JPS62297199A - Composite writing utensil - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Industrial Application Field] This invention provides a mechanical pencil, for example, two types of mechanical pencils with different lead diameters, t* is a combination of a mechanical pencil and a ballpoint pen, etc. The present invention relates to a composite writing instrument equipped with a second reflex reel, and particularly relates to an improvement of a composite writing instrument equipped with a cam tube that alternately protrudes and retracts the first and second reflex reels.

[Conventional technology]

Conventional composite writing instruments of this type are rotatably connected to the rear end 1 of the front outer periphery, and by rotating the rear outer cylinder, a mechanical pencil is created with a tension cylinder that rotates together with the rear outer cylinder. The barrel and ballpoint pen barrel are designed to alternately protrude and retract from the tip of the front outer cylinder.

The mechanical pencil shaft, ballpoint pen shaft, and cam barrel are mounted on a sheath that is integrally connected within the rear outer cylinder mainly by adhesive.

[Problem that the invention seeks to solve]

In such conventional composite writing instruments, the cam barrel can rotate more than 360 degrees, so when the rear outer barrel is rotated, the cam barrel rotates too much, causing the mechanical pencil shaft and ballpoint pen shaft to protrude or retract. There was a problem that the operation could not be performed smoothly and reliably.

In addition, since the sheath is fitted and glued into the rear outer cylinder, it takes a lot of effort to assemble it, and the inside of the rear outer cylinder gets dirty with adhesive, and furthermore, the fitting adhesive is insufficient. There was also the problem that the sheath could be removed from the rear outer cylinder.

This invention was made in order to solve the above problem, and the rotation of the cam cylinder is restricted by the alternately protruding and retracting positions of the first and second refils, thereby preventing the cam cylinder from turning too much. By doing so, it is possible to obtain a composite writing instrument in which the protruding and retracting operations of the first and second refills are performed smoothly and reliably, and the sheath can be easily attached and set without soiling the inside of the rear outer periphery. purpose.

[Means for solving problems]

In the composite writing instrument according to the present invention, a sheath is removably connected to the rear end of the front outer cylinder, first and second refills are attached and set to the sheath so as to be slidable in the axial direction, and a cam The cylinders are rotatably fitted, and the unidirectional rotation of the cam cylinder is restricted at a position where one of the first and second refils protrudes and the other recedes. And, by rotating this cam cylinder in the other direction, the first and second
A cam rotation regulating means is provided for regulating rotation of the cam cylinder in the other direction at a position where one of the refils is retracted and the other protrudes.

[Effect]

In the composite writing instrument of the present invention, by rotating the rear outer cylinder in one direction, the cam cylinder rotates in one direction integrally with the rear outer cylinder, so that one of the first and second refills protrudes and the other reel protrudes. At the retracted position, the rotation of the cam cylinder in one direction is restricted by the cam rotation restriction means, and the rotation of the rear outer cylinder in the other direction causes one of the first and second reflexes to retract. At the position where the other one protrudes, the rotation of the cam cylinder in the other direction is restricted by the cam rotation restricting means, thereby smoothly and reliably protruding and retracting the first and second refils.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIG. 1, reference numeral 1 denotes a front outer cylinder of a composite writing instrument, and a tip 1A is removably screwed into the tip of this front outer cylinder 1.

A rear outer cylinder 3 is connected to the rear end of the front outer cylinder 1 via a sheath 2 so as to be rotatable in forward and reverse directions and to be insertable and removable. In addition,
This rear outer cylinder 3 can also be slid in the axial direction so as to perform a knocking operation.

The sheath 2 is removably connected to the rear end of the front outer cylinder 1, and as a connection means, an externally threaded cylindrical part 20 at the tip of the sheath 2 is connected to an internally threaded part at the rear end of the front outer cylinder 1. 10 and is integral with the rear end of the externally threaded cylinder part 20. The front end of a circular step part 21 is in contact with the rear end of the front external cylinder 1. here,
The circular stepped portion 21 is formed to have the same outer diameter as the outer diameter of the front outer cylinder 1.

That is, the sheath 2 has a shape K as shown in FIGS. 3 to 6.

