JP6411060B2 - Multi-core writing instrument - Google Patents

Description

  The present invention relates to a multi-core type 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 type writing instrument, writing is performed by selectively projecting one of a plurality of writing bodies from the front end of the shaft cylinder.

JP 2013-220642 A

  In the multi-core writing instrument disclosed in Patent Document 1, the mechanical pen disposed at the center of a plurality of ballpoint pens in the shaft cylinder operates a clip disposed outside the shaft cylinder when the pen tip protrudes. It is canceled by doing. In other words, the protruding state of the pen tip cannot be released by pressing a 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, so that intuitive use becomes difficult.

  Then, this invention is made | formed in view of said problem, Comprising: It aims at providing the multi-core type writing instrument with which operativity was improved.

  In the first aspect of the present invention, the shaft tube, the first writing body disposed in the shaft tube at the radial center of the shaft tube, and the shaft tube inside the shaft tube on the radially outer side of the shaft tube than the first writing body. At least two second cursive bodies disposed on the first cursive body and a first knock disposed on the rear end of the first cursive body so as to selectively project the first cursive body from the front end of the shaft cylinder. In a multi-core writing instrument comprising: a member; and a second knock member that is disposed at a rear end of the second cursive body and is configured to selectively protrude the second cursive body from the front end of the shaft cylinder. A multi-core writing instrument is provided in which the protrusion of one writing body is released by the operation of the first knock member.

  In the first aspect of the present invention, the first knock member includes an inner cylinder fixed to the shaft cylinder, a knock bar disposed in the inner cylinder and protruding rearward from the inner cylinder, and disposed in front of the knock bar. The knock rod and the rotor are moved in the axial direction in the inner cylinder, the cam surface is formed on the knock rod, the cam receiving surface is formed on the rotor, the cam surface and The cam receiving surface is configured such that when the knock bar advances, the cam receiving surface receives axial and circumferential forces from the cam surface, and the inner cylinder and the rotor are arranged in the circumferential direction by the advance of the knock bar. It is preferably configured to engage or disengage from each other in the axial direction upon rotation.

  In the first aspect of the present invention, it is preferable that the protrusion of the second writing body is released by the operation of 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 the operation of 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 are such that when the second knock member moves forward, the cam receiving surface is the second knock member. It is preferable to be 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 the is advanced.

  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 another second cursive body that does not protrude.

  In the first aspect of the present invention, the protrusion of the second cursive body is pressed radially outward by the second knock member of the other second cursive body where the second knock member of the second cursive body does not protrude. It is preferable to be released.

  In the first aspect of the present invention, the multi-core writing instrument further includes a transmission member disposed radially inward of the second writing body in the shaft cylinder, 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 protrude 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 shaft cylinder, and the transmission member is fixed to the spacer.

  In the first aspect of the present invention, it is preferable that the length of the first cursive ink storage tube in the axial direction is longer than that of the second cursive ink storage tube.

  In the first aspect of the present invention, it is preferable that the ink filling amount of the ink storage tube of the first cursive body is larger than that of the ink storage tube of the second cursive body.

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

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

  Hereinafter, with reference to FIGS. 1-11, the multi-core type writing instrument which concerns on 1st Embodiment of this invention is demonstrated.

  Initially, with reference to FIGS. 1-3, the structure and operation | movement of the multi-core type writing instrument which concerns on 1st Embodiment of this invention are demonstrated easily.

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

  The multi-core writing instrument 1a (hereinafter simply referred to as “writing instrument 1a”) includes a shaft cylinder 2a, a first writing body 3a and a second writing body 4a disposed in the shaft cylinder 2a, and a first writing body 3a. A first knock member 5a disposed at the rear end and a second knock member 6a disposed at the rear end of the second cursive body 4a are provided. In the present 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 along the axial direction (longitudinal direction) of the writing instrument 1a. It is defined as the “rear” side of 1a. Also, regarding the component parts of the writing instrument 1a, in the assembled state of the writing instrument 1a, the pen tip side of the writing instrument 1a is defined as the “front” side of the component part, and the pen tip of the writing instrument 1a is 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 writing body 3a is disposed in the shaft cylinder 2a at the central portion in the radial direction of the shaft cylinder 2a, and the second writing body 4a is disposed in the shaft cylinder 2a on the radially outer side of the shaft cylinder 2a than the first writing body 3a. Arranged. The first cursive body 3a and the second cursive body 4a are located on the same straight line in the radial direction of the shaft cylinder 2a.

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

  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 cursive body 4a is released by operating the first knock member 5a or the second knock member 6a of the cursive body that does not protrude. Therefore, since the protrusions 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 greatly improved. In addition, in this specification, that the protrusion of a writing body is cancelled | released means that the pen point of the writing body protruding from the front end of the axial cylinder 2a immerses in the axial cylinder 2a.

  Hereinafter, with reference to FIGS. 1-10, the component of the writing instrument 1a is demonstrated in detail.

  As shown in FIG. 1, the shaft tube 2a includes a front shaft tube 7a and a rear shaft tube 8a disposed rearward of the front shaft tube 7a. The front shaft cylinder 7a and the rear shaft cylinder 8a are connected by press-fitting, bonding or screwing. For example, the front cylinder 7a and the rear cylinder 8a are configured such that a female screw formed on the inner peripheral surface on the front side of the rear cylinder 8a is screwed with a male screw formed on the outer peripheral surface on the rear side of the front cylinder 7a. To be connected.

  4A to 4C are a front view, a side view, and a front cross-sectional view of the rear barrel 8a taken along line FF in FIG. 4B, respectively. 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. Four convex portions 82 are formed on the inner peripheral surface of the rear barrel 8a to be engaged with a concave portion 183 of a spacer 18a, which will be described later, and a concave portion 151 of the inner cylinder 15a. As shown in FIG. 3A and FIG. 4C, the convex portion 82 protrudes radially inward and extends substantially in the axial direction. A through-hole 83 is formed at the rear end of the rear barrel 8a for a knock bar (described later) to 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 are provided. The first chip 11a is connected to the first ink storage tube 9a through the first joint 10a. The second tip 14a is connected to the second ink containing tube 12a through the second joint 13a.

  Typically, different colors of ink are stored in the first ink storage tube 9a and the two second ink storage tubes 12a. By disposing the first knock member 5a behind the second knock member 6a, the length of the first ink storage tube 9a can be made longer than that of the second ink storage 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. For this reason, for example, by storing black ink, which is generally frequently used, in the first ink storage tube 9a, it is possible to extend the life of the writing instrument 1a or reduce the frequency of replacement of the writing instrument. In order to obtain the same effect, the length of the first ink storage tube 9a in the radial direction is set so that the ink filling amount of the first ink storage tube 9a is larger than the filling amount of the second ink storage tube 12a. It may be longer than the second ink storage tube 12a.

  The first knock member 5a includes an inner cylinder 15a fixed to the rear cylinder 8a, a knock bar 16a disposed in the inner cylinder 15a and protruding rearward from the inner cylinder 15a, and disposed in front of the knock bar 16a. And a rotor 17a. Although mentioned later in detail, the 1st writing body 3a can be made to appear and disappear from the front end of the axial cylinder 2a by pressing the knock stick | rod 16a and rotating the rotor 17a.

