JPS623270Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention selectively uses two writing units that use a click-type mechanical pencil on at least one side, such as a two-color click-type mechanical pencil or a combination of a lock-type mechanical pencil and a ballpoint pen. This invention relates to a writing instrument that can be protruded from a writing position and used for different purposes, making it easier to carry out office work and to carry it around.

Conventionally, in this type of writing instrument, in order to selectively project two writing units to a writing position or to retract both writing units to a storage position, a cam is attached to a guide that guides the sliding pieces of both writing units. The barrel is rotatable, and the cam barrel moves relative to the guide in order to feed out the lead of the writing unit, which is a sharp pencil.

In this way, the cam cylinder can be rotated relative to the guide,
If they are fitted so that they can move in the axial direction, it is necessary to provide an allowance between them. On the other hand, since the two writing units are used selectively, they are tilted within the case, and the sliding piece attached to the rear end of the writing unit moves the cam cylinder in an inclined direction with respect to the axis due to the elasticity of the spring. Press. Therefore, if the allowance is made smaller, the axial center of the cam barrel will be inclined with respect to the axial center of the guide due to the pressing force in the inclination direction, and the end of the cam barrel will be pressed against the guide and will be in a biting state, causing the cam barrel to guide the guide. It may become inoperable when moving forward or backward. In order to prevent this, it is necessary to provide a relatively large allowance between the cam cylinder and the guide to give the cam cylinder a degree of freedom with respect to the guide. However, if the allowance is large in this way, when the sliding piece and the writing unit move forward due to the rotation of the cam cylinder, the cam cylinder shakes, and the cam cylinder and the sliding piece do not slide smoothly, making it difficult to move the writing unit smoothly. It is difficult to operate and the quality is inferior.
Also, as mentioned above, if the cam barrel is moved relative to the guide in order to feed out the lead, it is necessary to leave a margin behind the guide for the moving length (knock stroke) of the cam barrel, which increases the overall length. There were drawbacks such as increased length.

The purpose of this invention is to improve the accuracy of the alignment of the cam cylinder and guide so that the writing unit can operate smoothly, improve quality, and shorten the overall length of the writing instrument. is to provide.

In order to achieve such an object, the present invention includes a case in which a cap is rotatably connected to a tip shaft, and a notch type sharp is provided inside the case so as to be able to reciprocate between a writing position and a storage position. Two writing units using pencils, a sliding piece attached to the rear end of each writing unit approximately 180 degrees apart, and a sliding piece installed in the case so that it can only slide relative to the tip axis, and each writing unit a guide that guides the sliding piece so that it can only slide; a cam cylinder provided so as to be able to move together with the guide when feeding out the lead, and provided with a cam surface for moving the sliding piece forward and backward; a spring that urges the guide backward; each writing unit; It is characterized by having a spring that biases the sliding piece toward the cam surface side of the cam cylinder.

Hereinafter, one embodiment of the present invention will be specifically described based on the drawings. As shown in FIGS. 1 and 2, the case 1 has a tip tapered gradually and includes a tip shaft 3 having an opening 2 at the tip, a cap 5 with a clip 4 on the rear side, a connecting tube 6, and a threaded tube. Consists of 7th grade.
This case 1 has a connecting tube 6 as shown in Fig. 6A and B.
The rear end of the tip shaft 3 is screwed into a threaded portion carved in the middle of the ring, and the ring is interposed between the tip shaft 3 and the annular groove 8 formed on the front side of the threaded portion of the connecting tube 6. A shaped rubber packing 9 is housed therein. A threaded pipe 7 is fitted to the rear side of the connecting cylinder 6, and the front large diameter part and the rear end of the threaded pipe 7 are connected to the collar part 10 provided at the middle part of the connecting cylinder 6 and the rear end of the connecting cylinder 6. It is held between a caulked part 11 and supported so as to be rotatable only. A cap 5 is screwed onto the threaded pipe 7. Therefore, the cap 5 can be rotated with respect to the front shaft 3, and the rubber packing 9 can withstand the rotational torque at this time.