In addition to the externally threaded cylindrical portion 20 and the circular stepped portion 21, a sheath shaft portion 22 is coaxially connected to the rear end of the circular stepped portion 21;
The sheath shaft portion 22 has an engagement shaft portion 23 coaxially connected to the rear end of the sheath shaft portion 22 and having a small diameter stepped shape.

This engagement shaft portion 23 rotatably fits and locks a cam cylinder 6, which will be described later, and is formed into a two-part cylindrical shape and has a locking pawl 23a at the rear end.

As shown in FIGS. 1, 4, and 6, the circular stepped portion 21 has two holes that communicate with the inside of the externally threaded cylindrical portion 20 at positions symmetrical about its axis.
Two sliding holes 24 and 25 are provided.

In addition, the outer circumferential surface of the sheath shaft portion 22 in the axial direction is as shown in FIG.

As shown in FIG. 5, guide grooves 26 and 27 are provided whose front ends extend to the outer circumferential surface of the circular stepped portion 21 and communicate with the rear ends of the slide holes 24 and 25.

These guide grooves 26 and 27 are set to have lengths corresponding to the delivery strokes of the Schaffen fi (first reflex reel) 4 and the ballpoint pen shaft (second reflex reel) 5, which will be described later. The step portion 21 and the sheath shaft portion 22 are integrally formed, and the guide groove 2 is formed across their outer peripheral surfaces.
6.27, the shape of the sheath 2 is smaller than that in the case where the circular step part 21 and the sheath shaft part 22 are separate bodies and the guide grooves 26 and 27 are formed only on the outer peripheral surface of the sheath shaft part 22. The length can be shortened. This curving allows you to shorten the overall length of the writing instrument.

As shown in Figures 3 and 5, a rotation prevention projection 2B is integrally provided on the outer peripheral surface of the rear end of the sheath shaft portion 22, and this rotation prevention projection 2B prevents the rotation of the cam cylinder 6, which will be described later. to regulate.

A mechanical pencil shaft 4 and a ballpoint pen shaft 5 are attached and set to the sheath 2 so as to be slidable in the axial direction through the sliding holes 24 and 25 and the guide grooves 26 and 27, respectively. The pen shaft 4 and the ballpoint pen shaft 5 are unitized with the sheath 2. Incidentally, the mechanical pencil shaft 4 and the ballpoint pen shaft 5 may be replaced with the first mechanical pencil shaft 4 and the second mechanical pencil shaft 5 having different core diameters to form a unit with the sheath 2 as described above.

Therefore, by removing the front outer cylinder 1 from the rear outer cylinder 3, it is possible to replenish the lead of the mechanical pencil shaft 4 and replace the ballpoint pen shaft 5.

That is, since the lead guide 4) of the mechanical pencil shaft 4 is removably connected to the tip of the lead pipe 40, after the sheath 2 is removed, the lead guide 4) can be removed from the lead pipe 40.
By removing the core, the core pipe 40 can be refilled with core.

In this mechanical pencil shaft 4, a lead feeding mechanism 42 is arranged on the tip side of the lead guide 4). The lead delivery mechanism 42 includes a lead chuck 43, a chuck tightening ring 44, and a first elastic body 45.

The rear end side of the core pipe 40 loosely passes through one sliding hole 24 of the sheath 2 and communicates with a guide groove 2.
6 so as to be slidable in the axial direction.

In order to keep this in mind, an engaging element 46 is connected to the rear end of the core pipe 40, and this engaging element 46 is slidably fitted into the guide groove 26.

Between this engager 46 and the sleeve end wall of the sliding hole 24,
A second elastic body 4 that urges the mechanical pencil shaft 4 in the backward direction
7 is provided.

The engagement element 46 has a rear end connected to the rear end wall portion 2 of the sheath shaft portion 22.
By contacting the front end of 2a, the backward movement is restricted.

On the other hand, the ballpoint pen shaft 5 is removably connected to the front end of a pen mounting shaft 50 that is slidably inserted into the other sliding hole 25 in the axial direction.

At the rear end of the pen mounting shaft 50, an engaging element 51 is slidably fitted into a guide groove 27 communicating with the sliding hole 25.
is connected to.

The rear end of this engager 51 also comes into contact with the front end of the rear end wall portion 22a of the sheath 2, so that its backward movement is restricted.

