JP3074348B2 - Composite writing instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite writing instrument having a slider for alternately projecting and retracting first and second refills, such as two types of mechanical pencils having different core diameters or a combination of mechanical pencils and ballpoint pens.

[Prior art]

As a conventional composite writing instrument, there is one described in Japanese Patent Application No. 61-184317 (Japanese Patent Application Laid-Open No. 63-41198), which is a prior application of the present applicant. explain. First, as shown in FIG. 10, a rear outer cylinder 3 is connected to a rear end of the front outer cylinder 1 via a sheath 2 so as to be freely rotatable forward and backward and removably. It is also possible to move in the axial direction so that knock operation can be performed. The sheath 2 is, as shown in FIGS. 10 and 13 to 16,
An outer threaded cylindrical portion 20 detachably screwed to the inner threaded portion 10 at the rear end of the front outer cylinder 1; It has a large-diameter stepped front circular step 21 abuttingly engaged with the rear end, and a small-diameter stepped cylindrical part 22 integrally connected coaxially to the rear end of the front circular step 21. On the rear end coaxially of this cylindrical portion 22, a flat sheath shaft portion 23 is provided.
The rear end of the sheath shaft portion 23 has a large-diameter stepped rear circular step portion.
A small-diameter stepped engagement shaft portion 25 is integrally formed coaxially at the rear end of the rear circular step portion 24. The engagement shaft portion 25 is formed in two split cylindrical shapes, and has a locking claw 25a at a rear end. The front circular step portion 21 has a structure shown in FIGS.
As shown in the figure, two sliding holes 26 and 27 communicating with the outer threaded cylindrical portion 20 and the cylindrical portion 22 at the axial center symmetric position are provided. A mechanical pencil shaft (first refill) 4 and a ballpoint pen shaft (second refill) 5 are slidably inserted in these sliding holes 26 and 27 in the axial direction. As shown in FIG. 21, the mechanical pencil shaft 4 has a lead guide 41 removably inserted and connected to the tip of a core pipe 40 inserted into the one slide hole 26. After removing from the front outer cylinder 1, the core pipe
By extracting 40 from the lead guide 41, refilling of the core pipe 40 can be performed. In such a mechanical pencil shaft 4, a lead guide
A lead sending mechanism 42 is arranged on the tip side of 41. The lead sending mechanism 42 includes a lead chuck 43 and a chuck tightening ring.
It has a configuration having a 44 and a first elastic body 45. On the other hand, the ball-point pen shaft 5 has a front-end large-diameter fitting cylindrical portion 51B of a pen holder 51 integrally connected to a front end of a pen mounting shaft 50 slidably inserted into the other slide hole 27, and a rear end side thereof. It is configured to be detachably inserted and connected. Sliders 6 and 7 are connected to the rear ends of the mechanical pencil shaft 4 and the ballpoint pen shaft 5, respectively. Then, the mechanical pencil shaft 4 and the ballpoint pen shaft 5
Are always urged in the backward direction by the elastic bodies 46 and 52 interposed between the respective sliders 6 and 7 and the rear end of the front circular step portion 21 of the sheath 2, whereby the respective sliders The rear end of each of the members 6 and 7 abuts on the front end of the rear circular step portion 24 of the sheath shaft portion 23, and further retreating is restricted. Here, each of the sliding holes 26 and 27 has a hole diameter allowing the axial movement of each of the inserted core pipe 40 of the mechanical pencil shaft 4 and the pen mounting shaft 50 of the ballpoint pen shaft 5, and Lead guide for mechanical pencil shaft 4
The outer diameter of the large-diameter fitting tubular portion 51B of the pen holder 51 and the pen holder 51 of the five systems of the ballpoint pen and the elastic bodies 46 and 52 is smaller than the respective outer diameters. Therefore, with respect to the sheath 2, the mechanical pencil shaft 4
When assembling the ball-point pen shaft 5 with the mechanical pencil shaft 4, the lead guide 41 is pulled out from the tip of the core pipe 40, and the elastic pipe 46 is fitted to the core pipe 40. After inserting and inserting the lead 40 into the sliding hole 26 from the rear side from the front end side, the lead guide 41 must be inserted and connected to the front end of the core pipe 40. The mechanical pencil shaft 4 cannot be assembled. In the ball-point pen shaft 5, the slider 7 is removed from the rear end of the pen mounting shaft 50, and the pen mounting shaft 50 is pulled out of the other sliding hole 27 from the rear end side with the elastic body 52 removed. After inserting and inserting the elastic body 52 into the pen mounting shaft 50 from the rear end side, and then attaching the slider 7 of the system to the rear end of the pen mounting shaft 50. However, the assembly of the pen mounting shaft 50 to the sheath 2 cannot be performed. On the other hand, each of the sliders 6 and 7 is made of a halved circular member and is combined into a circular cross section as shown in FIGS. ~ 19th
As shown in FIG. 23 and FIG. 23, the axial sliding groove 6