  5A to 5E are a front view, a side view, a bottom view, a perspective view, and a front sectional view of the inner cylinder 15a taken along line GG in FIG. 5B, respectively. It is. The inner cylinder 15a has a hollow and 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 respectively fitted with the four convex portions 82 of the rear barrel 8a. Thus, 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 front end of the sliding groove 152 is engaged with the rear end of the second knock member 6a when the second writing body 4a protrudes from the shaft cylinder 2a. A 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-like portions that extend in the axial direction and are continuously formed in the circumferential direction. The second rod-shaped portion 158 disposed in the middle has a thickness in the radial direction that is thinner than the first rod-shaped portion 157 and the third rod-shaped portion 159 at both ends. As a result, an 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 bar 16a described later. Further, the groove 156 accommodates an inner cam 179a of a rotor 17a, which will be described later, when the first writing body 3a is immersed. The inner cylinder 15a may be integrated with the rear axle cylinder 8a.

  6A to 6D are a front view, a bottom view, and a perspective view of the knock bar 16a, and a cross-sectional view of the knock bar 16a along the line H-H in FIG. 6A, respectively. The knock bar 16a has a hollow, substantially cylindrical shape. Six recesses 161 extending in the axial direction are formed on the outer peripheral surface of the knock bar 16a mainly to improve 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 bar 16a with a finger.

  The knock bar 16a has eight protrusions 162a on the outer peripheral surface that protrude radially outward and extend in the axial direction. The eight protrusions 162a are arranged at equal intervals in the circumferential direction. When the knock bar 16a moves in the axial direction, each protrusion 162a is disposed in the outer cam 155a of the inner cylinder 15a, more specifically, in the housing recess 251 between the first rod-shaped portion 157 and the third rod-shaped portion 159, Or it is comprised so that the inside of the groove | channel 156 between the outer cams 155a may slide in the front-back direction. That is, the knock bar 16a and the inner cylinder 15a are configured to restrict the rotation of the knock bar 16a in the circumferential direction. A cam surface 163a is formed over the entire circumference at the front end of the knock bar 16a. The cam surface 163a is composed of a plurality of inclined surfaces.

  7A to 7D are a front view, a plan view, a perspective view, and a cross-sectional view of the rotor 17a taken along line I-I in FIG. 7A, respectively. The rotor 17a has a hollow, substantially cylindrical shape, and includes an insertion portion 171a inserted into the knock bar 16a, a first cam receiving portion 172 disposed in front of the insertion portion 171a, and a first cam receiving portion. And a second cam receiving portion 173 disposed 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 storage tube 9 a 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 the first ink containing tube 9a is formed on the inner peripheral surface of the first cam receiving portion 172. The fitting protrusion 174 protrudes radially inward and extends over the entire circumference. A contact surface 175 with which the rear end of the first ink storage tube 9a contacts is formed inside the first cam receiving portion 172. Further, a vent hole 176a for ensuring the 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 air 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 bar 16a is formed at the rear end of the outer peripheral surface of the first cam receiving portion 172 over the entire circumference. Similar to the cam surface 163a, the first cam receiving surface 178 includes a plurality of inclined surfaces. The cam surface 163a and the first cam receiving surface 178 are configured such that the first cam receiving surface 178 receives axial and circumferential forces from the cam surface 163a when the knock bar 16a moves forward. For this reason, when the cam surface 163a presses the first cam receiving surface 178 by the advancement of the knock bar 16a, the rotor 17a rotates in the circumferential direction by a circumferential force. On the other hand, the protrusion 162a of the knock bar 16a abuts against the first rod-shaped portion 157 or the third rod-shaped portion 159 of the outer cam 155a of the inner cylinder 15a, so that circumferential rotation is restricted.

  Four inner cams 179 a and grooves 271 a extending in the axial direction are formed on the outer peripheral surface of the first cam receiving portion 172. 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. When the rotor 17a rotates in the circumferential direction due to the advancement of the knock bar 16a, the inner cam 179a engages or disengages in the axial direction with the outer cam 155a of the inner cylinder 15a, and enters the groove 156 between the outer cams 155a. Is housed in. When the inner cam 179a is received in the groove 156 between the outer cams 155a, the outer cam 155a is received in the groove 271a between the inner cams 179a. That is, the inner cylinder 15a and the rotor 17a are configured to engage with each other in the axial direction or to release the engagement when the rotor 17a rotates in the circumferential direction by the advancement of the knock bar 16a.

  Four cam projections 272 that protrude radially outward and extend in the axial direction are formed on the outer peripheral surface of the second cam receiving portion 173. 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 a second knock member 6a described later is formed at the rear end of the cam projection 272. As can be seen from FIG. 7A, the circumferential position of the cam protrusion 272 is equal to 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 to be formed is formed over the entire circumference. The rear end of the second knock member 6a and the pressing surface 274 are configured to receive axial and radial forces from each other when in contact.

  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 includes 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 is fitted with the second ink containing tube 12a. As a result, the second ink storage tube 12a is fixed to the second knock member 6a. The main body 61a is formed with an urging surface 64a with which a later-described second spring 22a abuts. As shown in FIG. 1 (a), the operation portion 63a protrudes radially outward from the shaft tube 2a in the assembled state of the writing instrument 1a, so that it can be operated with a finger.

  A pressing projection 65a is formed on the bottom surface of the main body 61a. As shown in FIG. 2A, the pressing protrusion 65a protrudes inward in the radial direction of the shaft tube 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 the second cam receiving surface 273 receives axial and circumferential forces from the cam surface 66a when the second knock member 6a moves forward. For this reason, when the cam surface 66a presses the second cam receiving surface 273 by the advancement of the second knock member 6a, the rotor 17a rotates in the circumferential direction by a circumferential force. On the other hand, since the operation part 63a contacts the side wall of the sliding hole 81a of the rear barrel 8a, the second knock member 6a is restricted from rotating in the circumferential direction.

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

  FIGS. 9A and 9B are perspective views of the spacer 18a, respectively. The spacer 18a has a cylindrical portion 181 formed on the front side, and four fitting portions 182 extending rearward from the cylindrical portion 181. Each fitting part 182 is formed with a recess 183 extending in the longitudinal direction. The recesses 183 are fitted with the projections 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 cylindrical part 181 has a cylindrical shape, and four through holes are formed in the cylindrical part 181. A first through hole 184a is formed at the center of the cylindrical portion 181. Two second through holes 185a and a third through hole 186 are formed along the circumferential direction of the cylindrical portion 181 so as to surround the first through hole 184a. The 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 storage 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 storage 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 disposed between the rear end of the pipe member 19a and the biasing surface 177 of the rotor 17a so as to surround the first ink containing tube 9a in the circumferential direction, and the rotor 17a and thus the first writing body. 3a is urged backward. The second spring 22a is disposed between the rear end of the cylindrical 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. The member 6a and the second cursive body 4a are urged backward.

  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 part 201, a contact part 202, a connection part 203, and a contact part 204 from the rear end toward the front end. The attachment 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 abutting portion 202 has a rectangular parallelepiped shape, and abuts against the cylindrical portion 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. As a result, it is possible to avoid the transmission member 20 from occupying a large space in the shaft cylinder 2a. In addition, when a writing instrument is provided with four 2nd writing bodies and a 2nd knock member, a contact part may be comprised so that a 1st writing body may be surrounded over the whole circumferential direction. The contact surface 205 of the contact portion 204 that contacts the cam surface 66a of the second knock member 6a is configured to receive axial and radial forces from the cam surface 66a during contact. For this reason, when the cam surface 66a contacts the contact surface 205, the contact portion 204 is pressed radially inward by a radial force.

