17b are engaged with each other or released from the engagement in the axial direction.

20A to 20C are a front view, a right side view and a perspective view of the second knock member 6b, respectively. The second knock member 6b has an elongated shape. The two second knock members 6b have the same shape. As a result, the parts can be shared, and the cost of the writing instrument 1b can be reduced.

The second knock member 6b includes a body portion 61b extending in the front-rear direction, a fitting portion 62b formed in front of the body portion 61b, an operation portion 63b formed in the rear portion of the body portion 61b, and a body portion 61b. And contact portions 67b formed on both sides of the. As shown in FIG. 13A, the fitting portion 62b fits with the second ink containing tube 12b. As a result, the second ink containing tube 12b is fixed to the second knock member 6b. As shown in FIG. 12A, since the operating portion 63b projects radially outward from the barrel 2b in the assembled state of the writing instrument 1b, it can be operated with a finger.

A biasing surface 64b is formed on the main body portion 61b against which a second spring 22b described later abuts. In addition, a first contact surface 68b that is pressed by the front surface of the rotor 17b when the protrusion of the second knock member 6b is released by operating the first knock member 5b is formed at the rear end of the body portion 61b. The first contact surface 68b is configured to receive an axial force and a radial force from the front surface of the rotor 17b during contact.

A pressing protrusion 65b is formed on the bottom surface of the main body 61b. As shown in FIG. 13A, the pressing protrusion 65b projects inward in the radial direction of the barrel 2b and extends in the axial direction in the assembled state of the writing instrument 1b. A cam surface 66b that interacts with the cam receiving surface 278b of the rotor 17b is formed at the front end of the pressing protrusion 65b. The cam surface 66b and the cam receiving surface 278b are configured so that the cam receiving surface 278b receives axial and circumferential forces from the cam surface 66b when the second knock member 6b advances. Therefore, when the cam surface 66b presses the cam receiving surface 278b as the second knock member 6b advances, the rotor 17b rotates in the circumferential direction by the circumferential force. On the other hand, the second knock member 6b is restricted from rotating in the circumferential direction because the operating portion 63b contacts the rail 257b of the inner cylinder 15b.

As shown in FIG. 14A, in the assembled state of the writing instrument 1b, the contact portion 67b extends substantially in the circumferential direction of the barrel 2b, and the contact portions 67b of the two second knock members 6b are adjacent to each other in the circumferential direction. To do. In other words, the main body portion 61b and the contact portion 67b of each second knock member 6b extend within a range of about 180° of the entire circumference (360°) of the barrel 2b.

At the front end of the contact portion 67b, when the protrusion of the second writing body 4b is released by the operation of the second knock member 6b of the second writing body 4b that does not project, the second knocking of the second writing body 4b that is protruding. Two pressing surfaces 69b that press the member 6b are formed. At the rear end of the contact portion 67b, when the protrusion of the second cursive body 4b is released by operating the second knock member 6b of the non-protruding second cursive body 4b, Two second contact surfaces 70b pressed by the knock member 6b are formed. The pressing surface 69b and the second contact surface 70b are configured to receive an axial force and a radial force with respect to each other at the time of contact.

The writing instrument 1b further includes a pipe member 19b press-fitted into the rotor 17b, a first spring 21b, a second spring 22b, and a spacer 18b that supports the first spring 21b and the second spring 22b.

The pipe member 19b has a hollow cylindrical shape. The front portion of the pipe member 19b is press-fitted into the rotor 17b. As a result, the pipe member 19b is fixed to the rotor 17b. The pipe member 19b may be fixed to the rotor 17b by adhesion. As shown in FIG. 13, the front end of the pipe member 19b is biased by the first spring 21b.

21A to 21D are a front view, a side view, a perspective view and a bottom view of the spacer 18b, respectively. The spacer 18b is formed between the first press-fitting portion 187b press-fitted into the front barrel 7b, the second press-fitting portion 188b press-fitted into the rear barrel 8b, and the first press-fitting portion 187b and the second press-fitting portion 188b. The exposed portion 189b and the three spring guides (first spring guide 281b and second spring guide 282b) extending rearward from the second press-fitting portion 188b are included. The first press-fitting portion 187b and the second press-fitting portion 188b may be fixed to the front barrel 7b and the rear barrel 8b by bonding or screwing, respectively.

The first press-fitting portion 187b has a hollow, substantially cylindrical shape, and the second press-fitting portion 188b has a substantially cylindrical shape. The rear surface of the second press-fitting portion 188b supports the first spring 21b and the second spring 22b. The exposed portion 189b has the same diameter as the shaft cylinder 2b, and as shown in FIG. 12, constitutes an outer peripheral surface of the writing instrument 1b together with the front shaft cylinder 7b and the rear shaft cylinder 8b.

Three through holes are formed in the exposed portion 189b and the second press-fitting portion 188b. A first through hole 184b is formed at the center in the radial direction, and two second through holes 185b are formed radially outside the first through hole 184b. The first through hole 184b and the two second through holes 185b are located on the same straight line in the radial direction. The first spring guide 281b is formed to partially surround the first through hole 184b in the circumferential direction. The second spring guide 282b is formed so as to partially surround the second through hole 185b in the circumferential direction. The axial length of the first spring guide 281b is longer than that of the second spring guide 282b.

The first ink containing tube 9b extends through the first through hole 184b, the pipe member 19b and the first spring guide 281b, and is fixed to the rotor 17b. The second ink containing tube 12b extends through the second through hole 185b and the second spring guide 282b and is fixed to the second knock member 6b.