Between the engaging element 51 and the rear end wall of the sliding hole 25,
An elastic body 52 is provided that integrally urges the ballpoint pen shaft 5 and the pen mounting shaft 50 in the backward direction.

On the outer peripheral surface of the rear end of the sheath 2 where the mechanical pencil shaft 4 and the ballpoint pen shaft 5 are attached as a unit, there is a cam for alternately protruding and retracting the mechanical pencil shaft 4 and the ballpoint pen shaft 5. The cylinder 6 is fitted and engaged so as to be rotatable in forward and reverse directions.

A small diameter shaft insertion hole 60 is provided on the inner circumferential surface of the cam cylinder 6, as shown in FIGS. By inserting and passing the locking claw 23m of the mating shaft portion 23, this locking claw 23a
is engaged with the rear end wall surface of the shaft insertion hole 60, and the cam cylinder 6 is rotatably fitted and supported in the shaft insertion hole 60.

Here, as shown in the first figure, when the locking pawl 23a engages with the shaft insertion hole 60 and the shaft insertion hole 60
A distance (a) is provided between the front end surface of the sheath shaft portion 22 and the rear end surface of the sheath shaft portion 22, and this distance (a) serves as a knock for feeding out the lead of the mechanical pencil shaft 4.

Therefore, the cam cylinder 6 can move forward in the axial direction by the distance (a), thereby enabling knocking.

Such a cam cylinder 6 is connected to a mechanical pencil shaft 4 and a ballpoint pen shaft 5.
Rotation is restricted between a position where one of the two protrudes from the tip of the front outer cylinder 1 and the other is retracted, and a normal position where one of the two is retracted and the other protrudes.

As this rotation regulating means, in the middle part of the cam cylinder 6,
A circumferential sliding groove 66 is provided for restricting the rotation of the cam cylinder 6 with the rotation prevention projection 28 of the sheath 20.

This circumferential sliding groove 66 is formed in a semicircular arc shape over the maximum axis length side of the cam cylinder 6.

One end of the circumferential sliding groove 66 is connected to the front end of an axial sliding groove 67 extending rearward for securing a knock.

This axial sliding groove 67 is formed to have a length of nine, which corresponds to the distance (a) above.

A guide groove 68 is provided in the middle of the axial sliding groove 67 and extends forward in the axial direction.

When inserting the locking claw 23a of the sheath 2 into the shaft insertion hole 60, the detent projection 28 is fitted into the guide groove 68 from the inside.

That is, the locking claw 23a of the sheath 2 is inserted into and passed through the shaft insertion hole 60 while the anti-rotation protrusion 28 of the sheath 2 is inserted into the guide groove 68 from the inside.

At the same time that the cam cylinder 6 is rotatably fitted and locked to the engagement shaft portion 23 of the sheath 2, the detent projection 28 is inserted into the circumferential sliding groove 6.
6, and slides in the circumferential sliding groove 66 by the rotation of the cam cylinder 6, so that the cam cylinder 6 is rotated by 180 degrees.
It is designed so that it can be rotated only once.

Just in case, the detent projection 28 is locked to one end of the circumferential sliding groove 66 on the axial sliding groove 67 side.
The anti-rotation protrusion 28 is movable backward within the axial sliding groove 67, allowing the cam cylinder 6 to move forward during knocking for feeding out the lead of the mechanical pencil shaft 4.

The cam cylinder 6 is connected to the rear outer cylinder 3 and rotates forward and backward together with the rear outer cylinder 3.

As the connection means, in this embodiment, a crown screw 7 is screwed into the rear end side of the cam cylinder 6.

The rear outer cylinder 3 is attached to the rear end of the cam cylinder 6, and the clip 8
are fastened together to the rear end of the rear outer cylinder 3.

Furthermore, a locking groove is provided on one side of the outer peripheral surface of the rear end side of the cam cylinder 6 and an inner peripheral surface of the rear outer cylinder 3, and a locking protrusion is provided on the other side, and the locking protrusion is inserted into the locking groove. By fitting and engaging, the cam cylinder 6 may be engaged with the inner circumferential surface of the rear outer cylinder 3 in the axial direction and connected with the crown screw 7 as described above.

