JPH0413160B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a composite writing instrument equipped with a first and second refill, such as two types of sharp pencils with different lead diameters, or a combination of a sharp pencil and a ballpoint pen, and particularly relates to a composite writing instrument equipped with a first and second refill. The present invention relates to an improvement of a composite writing instrument equipped with a cam tube that alternately projects.

[Conventional technology]

Conventionally, this type of compound writing instrument has a sheath that is connected to the rear end of the front outer cylinder and has a sharp pen shaft and a ballpoint pen shaft slidably attached in the axial direction, and a circular shaft portion (sheath shaft portion) of the sheath. a cam barrel that is slidably fitted in an axial sliding groove and connected to the rear ends of the sharp pen shaft and the ballpoint pen shaft, and to which the slider is press-fitted; a rear outer cylinder that is engaged and rotatably connected to the rear end of the front cylinder and slidably in the axial direction;
By rotating the rear outer cylinder, a cam cylinder that rotates together with the rear outer cylinder causes the sharp pen shaft and the ballpoint pen shaft to alternately protrude from the tip of the front outer cylinder via the slider. There is.

[Problems to be solved by the invention]

In such a conventional compound writing instrument, a slider integrated with the rear end of the pen shaft is slidably fitted into a widthwise sliding groove with a small groove width provided in a cylindrical sheath shaft, and the slider is connected to a cam. Since the slider is press-fitted to the cylinder, it becomes easy for the slider to come off the axial sliding groove due to rotational resistance (rotation load) of the cam cylinder, and smooth sliding of the slider due to rotation of the cam cylinder is prevented. Therefore, there was a problem in that the action of alternately protruding the pencil shaft and the ballpoint pen shaft could not be performed smoothly. In addition, since the sheath shaft is formed in a cylindrical shape, the outer cylinder of the writing instrument must be made large in diameter to correspond to the outer diameter of the sheath shaft, which poses the problem of increasing the overall size of the writing instrument. It was hot too. This invention was made to solve the above problems, and the slider can be slid smoothly and stably along the sheath shaft using a cam cylinder that rotates together with the rear outer cylinder. To provide a composite writing instrument in which a slider is difficult to come off from the sheath shaft part during movement, the projecting and retracting operations of a refill are performed smoothly and reliably, and the writing instrument as a whole can be miniaturized.

[Means to solve the problem]

The composite writing instrument according to the present invention has a sheath formed in a flat plate shape, which is removably connected to the rear end of the front outer cylinder, and in which the first and second refills are attached and set so as to be slidable in the axial direction. A hook leg portion that engages with the side surface of the sheath is provided on the rotational load acting side of the rear outer cylinder when the refill of the slider that is integrally connected to the rear ends of the first and second refills and slides into contact with the sheath is protruded. It is something that

[Effect]

In the composite writing instrument of the present invention, when the rear outer cylinder is rotated in one direction, the cam cylinder rotates together with the rear outer cylinder, and one of the first and second sliders moves forward with the cam cylinder. The other moves backward, and in particular, the rotational load of the cam, etc. acting on the slider on the forward side is transmitted to the sheath via the hook leg, and the hook leg engages with the sheath, so that the slider moves to the sheath. It is difficult for the slider to come off the sheath, and the slider moves smoothly along the sheath, thereby ensuring that the first and second sliders alternately protrude smoothly and stably.

【Example】

Hereinafter, one embodiment of the present invention will be described based on the drawings. In FIGS. 1 and 2, 1 is a front outer cylinder of a composite writing instrument, and a sheath 2 is attached to the rear end of this front outer cylinder 1.
The rear outer cylinder 3 is connected to the rear outer cylinder 3 so as to be rotatable in forward and reverse directions and to be removable. Incidentally, this rear outer cylinder 3 can also be slid in the axial direction so that it can be operated by a knob. The sheath 2 is removably connected to the rear end of the front outer cylinder 1, and the sheath 2 serves as the connection means.
The external threaded cylinder part 20 at the tip is screwed to the internal threaded part 10 at the rear end of the front outer cylinder 1, and the rear end of the external threaded cylinder part 20 is coaxially connected integrally with the large diameter stepped front part. The front end of the circular stepped portion 21 is in contact with the rear end of the front outer cylinder 1. In this embodiment, the tip of the sheath 2 and the rear end of the front outer cylinder 1 are screwed together and fixed, but they may be press-fitted or the like. Further, here, the front circular stepped portion 21 is formed to have an outer diameter smaller than the outer diameter of the front outer cylinder 1. That is, as shown in FIGS. 3 and 4, the sheath 2, in addition to the externally threaded cylinder part 20 and the front circular step part 21, is integrally connected coaxially with the rear end of the front circular step part 21. It has a sheath shaft portion 22. The sheath shaft portion 22 is formed into a rectangular flat plate having a thickness S shown in the fourth figure that is thinner than a width H shown in the third figure. Therefore, the sheath shaft portion 22 is connected to the front circular stepped portion 2.
