JPH0811477B2 - Compound writing instrument - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a compound writing instrument having first and second refills, such as two types of mechanical pencils having different core diameters, or a combination of a mechanical pencil and a ballpoint pen, and particularly to the first and second refills. The present invention relates to an improvement of a composite writing instrument provided with a cam tube that alternately projects and retracts a tongue.

[Prior art]

This type of conventional compound writing instrument has a sheath connected to the rear end of an outer cylinder and slidably attached to a mechanical pencil shaft and a ballpoint pen shaft in the axial direction, and to the rear end of the outer cylinder through the sheath. The outer cylinder comprises a combination of a rotatably connected cap and a cam cylinder rotatably fitted and supported by the sheath shaft of the sheath and engaged in the axial direction in the outer cylinder. By bringing them together, the cam cylinder that rotates integrally with the outer cylinder alternately projects the mechanical pencil shaft and the ballpoint pen shaft from the tip of the outer cylinder.
It is designed to be retired.

[Problems to be Solved by the Invention]

In such a conventional compound writing instrument, since the cam barrel and the sheath have a separate structure, precise concentricity is required at the time of assembling them, and at the time of use after assembling, the above-mentioned cam barrel is used. When the cam cylinder is rotated and moved in the axial direction, the cam cylinder is apt to rattle between itself and the sheath shaft, and the cam cylinder cannot be operated smoothly. Therefore, the mechanical pencil shaft and the ballpoint pen shaft are alternately and smoothly moved. There is a problem that the function of the composite writing instrument deteriorates because it cannot be projected or retracted. Further, as described above, since the cam barrel and the sheath are separate bodies,
The number of parts is large, the structure is complicated, and moreover, as described above, since precise assembly accuracy is required, a lot of man-hours are required for assembling the parts, resulting in a high cost and a drastic decrease in productivity. There were also problems. The present invention has been made to solve the above-mentioned problems, and the cam cylinder and the sheath shaft or the cam cylinder, the sheath shaft, and the cap are integrally formed, so that the cam cylinder can rotate and move in the axial direction. Since there is no backlash, the cam cylinder can be operated smoothly, smooth and reliable operation of the refill by the cam cylinder can be obtained, and further, the number of parts can be reduced and the assembly can be easily and easily performed. Another object of the present invention is to provide a composite brush tool that can improve productivity and reduce costs.

[Means for solving problems]

In the compound writing instrument according to the present invention, a cap is rotatably and detachably connected to a rear end of an outer cylinder into which first and second refills are slidably inserted in an axial direction, and the cap is synchronously rotated. A cam barrel movably provided with the rear ends of the first and second refills brought into pressure contact with each other, and a sheath shaft provided on the cam barrel and extending forward, are integrally configured, The sheath shaft is slidably inserted in the axial direction in a guide means in which the first and second refills are slidably inserted in the outer cylinder.

[Work]

In the compound writing instrument of the present invention, when the cap is rotated in one direction, one of the first and second sliders moves forward and the other moves backward with the cam barrel that rotates integrally with the cap, and
When the cap is rotated in the other direction, one of the first slider and the second slider retracts in the cam cylinder that rotates together with the cap and the other protrudes forward, and when the cap is knocked, it is integrated with this. The cam barrel advances, and the sheath shaft integral with the cam barrel is axially guided by the guide means to move forward.