  Hereinafter, the principle that the first writing body 3a and the second writing body 4a protrude from the front end of the shaft cylinder 2a, and the protrusion 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 released by the above will be described in detail.

  11 (a) and 11 (b) are respectively a partial front sectional view of the multi-core writing instrument 1a along line BB in FIG. 1 (b) when the first writing body 3a protrudes, It is the fragmentary front sectional view of the multi-core type writing instrument 1a along the BB line of FIG.1 (b) when the 2nd writing body 4a of this protrudes.

  First, the principle that the first writing body 3a protrudes from the front end of the shaft cylinder 2a will be described.

  In the immersed state, the inner cam 179a of the rotor 17a is accommodated in the groove 156 between the outer cams 155a of the inner cylinder 15a. When the knock bar 16a is advanced against the urging force of the first spring 21a from this state, the cam surface 163a of the knock bar 16a comes into contact with the first cam receiving surface 178 of the rotor 17a, and the rotor 17a is moved to the knock bar. Advance with 16a. At this time, the knock bar 16a and the rotor 17a receive axial and circumferential forces via the cam surface 163a and the first cam receiving surface 178. Thereafter, 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 circumferential restriction of the rotor 17a is released. Rotates counterclockwise when viewed from the front. On the other hand, the knock bar 16a does not rotate in the circumferential direction because the protrusion 162a abuts against 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 bar 16a is released in this state, the knock bar 16a and the rotor 17a are moved backward 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 is engaged with the front end of the second rod-shaped portion 158 of the outer cam 155a of the inner cylinder 15a in the axial direction, and the third rod-shaped portion 159 and the circumferential direction. Engage with. Since the engagement prevents the rotor 17a from moving backward, the first writing body 3a fixed to the rotor 17a is maintained in a protruding state from the front end of the shaft cylinder 2a.

  Hereinafter, the principle by which the protrusion of the first cursive 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 bar 16a is advanced against the urging force of the first spring 21a from this state, the cam surface 163a of the knock bar 16a comes into contact with the first cam receiving surface 178 of the rotor 17a, and the rotor 17a is moved to the knock bar. Advance with 16a. At this time, the knock bar 16a and the rotor 17a receive axial and circumferential forces via the cam surface 163a and the first cam receiving surface 178. Thereafter, 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 circumferential restriction of the rotor 17a is released. Rotates counterclockwise when viewed from the front. On the other hand, the knock bar 16a does not rotate in the circumferential direction because the protrusion 162a abuts against 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 bar 16a is released in this state, the knock bar 16a and the rotor 17a are retracted by the urging force of the first spring 21a, and the inner cam 179a rotated in the circumferential direction is accommodated in the groove 156 between the outer cams 155a. . At this time, since the first writing body 3a fixed to the rotor 17a also moves backward, the protrusion of the first writing body 3a is released.

  Hereinafter, the principle by which the protrusion of the first cursive 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 behind the cam protrusion 272 of the rotor 17a, and the circumferential position of the two cam protrusions 272 out of the four. Is equal to the pressing protrusion 65a.

  When the second knock member 6a is advanced from this state against the urging force of the second spring 22a, the cam surface 66a of the second knock member 6a comes into contact with the second cam receiving surface 273 of the rotor 17a, and the rotor 17a moves forward together with the second knock member 6a. At this time, the second knock member 6a and the rotor 17a receive axial and circumferential forces from each other via the cam surface 66a and the second cam receiving surface 273. Thereafter, 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 circumferential restriction of the rotor 17a is released. Rotates counterclockwise when viewed from the front. On the other hand, the second knock member 6a does not rotate in the circumferential direction because the rotation in the circumferential direction is restricted by the operation portion 63a coming into contact with the side wall of the sliding hole 81a of the rear barrel 8a. The inner cam 179a rotated in the circumferential direction is accommodated 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 are retracted, the first writing body 3a fixed to the rotor 17a is also retracted, and the protrusion of the first writing body 3a is released.

  Hereinafter, the principle by which the second writing body 4a protrudes from the front end of the shaft cylinder 2a will be described.

  In the immersed state, the operation 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 advanced against the urging force of the second spring 22a. Thereafter, 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 operation portion 63a of the second knock member 6a falls inward in the radial direction.

  When the second knock member 6a is released in this state, as shown in FIG. 11 (b), the rear end of the second knock member 6a is aligned with the engaging surface 154 of the inner cylinder 15a by the urging force of the second spring 22a. Engage in the direction. Since this engagement prevents the second knock member 6a from moving backward, the second writing body 4a fixed to the second knock member 6a protrudes from the front end of the shaft cylinder 2a.

  Hereinafter, the principle by which the protrusion of the second cursive 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 behind the rear end of the second knock member 6a.

  When the knock bar 16a is advanced against the urging force of the first spring 21a from this state, the cam surface 163a of the knock bar 16a comes into contact with the first cam receiving surface 178 of the rotor 17a, and the rotor 17a is moved to the knock bar. Advance with 16a. Thereafter, 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 radially outward force from the pressing surface 274. The engagement is released. Thereafter, since the second knock member 6a is retracted by the urging force of the second spring 22a, 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 by which the protrusion 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 that does not protrude is located behind the contact surface 205 of the transmission member 20.

  When the second knock member 6a of the second cursive body 4a that does not protrude is advanced from this state against the urging force of the second spring 22a, the cam surface 66a of the second knock member 6a contacts the contact surface of the transmission member 20. 205 is contacted. At this time, since the contact surface 205 receives a force radially inward from the cam surface 66a, the contact portion 204 moves in the radial direction, and the second knock member 6a of the second writing 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. Thereafter, since the second knock member 6a is retracted by the urging force of the second spring 22a, 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, with reference to FIGS. 12-22, the multi-core type writing instrument which concerns on 2nd Embodiment of this invention is demonstrated.

  Initially, with reference to FIGS. 12-14, the structure and operation | movement of the multi-core type writing instrument which concerns on 2nd Embodiment of this invention are demonstrated easily.

  12 (a) and 12 (b) 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 respectively a front sectional view of the multi-core writing instrument 1b along the line K1-K1 in FIG. 12B and a line J1-J1 in FIG. 12A. It is side surface sectional drawing of the multi-core type writing instrument 1b. 14A to 14C are plan sectional views of the multi-core writing instrument 1b taken along the lines L1-L1, M1-M1, and N1-N1 of FIG. 13B, respectively.

  A multi-core writing instrument 1b (hereinafter simply referred to as “writing instrument 1b”) includes a shaft cylinder 2b, a first writing body 3b and a second writing body 4b disposed in the shaft cylinder 2b, and a first writing body 3b. The 1st knock member 5b arrange | positioned at the rear end and the 2nd knock member 6b arrange | positioned at the rear end of the 2nd writing body 4b are provided. In the present specification, the tip, that is, the pen tip side of the writing instrument 1b 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. It is defined as the “back” side of 1b. Also, regarding the component parts of the writing instrument 1b, in the assembled state of the writing instrument 1b, the pen tip side of the writing instrument 1b is defined as the “front” side of the component part, and the pen tip of the writing instrument 1b is 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 in the shaft cylinder 2b at the center in the radial direction of the shaft cylinder 2b, and the second writing body 4b is disposed in the shaft cylinder 2b on the outer side in the radial direction of the shaft cylinder 2b than the first writing body 3b. Arranged. The 1st writing body 3b and the 2nd writing body 4b are located on the same straight line in the radial direction of the axial cylinder 2b.