The axial length and radial dimension of the rear outer cylinder 3 can be shortened compared to the case where the rear outer cylinder 3 is composed of a separate cylindrical shaft, and the entire writing instrument can be made compact. Further, at the rear end of the sheath shaft portion 22, there is a large-diameter step-shaped rear circular step portion 23, and this rear circular step portion 2
Engagement shaft portions 24 each having a small-diameter stepped cylindrical shape are coaxially and integrally connected to the rear ends of the two. This engagement shaft portion 24 is formed into a two-part cylindrical shape,
It has a locking claw 24a at the rear end. As shown in FIGS. 1 and 4, the front circular stepped portion 21 has a sheath shaft that extends into the externally threaded cylinder portion 20 at an axially symmetrical position sandwiching the wall thickness of the flat sheath shaft portion 22. Two sliding holes 25 and 26 are provided that open along the upper and lower surfaces of the portion 22 and are used to insert the refill. As shown in FIGS. 1, 3, and 5 to 7, there is a knob stopper on the rear end side outer peripheral surface of the front circular stepped portion 21 of the sheath 2 to restrict the forward movement of the rear outer cylinder 3. A locking protrusion 27 for regulating the function and rotation of the rear outer cylinder 3 is integrally provided. As a means for regulating the forward movement and rotation of the rear outer cylinder 3, as shown in FIGS. A groove 30 is formed. The circumferential sliding groove 30 engages the locking protrusion 27.
It is formed in a substantially semicircular arc shape so that it can be rotated forward and backward by 180 degrees, and in this embodiment, its circumferential sliding groove 30
An axial sliding groove 30a is connected to one end in the axial direction. This axial sliding groove 30a is a groove for enabling a sharpener shaft 4, which will be described later, to be clicked.
As shown in FIGS. 1 and 6, the distance between the rear end of this axial sliding groove 30a and the rear end of the locking projection 27 is equal to or less than the notch width b at the rear end of the sheath 2. A distance of the above length notch allowance a is provided. Therefore, this axial sliding groove 30a is connected to the rear outer cylinder 3.
The forward movement of the rear outer cylinder 3 is restricted by contacting the rear end of the locking protrusion 27 at the 0-notch forward position. In this embodiment, the axial sliding groove 30a is provided only at one end of the circumferential sliding groove 30. This is because the ballpoint pen shaft 5, which will be described later, does not need to be clicked, so only the sharpener shaft 4 can be clicked. However, if both the first and second refills are made of a pencil shaft, both need to be able to be clicked, so as shown in FIG. 30a, 30b
may be formed by connecting them. In the sliding holes 25 and 26 of the sheath 2, as shown in the first diagram, a sharp pencil shaft (first refill) 4 and a ballpoint pen shaft (second refill) 5 are slidable in the axial direction. It has been inserted. The sharpening pen shaft 4 is connected to one of the sliding holes 2
Since the lead guide 41 is removably connected to the tip of the core pipe 40 inserted into the tube 5, the rear outer tube 3 was pulled out from the front outer tube 1 and the sheath 2 was removed from the front outer tube 1. Thereafter, by removing the core pipe 40 from the lead guide 41, the core pipe 40 can be refilled with a lead. In such a sharpening pen shaft 4, a lead feeding mechanism 42 is arranged on the distal end side of the lead guide 41. The lead feeding mechanism 42 includes a lead chuck, a chuck tightening ring, and a first elastic body 43 (not shown). On the other hand, the ballpoint pen shaft 5 is connected to the other sliding hole 2.
The pen mounting shaft 50 is detachably connected to the front end of a pen mounting shaft 50 that is slidably inserted into the pen mounting shaft 6 . The ballpoint pen shaft 5 may be connected to the front end of a pen mounting shaft 50 via a pen holder 51, as shown in FIG.
In this case, the pen holder 51 includes a small-diameter shaft portion 50a at the tip of the pen mounting shaft 50 and a connecting cylinder portion 51A having a minimum diameter, which is connected by press-fitting, adhesive, etc. pipe 40
A large-diameter stepped small-diameter fitting cylinder portion 51 that can be fitted and connected.