【Example】

An embodiment of the present invention will be described below with reference to the drawings. 1 to 14 show the first embodiment. In the figure, 1
Is an outer cylinder of the compound writing instrument, and a relay outer cylinder 2 is detachably connected to the rear end of the outer cylinder 1. As the connecting means, a small-diameter step-shaped circular tip portion 20 formed on the front end side of the relay outer cylinder 2 is provided in a rear-end cylindrical portion 10 of a large-diameter step formed on the rear end side of the outer cylinder 1. Is press-fitted and connected detachably. In this case, as shown in FIG. 5 and FIG.
An axial engaging groove 21 provided at a symmetrical position on the outer peripheral surface of the tip circular portion 20 is engaged with a rotation preventing projection 11 provided at a symmetrical position on the inner peripheral surface of 10 by fitting or screwing. This allows
The relay outer cylinder 2 is engaged with the outer cylinder 1 in the axial direction so as not to rotate. Further, as shown in FIGS. 3 to 7, the tip circular portion 20 has a shaft insertion hole 22 provided in the axial center portion thereof, and the axial engagement grooves 21 to 90 sandwiching the shaft insertion hole 22. 2 slide holes 23, 24 for inserting the refills (Figs. 2, 6
(See FIG. 7). As shown in FIGS. 1 and 2, the mechanical pen shaft 3 (first refill) and the ballpoint pen shaft 4 (second refill) are slidably movable in these sliding holes 23 and 24 in the axial direction. Has been inserted. Here, as shown in FIGS. 6 and 7, the sliding holes 23 and 24 are formed so that the mechanical pencil shaft 3 and the ballpoint pen shaft 4 slide smoothly while flexing when projecting forward. It is formed in an elliptical shape having a major axis in the scenery direction and a progressively larger diameter on the rear end side. Reference numerals 23a and 24a shown in FIG. 6 are annular projections projectingly provided on the inner peripheral walls at the tips of the sliding holes 23 and 24. , 24 to prevent the mechanical pencil shaft 3 and the ballpoint pen shaft 4 from being pulled out. Since the lead guide 31 of the mechanical pencil shaft 3 is detachably connected to the tip of the core pipe 30 inserted into the one sliding hole 23, after the relay outer cylinder 2 is removed from the outer cylinder 1, By extracting the lead pipe 30 from the lead guide 31, it is possible to replenish the lead to the lead pipe 30. In the mechanical pencil shaft 3, a lead feeding mechanism 32 is arranged on the tip side of the lead guy 31. The lead delivery mechanism 32 has a lead chuck, a chuck tightening ring, and a first elastic body 33, which are not shown. On the other hand, the ball-point pen shaft 4 is detachably connected to the front end of the pen mounting shaft 40 slidably inserted in the other sliding hole 24. The ball-point pen shaft 4 may be connected to the front end of the pen mounting shaft 40 via a pen holder 41 as shown in FIG. In this case, the pen holder 41 is connected to the tip end small diameter shaft portion 40a of the pen mounting shaft 40 by press fitting, bonding or the like, and the connecting cylinder portion 41A having the smallest diameter. A large-diameter step-like small-diameter fitting tubular portion 41B into which the core pipe 30 can be fitted and connected, and a large-diameter step-like large-diameter fitting in which the rear end side of the ball-point pen shaft 4 is detachably connected to the tip thereof. It is configured to include the coupling cylinder portion 41C. With such a pen holder 41, the ball-point pen shaft 4 fitted and connected to the large-diameter fitting cylinder part 41C is pulled out, and another mechanical pencil having a core diameter or a different type from the mechanical pencil shaft 3 is attached to the small-diameter fitting cylinder part. Refit compatibility can be obtained by mating and connecting with 41B. Cam engaging elements (sliders) 5 and 6 for press-contacting and engaging with a front end cam surface of a cam barrel 9 described later are integrally connected to the respective rear ends of the mechanical pencil shaft 3 and the ballpoint pen shaft 4. As shown in FIGS. 5, 6, and 9, these cam engagement elements 5 and 6 are fitted in the axial guide grooves 25 and 26 provided on the inner peripheral surface of the relay outer cylinder 2. It is designed to slide smoothly in the axial direction. Further, the mechanical pencil shaft 3 and the ballpoint pen shaft 4 described above.
Is the rear end opening wall surface of the sliding holes 23, 24 and the cam engaging element.
The elastic members 34, 42 interposed between the members 5 and 6 are urged in the backward direction. A semi-cylindrical portion 28 is formed on the rear end side of the relay outer cylinder 2 as shown in FIGS. 3 and 4. One side surface of the semi-cylindrical portion 28 serves as a stopper surface 28a on the ball-point pen delivery side that regulates rotation of the cam barrel 9 in one direction, which will be described later, and the other end side of the semi-cylindrical portion 28 is the cam barrel 9. It is a stopper surface 28b on the mechanical pencil sending side that regulates rotation in the other direction. The stopper surface 28a on the mechanical pencil sending side is provided with an axial locking step portion 28c that restricts the forward movement of the cam barrel 9. Here, as shown in FIGS. 1 to 3, a distance (a) is provided between the rear end surface 2a of the relay outer cylinder 2 and the axial locking