  The first knock member 5b is configured to selectively protrude the first writing body 3b from the front end of the shaft cylinder 2b. The second knock member 6b is configured to selectively project the second writing body 4b from the front end of the shaft cylinder 2b. Specifically, when the first knock member 5b is operated, the first writing body 3b protrudes, and when the second knock member 6b is operated, the second writing body 4b protrudes. The pen tip of the second writing body 4b moves radially inward along the inner surface of the shaft cylinder 2b and protrudes from the front end of the shaft cylinder 2b. Thus, writing can be performed by selectively using one of the three cursive letters.

  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 cursive body 4b is released by the operation of the first knock member 5b or the second knock member 6b of the cursive body that does not protrude. Therefore, since the protrusions of the first writing body 3b and the second writing body 4b can be released by operating any one knock member, the operability of the writing instrument 1b is greatly 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 cylinder 7b and a rear cylinder 8b disposed rearward of the front cylinder 7b. The front barrel 7b and the rear barrel 8b are connected via a spacer 18b described later. The front shaft cylinder 7b and the rear shaft cylinder 8b may be directly connected by press fitting or the like as in the first embodiment.

  FIGS. 15A to 15C are a front view, a side view, and a side cross-sectional view of the rear barrel 8b taken along line OO in FIG. 15A, respectively. 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 are formed at the rear end of the rear cylinder 8b to be fitted to an inner cylinder 15b described later.

  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 are provided. The first chip 11b is connected to the first ink containing tube 9b through the first joint 10b. The second chip 14b is connected to the second ink storage tube 12b through the second joint 13b.

  The first ink storage tube 9b and the two second ink storage tubes 12b typically store different colors of ink. By disposing the first knock member 5b behind the second knock member 6b, the length of the first ink storage tube 9b can be made longer than that of the second ink storage tube 12b. As a result, the ink filling amount of the first ink containing tube 9b can be made larger than the filling amount of the second ink containing tube 12b. For this reason, for example, the black ink which is generally used frequently is stored in the first ink storage tube 9b, thereby extending the life of the writing instrument 1b or reducing the replacement frequency of the writing body. In order to obtain the same effect, the radial length of the first ink storage tube 9b is set so that the ink filling amount of the first ink storage tube 9b is larger than the filling amount of the second ink storage tube 12b. It may be longer than the second ink storage tube 12b.

  The first knock member 5b includes an inner cylinder 15b fixed to the rear cylinder 8b, a knock bar 16b disposed in the inner cylinder 15b and protruding rearward from the inner cylinder 15b, and disposed in front of the knock bar 16b. And a rotor 17b. Although mentioned later in detail, the 1st writing body 3b can be made to protrude from the front end of the axial cylinder 2b by pressing the knock stick 16b and rotating the rotor 17b.

  16A to 16D are a front view, a side view, a perspective view, and a side sectional view of the inner cylinder 15b taken along line P1-P1 in FIG. 16A, respectively. The inner cylinder 15b has a clip part 252b and an insertion part 253b. The clip portion 252b has an elongated shape, and extends in the substantially axial direction outside the shaft tube 2b when the inner tube 15b is fixed to the shaft tube 2b. A ball portion 254b protruding inward in the radial direction of the shaft tube 2b is provided at 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 part 253b has a hollow and substantially cylindrical shape. The rear portion of the insertion portion 253b is exposed from the shaft tube 2b when the inner tube 15b is fixed to the shaft tube 2b. A through hole 256b extending in the axial direction is formed in the rear portion of the insertion portion 253b, and the knock bar 16b protrudes rearward from the inner cylinder 15b through the through hole 256b.

  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 on the outer peripheral surface of the insertion portion 253b. The rail 257b protrudes 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 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. In addition, when the second knock member 6b receives a circumferential force, the second knock member 6b comes into contact with the rail 257b that forms 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 along the line QQ in FIG. The insertion portion 253b has two outer cams 155b on the inner peripheral surface. The two outer cams 155b are spaced apart from each other in the circumferential direction 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 spaced apart in the circumferential direction and are positioned on the same straight line in the radial direction. The outer cam 155b and the thick part 351b are alternately arranged so as to be separated from each other in the circumferential direction. In addition, the outer cam 155b and the thick portion 351b have the same radial thickness. As a result, two first concave portions 352 and two second concave portions 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. The second recess 353 communicates with the sliding hole 259b. The 1st recessed part 352 and the 2nd recessed part 353 accommodate the protrusion 162b of the knock bar 16b mentioned later. Moreover, the 1st recessed part 352 and the 2nd recessed part 353 accommodate the inner cam 179b of the rotor 17b mentioned later in the immersion state of the 1st writing body 3b, as FIG. 14 (a) shows.

  The inner cylinder 15b may be integrated with the rear axle cylinder 8b. Moreover, the inner cylinder 15b does not need to have the clip part 252b like 1st Embodiment.

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

  The knock bar 16b has four protrusions 162b on the outer peripheral surface that protrude radially outward 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 axial direction in the first concave portion 352 or the second concave portion 353 of the inner cylinder 15b when the knock bar 16b moves in the axial direction. That is, the knock bar 16b and the inner cylinder 15b are configured to restrict rotation of the knock bar 16b in the circumferential direction. Further, a cam surface 163b is formed over the entire circumference at the front end of the knock bar 16b. The cam surface 163b is composed of a plurality of inclined surfaces.

  FIGS. 19A to 19D are a front view, a plan view, a perspective view, and a cross-sectional view of the rotor 17b taken along line S1-S1 in FIG. 19A, respectively. The rotor 17b has a hollow, substantially cylindrical shape, and includes an insertion portion 171b that is inserted into the accommodation space 164b of the knock bar 16b, and a cam receiving portion 275b that is disposed 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 storage tube 9b is press-fitted into the cam receiving portion 275b. Thus, the first ink storage 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 contacts is formed inside the cam receiving portion 275b. Further, a vent hole 176b for ensuring the 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 abutting 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 grooves 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. A cam receiving surface 278b that interacts with the cam surface 163b of the knock bar 16b is formed at the front end of the inner cam 179b. The cam surface 163b and the cam receiving surface 278b are configured such that when the knock bar 16b moves forward, the cam receiving surface 278b receives axial and circumferential forces from the cam surface 163b. For this reason, when the cam surface 163b presses the cam receiving surface 278b by the advancement of the knock bar 16b, the rotor 17b rotates in the circumferential direction by a circumferential force. On the other hand, since the protrusion 162b contacts the outer cam 155b or the thick part 351b of the inner cylinder 15b, the knock bar 16b is restricted from rotating in the circumferential direction.

  When the inner cam 179b is accommodated in the first recess 352 or the second recess 353 of the inner cylinder 15b as shown in FIG. 14A, the rotor 17b rotates in the circumferential direction by the advancement of the knock bar 16b. Then, it engages with the thick part 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 advancement of the knock bar 16b, the inner cam 179b receives further circumferential force from the outer cam 155b. As a result, the engagement with the thick portion 351b is released and the first concave portion 352 or the second concave portion 353 is accommodated. When the inner cam 179b is accommodated in the first recess 352 or the second recess 353, the outer cam 155b and the thick portion 351b are accommodated in the groove 271b between the inner cams 179b. In other words, the inner cylinder 15b and the rotor 17b are configured to engage or disengage from each other in the axial direction when the rotor 17b rotates in the circumferential direction by the advancement of the knock bar 16b.

