JPS6354298A - Composite writing utensil - Google Patents

Abstract

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

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to two types of mechanical pencils with different lead diameters, or a combination of a mechanical pencil and a ballpoint pen, which have a first and second refill. The present invention relates to a writing instrument, and particularly to an improvement of a composite writing instrument equipped with a cam tube that alternately protrudes and retracts a first and second refill.

[Conventional technology]

Conventional composite writing instruments of this type include a sheath connected to the rear end of an outer cylinder to which a mechanical pencil shaft and a ballpoint pen shaft are slidably attached in the axial direction; It consists of a combination of a movably connected cap and a cam cylinder rotatably fitted and supported on the sheath shaft of the sheath and engaged in the axial direction within the outer cylinder. By moving the mechanical pencil shaft and the ballpoint pen shaft, the mechanical pencil shaft and the ballpoint pen shaft are alternately protruded and retracted from the tip of the outer cylinder using a cam cylinder that rotates together with the outer cylinder.

[Problem that the invention seeks to solve]

In such conventional composite writing instruments, the cam barrel and sheath are separate structures, so precise alignment accuracy is required when assembling them, and the rotation of the cam barrel is required when used after assembly. During movement and axial movement, the cam cylinder tends to rattle between itself and the sheath shaft, making it impossible to operate the cam cylinder smoothly. There was a problem in that the function of the composite writing instrument deteriorated because it could no longer be retracted.

Furthermore, as mentioned above, since the cam cylinder and sheath are separate bodies, there are many parts that are bent and the structure becomes complicated.

As mentioned above, since precise assembly accuracy is required, there are problems in that it takes a lot of time to assemble parts, resulting in high costs and a significant drop in productivity.

This invention was made to solve the above problems, and by making the cam cylinder and sheath shaft into an integral structure, there is no looseness when the cam cylinder rotates and moves in the axial direction, and the cam cylinder The refill can be operated smoothly and the refill can be operated smoothly and reliably by the cam cylinder, and the number of parts can be reduced, making it easy to assemble, improving productivity and reducing costs. Plan,
Another object of the present invention is to provide a composite writing instrument in which the refill can be smoothly projected and retracted by rotating the clip engaged with the sheath shaft.

[Means for solving problems]

The multiple writing instrument according to the present invention integrally includes a cam cylinder in which the rear ends of the first and second refills are press-fitted, and a sheath shaft provided in the cam cylinder and extending forward, By rotating the clip engaged with the sheath shaft, the above-mentioned two-feel is projected and retracted.

[Effect]

In the composite writing instrument of the present invention, when the clip is rotated in one direction, one of the first and second sliders is moved forward and the other is retreated by a cam barrel that rotates together with the clip, and the clip is rotated in one direction. When the cap is rotated in the other direction, one of the first and second sliders retracts and the other protrudes forward in the cam barrel that rotates together with the cap, and when the cap is knocked, the cam barrel rotates together with the cam barrel. moves forward, and the sheath shaft, which is integral with the cam cylinder, is guided in the axial direction by the guide means and moves forward.

〔Example〕

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

In FIG. 1, reference numeral 1 denotes an outer cylinder of a composite writing instrument, and a relay outer cylinder 2 is detachably connected to the rear end of this outer cylinder 1.

As this connecting means, as shown in FIGS. 1 to 4, a large-diameter stepped rear end cylinder portion 10 is formed on the rear end side of the outer cylinder 1, and is formed on the front end side of the intermediate outer cylinder 2. A small-diameter step-shaped tip circular portion 2o is removably press-fitted and connected.

In this case, as shown in FIGS. 5 and 6, the rear end cylinder portion 1
An axial engagement groove 21 provided at a symmetrical position on the outer circumferential surface of the circular tip portion 20 is fitted into and engaged with a rotation preventing protrusion 11 provided at a symmetrical position on the inner circumferential surface of the tip circular portion 20 . As a result, the relay outer cylinder 2 is engaged with the outer cylinder 1 in the axial direction and is prevented from rotating.

Further, the tip circular portion 2o has a shaft insertion hole 22 provided at its axial center as shown in FIGS.
Two sliding holes 23 and 24 (see FIGS. 4 and 5) for inserting a refill are provided at a position 90 degrees displaced from the axial engagement groove 21 with 2 in between.

These sliding holes 23 and 24 have a mechanical pencil shaft 3 (first refill) and a ballpoint pen shaft 4, as shown in the first diagram.
(second refill) is inserted slidably in the axial direction.