step portion 28c at the front end of the semi-cylindrical portion 28. Has been. This distance (a) serves as the core delivery knocking allowance of the mechanical pencil shaft 3. On the rear end portion of the relay outer cylinder 2, a penetrating cylindrical cap 7 having a clip 7a is externally fitted so as to be rotatable and axially slidable. A sheath 8 is inserted and housed in the cap 7 by press fitting, fitting, etc. and locked in the axial direction, and a cam cylinder 9 integrally formed at the front end of the sheath 8 rotates in the relay outer cylinder 2. It is inserted so as to be movable and slidable in the axial direction. As shown in FIGS. 1 to 3, 11 and 13, the sheath 8 has an eraser housing cylindrical portion 80 and a large-diameter stepped circular stepped portion 81 integrally formed on the outer peripheral surface of the front end side. And the circular step 81 is engaged in the cap 7. As the engaging means, as shown in the thirteenth illustration, a convex portion 7b integrally provided on the inner peripheral surface on the rear end side of the cap 7 is provided in a concave portion 81a formed on the outer peripheral portion of the circular stepped portion 81. It is fitted and engaged so as to be slidable in the direction. As a result, the sheath 8 is engaged with the cap 7 in the axial direction so that the cap 7 and the sheath 8 can rotate integrally.
Moreover, it is slidable in the axial direction. The cap 7
It is also possible to provide a concave portion 81a in the and a convex portion 7b in the circular stepped portion 81, respectively, and fit and engage them. Although not shown, the cap 7, the sheath 2 and the cam barrel 9 can be integrally molded at the same time, in which case the number of parts can be reduced and the assembly process can be simplified. A small-diameter stepped intermediate shaft portion 82 is integrally formed at the front end of the circular stepped portion 81, and a large-diameter stepped cam cylinder 9 is integrally provided coaxially with the tip end of the intermediate shaft portion 82. Therefore, the cam shaft 9 can rotate integrally with the sheath 8 and can slide in the axial direction. Then, on the cam surface of the cam barrel 9, the cam engaging elements 5, 6 of the mechanical pencil shaft 3 and the ballpoint pen shaft 4 are attached to the elastic bodies 34, 6.
The urging force of 42 causes pressure contact engagement. A sheath shaft 83 is integrally formed at the tip of the intermediate shaft portion 82 and extends forward through the axial center portion of the cam cylinder 9. The sheath shaft 83 is inserted into the relay outer cylinder 2 from the rear end side and is slidably inserted in the shaft insertion hole 22 on the front end side of the relay outer cylinder 2 in the axial direction so that the sheath 8 and An integral cam cylinder 9 is housed in the relay outer cylinder 2 so as to be rotatable and axially slidable. Here, as shown in FIGS. 1 to 3, a pis 85 is screwed onto the tip of the sheath shaft 83 so that the sheath shaft 83 and the cam cylinder 9 do not come out of the relay outer cylinder 2. It has become. Instead of the screw 85, a squid-shaped press-fitting member may be used and press-fitted to the tip of the sheath shaft 83. An axial engagement projection 84 is integrally provided on the outer peripheral surface of the intermediate shaft portion 82 as shown in the third drawing. The axial engagement projections 84 regulate the rotation and axial movement of the cam barrel 9, and are engaged with the stopper surfaces 28a, 28c on the ball-point pen delivery side when the cam barrel 9 rotates in one direction. The one-way rotation of the cam barrel 9 is restricted at a position where the ballpoint pen shaft 4 projects from the tip of the outer cylinder 1 and the mechanical pencil shaft 3 is retracted and housed in the outer cylinder 1. At the same time, the forward end of the axial engagement projection 84 engages with the axial locking step 28c, thereby restricting the forward movement of the cam barrel 9. The axial engagement projection 84 engages with the stopper surface 28b on the mechanical pencil sending side when the cam barrel 9 rotates in the other direction, so that the ball-point pen shaft 4 is retracted into the outer cylinder 1 and the mechanical pencil is pushed. The cam cylinder 9 is prevented from rotating in the other direction at a position where the shaft 3 projects from the tip of the outer cylinder 1. In this state, the axial engagement projection 84 can move forward along the stopper surface 28b on the mechanical pencil sending side by the distance (a), and thus knock forward of the cam barrel 9 is allowed. As shown in FIGS. 1 to 3, and also FIGS. 11 and 12 and 13, the cam barrel 9 has curved inclined cam surfaces 91 and 92 on both sides of the front end portion and these curved inclined cam surfaces. The tip locking portion 93 provided at the tip of the 91, 92 and the curved inclined cam surface 91, 92
And a rear end locking portion 94. Then, on one curved inclined cam surface 91, the mechanical pencil shaft 3
Of the elastic member 34, 4 and the cam engaging member 5 of the ball-point pen shaft 4 on the other curved inclined cam surface 92, respectively.
It is pressed into contact with the urging force of 2. Therefore, as shown in FIG. 14, by rotating the cam barrel 9,
When the cam engaging elements 5 and 6 are held in the middle portions of the curved inclined cam surfaces 91 and 92, the mechanical pencil shaft 3 and the ballpoint pen shaft 4 are housed and held in the retracted position in the front outer cylinder 1. Further, the cam engaging element 5 of the mechanical pencil shaft 3 is a tip locking portion.