B, and a larger diameter fitting cylinder part 51C which communicates with this tip and has a larger diameter stepped shape and which is removably connected to the rear end side of the ballpoint pen shaft 5. With the pen holder 51, the ballpoint pen shaft 5 fitted and connected to the large-diameter fitting tube portion 51C is pulled out, and another sharpening pen shaft having a different core diameter or type from the sharpie pen shaft 4 is inserted into the small-diameter fitting tube portion. By fitting and connecting to 51B, compatibility of refills is obtained. Sliders 6 and 7 are integrally connected to the rear ends of the sharpener shaft 4 and the ballpoint pen shaft 5, respectively. As shown in FIG. 9, the sliders 6 and 7 are made of symmetrical semicircular members, and axial sliding grooves 60 and 70 are provided on the flat surfaces on the center side of each arc. These axial sliding grooves 60 and 70 are formed to have a groove width corresponding to the width H of the sheath shaft 22, and are fitted into the sheath shaft 22 from above and below, so that the sheath shaft 22 can be held in place. They are designed to be able to slide individually in the axial direction. Therefore, both side wall portions of the axial sliding grooves 60 and 70 have hook leg portions 60a that are slidable in the axial direction on both side surfaces of the sheath shaft portion 22 and that engage in the axial direction. 60a and 70a, 70a are formed. Here, the sliders 6 and 7 have the bottom surfaces of the axial sliding grooves 60 and 70 in surface contact with the upper and lower flat surfaces of the sheath shaft portion 22, and the hook legs 60a are resistant to loads in the axial direction. , 60a and 70a, 70a
engages with the side surface of the sheath shaft 22, so the sliders 6, 7 can slide stably and smoothly without coming off the sheath shaft 22. In addition, in the center part of the outer peripheral surface of each of the sliders 6 and 7, the sliders shown in FIGS.
As shown in FIG. 0, cam engaging protrusions 61 and 71 are integrally provided to press and engage the rear end with a cam surface of a cam cylinder 8, which will be described later, and push the sliders 6 and 7 forward. The rear end portion of each cam engaging protrusion 61, 71 is formed into a sharp tapered shape as shown in FIGS. 2 and 10, or a circular shape (not shown). The sharpening pen shaft 4 and the ballpoint pen shaft 5 are connected to an elastic body 44 interposed between the rear end of the front circular stepped portion 21 of the sheath 2 and the front ends of the sliders 6 and 7.
and 52 are always biased in the backward direction. As a result, the rear ends of the cam engaging protrusions 61 and 71 of each slider 6 and 7 are pressed into engagement with the cam surface of the cam cylinder 8. In this way, the sharp pen shaft 4 and the ballpoint pen shaft 5
The sheath shaft portion 22 of the sheath 2 is attached in a unit state.
A cam cylinder 8 for alternately protruding the sharpening pen shaft 4 and the ballpoint pen shaft 5 is fitted and engaged on the rear end side so as to be rotatable in the forward and reverse directions. That is, by inserting and passing the locking pawl 24a of the engagement shaft portion 24 at the rear end of the sheath shaft portion 22 from the front end side into the small diameter shaft insertion hole 80 provided at the rear end side shaft center of the cam cylinder 8, This locking claw 24a is connected to the shaft insertion hole 80.
The cam cylinder 8 engages with the rear end wall surface and the engagement shaft portion 2
It can be rotated around 4. Here, as shown in the first diagram, the shaft insertion hole 80
When the rear end wall surface is engaged with the locking pawl 24a, the rear end surface of the sheath shaft portion 22 and the shaft insertion hole 8
A distance b is provided between the front end wall surface of 0 and the front end wall surface. This distance b serves as an allowance for the lead feeding notch of the pencil shaft 4, and is set to a length that is equal to or less than the above-mentioned distance a. Therefore, the cam cylinder 8 can move forward in the axial direction by the distance b and can be clicked. Further, the cam cylinder 8 is engaged with the rear outer cylinder 3 in the axial direction. As the engagement means, an axial engagement groove 81 (see FIG. 1 and FIGS. 11 to 13) provided on the outer peripheral surface of the rear end side of the cam cylinder 8 is provided on the rear end side of the rear outer cylinder 3. Anti-rotation protrusion 31 integrally protruding from the inner peripheral surface
(See FIGS. 1 and 13) are fitted and engaged. This allows the cam cylinder 8 to rotate integrally with the rear outer cylinder 3. An externally threaded cylindrical portion 90 of the crown screw 9 is screwed into an internally threaded portion 82 provided on the rear end side of the cam cylinder 8 . At the time of screwing, the plunge shaft portion 93 integrally protruding from the shaft center of the crown screw 9 engages with the engagement shaft portion 2.
