JPH0621751Y2 - Knock-type mechanical pencil unit retracting mechanism for writing instruments - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a writing instrument in which a knock type mechanical pencil unit is projected by pressing a knob protruding from the rear end of a shaft, and the knob is appropriately retracted from the pressed state. The present invention relates to a knock-type mechanical pencil unit projecting / retracting mechanism of a writing instrument that allows a knocking operation for centering.

[Conventional technology]

As described in Japanese Utility Model Laid-Open No. 55-47362, as a writing unit retracting mechanism for a writing instrument in which a knock-type mechanical pencil unit is retracted by pressing a conventional knob, a protruding pin of There is known a writing unit retracting mechanism in which the periphery and the head engage with the through hole and the return button, respectively, and when not in use, the return button is pressed to release the engagement of the protruding pin.

[Problems to be solved by the invention]

This is because the slider in which the protruding pin is buried at a right angle to the moving direction works in conjunction with the knob, so when the knock type mechanical pencil unit is built-in, the amount of movement to push in to protrude the knock type mechanical pencil unit, With the knock type mechanical pencil unit protruding from the tip of the shaft, it was necessary to move the knob further in order to push it further. Therefore, when the knob is retracted when carrying it, the amount of knock that extends the core is added to the amount of movement of the knock-type mechanical pencil, so the amount of protrusion of the knob becomes extremely long, so hold the shaft and press the knob with your thumb. When I tried to do so, I had to spread my fingers to push in the knob and it was very difficult to press the knob, and there was a drawback that the appearance of the knob was extremely impaired due to the long protrusion of the knob when carrying it. .

[Means for solving problems]

According to the present invention, a sliding member is slidably mounted in a longitudinal direction in a shaft cylinder, and a locking member is attached to the sliding member integrally or separately, and the locking member is a spring of the locking member itself. Or a locking spring provided separately, urges it at right angles to the longitudinal direction and outward from the center. Further, an inner shaft is provided on the outer side of the sliding tool so as to be slidable in the longitudinal direction, and a protrusion of the locking tool is inserted into a through groove extending in the longitudinal direction of the inner shaft. In a normal portable state, the slide spring is urged rearward in the longitudinal direction by the return spring to bring it into contact with the inner shaft. At this time, the inner shaft is locked to the inner stage of the shaft cylinder, and the knob provided on the inner shaft appropriately protrudes from the rear end of the shaft cylinder. The inner shaft is urged rearward in the longitudinal direction by the rear spring alone. A through hole is formed on a side portion of the shaft cylinder at a position that is appropriately located in front of the locking device in the longitudinal direction and is engageable with a protrusion of the locking device. Moreover, when the locking tool is locked in the through hole of the barrel and the inner spring is appropriately moved rearward in the longitudinal direction by the rear spring, the locking tool is further moved outward in the lateral direction of the barrel, so that the locking member is engaged. The joint portion constitutes a lock mechanism that engages with the engagement hole of the inner shaft.

The engaging portion of the locking tool may be engaged with the engaging groove of the inner shaft or the through groove of the inner shaft to configure the lock mechanism.

[Action]

In the knock type mechanical pencil unit retracting mechanism of the writing instrument of the present invention described above, the inner shaft and the locking tool are moved forward in the longitudinal direction by first pushing the knob. Then, the projection of the locking tool, which is perpendicular to the longitudinal direction and biased outward from the center of the barrel, is aligned with the through hole of the barrel, and the locking tool moves slightly outward. As a result, the protrusion of the locking tool engages with the through hole of the barrel. However, when the engaging portion of the locking tool comes into contact with the inner surface of the inner shaft, the outward movement of the locking tool is stopped. At this time, the tip of the knock type mechanical pencil unit pushed by the sliding tool appropriately protrudes from the tip opening hole of the barrel. Then, when the pressing of the knob is released, the inner shaft is retracted by being biased by the rear spring. However, the sliding tool biased rearward by the return spring is stopped because the projection of the locking tool is engaged with the through hole of the barrel. When the inner shaft is appropriately retracted (moved rearward in the longitudinal direction), the projection of the locking tool comes into contact with the front end edge of the through groove of the inner shaft to stop the inner shaft. Then, since the engaging hole provided in the front portion of the through groove of the inner shaft is formed to have a large width, the engaging portion of the locking tool is engaged with the engaging hole to be in a writing state. When writing in this writing state and feeding out the worn core, pressing the knob again advances the locking tool engaged in the engaging hole of the inner shaft in the longitudinal direction, and slides the locking tool built-in. The mover is advanced to advance the knock type mechanical pencil unit. Therefore, similar to a writing instrument that retracts a conventional knock-type mechanical pencil unit, the mouthpiece step of the knock-type mechanical pencil unit comes into contact with the inner end of the barrel, and the chuck advances in the mouthpiece to extend the core by a fixed amount. Be done.