Here, as shown in FIGS. 4 and 5, the sliding holes 23 and 24 are arranged so that the mechanical pencil shaft 3 and the ballpoint pen shaft 4 slide smoothly while being bent when they are projected forward. It is formed in an elliptical shape with the major axis in the direction and the diameter gradually increasing on the rear end side.

Note that 23a and 24a shown in FIGS. 1 and 4 are annular protrusions that protrude from the inner circumferential walls of the distal ends of the sliding holes 23 and 24, and lock the front ends of the elastic bodies 34 and 40. At the same time, the mechanical pencil shaft 3 and the ballpoint pen shaft 4 are prevented from being pulled out from the sliding holes 23 and 24.

As shown in the first diagram, the lead guide 31 is removably connected to the tip of the lead pipe 30 inserted into one of the sliding holes 23, so that the mechanical pencil shaft 3 is connected to the outer cylinder 1 from the intermediate outer cylinder. 2, the core pipe 30 is removed from the lead guide 31.
Core replenishment can be performed.

In this mechanical pencil shaft 3, a lead feeding mechanism 32 is arranged on the distal end side of the lead guide 31. The lead feeding mechanism 32 includes a lead chuck, a chuck tightening ring, and a first elastic body 33 (not shown).

On the other hand, the ballpoint pen shaft 4 is detachably connected to the front end of a pen mounting shaft 4o that is slidably inserted into the other sliding hole 24. The ballpoint pen shaft 4 may be connected to the front end of a pen mounting shaft 40 via a pen holder 41, as shown in FIG.

In this case, the pen holder 41 includes a small-diameter shaft portion 40a at the tip end of the pen attachment shaft 40 and a connecting cylinder portion 41A having the smallest diameter, which is connected by press-fitting, adhesive, etc. A large-diameter step-like small-diameter fitting tube portion 41B into which the core pipe 30 can be fitted and connected; and a large-diameter step-like large-diameter fitting tube portion 41B that communicates with this tip and is removably connected to the rear end side of the ballpoint pen shaft 4. It has a structure consisting of a joint tube portion 41G.

With this pen holder 41, its large diameter fitting cylinder portion 41G
By removing the ballpoint pen shaft 4 that has been fitted and connected to the mechanical pencil shaft 3, and fitting and connecting another mechanical pencil shaft with a different core diameter or type from the mechanical pencil shaft 3 to the small diameter fitting tube portion 41B, refill compatibility can be achieved. You can get sex.

At the rear ends of the mechanical pencil shaft 3 and ballpoint pen shaft 4,
As shown in the first figure, cam engagers (sliders) 5 and 6 are integrally connected to each other for pressure engagement with a front end cam surface of a cam cylinder 9, which will be described later.

These cam engagers 5, 6 are shown in FIGS. 3 and 4.

As shown in FIG. 7, it is fitted into axial guide grooves 25 and 26 provided on the inner circumferential surface of the relay outer cylinder 2 to smoothly slide in the axial direction.

Then, the mechanical pencil shaft 3 and the ballpoint pen 1li
III4 is an elastic body 34, 42 interposed between the rear end opening wall surface of the sliding holes 23, 24 and the cam engagers 5, 6.
is urged in the backward direction by

Further, a cap 7 is fitted to the rear end of the relay outer cylinder 2 so as to be detachable in the axial direction, as shown in the first figure. Inside this cap 7 and inside the relay outer cylinder 2, a sheath 8 integrally comprising a cam cylinder 9 is housed so as to be rotatable and slidable in the axial direction.

As shown in FIG. 1 and FIGS. 1 to 15, the sheath 8 includes an eraser storage cylindrical portion 8o, a collar portion 81 that locks the tip of a knock cap 87, which will be described later, and a coaxial tip of an intermediate shaft portion 82. A large-diameter step-shaped cam cylinder 9 integrally formed with the intermediate shaft portion 8
A sheath shaft 83 protrudes from the tip of the cam cylinder 9 and extends forward through the axial center of the cam cylinder 9, and a pair of axial engagement members protrude along the axial direction from the outer peripheral surface of the intermediate shaft portion It has a mating protrusion 84.

The sheath 8 has a clip 1 as shown in the first diagram.
00 is engaged. The free end side of the clip 100 projects outward from an annular hole 7a opened along the circumferential surface of the cap 7, as shown in FIGS. 1, 12 to 15.

The axial engagement protrusion 84 is for engaging the clip 100 and the sheath 8. That is, FIGS. 1 and 12 to 15 (FIG. 15 shows the sheath 8 in dotted lines).
As shown, in the sheath 8 that passes through the insertion hole 101 of the clip 100, the axial engagement protrusion 84 is engaged with the engagement groove 102 of the clip 100, and the clip 100 is rotated in the rotational direction.
and the sheath 8 are integrally rotatable, while the sheath 8 is movable relative to the clip 100 in the axial direction.