The first spring 21b is disposed so as to circumferentially surround the first ink containing tube 9b between the rear surface of the second press-fitting portion 188b of the spacer 18b and the front end of the pipe member 19b, and the pipe member 19b and thus the rotor 17b. And, the first cursive body 3b is biased rearward. The second spring 22b is disposed between the rear surface of the second press-fitting portion 188b of the spacer 18b and the urging surface 64b of the second knock member 6b so as to surround the second ink containing tube 12b in the circumferential direction. The knock member 6b and thus the second cursive body 4b are urged rearward. The installation of the first spring 21b and the second spring 22b is assisted by the first spring guide 281b and the second spring guide 282b.

Hereinafter, the principle that the first writing body 3b and the second writing body 4b protrude from the front end of the barrel 2b, and the protrusion of the first writing body 3b and the second writing body 4b are the first knock member 5b or the second knock member 6b. The principle and the principle to be released by will be described in detail.

22(a) and 22(b) are partial front cross-sectional views of the multi-core writing instrument 1b taken along the line K2-K2 of FIG. 12(b) when the first writing body 3b projects, respectively. FIG. 13 is a partial front sectional view of the multi-core writing instrument 1b taken along the line K2-K2 in FIG. 12B when the second writing body 4b of FIG.

First, the principle that the first writing body 3b projects from the front end of the barrel 2b will be described.

In the retracted state, as shown in FIG. 14A, the inner cam 179b of the rotor 17b is housed in the first recess 352 or the second recess 353 of the inner cylinder 15b. When the knock rod 16b is moved forward against the biasing force of the first spring 21b from this state, the cam surface 163b of the knock rod 16b abuts the cam receiving surface 278b of the rotor 17b, and the rotor 17b moves together with the knock rod 16b. Advance. At this time, the knock rod 16b and the rotor 17b receive the axial force and the circumferential force from each other via the cam surface 163b and the cam receiving surface 278b. After that, when the rear end of the inner cam 179b exceeds the front end of the thick portion 351b, the regulation of the rotor 17b in the circumferential direction is released, and thus the rotor 17b is circumferentially moved by the force in the circumferential direction (when viewed from the front side, the rotor 17b is not supported). Rotate clockwise). On the other hand, the knock rod 16b does not rotate in the circumferential direction because the projection 162b abuts the outer cam 155b of the inner cylinder 15b or the thick portion 351b to restrict rotation in the circumferential direction.

When the knock rod 16b is released in this state, the knock rod 16b and the rotor 17b are retracted by the urging force of the first spring 21b. At this time, the rear end of the inner cam 179b of the rotor 17b rotated in the circumferential direction axially engages with the front end of the thick portion 351b of the inner cylinder 15b. This engagement prevents the rotor 17b from retreating, so that the first writing body 3b fixed to the rotor 17b is maintained in a protruding state from the front end of the barrel 2b.

Hereinafter, the principle that the protrusion of the first writing body 3b is released by the first knock member 5b will be described.

In the protruding state, the inner cam 179b of the rotor 17b engages with the thick portion 351b of the inner cylinder 15b in the axial direction. When the knock rod 16b is moved forward against the biasing force of the first spring 21b from this state, the cam surface 163b of the knock rod 16b abuts the cam receiving surface 278b of the rotor 17b, and the rotor 17b moves together with the knock rod 16b. Advance. At this time, the knock rod 16b and the rotor 17b receive the axial force and the circumferential force from each other via the cam surface 163b and the cam receiving surface 278b. As a result, the inner cam 179b of the rotor 17b and the thick portion 351b of the inner cylinder 15b are disengaged from each other in the axial direction, so that the rotor 17b is circumferentially moved by the force in the circumferential direction (counterclockwise when viewed from the front). Rotate). On the other hand, the knock rod 16b does not rotate in the circumferential direction because the projection 162b abuts the outer cam 155b of the inner cylinder 15b or the thick portion 351b to restrict rotation in the circumferential direction.

When the knock rod 16b is released in this state, the knock rod 16b and the rotor 17b are retracted by the urging force of the first spring 21b, and the inner cam 179b rotated in the circumferential direction is further rotated from the outer cam 155b of the inner cylinder 15b. It receives a force in the direction and is accommodated in the first recess 352 or the second recess 353 of the inner cylinder 15b. At this time, the first writing body 3b fixed to the rotor 17b also retracts, so that the protrusion of the first writing body 3b is released.

Hereinafter, the principle that the protrusion of the first writing body 3b is released by the second knock member 6b will be described.

In the protruding state, the inner cam 179b of the rotor 17b engages with the thick portion 351b of the inner cylinder 15b in the axial direction. At this time, as shown in FIG. 22(a), the pressing protrusion 65b of the second knock member 6b is located rearward of the inner cam 179b of the rotor 17b, and two of the four inner cams 179b are circumferentially positioned. Is equal to the pressing protrusion 65b.

When the second knock member 6b is moved forward against the biasing force of the second spring 22b from this state, the cam surface 66b of the second knock member 6b abuts on the cam receiving surface 278b of the rotor 17b, and the rotor 17b moves. It advances together with the second knock member 6b. At this time, the second knock member 6b and the rotor 17b receive forces in the axial direction and the circumferential direction, respectively, via the cam surface 66b and the cam receiving surface 278b. As a result, the inner cam 179b of the rotor 17b and the thick portion 351b of the inner cylinder 15b are disengaged from each other in the axial direction. Rotate). On the other hand, the second knock member 6b does not rotate in the circumferential direction because the rotation of the second knock member 6b in the circumferential direction is restricted by the operation portion 63b contacting the rail 257b of the inner cylinder 15b. The inner cam 179b rotated in the circumferential direction receives a further circumferential force from the outer cam 155b of the inner cylinder 15b, and is housed in the first recess 352 or the second recess 353 of the inner cylinder 15b. At this time, since the rotor 17b and the knock rod 16b retract, the first writing body 3b fixed to the rotor 17b also retracts, and the protrusion of the first writing body 3b is released.