0, 70 and a bottom U-shaped cross-section U-shaped refill support hole 60b, 70b provided in the longitudinal direction of the bottom of each of the axial sliding grooves 60, 70, and having a middle portion in the longitudinal direction separated by partition walls 60a, 70a. Are provided. In addition, locking claw portions 60c, 70c (see FIG. 19) are provided at the edges of the open ends of the refill support holes 60b, 70b. Then, the rear ends of the core pipe 40 and the pen mounting shaft 50 are fitted into the refill support holes 60b, 70b, and the locking claws 60c, 70c are elastically engaged with the rear ends thereof. Sliders 6 and 7 of respective systems are detachably connected to respective rear ends of the core pipe 40 and the pen mounting shaft 50. In this case, retaining steps 40a, 50a are provided on the respective rear end sides of the core pipe 40 and the pen mounting shaft 50, and these retaining steps 40a, 50a are provided with the refill support holes 60b, 7a.
0b is in contact with the inside of the opening edge of the tip. In addition, the axial sliding grooves 60, 70 have the sheath shaft portion 23 fitted from above and below and hold the sheath shaft portion 23, so that the sliders 6, 7 can be moved by using the sheath shaft portion 23 as a guide. Each of the mechanical pencil shaft 4 and the ballpoint pen shaft 5 can be individually slid in the axial direction. In this manner, with the sheath 2, the mechanical pencil shaft 4, the ballpoint pen shaft 5, the sliders 6, 7 and the like being unitized, the outer threaded cylinder 20 of the sheath 2 is connected to the front outer cylinder 1
Then, the front end side of the rear outer cylinder 3 is rotatably fitted to the rear end side of the front outer cylinder 1. At this time, the shaft insertion hole 35 of the rear outer cylinder 3 is pressed into the engagement shaft portion 25 of the sheath 2 from the distal end side of the locking claw 25a, so that the locking claw 25a is inserted into the shaft insertion hole 35. And is locked to the rear end face of the shaft insertion hole 35. In this state, the top screw 8 is screwed into the inner screw hole 36 on the rear end side of the rear outer cylinder 3, and the protrusion shaft portion 8 a of the top screw 8 is inserted into the engagement shaft portion 25. The press-fitting engagement of the locking claw 25a with the shaft insertion hole 35 is further reliably and firmly performed. In addition, the ceiling screw 8 fastens the annular base of the clip 9 to the rear end of the rear outer cylinder 3 together. In this manner, in a state where the entire writing implement is assembled, the sliders 6, 7 are urged backward by the elastic members 46, 52 of the respective systems, and the cams formed on the outer peripheral surfaces of the sliders 6, 7 are formed. The front end opposing surfaces of the surfaces 61 and 71 are engaged with the cam engaging projections 34 integral with the rear outer cylinder 3 by pressure contact. That is, as shown in FIG. 22, in the state where the sliders 6 and 7 are united in a cylindrical shape at the retracted position, the cam surfaces 61 and 71 are in a short-circuit state in which the respective front ends are tapered, and It is gradually and symmetrically curved and inclined in the axial direction along the end side axial direction. Next, the operation will be described. The mechanical pencil shaft 4 and the ballpoint pen shaft 5 are retracted and stored in the front outer cylinder 1.
In the state shown in FIGS. 10 and 21, when the rear outer cylinder 3 is rotated in one direction, the cam engaging projection 34 integrated with the outer cylinder 3 moves the cam surface 61 of the slider 6 on the mechanical pencil shaft 4 side, for example, to the distal end. The slider 6 moves forward against the elastic body 46 by being pressed and slid toward the rear end locking portion 61a.
Thereby, the mechanical pencil shaft 4 integrated with the slider 6 advances and projects from the front outer cylinder 1. Then, the mechanical engagement shaft 34 is engaged with the rear end locking portion 61a of the cam surface 61, whereby the mechanical pencil shaft 4 is held in a writing state. In this writing state, when the rear outer cylinder 3 is knocked,
When the slider 6 further moves forward via the cam engaging protrusion 34 engaged with the rear end locking portion 61a of the cam surface 61, the centering of the mechanical pencil shaft 4 is performed. When the rear outer cylinder 3 is rotated in the reverse direction from the writing state, the engagement between the cam engaging projection 34 and the rear end locking portion 61a is released, and the cam engaging projection 34 By rotating in the direction away from the surface 61, the slider 6 moves backward by the urging force of the elastic body 46. By this retreating movement, the mechanical pencil shaft 4 is retracted and retracted, and in the retracted position, the cam engaging projection 34 returns to the state in which the cam surface 61 is engaged with the distal end side. When the rear outer cylinder 3 is rotated in the other direction from this state, the cam engaging projection 34 turns the cam surface 71 of the slider 7 on the ballpoint pen shaft 5 side toward the rear end locking portion 71a of the system. By pressing and sliding, the other slider 7 moves forward, and the ballpoint pen shaft 5 integral with the slider 7 projects to the writing position. At the writing position, the cam surface 71 comes into contact with the rear end locking portion 71a of the cam surface 71. The engagement projections 34 engage to hold the ballpoint pen shaft 5 in a locked state. When the rear outer cylinder 3 is rotated in the reverse direction in this state, the slider 7 of the ballpoint pen 5 system moves backward as in the case of the mechanical pencil shaft 4 and the ballpoint pen 5
Is stored.