  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 main body portion 61b extending in the front-rear direction, a fitting portion 62b formed in front of the main body portion 61b, an operation portion 63b formed at the rear portion of the main body portion 61b, and a main body portion 61b. And contact portions 67b formed on both sides. As shown in FIG. 13A, the fitting portion 62b is fitted 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, the operation portion 63b protrudes radially outward from the shaft tube 2b in the assembled state of the writing instrument 1b, so that it can be operated with a finger.

  The main body portion 61b is formed with a biasing surface 64b with which a later-described second spring 22b comes into contact. 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 main body 61b. The first contact surface 68b is configured to receive axial and radial forces 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 protrudes radially inward of the shaft tube 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 such that when the second knock member 6b moves forward, the cam receiving surface 278b receives axial and circumferential forces from the cam surface 66b. For this reason, when the cam surface 66b presses the cam receiving surface 278b by the advancement of the second knock member 6b, the rotor 17b rotates in the circumferential direction by a circumferential force. On the other hand, since the operation part 63b contacts the rail 257b of the inner cylinder 15b, the rotation of the second knock member 6b in the circumferential direction is restricted.

  As shown in FIG. 14A, in the assembled state of the writing instrument 1b, the contact portion 67b extends in the substantially circumferential direction of the shaft tube 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 in a range of about 180 ° of the entire circumference (360 °) of the shaft cylinder 2b.

  At the front end of the contact portion 67b, the second knock of the second cursive body 4b protruding when the second cursive body 4b is released by the operation of the second knock member 6b of the second cursive body 4b not projecting. Two pressing surfaces 69b for pressing the member 6b are formed. The second end of the second cursive body 4b that does not project is released from the rear end of the contact portion 67b when the projecting of the second cursive body 4b is released by operating the second knock member 6b of the second cursive body 4b that does not project. 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 axial and radial forces from each other during 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-fit portion 187b press-fitted into the front shaft cylinder 7b, the second press-fit portion 188b press-fitted into the rear shaft cylinder 8b, and the first press-fit portion 187b and the second press-fit portion 188b. The exposed portion 189b and three spring guides (first spring guide 281b and second spring guide 282b) extending rearward from the second press-fit portion 188b. The first press-fit portion 187b and the second press-fit portion 188b may be fixed to the front shaft cylinder 7b and the rear shaft cylinder 8b by bonding or screwing, respectively.

  The first press-fit portion 187b has a hollow substantially cylindrical shape, and the second press-fit portion 188b has a substantially columnar shape. The rear surface of the second press-fit 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 constitutes the outer peripheral surface of the writing instrument 1b together with the front shaft cylinder 7b and the rear shaft cylinder 8b, as shown in FIG.

  Three through holes are formed in the exposed portion 189b and the second press-fit portion 188b. A first through hole 184b is formed at the center in the radial direction, and two second through holes 185b are formed at the outer side in the radial direction than the first through hole 184b. The first through hole 184b and the two second through holes 185b are positioned on the same straight line in the radial direction. The first spring guide 281b is formed so as 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 storage 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 storage 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 between the rear surface of the second press-fit portion 188b of the spacer 18b and the front end of the pipe member 19b so as to surround the first ink containing tube 9b in the circumferential direction, and the pipe member 19b and thus the rotor 17b. The first cursive body 3b is urged backward. The second spring 22b is disposed between the rear surface of the second press-fit portion 188b of the spacer 18b and the biasing 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 the second cursive body 4b are urged backward. 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 shaft cylinder 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 released by the above will be described in detail.

  22 (a) and 22 (b) are respectively a partial front sectional view of the multi-core writing instrument 1b along the line K2-K2 in FIG. 12 (b) when the first writing body 3b protrudes, It is the fragmentary front sectional view of the multi-core type writing instrument 1b along the K2-K2 line | wire of FIG.12 (b) when the 2nd writing body 4b of this protrudes.

  First, the principle of the first writing body 3b protruding from the front end of the shaft cylinder 2b will be described.

  In the immersed state, as shown in FIG. 14A, the inner cam 179b of the rotor 17b is accommodated in the first recess 352 or the second recess 353 of the inner cylinder 15b. When the knock bar 16b is moved forward against the biasing force of the first spring 21b from this state, the cam surface 163b of the knock bar 16b comes into contact with the cam receiving surface 278b of the rotor 17b, and the rotor 17b together with the knock bar 16b. Advance. At this time, the knock bar 16b and the rotor 17b receive axial and circumferential forces from each other via the cam surface 163b and the cam receiving surface 278b. Thereafter, when the rear end of the inner cam 179b exceeds the front end of the thick portion 351b, the circumferential restriction of the rotor 17b is released, so that the rotor 17b is circumferentially (reversely viewed from the front) by the circumferential force. Rotate clockwise. On the other hand, the knock bar 16b does not rotate in the circumferential direction because the protrusion 162b is in contact with the outer cam 155b or the thick portion 351b of the inner cylinder 15b and thus the circumferential rotation is restricted.

  When the knock bar 16b is released in this state, the knock bar 16b and the rotor 17b are moved backward 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 engages with the front end of the thick portion 351b of the inner cylinder 15b in the axial direction. Since the engagement prevents the rotor 17b from retreating, the first writing body 3b fixed to the rotor 17b is maintained in a protruding state from the front end of the shaft cylinder 2b.

  Hereinafter, the principle by which the protrusion of the first cursive 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 bar 16b is moved forward against the biasing force of the first spring 21b from this state, the cam surface 163b of the knock bar 16b comes into contact with the cam receiving surface 278b of the rotor 17b, and the rotor 17b together with the knock bar 16b. Advance. At this time, the knock bar 16b and the rotor 17b receive axial and circumferential forces from each other via the cam surface 163b and the cam receiving surface 278b. As a result, the axial engagement between the inner cam 179b of the rotor 17b and the thick portion 351b of the inner cylinder 15b is released, so that the rotor 17b is rotated in the circumferential direction (counterclockwise as viewed from the front) by the circumferential force. Around). On the other hand, the knock bar 16b does not rotate in the circumferential direction because the protrusion 162b is in contact with the outer cam 155b or the thick portion 351b of the inner cylinder 15b and thus the circumferential rotation is restricted.

  When the knock bar 16b is released in this state, the knock bar 16b and the rotor 17b are retracted by the biasing 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 the 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, since the first writing body 3b fixed to the rotor 17b also moves backward, the protrusion of the first writing body 3b is released.

  Hereinafter, the principle by which the protrusion of the first cursive 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 behind the inner cam 179b of the rotor 17b, and the circumferential position of two of the four inner cams 179b. Is equal to the pressing protrusion 65b.

  When the second knock member 6b is advanced from this state against the urging force of the second spring 22b, the cam surface 66b of the second knock member 6b comes into contact with the cam receiving surface 278b of the rotor 17b, and the rotor 17b is It advances with the 2nd knock member 6b. At this time, the second knock member 6b and the rotor 17b receive axial and circumferential forces from each other via the cam surface 66b and the cam receiving surface 278b. As a result, the axial engagement between the inner cam 179b of the rotor 17b and the thick portion 351b of the inner cylinder 15b is released, so that the rotor 17b is rotated in the circumferential direction (counterclockwise as viewed from the front) by the circumferential force. Around). On the other hand, the second knock member 6b does not rotate in the circumferential direction because the rotation in the circumferential direction is restricted by the operation portion 63b coming into contact with 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 accommodated 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 bar 16b are retracted, the first writing body 3b fixed to the rotor 17b is also retracted, and the protrusion of the first writing body 3b is released.