Hereinafter, the principle that the second cursive body 4b projects from the front end of the barrel 2b will be described.

In the retracted state, the operating portion 63b of the second knock member 6b is located at the rear end of the sliding hole 259b of the inner cylinder 15b and the sliding hole 81b of the rear shaft cylinder 8b. From this state, the second knock member 6b is advanced against the biasing force of the second spring 22b. After that, when the rear end of the second knock member 6b exceeds the front end of the inner cylinder 15b, the operating portion 63b of the second knock member 6b falls inward in the radial direction.

When the second knock member 6b is released in this state, the rear end of the second knock member 6b is axially engaged with the front end of the inner cylinder 15b by the urging force of the second spring 22b, as shown in FIG. 22(b). To meet. This engagement prevents the second knock member 6b from retracting, so that the second writing body 4b fixed to the second knock member 6b projects from the front end of the barrel 2b.

Hereinafter, the principle that the protrusion of the second cursive body 4b is released by the first knock member 5b will be described.

In the protruding state, the second knock member 6b engages with the inner cylinder 15b in the axial direction. At this time, as shown in FIG. 22B, the front surface of the rotor 17b is located rearward of the first contact surface 68b of the second knock member 6b.

When the knock rod 16b is moved forward against the biasing force of the first spring 21b from this state, the cam surface 163b of the knock rod 16b abuts the cam receiving surface 278b of the rotor 17b, and the rotor 17b moves together with the knock rod 16b. Advance. After that, when the front surface of the rotor 17b contacts the first contact surface 68b of the second knock member 6b, the first contact surface 68b of the second knock member 6b receives a force radially outward from the front surface of the rotor 17b. The engagement between the second knock member 6b and the inner cylinder 15b is released. After that, the second knock member 6b is retracted by the urging force of the second spring 22b, so that the second writing body 4b fixed to the second knock member 6b is also retracted, and the projection of the second writing body 4b is released. ..

Hereinafter, the principle that the projection of the second cursive body 4b is released by the second knock member 6b will be described.

In the protruding state, the second knock member 6b engages with the inner cylinder 15b in the axial direction. At this time, the pressing surface 69b of the second knocking member 6b of the second writing body 4b that does not project is located rearward of the second contact surface 70b of the second knocking member 6b of the second writing body 4b that projects. The pressing surface 69b and the second contact surface 70b partially overlap each other in the circumferential direction.

From this state, when the second knock member 6b of the second writing body 4b that does not project is advanced against the biasing force of the second spring 22b, the second knock member 6b of the second writing body 4b that does not project is pressed. The surface 69b contacts the second contact surface 70b of the second knock member 6b of the protruding second writing body 4b. At this time, the second contact surface 70b receives a radially outward force from the pressing surface 69b, so that the engagement between the second knock member 6b and the inner cylinder 15b is released. After that, the second knock member 6b is retracted by the urging force of the second spring 22b, so that the second writing body 4b fixed to the second knock member 6b is also retracted, and the projection of the second writing body 4b is released. ..

Hereinafter, the multi-core writing instrument according to the third embodiment of the present invention will be described with reference to FIGS. 23 to 33. The third embodiment is different from the second embodiment in that the second cursive body is three, and the functions and configurations of the components are the same as those in the second embodiment.

First, the configuration and operation of the multi-core writing instrument according to the third embodiment of the present invention will be briefly described with reference to FIGS. 23 to 25.

23A and 23B are respectively a front view and a side view of the multi-core writing instrument 1c according to the third embodiment of the present invention. 24A and 24B are respectively a front cross-sectional view of the multi-core writing instrument 1c taken along the line K2-K2 in FIG. 23B and a line J2-J2 in FIG. 23A. It is a side surface sectional view of multi-core type writing instrument 1c. 25A to 25C are plan sectional views of the multi-core writing instrument 1c taken along the lines L2-L2, M2-M2 and N2-N2 of FIG. 24B, respectively.

The multi-core writing instrument 1c (hereinafter, simply referred to as "writing instrument 1c") includes a barrel 2c, a first writing body 3c and a second writing body 4c arranged in the barrel 2c, and a first writing body 3c. It comprises a first knock member 5c arranged at the rear end and a second knock member 6c arranged at the rear end of the second cursive body 4c. In addition, in this specification, the tip of the writing instrument 1c, that is, the pen tip side is defined as the "front" side of the writing instrument 1c, and the side opposite to the pen tip of the writing instrument 1c is along the axial direction (longitudinal direction) of the writing instrument 1c. Defined as the "rear" side of 1c. Regarding the component parts of the writing instrument 1c, the pen tip side of the writing instrument 1c is defined as the "front" side of the component item in the assembled state of the writing instrument 1c, and the pen tip of the writing instrument 1c is defined along the axial direction of the writing instrument 1c. The opposite side is defined as the "rear" side of the component.

In the present embodiment, the first writing body 3c is one ballpoint pen, and the second writing body 4c is three ballpoint pens. The first writing body 3c is disposed inside the shaft cylinder 2c at the radial center of the shaft cylinder 2c, and the second writing body 4c is located inside the shaft cylinder 2c on the radially outer side of the shaft cylinder 2c with respect to the first writing body 3c. It is arranged. The three second writing bodies 4c are arranged at equal intervals in the circumferential direction so as to surround the first writing body 3c in the circumferential direction.