[Problems to be solved by the invention]

The conventional composite writing instrument is configured as described above, and the sliding holes 26 and 27 of the sheath 2 are provided with the lead guide 41 of the mechanical pencil shaft 4.
And the outer diameter of each of the elastic bodies 46 and 52 are smaller than the outer diameter of the large-diameter fitting cylindrical portion 51B of the tip holder 51 of the pen holder 51 and the ballpoint pen shaft 5, so that in the system of the mechanical pencil shaft 4, With the lead guide 41, the elastic body 46, and the slider 6 attached to the core pipe 40, the sheath 2
Cannot be inserted into the sliding hole 26 of the ball-point pen shaft 5, and even in the system of the ball-point pen shaft 5, the elastic body 52 of the system, the slider 7, and the ball-point pen shaft 5 are assembled to the pen mounting shaft 50. The system cannot be inserted into the sliding hole 27 of the system, and therefore, a lot of trouble and time are required for assembling the mechanical pencil shaft 4 and the ball-point pen shaft 5 with respect to the sheath 2, resulting in very poor assembly efficiency. The problem arose. Further, since the sheath shaft portion 23 of the sheath 2 is merely a flat plate, the forward and backward movements of the mechanical pencil shaft 4 and the ballpoint pen shaft 5 guided along the sheath shaft portion 23 are unstable. There is a risk that the Further, since the midway portions of the refill support holes 60b and 70b provided in the sliders 6 and 7 are separated by the partition walls 60a and 70a, the center pipe 40 is provided correspondingly to the mechanical pencil shaft 4. It must be short, and in the case of the ballpoint pen shaft 5, the refill support hole of this system
The ball-point pen shaft 5 is connected via a pen-mounting shaft 50 whose rear end is fitted and connected to 70b.
However, there has been a problem that the ink storage capacity is further reduced and the ink storage capacity is reduced. The elastic bodies 46 and 52 of the respective systems of the mechanical pencil shaft 4 and the ballpoint pen shaft 5 are simply sliders.
Since the elastic members 46 and 52 are only interposed between the front ends of the sheaths 6 and 7 and the front circular step portion 21 of the sheath 2, the elastic bodies 46 and 52 are deformed so as to escape radially outward upon compression, and as a result, the mechanical pencil shaft 4
There is also a problem that the knocking operation at the time of sending out the lead during use is not performed smoothly. SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. The first and second refills can be easily assembled to a sheath, and the refills can be smoothly moved back and forth along the sheath. It is an object of the present invention to provide a composite writing instrument that can move forward and backward, can increase the total length of each refill without changing the entire length of the writing instrument, and can stably hold an elastic body.

[Means for Solving the Problems]

In the composite writing instrument according to claim 1 of the present invention, the sliding hole of the sheath is formed to have a diameter larger than the maximum outer diameter portion of the refill and smaller than the outer diameter of the elastic body. In the composite writing instrument according to claim 2 of the present invention, the first and second refills are slidably fitted in the sheath, and the guide grooves having a U-shaped cross section for guiding each of the refills in the axial direction are provided. It is provided. In the composite writing instrument according to a third aspect of the present invention, a refill support hole is provided over the entire length of each slider in the axial direction, to which the rear end of each refill is inserted and connected. In the composite writing instrument according to a fourth aspect of the present invention, a claw portion is provided at the front end of each of the sliders so as to protrude toward the elastic body of each system and to suppress the elastic body from the outside during compression.