  Hereinafter, the principle that the second writing body 4b protrudes from the front end of the shaft cylinder 2b will be described.

  In the immersed state, the operation 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 urging force of the second spring 22b. Thereafter, when the rear end of the second knock member 6b exceeds the front end of the inner cylinder 15b, the operation 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 engaged with the front end of the inner cylinder 15b in the axial direction by the urging force of the second spring 22b as shown in FIG. 22 (b). Match. Since this engagement prevents the second knock member 6b from moving backward, the second writing body 4b fixed to the second knock member 6b protrudes from the front end of the shaft cylinder 2b.

  Hereinafter, the principle by which 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 behind the first contact surface 68b of the second knock member 6b.

  When the knock bar 16b is moved forward against the biasing force of the first spring 21b from this state, the cam surface 163b of the knock bar 16b comes into contact with the cam receiving surface 278b of the rotor 17b, and the rotor 17b together with the knock bar 16b. Advance. Thereafter, 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 radially outward force from the front surface of the rotor 17b. The engagement between the second knock member 6b and the inner cylinder 15b is released. Thereafter, since the second knock member 6b is retracted by the biasing force of the second spring 22b, the second writing body 4b fixed to the second knock member 6b is also retracted, and the protrusion of the second writing body 4b is released. .

  Hereinafter, the principle by which the protrusion 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 knock member 6b of the second writing body 4b that does not protrude is positioned rearward of the second contact surface 70b of the second knock member 6b of the protruding second writing body 4b. The pressing surface 69b and the second contact surface 70b partially overlap in the circumferential direction.

  If the second knock member 6b of the second cursive body 4b that does not project is advanced from this state against the urging force of the second spring 22b, the second knock member 6b of the second cursive body 4b that does not project is pressed. The surface 69b comes into contact with the second contact surface 70b of the second knock member 6b of the protruding second writing body 4b. At this time, since the second contact surface 70b receives a radially outward force from the pressing surface 69b, the engagement between the second knock member 6b and the inner cylinder 15b is released. Thereafter, since the second knock member 6b is retracted by the biasing force of the second spring 22b, the second writing body 4b fixed to the second knock member 6b is also retracted, and the protrusion of the second writing body 4b is released. .

  Hereinafter, with reference to FIGS. 23-33, the multi-core type writing instrument which concerns on 3rd Embodiment of this invention is demonstrated. The third embodiment is different from the second embodiment in that there are three second cursive bodies, and the functions and configurations of the component parts are the same as those of the second embodiment.

  Initially, with reference to FIGS. 23-25, the structure and operation | movement of the multi-core type writing instrument which concerns on 3rd Embodiment of this invention are demonstrated easily.

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

  A multi-core writing instrument 1c (hereinafter simply referred to as "writing instrument 1c") includes a shaft cylinder 2c, a first writing body 3c and a second writing body 4c disposed in the shaft cylinder 2c, and a first writing body 3c. The first knock member 5c disposed at the rear end and the second knock member 6c disposed at the rear end of the second writing body 4c are provided. In the present specification, the tip, that is, the pen tip side of the writing instrument 1c is defined as the “front” side of the writing instrument 1c, and the side opposite to the pen tip of the writing instrument 1c along the axial direction (longitudinal direction) of the writing instrument 1c. It is defined as the “rear” side of 1c. In addition, regarding the component parts of the writing instrument 1c, in the assembled state of the writing instrument 1c, the pen tip side of the writing instrument 1c is defined as the “front” side of the component part, and the pen tip of the writing instrument 1c is 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 cursive body 3c is one ballpoint pen, and the second cursive body 4c is three ballpoint pens. The first writing body 3c is disposed in the shaft cylinder 2c at the central portion in the radial direction of the shaft cylinder 2c, and the second writing body 4c is disposed in the shaft cylinder 2c on the outer side in the radial direction of the shaft cylinder 2c than the first writing body 3c. 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 protrude the first writing body 3c from the front end of the shaft cylinder 2c. The second knock member 6c is configured to selectively protrude the second writing body 4c from the front end of the shaft cylinder 2c. Specifically, when the first knock member 5c is operated, the first writing body 3c protrudes, and when the second knock member 6c is operated, the second writing body 4c protrudes. The pen tip of the second writing body 4c moves radially inward along the inner surface of the shaft cylinder 2c and protrudes from the front end of the shaft cylinder 2c. Thus, writing can be performed by selectively using one of the four cursive letters.

  The protrusion of the first cursive 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, since the protrusions of the first writing body 3c and the second writing body 4c can be released by operating any one knock member, the operability of the writing instrument 1c is greatly improved.

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

  As shown in FIG. 23, the shaft tube 2c includes a front shaft tube 7c and a rear shaft tube 8c disposed rearward of the front shaft tube 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 a front view, a side view, and a side cross-sectional view of the rear barrel 8c taken along line O2-O2 in FIG. 26A, respectively. 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. At the rear end of the rear cylinder 8c, a fitting hole 84c and a fitting groove 85c are formed for fitting with an inner cylinder 15c described later.

  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 are provided. The first chip 11c is connected to the first ink storage tube 9c through the first joint 10c. The second tip 14c is connected to the second ink containing tube 12c through the second joint 13c.

  The first ink storage tube 9c and the three second ink storage tubes 12c typically store different colors of ink. By disposing the first knock member 5c behind the second knock member 6c, the length of the first ink storage tube 9c can be made longer than that of the second ink storage 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. For this reason, for example, by storing black ink, which is generally frequently used, in the first ink storage tube 9c, the life of the writing instrument 1c can be extended or the replacement frequency of the writing body can be reduced. In order to obtain the same effect, the radial length of the first ink storage tube 9c is set so that the ink filling amount of the first ink storage tube 9c is larger than the filling amount of the second ink storage tube 12c. It may be longer than the second ink storage tube 12c.

  The first knock member 5c includes an inner cylinder 15c fixed to the rear shaft cylinder 8c, a knock bar 16c disposed in the inner cylinder 15c and protruding rearward from the inner cylinder 15c, and disposed in front of the knock bar 16c. And a rotor 17c. Although mentioned later in detail, the 1st writing body 3c can be made to appear and disappear from the front end of the axial cylinder 2c by pressing the knock stick 16c and rotating the rotor 17c.

  27A to 27D are a front view, a side view, a perspective view, and a side cross-sectional view of the inner cylinder 15c taken along line P2-P2 of FIG. 27A, respectively. The inner cylinder 15c has a clip part 252c and an insertion part 253c. The clip portion 252c has an elongated shape, and extends in a substantially axial direction outside the shaft tube 2c when the inner tube 15c is fixed to the shaft tube 2c. A ball portion 254c that protrudes inward in the radial direction of the shaft tube 2c is provided at 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 part 253c has a hollow substantially cylindrical shape. The rear portion of the insertion portion 253c is exposed from the shaft tube 2c when the inner tube 15c is fixed to the shaft tube 2c. A through hole 256c extending in the axial direction is formed in the rear portion of the insertion portion 253c, and the knock bar 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 protrudes 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. Further, when the second knock member 6c receives a circumferential force, the second knock member 6c comes into contact with the rail 257c that forms the side wall of the sliding hole 259c.