Inside case 1 are two writing units 12 and 13.
is arranged so as to be able to reciprocate between the writing position and the storage position. Both of these writing units 12 and 13 are constructed as knock-type mechanical pencils.
That is, a lead case pipe 15 is slidably fitted inside the rear part of the main body 14, and as the lead case pipe 15 moves forward and backward, a lead feeding mechanism (not shown) such as a chuck and a fastener built into the main body 14 is removed. The main body 14 is configured so that the core 1 can be made to protrude from the base 16 of the main body 14 by advancing the main body 14 and retracting the main body 14.

Core case pipe 15 for writing units 12 and 13
Sliding pieces 17 and 18 are attached to the rear end portions, respectively. The details of these sliding pieces 17 and 18 are particularly
As is clear from Figures A to C, it is formed into a cylindrical shape,
A protrusion 19 that follows a cam surface 38 of a cam cylinder 37, which will be described later, is integrally provided on the outside of the intermediate portion, and a lead insertion hole 20 is formed inside, and the lead l can be easily inserted into the rear end of the lead insertion hole 20. Guide part 2 expanded to
1 is formed. The sliding pieces 17 and 18 are fitted on the outside of the rear end of the lead case pipe 15 of each of the writing units 12 and 13, and the lead insertion hole 20 is communicated with the lead case pipe 15.

A guide 22 is arranged inside the rear part of the case 1. The details of the guide 22 are particularly clear from FIGS. 5A to 5E, in which guide grooves 23 are formed at approximately 180 degrees apart along the axial direction, and a spring receiver that slightly protrudes into the guide grooves 23 at the tip and rear side. 24 and 25 are provided, a collar 26 is provided on the outer periphery of the front side, a fan-shaped protrusion 27 is provided in the circumferential direction on the outer side of the rear side, and protrusions 28 and 29 are provided on the outer side of the tip and the outer side of the rear end, respectively. It is provided. This guide 22 is inserted inside the cap 5 of the case 1, and a washer 30 is interposed between the flange 26 and the inner circumferential step of the cap 5 to restrict the guide 22 from retreating. The rear end of a cylindrical body 31 as shown in FIGS. 7A and 7B is fitted to the tip of the guide 22, and the protrusion 28 and the window 32 formed mutually are fitted.
are engaged and connected together. This cylinder 3
A pair of recesses 33 are provided on the sides of the connecting tube 6, and the recesses 33 are fitted into the recesses 34 provided in the connecting tube 6, as shown in FIG. It is supported so that it can only slide relative to the connecting tube 6 and the tip shaft 3. A washer 35 is interposed between the rear end surface of the cylindrical body 31 and the collar 26 of the guide 22. A compression spring 36 is interposed between the caulking portion 11 of the connecting cylinder 6 and the washer 35, and the guide 22 and the cylinder body 31 are biased rearward.
The sliding pieces 17 and 18 of each of the writing units 12 and 13 are inserted into each guide groove 23 of the guide 22 so that they can only slide, and the driven protrusions 19 of each sliding piece 17 and 18 are spaced approximately 180 degrees apart. It projects outward from the guide groove 23.

A cam cylinder 37 is fitted inside the cap 5 of the case 1 on the outside of the guide 22. Cam tube 3
As is particularly clear from FIGS. 9A to 9C, a cam surface 38 for advancing and retracting the sliding pieces 17 and 18 is formed diagonally on the circumference, and a notch 39 is formed at the top of the cam surface 38. A flat surface 40 is formed at the end of the cam surface 38. A fan-shaped protrusion 41 is provided in the circumferential direction on the inside of the rear part of the cam cylinder 37. A flat surface formed on the rear outer side of the cam cylinder 37 is fitted into a flat surface formed inside the cap 5 (see Fig. 3), and the cam cylinder 37 rotates relative to the cap 5. It is stopped so that it can slide against the cap 5 and allows the guide 22 to rotate. At this time, the guide 22 is
Both end surfaces 27a and 27b of 7 are the protrusions 4 of the cam cylinder 37.
1 (see FIG. 3), and this rotation angle is set to approximately 180 degrees.
The compression spring 42 attached to each writing unit 12, 13 is connected to the spring receiver 24 of the guide 22 and the sliding piece 1.
7, 18, and the elasticity of this compression spring 42 biases the sliding pieces 17, 18 and each writing unit 12, 13 rearward. Guide 2
A cap inner cylinder 43 as shown in FIG. A flange 45 is provided at the tip of the cap inner cylinder 43, and this flange 45 prevents the cam cylinder 37 from moving backward.