The first knock member 5c is configured to selectively project the first writing body 3c from the front end of the barrel 2c. The second knock member 6c is configured to selectively project the second writing body 4c from the front end of the barrel 2c. Specifically, when the first knock member 5c is operated, the first writing body 3c projects, and when the second knock member 6c is operated, the second writing body 4c projects. The pen tip of the second cursive body 4c moves radially inward along the inner surface of the barrel 2c and projects from the front end of the barrel 2c. As a result, it is possible to write by selectively using one of the four writing bodies.

The protrusion of the first writing body 3c is released by operating the first knock member 5c or the second knock member 6c. The protrusion of the second cursive body 4c is released by operating the first knock member 5c or the second knock member 6c of the cursive body that does not protrude. Therefore, the protrusion of the first writing body 3c and the second writing body 4c can be released by operating any one knock member, so that the operability of the writing instrument 1c is significantly improved.

Hereinafter, the components of the writing instrument 1c will be described in detail with reference to FIGS.

As shown in FIG. 23, the barrel 2c includes a front barrel 7c and a rear barrel 8c arranged rearward of the front barrel 7c. The front barrel 7c and the rear barrel 8c are connected via a spacer 18c described later. The front barrel 7c and the rear barrel 8c may be directly connected by press fitting or the like as in the first embodiment.

26A to 26C are respectively a front view and a side view of the rear barrel 8c, and a side cross-sectional view of the rear barrel 8c taken along the line O2-O2 of FIG. Three sliding holes 81c are formed on the outer peripheral surface of the rear barrel 8c so that the second knock member 6c can slide in the axial direction. The sliding hole 81c extends in the axial direction. A fitting hole 84c and a fitting groove 85c for fitting with an inner cylinder 15c described later are formed at the rear end of the rear barrel 8c.

As shown in FIG. 24A, the first writing body 3c includes a first ink storage tube 9c, a first joint 10c, and a first tip 11c, and the second writing body 4c includes a second ink storage tube 12c. , The second joint 13c and the second tip 14c. The first tip 11c is connected to the first ink containing tube 9c via the first joint 10c. The second tip 14c is connected to the second ink containing tube 12c via the second joint 13c.

The first ink containing tube 9c and the three second ink containing tubes 12c typically contain inks of different colors. By disposing the first knock member 5c behind the second knock member 6c, the length of the first ink containing tube 9c can be made longer than that of the second ink containing tube 12c. As a result, the ink filling amount of the first ink containing tube 9c can be made larger than the filling amount of the second ink containing tube 12c. Therefore, for example, by storing black ink, which is generally used frequently, in the first ink storage tube 9c, it is possible to extend the life of the writing instrument 1c or reduce the frequency of writing element replacement. Further, in order to obtain the same effect, the radial length of the first ink containing tube 9c is set so that the ink filling amount of the first ink containing tube 9c becomes larger than the filling amount of the second ink containing tube 12c. It may be longer than the second ink containing tube 12c.

The first knock member 5c includes an inner cylinder 15c fixed to the rear shaft cylinder 8c, a knock bar 16c arranged in the inner cylinder 15c and protruding rearward from the inner cylinder 15c, and arranged in front of the knock bar 16c. And a rotor 17c that has been rotated. As will be described later in detail, by pressing the knock bar 16c and rotating the rotor 17c, the first writing body 3c can be projected and retracted from the front end of the barrel 2c.

27A to 27D are respectively a front view, a side view, a perspective view of the inner cylinder 15c, and a side cross-sectional view of the inner cylinder 15c taken along the line P2-P2 of FIG. 27A. The inner cylinder 15c has a clip portion 252c and an insertion portion 253c. The clip portion 252c has an elongated shape, and when the inner cylinder 15c is fixed to the shaft cylinder 2c, extends substantially outside the shaft cylinder 2c in the axial direction. A ball portion 254c that protrudes inward in the radial direction of the shaft tube 2c is provided on the front portion of the clip portion 252c. A fitting portion 255c that fits into the fitting groove 85c of the rear barrel 8c is provided at the base of the clip portion 252c.

The insertion portion 253c has a hollow, substantially cylindrical shape. The rear portion of the insertion portion 253c is exposed from the shaft cylinder 2c when the inner cylinder 15c is fixed to the shaft cylinder 2c. A through hole 256c extending in the axial direction is formed in the rear portion of the insertion portion 253c, and the knock rod 16c projects rearward from the inner cylinder 15c through the through hole 256c.

Six rails 257c that fit into the fitting holes 84c of the rear barrel 8c are provided on the outer peripheral surface of the insertion portion 253c. The rail 257c projects radially outward from the outer peripheral surface of the insertion portion 253c and extends in the axial direction from the rear portion to the front end of the insertion portion 253c.

The insertion portion 253c is formed with three sliding holes 259c extending in the axial direction from the rear portion to the front end so that the second knock member 6c can slide in the axial direction. When the inner cylinder 15c is fixed to the shaft cylinder 2c, the circumferential position of the sliding hole 259c of the inner cylinder 15c is equal to the sliding hole 81c of the shaft cylinder 2c. When the second knock member 6c receives a force in the circumferential direction, the second knock member 6c contacts the rail 257c forming the side wall of the sliding hole 259c.