〔Example〕

The present invention will be described with reference to the drawings.
A metal ring 2 is detachably connected to the front shaft 1 and a rear shaft 3 is attached to the metal ring 2.
Is fixed. In the front shaft 1, a knock type mechanical pencil unit which has been conventionally used is slidably mounted in the longitudinal direction. A center shaft 5 is detachably connected to a connector 4 which is a part of the knock type mechanical pencil unit, and several spare cores are housed in the center shaft 5. A sliding tool 6 is fixed to the rear portion of the center shaft 5, and a locking tool 7 is attached to a fixing hole 6A formed in the sliding tool 6 at a right angle to the longitudinal direction.
Is inserted from the bottom, and a locking spring 8 is stretched between a hole 7A dug from the bottom surface of the locking tool 7 and the bottom surface of the fixing hole 6A of the sliding tool 6. Therefore, the locking tool 7 is urged toward the outside of the rear shaft 3 at right angles to the longitudinal direction. As shown in FIG. 2, the inner hole 3A of the rear shaft 3 is formed in a shape in which a part of a circular cross section is cut out, and the cross-sectional outer diameter shape of the inner shaft 9 corresponds to the inner hole 3A of the rear shaft 3. Since the inner shaft 9 is formed in a substantially matched shape, the inner shaft 9 loosely fitted in the rear shaft 3 slides in the longitudinal direction but cannot rotate in the circumferential direction. The front portion 9A of the inner shaft 9 covers the outside of the sliding tool 6, but the sliding tool 6 and the inner shaft 9 are configured to be slidable in the longitudinal direction independently. As shown in FIG. 3, the head portion of the locking tool 7 described above is formed with a projection 7B which is notched on both sides and has a narrow width, while the front portion 9 of the inner shaft 9 is formed.
As shown in FIG. 4, a through groove 9B slightly wider than the protrusion 7B of the locking tool 7 and narrower than the engaging portion 7C of the locking tool 7 is formed in A by extending in the longitudinal direction. An engaging hole 9C that substantially matches the cross-sectional shape of the engaging portion 7C of the locking tool 7 is formed in the front portion of the through groove 9B continuously with the through groove 9B. The protrusion 7B of the locking tool 7 is inserted through the through groove 9B of the inner shaft 9,
The elastic force of the locking spring 8 makes contact with the inner hole 3A of the rear shaft 3. Therefore, the protrusion 7 is formed by the through groove 9B of the inner shaft 9.
Since B is restricted, the lock 7 cannot rotate in the inner shaft 9 in the circumferential direction. A through hole 3B is formed on the extension line in the longitudinal direction front of the inner hole 3A of the rear shaft 3 with which the projection 7B of the locking member 7 abuts, and further, the rear shaft 3 and the inner shaft 9 and the inner shaft 9 are locked. Since each of the tools 7 is configured so as not to rotate in the circumferential direction, the locking tool 7 does not disagree with the through hole 3B of the rear shaft 3 even if it slides in the rear shaft 3 in the longitudinal direction. Move on a straight line. Further, a return spring 10 is stretched between the metal ring 2 and the sliding tool 6 and
A rear spring 11 having an elastic force weaker than that of the return spring 10 is stretched between the rear end 6B of the inner shaft 9 and the rear end 6B of the inner shaft 9, and the rear end 6B of the sliding tool 6 is locked at the step of the inner shaft 9. 9E, the outer shaft 9F of the inner shaft 9 is brought into contact with the rear shaft 3C of the rear end 3C.
Is abutted against. An eraser 12 is provided on the rear portion of the inner shaft 9, and a knob 13 detachably attached to the inner shaft 9 so as to cover the eraser 12 projects from the rear end 3D of the rear shaft 3 by an appropriate amount.