The above-mentioned top screw 7 is connected to an externally threaded cylindrical portion 70 and this externally threaded cylindrical portion 7.
0, and by screwing the externally threaded cylinder part 70 into the rear end side of the cam cylinder 6, the plunge shaft part 71 engages with the cam cylinder 6. The locking pawl 23a is inserted into the shaft portion 23 to securely and firmly press and engage the locking pawl 23a with the shaft insertion hole 60. In addition, this plunge shaft part 7
1, the opening diameter of the engagement shaft portion 23 may be made small.

As shown in FIGS. 1, 7, 9, and 10, the cam cylinder 6 has curved inclined cam surfaces 62, 63 on both sides of the front end, and
A tip locking portion 64 provided at the leading end of these curved inclined cam surfaces 62 and 63, and the curved inclined cam surfaces 62 and 63.
It has a rear end locking part 65.

The mechanical pencil shaft 4 is attached to one curved inclined cam surface 62.
The engaging element 46 of the ballpoint pen shaft 5 is attached to the other curved inclined cam surface 63, and the engaging element 51 of the ballpoint pen shaft 5 is attached to the elastic body 47, 52, respectively.
They are press-fitted together by the urging force of .

Therefore, due to the rotation of the cam cylinder 6, the curved #4 inclined cam surface 62
．． 63, the mechanical pencil shaft 4 and ballpoint pen shaft 5 are housed and held in the front outer cylinder 1, and the mechanical pencil shaft 4 engager 46 is held in the tip locking portion 64. When engaged, the mechanical pencil shaft 4 projects, and at the same time, the engaging element 51 of the ballpoint pen shaft 5 engages with the rear end locking surface 65, and the ballpoint pen shaft 5 is held in the retracted storage position. Also.

Conversely, the engager 46 is connected to the rear end locking portion 65 and the engager 5
1 engages with the tip locking surface 64, the mechanical pencil shaft 4 is held in the storage position and the ballpoint pen shaft 5 is held in the protruding position.

In this way, the rotation of the cam cylinder 6 causes the mechanical pencil shaft 4 and the ballpoint pen shaft 5 to move forward and backward alternately, and are housed at the same time.

Next, the operation of the above embodiment will be explained. When the rear outer cylinder 2 is rotated in one direction, the cam cylinder 6 is rotated in one direction together with the rear outer cylinder 2, and the engaging element 46 of the mechanical pencil shaft 4 is bent to one side as shown in FIG. When the surface 62 is moved toward the tip locking surface 64 side, the engager 51 of the ballpoint pen shaft 5 moves the other curved inclined cam surface 63 toward the rear end locking surface 65, thereby causing the mechanical pencil shaft 4 to move. It moves forward, and the ballpoint pen shaft 5 moves backward. Then, when the detent projection 28 of the sheath 2 engages with one end of the circumferential sliding groove 66 of the cam cylinder 6,
The unidirectional rotation of the cam cylinder 6 is restricted, and the mechanical pencil 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 knocked, the cam cylinder 6 moves forward together with the rear outer cylinder 3. In this case, the anti-rotation protrusion 28 is inserted into the axial sliding groove 6 of the cam cylinder 6.
7 allows the cam cylinder 6 to move forward. When the lead pipe 40 of the mechanical pencil shaft 4 is pushed forward by the cam cylinder 6, the lead feeding mechanism 42 is operated and the lead is fed. Then, when the knock of the rear outer cylinder 3 is released, the cam cylinder 6 is moved backward by the resilient force of the elastic bodies 47 and 52, so that the stop protrusion 28 is brought into contact with the front end of the axial sliding groove 67. It is engaged and held in a slidable state within the circumferential sliding groove 66.

In this state, if you rotate the rear outer cylinder 2fr in the other direction,
Together with this, the cam cylinder 6 rotates in the other direction, and the anti-rotation protrusion 28 slides in the other direction within the circumferential sliding #466, and the engager 46 of the mechanical pencil shaft 4 curves and tilts. The cam surface 62 moves from the front end locking surface 64 to the rear end locking surface 65, and the engager 51 of the ballpoint pen shaft 5 moves in the opposite direction.
moves.

As a result, the ballpoint pen shaft 5 protrudes and, at the same time, the mechanical pencil shaft 4 is retracted and stored.