28 is an enlarged cross-sectional view of the insertion portion 253c of the inner cylinder 15b taken along the line Q2-Q2 of FIG. 27(b). The insertion portion 253c has three outer cams 155c on the inner peripheral surface. The three outer cams 155c are arranged at equal intervals in the circumferential direction. The insertion portion 253c further has three thick portions 351c on the inner peripheral surface. The two thick portions 351c are arranged at equal intervals in the circumferential direction. The outer cams 155c and the thick portions 351c are circumferentially separated from each other and arranged alternately. The outer cam 155c and the thick portion 351c have the same radial thickness. Three recesses 354 are formed between the outer cam 155c and the thick portion 351c.

The recess 354 accommodates a protrusion 162c of a knock rod 16c described later. Further, as shown in FIG. 25A, the recess 354 accommodates an inner cam 179c of the rotor 17c, which will be described later, in the retracted state of the first writing body 3c.

The inner cylinder 15c may be integrated with the rear shaft cylinder 8c. Further, the inner cylinder 15c may not have the clip portion 252c as in the first embodiment.

29A to 29D are respectively a front view, a bottom view, a perspective view of the knock rod 16c, and a cross-sectional view of the knock rod 16c taken along the line R2-R2 of FIG. 29A. The knock rod 16c has a substantially columnar shape. An accommodation space 164c for partially accommodating the rotor 17c is formed inside the knock rod 16c. The user of the writing instrument 1c can operate the first knock member 5c by pressing the rear end of the knock bar 16c with a finger.

The knock bar 16c has three projections 162c on the outer peripheral surface thereof, which project outward in the radial direction and extend in the axial direction. The three protrusions 162c are arranged at equal intervals in the circumferential direction. Each protrusion 162c is configured to slide in the recess 354 of the inner cylinder 15c in the axial direction when the knock rod 16c moves in the axial direction. That is, the knock bar 16c and the inner cylinder 15c are configured to restrict the rotation of the knock bar 16c in the circumferential direction. A cam surface 163c is formed on the front end of the knock rod 16c over the entire circumference. The cam surface 163c is composed of a plurality of slopes.

30A to 30D are respectively a front view, a plan view, a perspective view of the rotor 17c, and a cross-sectional view of the rotor 17c taken along the line S2-S2 of FIG. 30A. The rotor 17c has a hollow and substantially cylindrical shape, and has an insertion portion 171c inserted into the accommodation space 164c of the knock rod 16c, and a cam receiving portion 275c arranged in front of the insertion portion 171c. The knock bar 16c and the rotor 17c are configured to move in the axial direction within the inner cylinder 15c.

As shown in FIG. 24, the first ink containing tube 9c is press fitted into the cam receiving portion 275c. As a result, the first ink containing tube 9c is fixed to the rotor 17c. A first contact surface 276c with which the rear end of the first ink containing tube 9c abuts is formed inside the cam receiving portion 275c. Further, a ventilation hole 176c for ensuring ventilation of the first ink containing tube 9c extends in the axial direction from the first contact surface 276c to the rear end of the rotor 17c. Further, as shown in FIG. 24, a pipe member 19c described later is also press-fitted into the cam receiving portion 275c. As a result, the pipe member 19c is fixed to the rotor 17c. A second contact surface 277c with which the rear end of the pipe member 19c abuts is formed inside the cam receiving portion 275c.

On the outer peripheral surface of the cam receiving portion 275c, three inner cams 179c and a groove 271c extending in the axial direction are formed. The three inner cams 179c are arranged at equal intervals in the circumferential direction. A cam receiving surface 278c that interacts with the cam surface 163c of the knock rod 16c is formed at the front end of the inner cam 179c. The cam surface 163c and the cam receiving surface 278c are configured so that the cam receiving surface 278c receives axial and circumferential forces from the cam surface 163c when the knock rod 16c advances. Therefore, when the cam surface 163c presses the cam receiving surface 278c by the forward movement of the knock rod 16c, the rotor 17c rotates in the circumferential direction by the circumferential force. On the other hand, the knock rod 16c is restricted from rotating in the circumferential direction because the protrusion 162c contacts the outer cam 155c of the inner cylinder 15c.

When the inner cam 179c is accommodated in the recess 354 of the inner cylinder 15c as shown in FIG. 25(a), when the rotor 17c is rotated in the circumferential direction by the forward movement of the knock rod 16c, the meat of the inner cylinder 15c is reduced. It engages with the thick portion 351c in the axial direction. Further, when the inner cam 179c is engaged with the thick portion 351c in the axial direction and the rotor 17c is rotated in the circumferential direction by the forward movement of the knock rod 16c, the engagement with the thick portion 351c is released. After that, it receives a further circumferential force from the outer cam 155c and is housed in the recess 354. When the inner cam 179c is housed in the recess 354, the outer cam 155c and the thick portion 351c are housed in the groove 271c between the inner cams 179c. That is, the inner cylinder 15c and the rotor 17c are configured such that when the rotor 17c rotates in the circumferential direction due to the forward movement of the knock rod 16c, the inner cylinder 15c and the rotor 17c are engaged with each other or released from the engagement in the axial direction.

31A to 31C are a front view, a right side view and a perspective view of the second knock member 6c, respectively. The second knock member 6c has an elongated shape. The three second knock members 6c have the same shape. As a result, the parts can be shared, and the cost of the writing instrument 1c can be reduced.

The second knock member 6c includes a body portion 61c extending in the front-rear direction, a fitting portion 62c formed in front of the body portion 61c, an operation portion 63c formed in the rear portion of the body portion 61b, and a body portion 61c. And contact portions 67c formed on both sides of the. As shown in FIG. 24B, the fitting portion 62c fits into the second ink containing tube 12c. As a result, the second ink containing tube 12c is fixed to the second knock member 6c. As shown in FIG. 23, since the operating portion 63c projects radially outward from the barrel 2c in the assembled state of the writing instrument 1c, it can be operated with a finger.