  FIG. 28 is an enlarged cross-sectional view of the insertion portion 253c of the inner cylinder 15b along the line Q2-Q2 in FIG. 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 cam 155c and the thick part 351c are spaced apart in the circumferential direction and arranged alternately. In addition, the outer cam 155c and the thick portion 351c have the same thickness in the radial direction. Three concave portions 354 are formed between the outer cam 155c and the thick portion 351c.

  Recess 354 accommodates protrusion 162c of knock bar 16c, which will be described later. Moreover, the recessed part 354 accommodates the inner cam 179c of the rotor 17c mentioned later in the immersion state of the 1st writing body 3c, as FIG. 25 (a) shows.

  The inner cylinder 15c may be integrated with the rear axle cylinder 8c. Moreover, the inner cylinder 15c does not need to have the clip part 252c like 1st Embodiment.

  29A to 29D are a front view, a bottom view, a perspective view, and a cross-sectional view of the knock bar 16c taken along line R2-R2 in FIG. 29A, respectively. The knock bar 16c has a substantially cylindrical shape. An accommodation space 164c for partially accommodating the rotor 17c is formed inside the knock bar 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 protrusions 162c projecting radially outward and extending in the axial direction on the outer peripheral surface. The three protrusions 162c are arranged at equal intervals in the circumferential direction. Each protrusion 162c is configured to slide in the axial direction in the recess 354 of the inner cylinder 15c when the knock bar 16c moves in the axial direction. That is, the knock bar 16c and the inner cylinder 15c are configured to restrict rotation of the knock bar 16c in the circumferential direction. A cam surface 163c is formed on the entire front end of the knock bar 16c. The cam surface 163c is composed of a plurality of inclined surfaces.

  30A to 30D are a front view, a plan view, a perspective view, and a cross-sectional view of the rotor 17c taken along line S2-S2 in FIG. 30A, respectively. The rotor 17c has a hollow, substantially cylindrical shape, and includes an insertion portion 171c that is inserted into the accommodation space 164c of the knock bar 16c, and a cam receiving portion 275c that is disposed 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 storage tube 9c is press-fitted into the cam receiving portion 275c. Thus, 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 storage tube 9c contacts is formed inside the cam receiving portion 275c. Further, a vent hole 176c for ensuring the ventilation of the first ink storage 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 abutting surface 277c with which the rear end of the pipe member 19c abuts is formed inside the cam receiving portion 275c.

  Three inner cams 179c and grooves 271c extending in the axial direction are formed on the outer peripheral surface of the cam receiving portion 275c. 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 bar 16c is formed at the front end of the inner cam 179c. The cam surface 163c and the cam receiving surface 278c are configured such that the cam receiving surface 278c receives axial and circumferential forces from the cam surface 163c when the knock bar 16c moves forward. For this reason, when the cam surface 163c presses the cam receiving surface 278c by the advancement of the knock bar 16c, the rotor 17c rotates in the circumferential direction by a circumferential force. On the other hand, since the protrusion 162c contacts the outer cam 155c of the inner cylinder 15c, the knock bar 16c is restricted from rotating in the circumferential direction.

  When the inner cam 179c is housed in the recess 354 of the inner cylinder 15c as shown in FIG. 25 (a), the rotor 17c rotates in the circumferential direction by the advancement of the knock bar 16c. Engage with the thick part 351c in the axial direction. Further, when the inner cam 179c is engaged with the thick portion 351c in the axial direction, when the rotor 17c rotates in the circumferential direction by the advancement of the knock bar 16c, the engagement with the thick portion 351c is released, Thereafter, the outer cam 155c receives a further circumferential force and is accommodated in the recess 354. When the inner cam 179c is accommodated in the recess 354, the outer cam 155c and the thick part 351c are accommodated in the groove 271c between the inner cams 179c. In other words, the inner cylinder 15c and the rotor 17c are configured to engage or disengage from each other in the axial direction when the rotor 17c rotates in the circumferential direction by the advancement of the knock bar 16c.

  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 main body part 61c extending in the front-rear direction, a fitting part 62c formed in front of the main body part 61c, an operation part 63c formed in the rear part of the main body part 61b, and a main body part 61c. And contact portions 67c formed on both sides of each other. As shown in FIG. 24B, the fitting portion 62c is fitted with the second ink containing tube 12c. Thus, the second ink storage tube 12c is fixed to the second knock member 6c. As shown in FIG. 23, the operation part 63c protrudes radially outward from the shaft tube 2c in the assembled state of the writing instrument 1c, and thus can be operated with a finger.

  The main body portion 61c is formed with an urging surface 64c with which a second spring 22c described later comes into contact. Further, 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 main body 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 projection 65c is formed on the bottom surface of the main body 61c. As shown in FIG. 24 (b), the pressing protrusion 65c protrudes radially inward of the shaft tube 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 such that the cam receiving surface 278c receives axial and circumferential forces from the cam surface 66c when the second knock member 6c moves forward. For this reason, when the cam surface 66c presses the cam receiving surface 278c by the advancement of the second knock member 6c, the rotor 17c rotates in the circumferential direction by a circumferential force. On the other hand, since the operation part 63c contacts the rail 257c of the inner cylinder 15c, the rotation of the second knock member 6c in the circumferential direction is restricted.

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

  At the front end of the contact portion 67c, when the protrusion of the second cursive body 4c is released by the operation of the second knock member 6c of the second cursive body 4c that does not protrude, the second knock of the projecting second cursive body 4c is released. Two pressing surfaces 69c for pressing the member 6c are formed. The second end of the second cursive body 4c that does not project is released from the rear end of the contact portion 67c when the projecting of the second cursive body 4c is released by operating the second knock member 6c of the second cursive 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 axial and radial forces from each other during 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 part 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-fit portion 187c press-fitted into the front shaft cylinder 7c, the second press-fit portion 188c press-fitted into the rear shaft cylinder 8c, and the first press-fit portion 187c and the second press-fit 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-fit portion 188c. The first press-fit portion 187c and the second press-fit portion 188c may be fixed to the front shaft cylinder 7c and the rear shaft cylinder 8c by bonding or screwing, respectively.

  The first press-fit portion 187c has a hollow substantially cylindrical shape, and the second press-fit portion 188c has a columnar shape. The rear surface of the second press-fit 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 forms the outer peripheral surface of the writing instrument 1c together with the front shaft cylinder 7c and the rear shaft cylinder 8c, as shown in FIG.

  Four through holes are formed in the exposed portion 189c and the second press-fit portion 188c. A first through hole 184c is formed at the center in the radial direction, and three second through holes 185c are formed on the outer side in the radial direction than the first through hole 184c. 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 so as to partially surround the first through hole 184c in the circumferential direction. The second spring guide 282c is formed so as 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 storage 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 storage 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 disposed between the rear surface of the second press-fit portion 188c of the spacer 18c and the front end of the pipe member 19c so as to surround the first ink containing tube 9c in the circumferential direction, and the pipe member 19c and thus the rotor 17c. The first cursive body 3c is urged backward. The second spring 22c is disposed between the rear surface of the second press-fit 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 the second cursive body 4c are urged backward. 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 protrude from the front end of the shaft cylinder 2c, and the protrusion 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 released by the above will be described in detail.

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

  First, the principle of the first writing body 3c protruding from the front end of the shaft cylinder 2c will be described.