4, the shaft insertion hole 80
This makes the press-fitting engagement of the locking pawl 24a more reliable and firm. Further, the above-mentioned crown screw 9 fastens the base of the clip 100 to the rear end of the rear outer cylinder 3. The cam cylinder 8 is shown in FIGS. 1, 2 and 11.
As shown in FIG. 12, the curved inclined cam surfaces 83 and 84 on the front end surface side, and
Tip locking part 85 provided at the tip of 3,84
and a rear end locking portion 86 of the curved inclined cam surfaces 83, 84. When the sliders 6 and 7 are retracted into the front outer cylinder 1, one curved inclined cam surface 83
The cam engaging projection 61 of the slider 6 of the sharpening pen shaft 4 is located on the other side, and the cam engaging projection 71 of the slider 7 of the ballpoint pen shaft 5 is located on the other curved inclined cam surface 84.
are pressed and engaged by the urging force of the elastic bodies 44 and 52, respectively. Therefore, as shown in FIGS. 2 and 14, the rotation of the cam cylinder 8 causes the curved inclined cam surfaces 83, 84
When the cam engaging protrusions 61 and 71 are held at the intermediate portion of the front outer cylinder 1, the sharp pen shaft 4 and the ballpoint pen shaft 5 are housed and held in the retracted position of the front outer cylinder 1. In addition, the cam engagement protrusion 61 of the sharpening pen shaft 4 is connected to the tip locking portion 85.
When engaged, the sharpener shaft 4 protrudes, and at the same time, the cam engaging protrusion 71 of the ballpoint pen shaft 5 engages with the rear end locking portion 86, and the ballpoint pen shaft 5 is held in the retracted storage position. Conversely, when the cam engaging projection 61 on the sharpening pen shaft 4 side engages with the rear end locking portion 86 and the cam engaging projection 71 on the ballpoint pen shaft 5 side engages with the tip locking portion 85, the sharpening pen shaft 4 is retracted. In addition, the ballpoint pen shaft 5 is held in the protruding position. In this manner, the sharpening pen shaft 4 and the ballpoint pen shaft 5 are alternately moved forward and backward by the rotation of the cam cylinder 8, and are housed at the same time. Next, the operation of the above embodiment will be explained. Rear outer cylinder 3
When the cam barrel 8 rotates in one direction, the cam barrel 8 rotates in one direction, and the cam engaging protrusion 61 of the slider 6 of the sharpening pen shaft 4 engages one curved cam surface 83 as shown in FIG. It moves forward toward the tip locking portion 85 side. At this time, the rotational load of the cam barrel 8 acts on the slider 6, but this load is caused by the hooking legs 60a, 60a of the slider 6 engaging both sides of the sheath shaft 22, as shown in FIG. As a result, the slider 6 smoothly slides forward along the sheath shaft portion 22. As a result, the pencil shaft 4 moves forward. At the same time, the slider 7 of the ballpoint pen shaft 5
The cam engaging protrusion 71 of the other curved inclined cam surface 84
By moving toward the rear end locking part 86,
The ballpoint pen shaft 5 moves backward. This backward movement is performed by the urging force of the elastic body 52. Then, the cam engagement protrusion 6 on the sharpening pen shaft 4 side
1 engages with the tip locking portion 85 and the cam engaging protrusion 71 on the ballpoint pen shaft 5 side engages with the rear end locking portion 86, whereby the pencil shaft 4
is held in a position protruding from the tip of the front outer cylinder 1, and at the same time, the ballpoint pen shaft 5 is housed and held in a retracted position within the front outer cylinder 1. In this state, when the rear outer cylinder 3 is clicked, the cam cylinder 8 moves forward together with the rear outer cylinder 3, and the slider 6 of the sharpening pen shaft 4 moves forward with the cam cylinder 8, so that the lead pipe 40 is pushed forward and the core feeding mechanism 42 operates to perform core feeding. When the rear outer cylinder 3 is rotated in the other direction from this state, the cam cylinder 8 integrated therewith is rotated in the other direction, and the pencil shaft 4 moves along one curved inclined cam surface 83 of the cam cylinder 8. At the same time that the cam engaging protrusion 61 on the side moves backward, the cam engaging protrusion 71 on the ballpoint pen shaft 5 side is moved forward by the other curved inclined cam surface 84 of the cam barrel 8. As a result, the ballpoint pen shaft 5 moves forward and protrudes, and at that position the cam engagement protrusion 71 engages the tip locking portion 8.