The body portion 61c is formed with a biasing surface 64c against which a second spring 22c described later abuts. In addition, a first contact surface 68c that is pressed by the front surface of the rotor 17c when the protrusion of the second knock member 6c is released by the operation of the first knock member 5c is formed at the rear end of the body portion 61c. The first contact surface 68c is configured to receive axial and radial forces from the front surface of the rotor 17c during contact.

A pressing protrusion 65c is formed on the bottom surface of the main body 61c. As shown in FIG. 24(b), the pressing protrusion 65c projects inward in the radial direction of the barrel 2c and extends in the axial direction in the assembled state of the writing instrument 1c. A cam surface 66c that interacts with the cam receiving surface 278c of the rotor 17c is formed at the front end of the pressing protrusion 65c. The cam surface 66c and the cam receiving surface 278c are configured so that the cam receiving surface 278c receives a force in the axial direction and the circumferential direction from the cam surface 66c when the second knock member 6c advances. Therefore, when the cam surface 66c presses the cam receiving surface 278c by the forward movement of the second knock member 6c, the rotor 17c is rotated in the circumferential direction by the circumferential force. On the other hand, the second knock member 6c is restricted from rotating in the circumferential direction because the operating portion 63c contacts the rail 257c of the inner cylinder 15c.

As shown in FIG. 25(a), in the assembled state of the writing instrument 1c, the contact portion 67c extends substantially in the circumferential direction of the barrel 2c, and the contact portions 67c of the three second knock members 6c are circumferentially aligned with each other. Adjacent. In other words, the main body portion 61c and the contact portion 67c of each second knock member 6c extend within a range of approximately 120° of the entire circumference (360°) of the barrel 2c.

At the front end of the contact portion 67c, when the projection of the second writing body 4c is released by the operation of the second knock member 6c of the second writing body 4c that does not project, the second knocking of the second writing body 4c protruding. Two pressing surfaces 69c that press the member 6c are formed. At the rear end of the contact portion 67c, when the projection of the second writing body 4c is released by operating the second knock member 6c of the second writing body 4c that does not project, the second writing body 4c that does not project Two second contact surfaces 70c pressed by the knock member 6c are formed. The pressing surface 69c and the second contact surface 70c are configured to receive an axial force and a radial force with respect to each other at the time of contact.

The writing instrument 1c further includes a pipe member 19c press-fitted into the rotor 17c, a first spring 21c, a second spring 22c, and a spacer 18c that supports the first spring 21c and the second spring 22c.

The pipe member 19c has a hollow cylindrical shape. The front portion of the pipe member 19c is press fitted into the rotor 17c. As a result, the pipe member 19c is fixed to the rotor 17c. The pipe member 19c may be fixed to the rotor 17c by adhesion. As shown in FIG. 24, the front end of the pipe member 19c is biased by the first spring 21c.

32A to 32D are a front view, a side view, a perspective view and a bottom view of the spacer 18c, respectively. The spacer 18c is formed between the first press-fitting portion 187c that is press-fitted into the front barrel 7c, the second press-fitting portion 188c that is press-fitted into the rear barrel 8c, and the first press-fitting portion 187c and the second press-fitting portion 188c. The exposed portion 189c and four spring guides (first spring guide 281c and second spring guide 282c) extending rearward from the second press-fitting portion 188c are included. The first press-fitting portion 187c and the second press-fitting portion 188c may be fixed to the front barrel 7c and the rear barrel 8c by adhesion or screwing, respectively.

The first press-fitting portion 187c has a hollow and substantially cylindrical shape, and the second press-fitting portion 188c has a columnar shape. The rear surface of the second press-fitting portion 188c supports the first spring 21c and the second spring 22c. The exposed portion 189c has the same diameter as the shaft cylinder 2c, and as shown in FIG. 23, constitutes an outer peripheral surface of the writing instrument 1c together with the front shaft cylinder 7c and the rear shaft cylinder 8c.

Four through holes are formed in the exposed portion 189c and the second press-fitting portion 188c. A first through hole 184c is formed at the center in the radial direction, and three second through holes 185c are formed outside the first through hole 184c in the radial direction. The three second through holes 185c are arranged at equal intervals in the circumferential direction so as to surround the first through hole 184c in the circumferential direction. The first spring guide 281c is formed to partially surround the first through hole 184c in the circumferential direction. The second spring guide 282c is formed to partially surround the second through hole 185c in the circumferential direction. The axial length of the first spring guide 281c is longer than that of the second spring guide 282c.

The first ink containing tube 9c extends through the first through hole 184c, the pipe member 19c and the first spring guide 281c, and is fixed to the rotor 17c. The second ink containing tube 12c extends through the second through hole 185c and the second spring guide 282c and is fixed to the second knock member 6c.

The first spring 21c is arranged so as to circumferentially surround the first ink containing tube 9c between the rear surface of the second press-fitting portion 188c of the spacer 18c and the front end of the pipe member 19c, and the pipe member 19c and thus the rotor 17c. And, the first cursive body 3c is biased rearward. The second spring 22c is disposed between the rear surface of the second press-fitting portion 188c of the spacer 18c and the urging surface 64c of the second knock member 6c so as to surround the second ink containing tube 12c in the circumferential direction. The knock member 6c and thus the second cursive body 4c are biased rearward. The installation of the first spring 21c and the second spring 22c is assisted by the first spring guide 281c and the second spring guide 282c.

Hereinafter, the principle that the first writing body 3c and the second writing body 4c project from the front end of the barrel 2c, and the projection of the first writing body 3c and the second writing body 4c are the first knock member 5c or the second knock member 6c. The principle and the principle to be released by will be described in detail.