[Operation]

In the composite writing instrument according to claim 1 of the present invention, the first and second
Can be inserted and inserted from the rear side of the sliding hole of the sheath. In the composite writing instrument according to the second aspect of the present invention, the first and second refills can be smoothly and stably moved in the axial direction by the U-shaped guide grooves of the sheath. In the composite writing instrument according to the third aspect of the present invention, the total length of the refill can be increased without changing the length of the entire writing instrument. In the composite writing instrument according to the fourth aspect of the present invention, the elastic body can be stably held.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view partially showing the internal unit behavior of a composite writing instrument according to an embodiment of the present invention, FIG. 2 is a plan view of a sheath, and FIG. 3 is a sectional view taken along the line III-III of FIG. 4 is a rear view of the slider, FIG. 5 is a cross-sectional view taken along the line VV of FIG. 4, FIG. 6 is a cross-sectional view taken along the line VI-VI of FIG. 4, and FIG. FIG. 23 is an exploded cross-sectional view, in which the same parts as in FIGS. 10 to 23 are denoted by the same reference numerals, and redundant description will be omitted. 1 to 3, in the sheath shaft portion 23 of the sheath 2, guide grooves 23a, 23b having a U-shaped cross section are provided symmetrically, and these guide grooves 23a, 23b are provided in the core pipe 40 of the mechanical pencil shaft 4. And the ballpoint pen shaft 5 are slidably fitted in the axial direction via respective elastic bodies 46 and 52. A sliding hole provided in the front circular step portion 21 of the sheath 2
The diameters of 26 and 27 are large enough to allow the axial movement of the core pipe 40 and the ballpoint pen shaft 5 respectively. More specifically, the diameters of the sliding holes 26 and 27 are formed to be larger than the diameter of the maximum outer diameter portion (the core sending mechanism 42) of the mechanical pencil shaft 4 and the diameter of the ball-point pen shaft 5. The outer diameter of the elastic body 46 and the elastic body of the ballpoint pen shaft 5
The diameter is smaller than 52. Therefore, the mechanical pencil shaft 4 and the ballpoint pen shaft 5
Can be easily inserted into the sliding holes 26 and 27 from their respective rear ends from the rear side thereof, and their assembly can be performed easily and conveniently. As shown in FIGS. 4 to 6, cylindrical refill support holes 6a and 7a are integrally formed on the combined surfaces of the sliders 6 and 7 over the entire length in the axial direction, and these refill support holes are formed. The core pipe 40 and the rear end side of the ballpoint pen shaft 5 are detachably fitted and connected to 6a and 7a from the front end side. In this manner, the core pipe 40 and the rear end side of the ballpoint pen shaft 5 are fitted and connected to the refill support holes 6a, 7a formed in the entire axial length of the sliders 6, 7, thereby reducing the total length of the writing implement itself. The length of the lead pipe 40 and the ballpoint pen shaft 5 can be increased without changing the length of the lead pipe, and accordingly, the lead of the mechanical pencil can be lengthened and the ink storage capacity of the ballpoint pen can be increased. FIGS. 7 and 8 show modifications of the sliders 6 and 7, respectively. In the sliders 6 and 7 of FIG. 7, the refill supporting holes 6a and 7a Slits 6c and 7c of a predetermined length are provided along the axial direction. In the case of the sliders 6 and 7 of this embodiment, the rear ends of the core pipe 40 and the ballpoint pen shaft 5 are press-fitted into the refill supporting holes 6a and 7a so as to be insertable and removable due to the presence of the slits 6c and 7c. I can do it. The sliders 6 and 7 shown in FIG. 8 are configured such that protruding shaft portions 6e and 7e protruding from the rear end inner wall portions into the respective refill support holes 6a and 7a are integrally provided. In the sliders 6 and 7 of this embodiment, the refill support holes 6
When the rear ends of the core pipe 40 and the ballpoint pen shaft 5 are inserted into the rear ends of the core pipe 40 and the ballpoint pen shaft 5, the protruding shaft portions 6e and 7e are press-fit into the respective rear end sides of the core pipe 40 and the ballpoint pen shaft 5 so that they can be inserted and removed. It is supposed to be. Therefore, according to the sliders 6 and 7 in FIGS. 7 and 8, even if there is a molding error in the outer diameter of a refill generally formed of an extruded pipe, the refill can be smoothly moved relative to the refill supporting holes 6a and 7a. The insertion engagement can be reliably held. Further, as shown in FIG. 1, the distal ends of the sliders 6 and 7 protrude forward to restrain the elastic bodies 46 and 52 from the outside at the time of compression, and the elastic bodies 46 and 52 escape radially outward. Claw portions 6b, 7b for preventing deformation are integrally formed. Therefore, each of the elastic members 4 is formed by the claw portions 6b and 7b.
6,52 can be kept stable. Further, as shown in FIG. 9, a clip 9 having a locking piece 9a integrally bent at its rear end is used. It is fitted into a notch hole 3a provided at the end and is elastically engaged. Then, the canopy 8 of the rear outer cylinder 3 was fitted, and an engagement projection 8a provided on the outer periphery of the distal cylindrical portion 36 of the canopy 8 was provided on the rear end side inner wall of the rear outer cylinder 3. By elastically engaging the engaging projections 3b, the clip 9 has a function of preventing the clip 9 from being removed.