At the same time, the sharpener shaft 4 is retracted and stored. FIG. 15 shows another embodiment of the sliders 6, 7. In this embodiment, one hooking leg 60 of each of the sliders 6 and 7 shown in FIG.
By removing the sliders 6, 70a, each of the sliders 6, 7 is provided with a hooking leg 60a, 70a that projects in the relative direction. In this case, the hook legs 60a, 70a rotate the cam barrel 8 in the forward direction of the pencil shaft 4 (first
Due to the rotational load of the cam cylinder 8 during the rotation in the direction of arrow A in FIG. When the cam barrel 8 is rotated in the forward direction of 5 (rotation in the direction of arrow B), the hooking leg 70a of the slider 7 on the ballpoint pen shaft 5 side is moved against the sheath shaft 22 by the rotation load of the cam barrel 8. It is provided on each side of each of the sliders 6 and 7 so as to engage with the other side. As a result, the hook legs 60a and 70a alternately engage the side surfaces of the sheath shaft 22 due to the rotational load of the cam barrel 8 when the sharpening pen shaft 4 and the ballpoint pen shaft 5 move forward, so that the cam barrel 8 rotates. The sliders 6, 7 do not come off the sheath shaft 22 due to dynamic loads, and the sliders 6, 7 stably and smoothly slide forward on the sheath shaft 22 as in the previous embodiment. 16 to 18 and 19 to 21 show a second embodiment of the cam cylinder movement regulating mechanism. In this second embodiment, the sheath 2 and the cam barrel 8 are each improved. First, the structure of the sheath 2 will be explained with reference to FIGS. 16 to 18. The rear circular step part 23 of the sheath 2 is the width H of the sheath shaft part 22.
A stopper protrusion 28 for regulating rotation and axial movement of the cam cylinder 8 is integrally provided on the outer periphery of the rear circular stepped portion 23 . On the other hand, in FIGS. 19 to 22, the cam cylinder 8
Explain the structure of A circumferential sliding groove 87 is provided in the middle of the outer peripheral surface of the cam cylinder 8 to engage with the stopper projection 28 and to restrict movement of the cam cylinder 8. This circumferential sliding groove 87 is formed in a semicircular arc shape across the opposite circumferential surface of the cam cylinder 8 on the maximum axis length side, and
One end of the circumferential sliding groove 87 is connected to the front end of an axial sliding groove 88 extending rearward for securing a notch. The distance c between the rear end of the axial sliding groove 88 and the rear end of the stopper projection 28 is formed to a length equivalent to or greater than the distances a and b shown in the first diagram, as shown in FIG. 22. has been done. Furthermore, a guide groove 89 extending axially forward is provided in the middle of the axial sliding groove 88 to facilitate assembly of the cam cylinder 8 to the sheath 2. This guide groove 89 has a shaft insertion hole 8 of the cam cylinder 8.
When the sheath 2 is inserted into the sheath 2, the stopper protrusion 28 of the sheath 2 is fitted from the inside. That is, by inserting and passing the locking claw 24a of the sheath 2 through the shaft insertion hole 80 with the stopper protrusion 28 fitted into the guide groove 89 from the inside, the cam cylinder 8 is inserted into the engagement shaft portion 24 of the sheath 2. Rotatably engaged and locked. At the same time, the stopper protrusion 28 comes into contact with the rear end wall of the circumferential sliding groove 87, and slides in the circumferential sliding groove 87 due to the rotation of the cam cylinder 8, thereby causing the cam cylinder 8 to slide. It can be rotated only 180 degrees. Therefore, the detent projection 31 of the rear outer cylinder 3 and the axial engagement groove 81 of the cam cylinder 8 shown in FIG. 1 become unnecessary and can be removed. Further, when the stopper projection 28 is engaged with one end of the circumferential sliding groove 87 on the axial sliding groove 88 side, the stopper projection 28 can slide in the sliding groove 88 in the axial direction. This allows the cam cylinder 8 to move forward when the pencil shaft 4 is clicked for feeding out the lead. Therefore, in this embodiment, as the cam cylinder 8 rotates in one direction together with the rear outer cylinder 3, the stopper protrusion 28 of the sheath 2 engages with one end of the circumferential sliding groove 87 of the cam cylinder 8. When the cam cylinder 8 is aligned, the unidirectional rotation of the cam cylinder 8 is restricted, and the sharp pen shaft 4 protrudes from the tip of the front outer cylinder 1, and at the same time, the ballpoint pen shaft 5 is stored in the retracted position within the front outer cylinder 1. . In this state, when the rear outer cylinder 3 is clicked, the cam cylinder 8 moves forward together with the rear outer cylinder 3. In this case, the stopper projection 28 moves backward within the axial sliding groove 88 of the cam barrel 8, thereby allowing the cam barrel 8 to move forward. When the lead pipe 40 of the sharpening pen shaft 4 is pushed forward by the cam cylinder 8, the lead feeding mechanism 42 is operated and the lead is fed. When the lock on the rear outer cylinder 3 is released, the cam cylinder 8 moves backward by the elastic force of the elastic bodies 44 and 52, and the stopper protrusion 28 moves into the axial sliding groove 8.