Therefore, as will be described later, the sheath 8 and the cam cylinder 9 rotate integrally with the rotation of the clip 100, protrude and retract the mechanical pencil shaft 3 or the ballpoint pen shaft 4, and only the sheath 8 rotates in the axial direction. Since it is movable, it is possible to knock the sheath 8 and feed out the lead of the mechanical pencil shaft 3.

Therefore, in addition to the normal clip function, the clip 100 has the cam tube 9. It has a cam cylinder rotation function that rotates the sheath 8.

Here, as shown in FIG.
and the annular hole 7a of the cap 7, which is passed through the annular hole 7a. That is, as shown in FIG. 15, the annular hole 7a of the cap 7 is open over more than half of the circumference, thereby restricting the clip 100 from being able to rotate approximately 180' left and right. This restricts the cam cylinder 9 from rotating excessively.

Incidentally, as shown in the first figure, a distance a is ensured between the rear wall of the clip 100 and the distal end side of the collar portion 81 of the sheath 8.

This distance a is equal to or longer than a knock claw, and allows smooth lead feeding of the mechanical pencil shaft 3.

The cam cylinder 9 is as shown in FIGS. 9 and 10.

Curved inclined cam surfaces 91.92 on both sides of the front end, tip locking portions 93 provided at the most extreme ends of these curved inclined cam surfaces 91.92, and rear end locking portions of the curved inclined cam surfaces 91.92. 94.

Then, the mechanical pencil shaft 3 is attached to one curved inclined cam surface 91.
The cam engager 5 of the ballpoint pen shaft 4 is attached to the other curved inclined cam surface 92, and the cam engager 6 of the ballpoint pen shaft 4 is attached to the elastic body 3.
They are press-fitted and engaged by urging forces 4 and 42.

Therefore, as shown in FIG. 16, by rotating the cam cylinder 9,
A cam engager 5 is provided at the middle part of the oblique cam surface 91 and 92 around the curve A.
When 6 is held, mechanical pencil shaft 3 and ballpoint pen @4
is housed and held in a retracted position within the front outer cylinder 1.

Also, the cam engager 5 of the mechanical pencil shaft 3 is connected to the tip locking portion 9.
3, the mechanical pencil shaft 3 protrudes, and at the same time, the cam engager 6 of the ballpoint pen shaft 4 engages with the rear end locking portion 94, and the ballpoint pen shaft 4 is held in the retracted storage position. Conversely, the cam engager 5 is attached to the rear end locking portion 9 on the mechanical pencil shaft 3 side.
4, when the cam engager 6 on the ballpoint pen shaft 4 side engages with the tip locking portion 93, the mechanical pencil shaft 3 is held in the storage position and the ballpoint pen shaft 4 is held in the protruding position.

In this manner, the mechanical pencil shaft 3 and the ballpoint pen shaft 4 are alternately moved forward and backward by the rotation of the cam barrel 9, and are housed at the same time.

In FIG. 1, reference numeral 86 denotes an eraser stored in the eraser storage tube 8o, and 87 denotes a knock cap that is removably fitted into the eraser storage tube 8o to cover the eraser 86.

Next, the operation of the above embodiment will be explained. When the clip 100 is rotated in one direction, the cam cylinder 9 is integrally connected to the clip 100 via the sheath 8.
rotates in one direction, and the cam engager 5 of the mechanical pencil shaft 4 moves forward on one curved slanted cam surface 91 toward the tip locking portion 93, as shown in Figure 1G. At the same time, the cam engager 6 of the ballpoint pen shaft 4 moves to the other curved inclined cam surface 92.
By moving the ballpoint pen shaft 4 toward the rear end locking portion 94, the ballpoint pen shaft 4 moves backward. This backward movement is performed by the urging force of the elastic body 52.

Then, the cam engager 5 on the mechanical pencil shaft 3 side is connected to the tip locking portion 93, and the cam engager 5 on the ballpoint pen shaft 4 side
, 6 are respectively engaged with the rear end locking portions 94, and at the same time, one side of the clip 100 is locked to one wall surface of the annular hole 7a of the cap 7, as shown by the dotted line in FIG.

As a result, the unidirectional rotation of the cam barrel 9 is restricted, and at the same time, the mechanical pencil shaft 3 is held in a position protruding from the tip of the outer barrel 1. It is stored and held in the retracted position.