The rear end surface of each sliding piece 17, 18 and the guide 2
A coiled compression spring 46 for inserting the core is interposed between the spring receiver 25 of No. 2, and communicates the core insertion hole 20 of the sliding pieces 17, 18 with the rear open portion of the guide groove 23 of the guide 22. There is. This compression spring 46 is set to be weaker than the compression springs 36 and 42. An eraser stopper 48 to which an eraser 47 is attached is removably fitted to the rear side of the inner cylinder 43 of the cap.
A knock cover 49 as shown in FIG. 11 is removably fitted on the outside of the cap inner cylinder 43 inside the cap 5. As shown in FIG.

Next, the mode of use of the present invention will be explained. now,
As shown in FIGS. 1 to 3, the driven protrusion 19 of the sliding piece 17 of one writing unit 12 is engaged with the tip notch 39 of the cam cylinder 37, and the sliding piece 18 of the other writing unit 13 is engaged with the leading end notch 39 of the cam cylinder 37. The driven protrusion 19 is engaged with the flat surface 40 of the cam cylinder 37, and the one end surface 27a of the protrusion 27 of the guide 22 is engaged with the one end surface 41a of the protrusion 41 of the cam cylinder 37, so that writing on the writing unit 12 is performed. It is assumed that the tip is projected from the opening 2 of the tip shaft 3 to the writing position, and the writing unit 13 is retreated to the storage position. From this state, the knob cover 49 is pressed, and the cap inner cylinder 43, cam cylinder 37, guide 22, cylinder body 31, sliding pieces 17, 18, and each writing unit 12, 13 are pressed against the elasticity of the compression springs 42, 36. advance. As the writing unit 12 moves forward, when the rear step 16a of the cap 16 comes into contact with the inner edge of the opening 2 of the case 1, the lead case pipe 15 moves forward as described above, thereby causing the lead feeding mechanism in the main body 14 to move forward. Advance. At this time, since the other writing unit 13 has retreated to the storage position, even if it moves forward, its mouthpiece 16 does not come into contact with the inner edge of the opening 2, so the lead feeding mechanism does not move forward. On the contrary, by releasing the pressing force of the knob cover 40, each writing unit 12, 13 and the sliding piece 1
7, 18, the cylinder 31, the guide 22, the cam cylinder 37, and the cap inner cylinder 43 return to their original positions due to the elasticity of the compression springs 36, 42, and the lead feeding mechanism within the main body 16 of the writing unit 12 also retreats. Therefore, by knocking the knock cover 49, the cap 1 can be opened.
By sequentially protruding the lead 1 from the tip of 6, it is possible to perform tasks such as writing. Furthermore, when the cap 5 and the cam cylinder 37 are forcibly rotated in the clockwise direction in FIG. The driven protrusion 19 on the side of the writing unit 12 follows along one side of the cam surface 38 of the cam barrel 37, and the driven protrusion 19 on the side of the writing unit 13 moves along one side of the cam surface 38 of the cam barrel 37.
along the other side of the cam surface 38. Cam tube 3
7 rotates approximately 180 degrees, and one end surface 41 of the protrusion 41
When b engages with one end surface 27b of the protrusion 27 of the guide 22, the driven protrusion 19 on the writing unit 13 side is engaged with the notch 39 of the cam cylinder 37, and the driven protrusion 19 on the writing unit 12 side is engaged with the notch 39 of the cam cylinder 37. 37, the writing unit 13 advances to the writing position, and the writing unit 12 retreats to the storage position. Therefore, by knocking the knock cover 49 as described above, the lead l can be successively protruded from the mouthpiece 16 of each writing unit 13 to perform writing or other operations. Further, by rotating the cap 5 and the cam cylinder 37 in the opposite direction, that is, counterclockwise in FIG. 3, the writing unit 12 can be advanced to the writing position and the writing unit 13 can be retreated to the storage position. Therefore, two colors or two with different hardness
You can use different types of cores. Also, by removing the knob cover 49, the eraser 47, and the eraser stopper 48 from the cap inner cylinder 43, the core can be removed.
sliding piece 1 through the inside of the coiled spring 46
Each writing unit 1 is inserted through the lead insertion holes 20 of 7 and 18.
It can be replenished into the lead cases 15 of 2 and 13.