8 and is held in a slidable state within the circumferential sliding groove 87. When the rear outer cylinder 3 is rotated in the other direction from this state, the cam cylinder 8 is rotated in the other direction together with the rear outer cylinder 3, and the stopper projection 28 slides in the circumferential sliding groove 87 in the other direction. At the same time, the cam engaging protrusion 61 of the slider 6 of the sharpening pen shaft 4 moves one curved inclined cam surface 83 from the tip locking part 85 to the rear end locking part 8.
6, and in the opposite direction, the cam engaging protrusion 71 of the slider 7 of the ballpoint pen shaft 5 moves on the other curved inclined cam surface 84. As a result, the ballpoint pen shaft 5 protrudes, and
At the same time as the sharpening pen shaft 4 is retracted and stored, the stopper protrusion 28 engages with the other end of the circumferential sliding groove 87 at that position, thereby restricting rotation of the cam barrel 8 in the other direction. FIG. 23 shows a third embodiment of the cam cylinder movement regulating mechanism. In this embodiment, a first sharpening pen shaft 4 and a second sharpening pen shaft 5 having different lead diameters are used.
The cam cylinders 8 are configured to project alternately. That is, in order to obtain a notch allowance for leading the lead at the respective protruding positions of the first and second sharpening pen shafts 4 and 5, axial sliding grooves 8 are provided at both ends of the circumferential sliding groove 87.
8,88a are connected. Therefore, when the cam cylinder 8 is rotated in one direction together with the rear outer cylinder 3, the cam engaging protrusion 61 of the slider 6 of the first pencil shaft 4 locks the tip of one curved inclined cam surface 83. At the same time, the cam engaging protrusion 71 of the other sharpening pen shaft 5 system moves the other curved inclined cam surface 84 toward the rear end locking portion 86, whereby the first sharpening pen shaft 4 and move forward with the second sharpening pen shaft 5.
moves backwards. Then, the stopper protrusion 28 engages with one end of the circumferential sliding groove 87, thereby causing the cam cylinder 8
One-way rotation is restricted, and at the same time that the first sharpening pen shaft 4 protrudes from the tip of the front outer cylinder 1, the second sharpening pen shaft 5 is stored in the retracted position within the front outer cylinder 1. In this state, when the cam cylinder 8 is moved forward by a knock operation on the rear outer cylinder 3, the lead of the first sharpening pen shaft 4 is moved. Next. When the cam barrel 8 is rotated in the other direction, the first sharpening pen shaft 4 moves backward, the second sharpening pen shaft 5 protrudes forward, and the cam barrel 8 moves forward by the subsequent knocking operation. As a result, the lead of the second sharpening pen shaft 5 is fed. In this way, the first and second pencil shafts 4 and 5 are mutually projected and retracted by the forward and reverse rotation of the cam cylinder 8 by the rear outer cylinder 3. When the cam cylinder 8 rotates in one direction, one of the first and second sharpening pen shafts 4 protrudes and the other retracts, and the stopper protrusion 28 engages with one end of the circumferential sliding groove 87. This restricts the unidirectional rotation of the cam cylinder 8. Further, due to the rotation of the cam barrel 8 in the other direction, the rotation of the cam barrel 8 in the other direction is restricted at a position where one of the sharp pencil shafts 4 and 5 is retracted and the other protrudes. Furthermore, when the cam barrel 8 is rotated approximately 90 degrees, the cam engaging protrusions 61 and 71 of the sliders 6 and 7 of the first and second sharpening pen shafts 4 and 5 engage the curved inclined cam surfaces on both sides of the cam barrel 8. 83 and 84, respectively. As a result, the first and second sharpener shafts 4 and 5 are each held in the storage position within the front outer cylinder 1. 24 to 29 show a fourth embodiment of the cam cylinder movement regulating mechanism. In this embodiment, the cam cylinder 8
This is achieved by engagement between a rotation preventing projection 80a protruding from the inner circumferential surface of the cam cylinder 8 and a locking groove 24a formed in the sheath 2 as a rotation restriction means. That is, on the inner circumferential surface of the cam cylinder 8 and in the shaft insertion/removal hole 8.