At this position, the rotation stop projection 28 engages with the other end of the circumferential sliding groove 66, thereby restricting rotation of the cam cylinder 6 in the other direction.

FIG. 12 shows a second embodiment. In this embodiment, a first mechanical pencil shaft 4 and a second mechanical pencil shaft 5 having different lead diameters are alternately projected and retracted by a cam barrel 6.

Then, axial sliding grooves 67.67a are connected to both ends of the circumferential sliding groove 66 in order to obtain a knocking distance for feeding the lead at each protruding position of the first and second mechanical pencil shafts 4°5. ing.

Therefore, when the cam barrel 6 is rotated in one direction together with the rear outer barrel 3, the engager 46 of the first mechanical pencil shaft 4 moves one curved inclined cam surface 62 toward the tip locking surface 64. At the same time K, the engager 51 of the other mechanical pencil shaft 5 moves toward the other curved inclined cam surface 63f: rear end locking surface 65. As a result, the first mechanical pencil shaft 4 moves forward. Then, the second mechanical pencil shaft 5 moves backward. and,
The unidirectional rotation of the cam cylinder 6 is regulated by the engagement of the detent projection 28 with one end of the circumferential sliding groove 66,
At the same time that the first mechanical pencil shaft 4 protrudes from the tip of the front outer cylinder 1, the second mechanical pencil shaft 5 is stored in the retracted position within the front external cylinder 1.

In this state, by knocking the rear outer cylinder 3, the cam cylinder 6
By moving forward, the lead of the first mechanical pencil shaft 4 is fed.

Next, when the cam barrel 6 is rotated in the other direction, the first mechanical pencil shaft 4 retreats and the second mechanical pencil shaft 5 advances and protrudes, and a subsequent knocking operation causes the cam barrel to move backward. 6 moves forward, the lead of the second mechanical pencil shaft 5 is fed.

In this way, by the forward and reverse rotation of the cam cylinder 6.

The first and second mechanical pencil shafts 4.5 protrude alternately.
be forced to retire.

By rotating the cam cylinder 6 in one direction, the first and second
When one of the mechanical pencil shafts 4 and 5 is protruded and the other is retracted, the one-turn stop protrusion 28 engages with one end of the circumferential sliding groove 30.

One-way rotation of the cam barrel 6 is restricted, and the cam barrel 6
Rotation in the other direction restricts rotation of the cam cylinder 6 in the other direction at a position where one of the sharp pair shafts 4) 5 retracts and the other protrudes.

Further, when the cam barrel 6 is rotated approximately 90 degrees, the engagers 46.51 of the first and second mechanical pencil shafts 4.5 engage the curved inclined cam surfaces 62.63 on both sides of the cam barrel 6, respectively. [Thus, the first and second mechanical pencil shafts 4°5 are each held in the storage position within the front outer cylinder 1. An example is shown below. In this embodiment, a small-diameter step-shaped cylindrical portion 20a is provided on the front end side of the sheath 2, and this cylindrical portion 20a is formed to have an outer diameter approximately equal to the inner diameter of the front outer cylinder 1, and the outer peripheral surface of the cylindrical portion 20a is A plurality of locking protrusions 29 are protrudingly provided on the.

9. On the rear end side of the front outer cylinder 1, as shown in Fig. 16,
An axial guide hole 11 that is introduced into the locking protrusion 29 from the rear end side, and a circumference that communicates with the front end of the axial guide hole 11 to introduce and lock the locking protrusion 29 from the axial guide hole 11. A direction locking hole 12 is provided.

On the entrance side of the circumferential locking hole 12, a locking step 13 is provided.
An inclined elastic locking piece 14 is provided on the opposite side.

Therefore, when the locking protrusion 29 is pushed into the axial guide hole 11 from the rear end and the sheath 2 is rotated in one direction, the locking protrusion 29 is pushed into the circumferential locking hole 12. Further, the elastic locking piece 14 is press-fitted and locked inside the locking stepped portion 13 by the elastic force.

Thereby, the sheath 2 can be detachably connected to the front outer cylinder 1 with one touch.

Further, in this embodiment, a rotation prevention projection 28 is provided on the outer peripheral surface of the front end side of the sheath shaft portion 22, and this rotation prevention projection 28 is engaged with the inner peripheral surface of the rear outer cylinder 3 so as to be rotatable within a certain range. There is.