FIGS. 33(a) and 33(b) are partial side cross-sectional views of the multi-core writing instrument 1c taken along the line J2-J2 of FIG. 23(a) when the first writing body 3b projects, respectively. FIG. 24 is a partial side cross-sectional view of the multi-core writing instrument 1c taken along the line J2-J2 in FIG. 23A when two second writing bodies 4c are protruding.

First, the principle that the first writing body 3c projects from the front end of the barrel 2c will be described.

In the retracted state, as shown in FIG. 25A, the inner cam 179c of the rotor 17c is housed in the recess 354 of the inner cylinder 15c. When the knock rod 16c is moved forward against the biasing force of the first spring 21c from this state, the cam surface 163c of the knock rod 16c contacts the cam receiving surface 278c of the rotor 17c, and the rotor 17c moves together with the knock rod 16c. Advance. At this time, the knock bar 16c and the rotor 17c receive forces in the axial direction and the circumferential direction, respectively, via the cam surface 163c and the cam receiving surface 278c. After that, when the rear end of the inner cam 179c exceeds the front end of the thick portion 351c, the regulation of the rotor 17c in the circumferential direction is released, so that the rotor 17c is circumferentially moved by the force in the circumferential direction. Rotate clockwise). On the other hand, the knock rod 16c does not rotate in the circumferential direction because the projection 162c abuts the outer cam 155c of the inner cylinder 15c to restrict rotation in the circumferential direction.

When the knock rod 16c is released in this state, the knock rod 16c and the rotor 17c are retracted by the urging force of the first spring 21c. At this time, a part of the rear end of the inner cam 179c of the rotor 17c rotated in the circumferential direction axially engages with the front end of the thick portion 351c of the inner cylinder 15c. This engagement prevents the rotor 17c from retreating, so that the first writing body 3c fixed to the rotor 17c is maintained in a protruding state from the front end of the barrel 2c.

Hereinafter, the principle that the protrusion of the first writing body 3c is released by the first knock member 5c will be described.

In the protruding state, the inner cam 179c of the rotor 17c engages with the thick portion 351c of the inner cylinder 15c in the axial direction. When the knock rod 16c is moved forward against the urging force of the first spring 21c from this state, the cam surface 163c of the knock rod 16c contacts the cam receiving surface 278c of the rotor 17c, and the rotor 17c moves together with the knock rod 16c. Advance. At this time, the knock bar 16c and the rotor 17c receive forces in the axial direction and the circumferential direction, respectively, via the cam surface 163c and the cam receiving surface 278c. As a result, the inner cam 179c of the rotor 17c and the thick portion 351c of the inner cylinder 15c are disengaged from each other in the axial direction. Rotate). On the other hand, the knock rod 16c does not rotate in the circumferential direction because the projection 162c abuts the outer cam 155c of the inner cylinder 15c to restrict rotation in the circumferential direction.

When the knock bar 16c is released in this state, the knock bar 16c and the rotor 17c are retracted by the urging force of the first spring 21c, and the inner cam 179c rotated in the circumferential direction is further rotated from the outer cam 155c of the inner cylinder 15c. It receives a directional force and is accommodated in the recess 354 of the inner cylinder 15c. At this time, the first cursive body 3c fixed to the rotor 17c also retracts, so that the projection of the first cursive body 3c is released.

Hereinafter, the principle that the protrusion of the first writing body 3c is released by the second knock member 6c will be described.

In the protruding state, a part of the inner cam 179c of the rotor 17c engages with the thick portion 351c of the inner cylinder 15c in the axial direction. At this time, as shown in FIG. 33A, the pressing protrusion 65c of the second knock member 6c is located rearward of the inner cam 179c of the rotor 17c. Further, the inner cam 179c partially overlaps the pressing protrusion 65c in the circumferential direction.

When the second knock member 6c is moved forward against the biasing force of the second spring 22c from this state, the cam surface 66c of the second knock member 6c abuts on the cam receiving surface 278c of the rotor 17c, and the rotor 17c moves. It advances with the second knock member 6c. At this time, the second knock member 6c and the rotor 17c receive forces in the axial direction and the circumferential direction, respectively, via the cam surface 66c and the cam receiving surface 278c. As a result, the inner cam 179c of the rotor 17c and the thick portion 351c of the inner cylinder 15c are disengaged from each other in the axial direction, so that the rotor 17c is circumferentially moved by the force in the circumferential direction (counterclockwise when viewed from the front). Rotate). On the other hand, the second knock member 6c does not rotate in the circumferential direction because the rotation of the second knock member 6c in the circumferential direction is restricted by the operation portion 63c contacting the rail 257c of the inner cylinder 15c. The inner cam 179c rotated in the circumferential direction receives a further circumferential force from the outer cam 155c of the inner cylinder 15c, and is housed in the recess 354 of the inner cylinder 15c. At this time, since the rotor 17c and the knock bar 16c retract, the first cursive body 3c fixed to the rotor 17c also recedes, and the protrusion of the first cursive body 3c is released.

Hereinafter, the principle that the second cursive body 4c projects from the front end of the barrel 2c will be described.

In the retracted state, the operation portion 63c of the second knock member 6c is located at the rear end of the sliding hole 259c of the inner cylinder 15c and the sliding hole 81c of the rear shaft cylinder 8c. From this state, the second knock member 6c is moved forward against the biasing force of the second spring 22c. After that, when the rear end of the second knock member 6c exceeds the front end of the inner cylinder 15c, the operating portion 63c of the second knock member 6c falls inward in the radial direction.