A detent protrusion 80a is provided protruding from the front end side of 0. Note that 8a is a locking protrusion that engages with the locking groove 3a of the rear outer cylinder 3 and rotates the cam cylinder 8 and the rear outer cylinder 3 integrally, as will be described later. On the other hand, on the outer peripheral surface of the rear circular stepped portion 23 of the sheath 2,
As shown in FIGS. 25 to 27, a cutout engagement groove 23a is formed which engages with the rotation prevention protrusion 80a and limits its rotation range. The notch engagement groove 23a is connected to the rotation prevention protrusion 8.
It is formed into a substantially semicircular arc that can rotate 0a forward and backward by 180 degrees. The cam cylinder 8 is engaged with the inner circumferential surface of the rear outer cylinder 3 in the axial direction, and rotates forward and backward integrally with the rear outer cylinder 3. As the engagement means, as mentioned above, the cam cylinder 8
A locking protrusion 8a provided on the outer peripheral surface of the rear end side is fitted into and engaged with a locking groove 3a provided on the inner peripheral surface of the rear outer cylinder 3. In contrast to this embodiment, a locking groove may be provided on the outer peripheral surface of the rear end of the cam cylinder 8, and a locking protrusion may be provided on the inner peripheral surface of the rear outer cylinder 3. FIGS. 30 and 31 show a fourth embodiment of the cam cylinder movement regulating mechanism. In this embodiment, unlike the third embodiment, a rotation preventing protrusion 80a protruding from the inner circumferential surface of the cam barrel 8 is used as a rotation regulating means for the cam barrel 8. ，
This is done through engagement with 71. Therefore, unlike the third embodiment, the engagement groove 23a of the rear circular stepped portion 23 of the sheath 2 is not required. That is, in this embodiment, as shown in FIG. 30,
When the refils 4 and 5 retreat, the slider 6,
A detent projection 80a is formed at the rear end locking portion for locking the cam engaging projections 61, 71 of No.7. Therefore, in this fourth embodiment, the detent projection 80a engages with the cam engagement projection 61 or 71,
It is possible to restrict forward and reverse rotation of the cam cylinder 8 and prevent the cam cylinder 8 from rotating too much. In this embodiment as well, a notch allowance b is ensured between the cam engaging protrusion 61 or 71 and the rear end locking part 86, and the first and second refills 4, 5
Either one of (in this case, Fig. 30, Fig. 3)
The symbol 86 of 1 is formed as shown by a dotted line. ) or both (in this case, the reference numeral 86 in the same figure as above is indicated by a solid line). 32 to 34 show other embodiments of the connection structure between the front outer cylinder 1 and the sheath 2. In this example,
A small-diameter step-shaped cylindrical portion 22A is provided on the front end side of the front circular stepped portion 21 of the sheath 2. A plurality of locking protrusions 22B are integrally provided on the holder. Further, on the rear end side of the front outer cylinder 1, as shown in FIG.
A circumferential locking hole 12 is provided that communicates with the front end and introduces the locking protrusion 22B from the outer cylinder axial guide hole 11. On the entrance side of the circumferential locking hole 12, a locking step 13 and an inclined elastic locking piece 14 on the opposite side are provided. Therefore, when the locking protrusion 22B is pushed into the axial guide hole 11 from the rear end and the sheath 2 is rotated in one direction, the locking protrusion 22B is pushed into the circumferential locking hole 12. and the elastic locking piece 14
is press-fitted and locked inside the locking step portion 13 by a resilient force. Thereby, the sheath 2 can be detachably connected to the front outer cylinder 1 with a single touch. The rest of the structure of this embodiment is the same as that of the first embodiment, and therefore the same effects as the first embodiment can be obtained.