As the engagement means, a circumferential sliding groove 30 (see FIGS. 13 to 15) is provided on the inner peripheral surface of the front end side of the rear outer cylinder 3,
The detent projection 28 is rotatably fitted into and engaged with the circumferential sliding groove 30.

The circumferential sliding groove 30 allows the rotation prevention protrusion 28 to
It is formed in a substantially semicircular arc shape so that it can be rotated forward and backward by 0 degrees,
Axial sliding grooves 31 and 32 are connected to both ends of the circumferential sliding groove 30 in the axial direction.

Between the rear end of the front outer cylinder 1 and the rear end of the circumferential sliding groove 30, a knock allowance equivalent to the knock (a) on the rear end side of the sheath 2 is provided.

On the other hand, the cam cylinder 6 is engaged with the inner circumferential surface of the rear outer cylinder 3 in the axial direction, so that it can move forward and backward integrally with the rear outer cylinder 3.

As the engagement means, a locking protrusion 6a provided on the outer circumferential surface of the rear end of the cam cylinder 6 is fitted into a locking groove 3a provided on the inner circumferential surface of the rear outer cylinder 3. still.

A locking groove 3a is provided on the outer peripheral surface of the rear end side of the cam cylinder 6.

A locking protrusion 6af may be provided on the inner peripheral surface of the rear outer cylinder 3.

The rest of the structure of this third embodiment is the same as that of the first embodiment.

Therefore, in this embodiment, when the rear outer cylinder 3 is rotated in one direction, the cam cylinder 6 is rotated in one direction integrally with the rear outer cylinder 3, and the circumferential sliding groove on the inner peripheral surface of the rear outer cylinder 3 is rotated in one direction. 30, the detent protrusion 28 of the sheath 2 slides in one direction, and the detent protrusion 28 of the sheath 2 slides in one direction.
By engaging with one end of the circumferential sliding groove 30,
One-way rotation of the cam cylinder 6 is restricted.

When the rear outer cylinder 3 is knocked in this state, the cam cylinder 6 moves forward together with the rear outer cylinder 3, and the lead of the mechanical pencil shaft 4 is fed.

Next, when the cam barrel 6 is rotated in the other direction together with the rear outer barrel 3, the mechanical pencil shaft 4 retreats and the ballpoint pen shaft 5 advances and protrudes, and the cam barrel 6 is rotated at that position.
Rotation in other directions is restricted.

FIGS. 18 and 19 show a fourth embodiment.

In this embodiment, the cylindrical portion 20a of the sheath 2 in the third embodiment is connected to the inside of the front outer cylinder 1 on the rear end side by screwing.

20 to 26 show a fifth embodiment. In this embodiment, it serves as a rotation regulating means for the cam cylinder 6.

A detent projection 61 is integrally provided on the front end side of the shaft insertion hole 60 on the inner peripheral surface of the cam cylinder 6.

A notch engagement groove 2 is provided on the outer peripheral surface of the rear end wall portion 22a of the sheath shaft portion 22.
2b, and the detent projection 61 is rotatably fitted into and engaged with the notched engagement groove 22b.

The notch engagement groove 22b has the rotation stopper projection 61 18
It is formed in a substantially semicircular arc shape that can be rotated forward and backward by 0 degrees.

The cam cylinder 6 engages 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, a locking projection 6a is provided on the outer peripheral surface of the rear end of the cam cylinder 6, and a locking groove 3 is provided on the inner peripheral surface of the rear outer cylinder 3.
It is fitted and locked into a. Note that the start groove 3at may be provided on the outer peripheral surface of the rear end of the cam cylinder 6, and the locking protrusion 62 may be provided on the inner peripheral surface of the rear outer cylinder 3.

FIGS. 27 and 28 show a sixth embodiment.

In this embodiment, a detent protrusion 61 is provided on the rear end locking portion that locks the engagers 46 and 51 when the refil 4.5 is retracted.
is formed. Therefore, in this sixth embodiment, the one-turn stop protrusion 61 engages with the engaging member 46 or 51, restricts the forward and reverse rotation of the cam cylinder 6, and prevents the cam cylinder 6 from rotating too much.