【The invention's effect】

As described above, according to the present invention, the first and second refills can be easily assembled to the sheath, and the refills can be smoothly moved back and forth along the sheath. , The total length of each refill can be increased without changing the total length of the writing implement, and
There is an effect that a composite writing instrument which can stably hold an elastic body can be provided.

[Brief description of the drawings]

FIG. 1 is a plan view partially showing an internal unit structure of a composite writing instrument according to an embodiment of the present invention, FIG. 2 is a plan view of a sheath, and FIG. 3 is a sectional view taken along line III-III of FIG. FIG. 4 is a rear view of the slider, FIG. 5 is a cross-sectional view taken along line VV of FIG. 4,
FIG. 6 is a sectional view taken along the line VI-VI of FIG. 4, FIGS. 7 and 8 are sectional views each showing a modification of the slider, FIG. 9 is an exploded sectional view of the rear outer cylinder and the clip, FIG. Is a sectional view showing a conventional composite writing instrument, FIG. 11 is a sectional view taken along the line AA of FIG. 10, FIG. 12 is a sectional view taken along the line BB of FIG. 10, and FIG. FIG. 14 is a plan view, FIG. 14 is a bottom view of FIG. 13, and FIG.
FIG. 13 is a sectional view taken along line CC of FIG. 13, FIG. 16 is a sectional view taken along line DD of FIG. 13, FIG. 17 is a rear view of the conventional slider, and FIG.
FIG. 19 is a sectional view, FIG. 19 is a bottom view of FIG. 17, and FIG.
Is a cross-sectional view of a conventional rear outer cylinder, FIG. 20 (B) is a cross-sectional view taken along line EE of FIG. 20 (A), and FIG. 21 is a partial cross-sectional view of the internal unit structure of the conventional composite writing instrument. FIG. 22 is a plan view, FIG. 22 is an enlarged sectional view of the rear outer cylinder side of the conventional composite writing instrument, and FIG. 23 is a sectional view taken along line YY of FIG. 1 ... front outer cylinder, 2 ... sheath, 3 ... rear outer cylinder, 4,5 ...
Refel, 6,7… Slider, 6a, 7a… Refel support hole, 6b, 7b… Claw, 22… Connecting part, 23a, 23b… Guide groove, 26, 27… Sliding groove, 46 , 52 …… Elastic body.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B43K 24/10-24/18

Claims (3)

(57) [Claims] 1. An outer cylinder, a rear outer cylinder rotatably and detachably connected to a rear end of the front outer cylinder, and a detachably connected to a rear end of the rear outer cylinder, A sheath having a step portion and first and second sliding holes formed in the step portion; and the first sliding hole and the second sliding portion of the sheath slidably back and forth along the sheath. A first refill and a second refill respectively inserted into the holes; a first slider and a second slider respectively connected to a rear end of the first refill and a rear end of the second refill. Respectively attached to the first refill and the second refill, between the shoulder of the sheath and the first slider, between the shoulder of the sheath and the second slider, respectively. A first elastic body and a second elastic member which are disposed to urge the first refill and the second refill, respectively, in a retreating direction; The first and second refills alternately protrude and retract from the front end of the front outer cylinder by rotating the rear outer cylinder relative to the front outer cylinder. In the composite writing instrument, each of the first and second sliding holes of the sheath has a diameter larger than a maximum outer diameter portion of each of the first and second refills, and the first and second elastic members. Are formed with a smaller diameter than the outer diameter of each of the above, and a support hole is formed in each of the first and second sliders extending over the entire length in the axial direction, and a corresponding refill is inserted and connected to the support hole. A composite writing instrument characterized by the following. 2. The sheath has first and second guide grooves extending in the axial direction and having a U-shaped cross section, and the first and second refills are respectively in the first and second guide grooves. The composite writing instrument according to claim 1, wherein the composite writing instrument is slidably fitted in the axial direction. 3. Each of the first and second sliders includes:
3. A claw portion protruding toward the corresponding elastic body at the front end thereof and holding the elastic body from the outside when the elastic body is compressed.
The composite writing implement according to the paragraph.