In this state, the knock cap 8 at the rear end of the cap 7
7, the cam cylinder moves forward by a distance M(a) via the sheath 8.

At this time, the cam barrel 9 advances the cam latch 5 of the mechanical pencil shaft 3, thereby pushing the lead pipe 30 forward, and the lead feeding mechanism 32 operates to feed the lead.

When the clip 100 is rotated in the other direction from this state, the cam cylinder 9 is rotated in the other direction together with the clip 100 through the sheath 8, and the cam cylinder 9 rotates along one curved inclined cam surface 91 of the cam cylinder 9. At the same time that the cam engager 56 on the mechanical pencil shaft 3 side is moved backward by the urging force of the elastic body 34, the cam engager 6 on the ballpoint pen shaft 4 side is pushed forward by the other curved inclined cam barrel 92 of the cam barrel 9. .

Then, the ballpoint pen shaft 4 moves forward and protrudes, and at the same time, the cam engager 6 engages with the tip locking part 93 at that position, and at the same time, as shown by the dotted line in FIG. It is locked to the other wall surface of the annular hole 7a. As a result, the axial engagement protrusion 84 is connected to the relay outer cylinder 2.
By engaging with the stopper surface 28a on the ballpoint pen delivery side, rotation of the cam cylinder 9 in the other direction is restricted. Then, at the same time that the ballpoint pen shaft 4 is held at the writing position protruding from the outer cylinder 1, the mechanical pencil shaft 3 is retreated and stored.

In the above embodiment, the outer cylinder 1 and the relay outer cylinder 2 are bridged separately, but the outer WJ king may be formed long and the relay outer cylinder 2 may be omitted.

〔Effect of the invention〕

As described above, according to the present invention, the cam cylinder and the sheath shaft are integrally constructed, and the sheath shaft is slidably inserted into the guide means of the refill, so that when the cam cylinder rotates and the axial direction Since there is no backlash during movement and the cam cylinder can be operated smoothly, the refill can be smoothly and reliably extended and retracted by the cam cylinder.

In addition, as mentioned above, since the cam cylinder and sheath shaft are integrated, the number of parts is reduced, the structure is simplified, and parts can be assembled easily and easily, improving productivity and reducing costs. can be achieved.

Furthermore, by rotating the clip, the refill can be easily and smoothly extended and retracted.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a composite writing implement according to an embodiment of the present invention, FIG. 2 is a side view of the outer case and the relay outer case being removed and arranged coaxially, and FIG. Figure 4 is a sectional view taken along line VI-VI in Figure 3, Figure 5 is a sectional view taken along line ■-■ in Figure 3, Figure 6 is a sectional view taken along line ■-■ in Figure 3, and Figure 7 is a sectional view taken along line 4 Fig. 8 is a longitudinal sectional view of the holder, Fig. 9 is a plan view of the cam cylinder, Fig. 10 is a sectional view taken along the line X-X of Fig. 9, and Fig. 11 is a sectional view of the XI-X [line sectional view, 1st
Figure 2 is a plan view of the clip, Figure 13 is a side view of the same, and Figure 14 is a top view of the clip.
15 is a cross-sectional view of the cap taken along the y-y line in FIG. 1, and FIG. 16 is an explanatory view of the unfolding action of the cam cylinder. In the figure, 1 is an outer cylinder, 3 is a first refill, 4 is a second refill, 7 is a cap, 9 is a cam cylinder, 22 is a guide means, 83 is a sheath shaft, and 100 is a clip. Marshal Go Dekatsu, Tomo Co., Ltd. Mugi-m-(,riF2.ru,)

Claims (1)

[Claims] In a composite writing instrument in which a first refill (3) and a second refill (4) that are slidably inserted in the axial direction inside the outer cylinder (1) are alternately protruded and retracted, the outer cylinder (1) said first and second refills (3), (
4) is slidably inserted in the axial direction.
), and a cam provided in the cap (7) so as to be rotatable in synchronization with the cap (7), and the rear ends of the first and second refills (3) and (4) are press-fitted and engaged. Tube (9)
and a sheath shaft (83) provided on the cam cylinder (9), extending forward, and slidably inserted into the guide means (22) in the axial direction, and engaged with the sheath shaft (83). Clip (1)
00), the sheath shaft (83) and the cam cylinder (9).
The first and second refills (3) and (4) are alternately protruded and retracted via the cam cylinder (9) by rotation of the clip (100), and ,
By knocking the cap (7), the cam cylinder (9)
A composite writing instrument characterized in that the sheath shaft (83) is moved in the axial direction together with the sheath shaft (83).