In the above embodiment, both writing units 1
Although the writing units 2 and 13 are configured as click-type mechanical pencils, a ballpoint pen or the like may be used for either one of the writing units.In short, a click-type mechanical pencil may be used for at least one of the writing units.

As is clear from the above, according to the present invention, two writing units are selectively projected to the writing position,
Alternatively, in order to retract both writing units to the storage position, the cam cylinder is rotatable relative to the guide that guides the sliding pieces of both writing units, and the lead of the writing unit, which is a sharp pencil, is fed out. In some cases, the cam cylinder and guide are moved together. Therefore, even if the writing unit and the sliding piece at the rear end are urged against the cam cylinder by the elasticity of the spring, and a force in an inclination direction is applied to the cam cylinder and the inner surface of the cam cylinder is pressed against the guide, the cam will not move as described above. There is no need to move the cylinder in the axial direction relative to the guide, and although there is some resistance when rotating the cam cylinder relative to the guide, there is no risk of blocking the rotational operation, so there is almost no play between the two. It is possible to improve the precision of the mind without any problem. This prevents any wobbling when the cam cylinder rotates, and the rotation of the cam cylinder allows the cam cylinder and the sliding piece to slide smoothly when moving the sliding piece and writing unit forward. The unit can operate smoothly and improve quality. In addition, as mentioned above, when the lead is fed out, the cam cylinder and guide are moved together, so there is no need to provide a margin for the movement length of the cam cylinder (knock stroke) behind the guide, so the overall length is It has advantages such as being able to shorten the length.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view showing one embodiment of the writing instrument of the present invention, Fig. 2 is a side view, and Fig. 3 is a - of Fig. 1.
4A is a plan view of the sliding piece used in the present invention, FIG. 4B is a side view, FIG. A plan view of the guide used in Figure B is B of Figure A.
-B cross-sectional view, the same figure C is CC of the same figure A
D is a cross-sectional view taken along line D-D in figure B, figure E is a cross-sectional view taken along line E-E in figure B,
Fig. 6A is a longitudinal sectional view of the connecting tube used in the present invention, Fig. 6B is a sectional view taken along the line B-B of Fig. 7A, and Fig. 7A
is a vertical cross-sectional view of the cylinder fixed to the tip of the guide used in the present invention, Figure B is a cross-sectional view taken along the line B-B in Figure A, and Figure 8 shows the connecting cylinder and cylinder combined,
A cross-sectional view corresponding to the BB arrow view in FIG. 6, No. 9
Figure A is a longitudinal sectional view of the cam cylinder used in this invention, and Figure B
10 is a bottom view, C is a rear view, FIG. 10 is a vertical cross-sectional view of the inner cylinder of the cap used in the present invention, and FIG. 11 is a vertical cross-sectional view of the knob cover used in the present invention. 1... Case, 2... Opening, 3... Tip shaft, 5...
... Cap, 6 ... Connection tube, 7 ... Threaded pipe, 1
2, 13... Writing unit, 17, 18... Sliding piece, 20... Core insertion hole, 22... Guide, 31
... Cylinder body, 37 ... Cam tube, 38 ... Cam surface, 4
3... Cap inner cylinder, 46... Coiled spring for core insertion, 49... Knock cover.

Claims (1)

[Scope of utility model registration request] A case in which a cap is rotatably connected to the tip shaft, and two writing units that are arranged inside the case so as to be able to reciprocate between a writing position and a storage position, and that use a knob-type sharp pencil on at least one of them. , a sliding piece is attached to the rear end of each writing unit approximately 180 degrees apart, and a sliding piece is provided in the case so that it can only slide relative to the tip shaft, and the sliding piece of each writing unit can only slide. a guide that guides the lead, and a guide that is rotatable in the case integrally with the cap and that can only slide relative to the cap, rotatable relative to the guide, and integrally with the guide when feeding out the core. A cam cylinder that is movable and has a cam surface for advancing and retracting the sliding piece, a spring that biases the guide backward, and each writing unit and sliding piece are placed on the cam surface side of the cam cylinder. A writing instrument characterized by having a spring that biases the writing instrument.