【Effect of the invention】

As described above, according to the present invention, the first and second
A sheath is formed in the shape of a flat plate, and the refil is attached and set so as to be slidable in the axial direction and removably connected to the front outer cylinder. The first to slide the sheath into contact
The second slider is provided with a hook leg that engages with the side surface of the sheath under the rotational load of the cam cylinder in the direction of protruding the refil. Since the slider does not come off the sheath and the slider stably and smoothly slides on the sheath, the projecting operation of the reflex reel can be carried out smoothly and reliably. Further, since the sheath is formed into a flat plate shape as described above, the outer cylinder of the writing instrument can be made small in diameter, and the writing instrument as a whole can be made compact.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a composite writing instrument according to an embodiment of the present invention, Fig. 2 is a plan view of the internal mechanism showing a cross section of the rear outer cylinder of the composite writing instrument of Fig. 1, and Fig. 3 is an enlarged view of the sheath. A plan view, FIG. 4 is a sectional view taken along the - line in FIG. 3, FIG. 5 is a sectional view taken along the - line in FIG. 8 is a partial sectional view of the pen holder, FIG. 9 is a sectional view taken along the - line in FIG. 1, FIG. 10A is a plan view of the slider, FIG.
Fig. 1 is a plan view of the cam cylinder, Fig. 12 is a sectional view taken along the - line in Fig. 11, Fig. 13 is a sectional view taken along the - line in Fig. 12, Fig. 14 is an explanatory diagram of the unfolding action of the cam cylinder, and Fig. 1
5 is the same sectional view as FIG. 9 of another embodiment of the slider, FIG. 16 is a plan view of the sheath according to the second embodiment of the cam cylinder movement regulating mechanism, and FIG. 17 is the same sectional view,
8 is a cross-sectional view taken along the - line in FIG. 16, FIG. 19 is a plan view of the cam cylinder adapted to the sheath of the second embodiment of the cam cylinder movement restriction mechanism, and FIG. 20 is a cross-sectional view taken along the - line in FIG. 19. , FIG. 21 is a sectional view taken along the - line in FIG. 20,
Fig. 22 is an explanatory diagram of the unfolding action of the cam cylinder, Fig. 23 is an exploded view of the cam cylinder according to the third embodiment of the cam cylinder movement restriction mechanism, and Fig. 24 is a diagram showing the fourth embodiment of the cam cylinder movement restriction mechanism.
FIG. 25 is a sectional view of a writing instrument showing an example of
Fig. 4 is a sectional view of the sheath, Fig. 26 is a rear end view of the sheath of Fig. 24 with the cam cylinder fitted, and Fig. 27 is a sectional view of the sheath of Fig. 2.
5 is a sectional view taken along the - line in FIG. 5, FIG. 28 is a sectional view of the cam cylinder shown in FIG. 24, FIG. 29 is a sectional view taken along the line XI-XI in FIG. 28, and FIG. FIG. 31 is a plan view of a cam cylinder showing an embodiment, FIG. 31 is an explanatory view of the unfolding action of the cam cylinder, FIG. 32 is a longitudinal cross-sectional view of a writing instrument according to another embodiment, and FIG. 33 is a front outer cylinder of FIG. 32. FIG. 34 is a cross-sectional view showing the sheath of FIG. 32. In the figure, 1 is a front outer cylinder, 2 is a sheath, 3 is a rear outer cylinder, 4 is a first refill, 5 is a second refill, 6 and 7 are sliders, 60a and 70a are hook legs, and 8 is a It is a cam cylinder.

Claims (1)

[Claims] 1 The rotation of the rear outer cylinder 3, which is rotatably and removably connected to the rear end of the front outer cylinder 1, causes the first cylinder inserted into the front outer cylinder 1 to be slidable in the axial direction. 1. A composite writing instrument in which second reflex reels 4 and 5 are alternately protruded, which is detachably connected to the rear end of the front outer cylinder 1 and slides the first and second reflex reels 4 and 5 in the axial direction. movably mounted sheath 2
and are connected to the rear ends of the first and second refils 4, 5, respectively, and are in sliding contact with the sheath 2 at an axially symmetrical position of the sheath 2 so as to be slidable in the axial direction within the rear outer cylinder 3. The inserted first and second sliders 6 and 7 are engaged in the axial direction within the rear outer cylinder 3, and as the rear outer cylinder 3 rotates, the first and second sliders 6 and 7 The slider sliding portion of the sheath 2 is formed into a flat plate shape, and the rear outer cylinder is provided with a cam cylinder 8 through which the first and second refills 4, 5 are alternately projected. 3. A composite writing instrument characterized in that the first and second sliders 6, 7 are provided with hook legs 60a, 70a that engage with at least one side of the sheath 2 which is subjected to a rotational load of 3.