Note that this embodiment also includes the engagement hole 46 or 51 and the rear end locking portion 6.
Secure the knocking fee (a) between 5 and 1st ゜ylIC2
It is possible to knock either one or both of the refills of 4.5.

〔Effect of the invention〕

As described above, according to the present invention, the rear outer cylinder rotates in one direction, and the cam cylinder that rotates together with the rear outer cylinder causes one of the first and second refils to protrude and the other to retract. is,
One-way rotation of the cam cylinder is restricted at that position, and
By rotating the rear outer cylinder in the other direction, the first
When one of the second refils retracts and the other protrudes, the rotation of the cam cylinder in the other direction is restricted at that position, so it is possible to prevent the cam cylinder from rotating too much, It is possible to smoothly and reliably project and retract the @1 and second refills.

In addition, since the sheath is connected to the rear end of the front outer cylinder, assembly is easy, and the sheath can be removed from the front outer cylinder without the need for the inside of the outer cylinder to get dirty with adhesive, unlike conventional methods. There is no risk that he will be withdrawn.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a composite writing implement according to an embodiment of the present invention, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, Fig. 3 is an enlarged plan view of the sheath, and Fig. 4 is a sectional view thereof. , FIG. 5 is a sectional view taken along the line V-V in FIG. 3, FIG. 6 is a front end view of the sheath 2, FIG. 7 is a plan view of the cam cylinder, and FIG. 8 is a sectional view taken along the line Figure 9 is the 7th
10 is a sectional view taken along line X--X in FIG. A developed view, FIG. 13 is a cross-sectional view of the main parts of a composite writing instrument according to the third embodiment, and FIG.
15 is a sectional view showing the main part of the rear outer cylinder in Fig. 13, Fig. 16 is a sectional view showing the main part of the front outer cylinder in Fig. 13, The figure is a cross-sectional view showing the sheath of FIG. 13, FIG. 18 is a cross-sectional view of the main part of the composite writing instrument according to the fourth embodiment, FIG. 19 is a plan view showing the sheath of FIG. 18, and FIG. 21 is a sectional view of the sheath in FIG. 20, FIG. 22 is a rear end view of the sheath in FIG. Figure 23 is B in Figure 21.
-B sectional view, FIG. 24 is a sectional view of the cam cylinder in FIG. 20,
Figure 25 is a sectional view taken along the line D-D in Figure 24, and Figure 26 is a cross-sectional view of the
Figure 5 is a rear end view of the cam cylinder, Figure 27 is a plan view showing another embodiment of the cam cylinder, and Figure 28 is a developed view of the cam cylinder in Figure 27. Tube, 2 is sheath, 3 is rear outer tube%
4 is a first refill, 5 is a second refill, 6 is a cam cylinder, 28.61 is a rotation prevention projection, and 22.30, 61 are engagement grooves.

Claims (6)