When the second knock member 6c is released in this state, the rear end of the second knock member 6c is axially engaged with the front end of the inner cylinder 15c by the urging force of the second spring 22c. This engagement prevents the second knock member 6c from retracting, so that the second writing body 4c fixed to the second knock member 6c projects from the front end of the barrel 2c.

Hereinafter, the principle that the protrusion of the second cursive body 4c is released by the first knock member 5c will be described.

In the protruding state, the second knock member 6c engages with the inner cylinder 15c in the axial direction. At this time, the front surface of the rotor 17c is located rearward of the first contact surface 68c of the second knock member 6c.

When the knock rod 16c is moved forward against the urging force of the first spring 21c from this state, the cam surface 163c of the knock rod 16c contacts the cam receiving surface 278c of the rotor 17c, and the rotor 17c moves together with the knock rod 16c. Advance. Thereafter, when the front surface of the rotor 17c contacts the first contact surface 68c of the second knock member 6c, the first contact surface 68c of the second knock member 6c receives a force radially outward from the front surface of the rotor 17c. The engagement between the second knock member 6c and the inner cylinder 15c is released. After that, the second knock member 6c is retracted by the urging force of the second spring 22c, so that the second writing body 4c fixed to the second knock member 6c is also retracted, and the projection of the second writing body 4c is released. ..

Hereinafter, the principle that the protrusion of the second cursive body 4c is released by the second knock member 6c will be described.

In the protruding state, the second knock member 6c engages with the inner cylinder 15c in the axial direction. At this time, the pressing surface 69c of the second knock member 6c of the second writing body 4c that does not project is located rearward of the second contact surface 70c of the second knock member 6c of the second writing body 4c that projects. The pressing surface 69c and the second contact surface 70c partially overlap each other in the circumferential direction.

From this state, when the second knock member 6c of the non-protruding second writing body 4c is advanced against the biasing force of the second spring 22c, the second knock member 6c of the non-protruding second writing body 4c is pressed. The surface 69c contacts the second contact surface 70c of the second knock member 6c of the protruding second writing body 4c. At this time, the second contact surface 70c receives a radially outward force from the pressing surface 69c, so that the engagement between the second knock member 6c and the inner cylinder 15c is released. After that, the second knock member 6c is retracted by the urging force of the second spring 22c, so that the second writing body 4c fixed to the second knock member 6c is also retracted, and the projection of the second writing body 4b is released. ..

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the claims. For example, the first cursive body may be a mechanical pencil instead of a ballpoint pen. In this case, it is possible to release the protrusion of the first writing body by the first knock member while allowing the lead of the mechanical pencil to be extended by urging the first writing body with two types of springs having different elastic forces. it can. The features of the first embodiment, the second embodiment, and the third embodiment can be implemented in any combination.

1a, 1b, 1c Multi-core writing instrument (writing instrument)
2a, 2b, 2c Shaft barrels 3a, 3b, 3c First cursive body 4a, 4b, 4c Second cursive body 5a, 5b, 5c First knock member 6a, 6b, 6c Second knock member 66a, 66b, 66c Cam surface 7a, 7b, 7c Front barrel 8a, 8b, 8c Rear barrel 9a, 9b, 9c First ink containing pipe 10a, 10b, 10c First joint 11a, 11b, 11c First tip 12a, 12b, 12c Second ink Storage tube 13a, 13b, 13c Second joint 14a, 14b, 14c Second tip 15a, 15b, 15c Inner cylinder 155a, 155b, 155c Outer cam 16a, 16b, 16c Knock rod 162a, 162b, 162c Protrusion 163a, 163b, 163c Cam surface 17a, 17b, 17c Rotor 171a, 171b, 171c Insert portion 178 First cam receiving surface 179a, 179b, 179c Inner cam 272 Cam protrusion 273 Second cam receiving surface 278b, 278c Cam receiving surface 18a, 18b, 18c Spacer 19a, 19b, 19c Pipe member 20 Transmission member 21a, 21b, 21c First spring 22a, 22b, 22c Second spring

Claims (2)

A shaft cylinder,
A first cursive body disposed inside the shaft cylinder at a central portion in the radial direction of the shaft cylinder;
At least two second cursive bodies arranged in the shaft cylinder on the radially outer side of the shaft cylinder with respect to the first cursive body;
A first knock member arranged at the rear end of the first writing body and configured to selectively project the first writing body from the front end of the barrel;
A multi-core writing instrument comprising: a second knock member arranged at a rear end of the second writing body and configured to selectively project the second writing body from a front end of the barrel.
The protrusion of the second cursive body is released by operating the first knock member ,
The axial length of the ink container of the first cursive body is longer than that of the ink container of the second cursive body, and the ink filling amount of the ink container of the first cursive body is the ink of the second cursive body. A multi-core writing instrument characterized by having more than the storage tube . A shaft cylinder,
A first cursive body disposed inside the shaft cylinder at a central portion in the radial direction of the shaft cylinder;
At least two second cursive bodies arranged in the shaft cylinder on the radially outer side of the shaft cylinder with respect to the first cursive body;
A first knock member arranged at the rear end of the first writing body and configured to selectively project the first writing body from the front end of the barrel;
A multi-core writing instrument comprising: a second knock member arranged at a rear end of the second writing body and configured to selectively project the second writing body from a front end of the barrel.
The protrusion of the first cursive body is released by the operation of the second knock member ,
The axial length of the ink container of the first cursive body is longer than that of the ink container of the second cursive body, and the ink filling amount of the ink container of the first cursive body is the ink of the second cursive body. A multi-core writing instrument characterized by having more than the storage tube .

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