When it engages with 93, the mechanical pencil shaft 3 protrudes, and at the same time, the cam engaging element 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. On the contrary, the cam engaging element 5 on the mechanical pencil shaft 3 side is the rear end locking portion 94
In addition, the ball engagement element 6 on the side of the ball-point pen shaft 4 has
When engaged with 93, the mechanical pencil shaft 3 is held in the storage position and the ballpoint pen shaft 4 is held in the projecting position. Thus, the rotation of the cam barrel 9 causes the mechanical pencil shaft 3 and the ballpoint pen shaft 4 to alternately move forward and backward, and they can be housed at the same time. In FIG. 1 and FIG. 2, 86 is an eraser housed in the eraser storage cylinder 80, and 87 is an eraser storage cylinder.
A knock cap that is detachably fitted to 80 and covers the eraser 86. Next, the operation of the above embodiment will be described. When the cap 7 is rotated in one direction, the cam cylinder 9 is rotated in one direction via the sheath 8 integrally with the cap 7, and the cam engagement element 5 of the mechanical pencil shaft 4 is moved to the first position.
14 As shown in the figure, attach one curved sloped cam surface 91 to the tip locking portion 93.
Move forward to the side. At the same time, the cam engaging element 6 of the ball-point pen shaft 4 moves on the other curved inclined cam surface 92 toward the rear end locking portion 94, whereby the ball-point pen shaft 4 moves backward. This backward movement is performed by the urging force of the elastic body 42. The cam engaging element 5 on the mechanical pencil shaft 3 side is attached to the tip locking portion 93, and the cam engaging element 6 on the ballpoint pen shaft 4 side.
Simultaneously engages with the rear end locking portion 94, and at the same time, the axial engagement projection 84 engages with the stopper surface 28b on the mechanical pencil sending side. As a result, the one-directional rotation of the cam barrel 9 is restricted, at the same time, the mechanical pencil shaft 3 is held in a position projecting from the tip of the outer barrel 1, and the ballpoint pen shaft 4 is held in the outer barrel 1.
It is stored and held in the retracted position. In this state, when the cap 7 or the knock cap 87 at the rear end of the cap 7 is knocked, the cam cylinder 9 moves forward through the sheath 8 by the distance (a). At this time, the cam cylinder 9 causes the cam engagement element 5 of the mechanical pencil shaft 3 to move.
Is advanced, the lead pipe 30 is pushed forward, and the lead feeding mechanism 32 operates to perform lead feeding. From this state, if the cap 7 is rotated in the other direction,
The cam cylinder 9 rotates in the other direction through the sheath 8 integrally with this,
The cam engaging element 5 on the mechanical pen shaft 3 side moves backward along the one curved inclined cam surface 91 of the cam barrel 9 by the urging force of the elastic body 34, and at the same time, the other curved inclined cam surface 92 of the cam barrel 9 is moved. Then, the cam engaging element 6 on the ball-point pen shaft 4 side is pushed forward. As a result, the ball-point pen shaft 4 moves forward and protrudes, and at that position, the cam engaging element 6 engages with the tip locking portion 93, and at the same time, the axial engaging projection 84 causes the ball-pen delivery side stopper surface of the relay outer cylinder 2. By engaging with the cam 28a, rotation of the cam cylinder 9 in the other direction is restricted, and by engaging the axial engaging projection 84 with the axial engaging step 28c as well, Forward movement is restricted. Then, the ball-point pen shaft 4 is held at the writing position protruding from the outer cylinder 1, and at the same time, the mechanical pencil shaft 3 is retracted and stored. FIG. 15 shows a second embodiment of the present invention. In this embodiment, the relay outer cylinder 2 in the first embodiment is removed to form the outer cylinder 1 long, and the outer cylinder 1 is provided with the cam cylinder 9 integrated with the sheath 8 as in the case of the first embodiment. It is installed in the same way. Therefore, the same parts as those in the first embodiment are designated by the same reference numerals, and the detailed description of the configuration and the operation thereof will be omitted. FIG. 16 shows a third embodiment of the present invention. In this embodiment, the cap 7 and the cam barrel 9 are integrally structured. That is, the rear end of the cam cylinder 9 is connected to the inside of the rear end of the cap 7 by integral molding. Here, it is of course possible to integrally form the cam cylinder 9 and the sheath shaft 83 on the cap 7 by means of using a screw 85, but the sheath shaft 83 is formed separately from the cam cylinder 9 and The rear end side of the sheath shaft 83 is inserted from the front into a shaft insertion hole 9a provided in the rear end wall portion of the cam barrel 9, and the locking claw 83a formed at the rear end of the sheath shaft 83 is inserted into the shaft insertion hole 9a.
There is also a connecting means for integrally connecting the cam barrel 9 and the sheath shaft 83 by engaging with the rear end wall surface. As a result, the cap 7 and the cam cylinder 9 can be integrally molded and the sheath shaft 83 can be molded very easily.