[Claims] (1) A rear outer cylinder (3) is rotatably and detachably connected to the rear end of the front outer cylinder (1), and the rotation of the rear outer cylinder (3) causes the front outer cylinder (1 ), the first refil (4) and the second refill (5) are slidably inserted in the axial direction.
), which is detachably connected to the rear end of the front outer cylinder (1), and in which the first
and a sheath (2) on which the second refils (4), (5) are attached so as to be slidable in the axial direction, and the rear outer cylinder (3) is engaged in the axial direction within the rear outer cylinder (3). 3) is provided with a cam cylinder (6) for shaft protrusion/retraction which presses and engages the rear ends of the first and second refills (4) and (5) alternately by the rotation of the above-mentioned A sliding groove (66) for restricting rotation that engages with the anti-rotation protrusion (28) protruding from the outer periphery of the sheath (2) is bored in the cam cylinder (6), and the engagement between the two is Therefore, by rotating the cam cylinder (6) in one direction, the first and second
unidirectional rotation of the cam cylinder (6) is restricted at a position where one of the refills (4) and (5) protrudes and the other retracts;
Moreover, by the rotation of the cam cylinder (6) in the other direction, the rotation of the cam cylinder (6) in the other direction is restricted at a position where one of the refils (4) and (5) retracts and the other protrudes. A composite writing instrument characterized by: (2) The above-mentioned refil (4), (
5) The composite writing instrument according to claim 1, further comprising an axial sliding groove (67) or (67a) that enables knocking of at least one of the above. (3) A rear outer cylinder (3) is rotatably and detachably connected to the rear end of the front outer cylinder (1), and the rotation of the rear outer cylinder (3) causes the front outer cylinder (1 ), the first refil (4) and the second refill (5) are slidably inserted in the axial direction.
), which is detachably connected to the rear end of the front outer cylinder (1), and in which the first
and a sheath (2) on which the second refils (4), (5) are attached so as to be slidable in the axial direction, and the rear outer cylinder (3) is engaged in the axial direction within the rear outer cylinder (3). 3) is provided with a cam cylinder (6) for shaft protrusion/retraction which presses and engages the rear ends of the first and second refills (4) and (5) alternately by the rotation of the above-mentioned A rotation regulating sliding groove (30) that engages with a rotation prevention protrusion (28) protruding from the outer peripheral surface of the sheath (2) is formed on the inner peripheral surface of the rear outer cylinder (3). Due to the engagement between the two, the cam cylinder (6) rotates in one direction, thereby causing the first
The rotation of the cam cylinder (6) in one direction is restricted at a position where one of the second refils (4) and (5) protrudes and the other retracts, and the cam cylinder (6) is restricted from rotating in the other direction. A composite writing instrument characterized in that the rotation of the cam tube (6) in the other direction is restricted at a position where one of the refills (4), (5) retracts and the other protrudes by rotation. (4) The said refil (4), (
5) The composite writing instrument according to claim 3, further comprising an axial sliding groove (31) or (32) that enables knocking of at least one of (5). (5) A rear outer cylinder (3) is rotatably and detachably connected to the rear end of the front outer cylinder (1), and the rotation of the rear outer cylinder (3) causes the front outer cylinder (1 ), the first refil (4) and the second refill (5) are slidably inserted in the axial direction.
), which is detachably connected to the rear end of the front outer cylinder (1), and in which the first
and a sheath (2) on which the second refils (4), (5) are attached so as to be slidable in the axial direction, and the rear outer cylinder (3) is engaged in the axial direction within the rear outer cylinder (3). 3) is provided with a cam cylinder (6) for shaft protrusion/retraction which presses and engages the rear ends of the first and second refills (4) and (5) alternately by the rotation of the above-mentioned An engagement groove (22) for rotation restriction that engages with a rotation prevention protrusion (61) protruding from the inner circumferential surface of the cam cylinder (6).
is formed on the outer periphery of the sheath (2), and due to the engagement between the two, rotation of the cam cylinder (6) in one direction causes the first
The rotation of the cam cylinder (6) in one direction is restricted at a position where one of the second refils (4) and (5) protrudes and the other retracts, and the cam cylinder (6) is restricted from rotating in the other direction. A composite writing instrument characterized in that the rotation of the cam tube (6) in the other direction is restricted at a position where one of the refills (4), (5) retracts and the other protrudes by rotation. (6) A rear outer cylinder (3) is rotatably and detachably connected to the rear end of the front outer cylinder (1), and the rotation of the rear outer cylinder (3) causes the front outer cylinder (1 ), the first refil (4) and the second refill (5) are slidably inserted in the axial direction.
), which is detachably connected to the rear end of the front outer cylinder (1), and in which the first
and a sheath (2) on which the second refils (4), (5) are attached so as to be slidable in the axial direction, and the rear outer cylinder (3) is engaged in the axial direction within the rear outer cylinder (3). 3) is provided with a cam cylinder (6) for shaft protrusion/retraction which presses and engages the rear ends of the first and second refills (4) and (5) alternately by the rotation of the above-mentioned When the refills (4), (5) are retracted, the rear ends of the refills (4), (5) come into contact with and are locked to the rear end locking surface (65) of the cam cylinder (6) to prevent rotation. Protrusion (61
) is provided protrudingly, and the cam cylinder (6
), the unidirectional rotation of the cam cylinder (6) is restricted at a position where one of the first and second refills (4), (5) protrudes and the other retracts; Moreover, due to the rotation of the cam cylinder (6) in the other direction, the refil (4) is rotated in the other direction.
) and (5), the rotation of the cam cylinder (6) in the other direction is restricted at the position where one of the cam cylinders (6) retracts and the other protrudes.