  In the immersed state, as shown in FIG. 25A, the inner cam 179c of the rotor 17c is accommodated in the recess 354 of the inner cylinder 15c. When the knock bar 16c is advanced against the urging force of the first spring 21c from this state, the cam surface 163c of the knock bar 16c comes into contact with the cam receiving surface 278c of the rotor 17c, and the rotor 17c together with the knock bar 16c. Advance. At this time, the knock bar 16c and the rotor 17c receive axial and circumferential forces from each other via the cam surface 163c and the cam receiving surface 278c. Thereafter, when the rear end of the inner cam 179c exceeds the front end of the thick portion 351c, the circumferential restriction of the rotor 17c is released, so that the rotor 17c is circumferentially (reversely viewed from the front) by the circumferential force. Rotate clockwise. On the other hand, the knock bar 16c does not rotate in the circumferential direction because rotation in the circumferential direction is restricted by the protrusion 162c coming into contact with the outer cam 155c of the inner cylinder 15c.

  When the knock bar 16c is released in this state, the knock bar 16c and the rotor 17c are moved backward 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 engages with the front end of the thick portion 351c of the inner cylinder 15c in the axial direction. Since the engagement prevents the rotor 17c from moving backward, the first writing body 3c fixed to the rotor 17c is maintained in a protruding state from the front end of the shaft cylinder 2c.

  Hereinafter, the principle by which the protrusion of the first cursive 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 bar 16c is advanced against the urging force of the first spring 21c from this state, the cam surface 163c of the knock bar 16c comes into contact with the cam receiving surface 278c of the rotor 17c, and the rotor 17c together with the knock bar 16c. Advance. At this time, the knock bar 16c and the rotor 17c receive axial and circumferential forces from each other via the cam surface 163c and the cam receiving surface 278c. As a result, the axial engagement between the inner cam 179c of the rotor 17c and the thick portion 351c of the inner cylinder 15c is released, so that the rotor 17c is rotated in the circumferential direction (counterclockwise as viewed from the front) by the circumferential force. Around). On the other hand, the knock bar 16c does not rotate in the circumferential direction because rotation in the circumferential direction is restricted by the protrusion 162c coming into contact with the outer cam 155c of the inner cylinder 15c.

  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 the force in the direction and is accommodated in the recess 354 of the inner cylinder 15c. At this time, the first writing body 3c fixed to the rotor 17c also moves backward, so that the protrusion of the first writing body 3c is released.

  Hereinafter, the principle by which the protrusion of the first cursive 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 knocking member 6c is located behind the inner cam 179c of the rotor 17c. Further, the inner cam 179c partially overlaps the pressing protrusion 65c in the circumferential direction.

  From this state, when the second knock member 6c is advanced against the urging force of the second spring 22c, the cam surface 66c of the second knock member 6c comes into contact with the cam receiving surface 278c of the rotor 17c, and the rotor 17c is It advances together with the second knock member 6c. At this time, the second knock member 6c and the rotor 17c receive axial and circumferential forces through the cam surface 66c and the cam receiving surface 278c. As a result, the axial engagement between the inner cam 179c of the rotor 17c and the thick portion 351c of the inner cylinder 15c is released, so that the rotor 17c is rotated in the circumferential direction (counterclockwise as viewed from the front) by the circumferential force. Around). On the other hand, the second knock member 6c does not rotate in the circumferential direction because the rotation in the circumferential direction is restricted by the operation portion 63c coming into contact with 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 accommodated in the recess 354 of the inner cylinder 15c. At this time, since the rotor 17c and the knock bar 16c are retracted, the first writing body 3c fixed to the rotor 17c is also retracted, and the protrusion of the first writing body 3c is released.

  Hereinafter, the principle by which the second writing body 4c protrudes from the front end of the shaft cylinder 2c will be described.

  In the immersed 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 advanced against the urging force of the second spring 22c. Thereafter, when the rear end of the second knock member 6c exceeds the front end of the inner cylinder 15c, the operation 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 engaged with the front end of the inner cylinder 15c in the axial direction by the urging force of the second spring 22c. Since this engagement prevents the second knock member 6c from moving backward, the second writing body 4c fixed to the second knock member 6c protrudes from the front end of the shaft cylinder 2c.

  Hereinafter, the principle by which 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 behind the first contact surface 68c of the second knock member 6c.

  When the knock bar 16c is advanced against the urging force of the first spring 21c from this state, the cam surface 163c of the knock bar 16c comes into contact with the cam receiving surface 278c of the rotor 17c, and the rotor 17c together with the knock bar 16c. Advance. Thereafter, when the front surface of the rotor 17c comes into contact with the first contact surface 68c of the second knock member 6c, the first contact surface 68c of the second knock member 6c receives a radially outward force from the front surface of the rotor 17c. The engagement between the second knock member 6c and the inner cylinder 15c is released. Thereafter, since the second knock member 6c is retracted by the urging force of the second spring 22c, the second writing body 4c fixed to the second knock member 6c is also retracted, and the protrusion of the second writing body 4c is released. .

  Hereinafter, the principle by which 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 protrude is positioned rearward of the second contact surface 70c of the second knock member 6c of the protruding second writing body 4c. Further, the pressing surface 69c and the second contact surface 70c partially overlap in the circumferential direction.

  When the second knock member 6c of the second cursive body 4c that does not project is advanced from this state against the urging force of the second spring 22c, the second knock member 6c of the second cursive body 4c that does not project is pressed. The surface 69c comes into contact with the second contact surface 70c of the second knock member 6c of the protruding second writing body 4c. At this time, since the second contact surface 70c receives a radially outward force from the pressing surface 69c, the engagement between the second knock member 6c and the inner cylinder 15c is released. Thereafter, since the second knock member 6c is retracted by the urging force of the second spring 22c, the second writing body 4c fixed to the second knock member 6c is also retracted, and the protrusion of the second writing body 4b is released. .

  The preferred embodiments according to the present invention have been described above, but 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 the ballpoint pen. In this case, by urging the first writing body with two types of springs having different elastic forces, the lead of the mechanical pencil can be extended and the protrusion of the first writing body can be released with the first knock member. it can. Further, 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 cylinder 3a, 3b, 3c 1st writing body 4a, 4b, 4c 2nd writing body 5a, 5b, 5c 1st knock member 6a, 6b, 6c 2nd knock member 66a, 66b, 66c Cam surface 7a, 7b, 7c Front shaft cylinder 8a, 8b, 8c Rear shaft cylinder 9a, 9b, 9c First ink storage tube 10a, 10b, 10c First joint 11a, 11b, 11c First tip 12a, 12b, 12c Second ink Housing pipe 13a, 13b, 13c Second joint 14a, 14b, 14c Second tip 15a, 15b, 15c Inner cylinder 155a, 155b, 155c Outer cam 16a, 16b, 16c Knock bar 162a, 162b, 162c Protrusion 163a, 163b, 163c Cam surface 17a, 17b, 17c Rotor 171a, 171b, 171c Insertion part 178 First cam receiving surface 79a, 179b, 179c Inner cam 272 Cam projection 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 2nd spring

Claims (1)

A barrel,
A first cursive body disposed in the axial cylinder at a central portion in the radial direction of the axial cylinder;
At least two second cursive bodies arranged in the shaft cylinder outside the first cursive body in the radial direction of the shaft cylinder;
A first knock member disposed at a rear end of the first cursive body and configured to selectively protrude the first cursive body from a front end of the shaft cylinder;
A multi-core writing instrument comprising a second knock member disposed at a rear end of the second cursive body and configured to selectively protrude the second cursive body from a front end of the shaft cylinder;
The multi-core writing instrument, wherein the protrusion of the first writing body is released by operating the first knock member.

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