【The invention's effect】

As described above, according to the present invention, the cam barrel and the sheath shaft, or the sheath shaft and the cap of the cam barrel are integrally formed, and the sheath shaft is slidably inserted into the guide means of the refill, thereby Since there is no backlash when the cam barrel is rotated and when the cam barrel is moved in the axial direction, the cam barrel can be operated smoothly, so that the protrusion and retraction operation of the refill by the cam barrel can be performed smoothly and reliably. Further, as described above, since the cam barrel and the sheath shaft or the cam barrel, the sheath shaft and the cap are integrated, the number of parts can be reduced, the structure can be simplified, and the parts can be easily and easily assembled. As a result, productivity can be improved and cost can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of a composite writing instrument according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view of the same part, and FIG. 3 is a perspective view showing a related configuration of a relay outer cylinder and a cam cylinder. The figure is a side view in which the outer cylinder and the relay outer cylinder are removed and arranged coaxially, FIG. 5 is the same sectional view, FIG. 6 is a sectional view taken along line VI-VI of FIG. 5, and FIG. Fig. VII-VII sectional view, Fig. 8 is Fig. 5 VIII-
VIII line sectional view, FIG. 9 is a IX-IX line sectional view of FIG. 6, 10
Figure is a cross-sectional view of the pen holder, Figure 11 is a plan view of the cam barrel,
FIG. 12 is a sectional view taken along line XX of FIG. 11, and FIG. 13 is Y of FIG.
14 is a cross-sectional view taken along the line Y, FIG.
FIG. 16 is a sectional view of a cam cylinder forming portion according to the second embodiment,
The figure is a cross-sectional view of the cap of the third embodiment. 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, 83 is a sheath shaft, and 22 is a guide means.

Claims (2)

[Claims] 1. A cap (7) which is rotatable on the rear end of the outer cylinder (1) and which is detachably connected to the outer cylinder (1) is slidable in the outer cylinder (1) in the axial direction. 1st, 2nd inserted in
A writing instrument for alternately projecting and retracting the refills (3), (4) of the above, the first and second refills (3), (4) provided in the outer cylinder (1) are axially arranged. And a guide means (22) slidably inserted into the cap and a cap (7) provided so as to be rotatable in synchronism with the cap (7), and the first and second refills (3), (4). )
A cam cylinder (9) having its rear ends press-engaged with each other, and the guide means (2) provided on the cam cylinder (9) and extending forward.
2) is provided with a sheath shaft (83) slidably inserted in the axial direction, and the cam barrel (9) of the sheath shaft (83) is integrally configured to rotate the cap (7). By movement, the first and second refills (3), (4) are alternately projected and retracted through the cam barrel (9), and the cam barrel is knocked by the knock of the cap (7). A composite writing instrument, wherein the sheath shaft (83) is axially moved integrally with (9). 2. The composite writing instrument according to claim 1, wherein the cap (7) is integrally formed on a sheath shaft (83) integrally formed with the cam barrel (9).