When writing from the portable state of FIG. 1 described above,
Return spring 10 by pushing knob 13
The inner shaft 9 and the sliding tool 6 are moved forward in the longitudinal direction against the elastic force of. Therefore, the knock type mechanical pencil unit fixed to the sliding tool 6 advances by a certain amount, and the mouthpiece 14 which is a part of the knock type mechanical pencil unit appropriately protrudes from the front end opening hole 1A of the front shaft 1. And the protrusion 7 of the locking tool 7
B is aligned with the through hole 3B of the rear shaft 3 and is biased by the locking spring 8 so that the protrusion 7B of the locking tool 7 appropriately enters into the through hole 3B of the rear shaft 3. However, when the upper stage 7D of the engaging portion of the locking tool 7 comes into contact with the inner surface of the edge of the through groove 9B of the inner shaft 9, the outward movement of the locking tool 7 is restricted to the state shown in FIG. . When the pressing of the knob 13 is released in this state, the inner shaft 9 is retracted by the elastic force of the rear spring 11, and when the inner shaft 9 is retracted in the longitudinal direction as appropriate, the front edge of the engagement hole 9C of the inner shaft 9 is a locking tool. The front end of the protrusion 7 </ b> B of 7 is brought into contact with the inner shaft 9 to stop the backward movement. Then, as shown in FIG. 6, the engaging portion 7 of the locking tool 7
C is aligned with the engaging hole 9C of the inner shaft 9, the locking tool 7 moves to the outside of the side surface 3E of the rear shaft 3 by the elastic force of the locking spring 8, and the engaging portion 7C of the locking tool 7 moves. It fits in the engagement hole 9C of the inner shaft 9 and the projection 7B of the locking tool 7 is formed in the through hole 3 of the rear shaft 3.
As shown in FIG. 7, B is inserted and protrudes slightly outward from the side surface 3E of the rear shaft 3 and the upper step 7D of the engaging portion of the locking member 7 is brought into contact with the inner surface of the edge of the through hole 3B of the rear shaft 3. It will be in a state of being. Therefore, the locking tool 7 and the inner shaft 9 are locked, and the sliding tool 6 and the inner shaft 9 are connected to each other so that they cannot slide in the longitudinal direction. At this time, the eraser 12 and the knob 13 attached to the inner shaft 9 are appropriately projected from the rear end 3D of the rear shaft 3 to be in the writing state shown in FIG. If writing is performed in this state, the projection 7B of the locking tool 7 provided on the sliding tool 6 is in contact with the rear edge of the through hole 3B of the rear shaft 3, so that the knock type mechanical pencil unit is It is supported by No. 6 and you can write without moving backward. When the core is shortened, when the knob 13 is pressed, the inner shaft 9 and the sliding tool 6 are locked by the locking tool 7, so that they move together in the longitudinal direction forward, and the locking tool 7 moves. The protrusion 7B also moves in the through hole 3B of the rear shaft 3. Then the base 1
The stepped portion 14A of No. 4 stops contacting with the inner stepped portion 1B of the front end portion of the front shaft 1, but by further pressing the knob 13, the center shaft 5 advances, and chucks, fasteners, etc., similar to the conventional knock type mechanical pencil unit. The lead-out mechanism (not shown) moves forward and causes the lead to protrude from the tip of the base 14. In addition, when supplementing the spare core into the center shaft 5, the front shaft 1
The core can be replenished inside the center shaft 5 by removing the knock type mechanical pencil unit from the center shaft 5. On the other hand, even when the eraser 12 is used, if the knob 13 is removed, the eraser 12 is sufficiently projected from the rear end 3D of the rear shaft 3 and the inner shaft 9 is locked by the sliding tool 6 and the locking tool 7. Therefore, even if the eraser 12 is pressed against the paper surface, the eraser 1
2 can be reliably used without being immersed in the rear shaft 3. Next, when writing is finished, the protrusion 7 of the locking tool 7 is pushed by pushing in the locking tool 7 protruding from the through hole 3B of the rear shaft 3.
B is disengaged from the through hole 3B of the rear shaft 3 and the engaging portion 7C of the locking tool 7 is disengaged from the engaging hole 9C of the inner shaft 9, and the inner shaft 9 is moved rearward in the longitudinal direction by the elastic force of the rear spring 11. As a result, the outer step 9F is brought into contact with the rear inner step 3C of the rear shaft 3, and the sliding tool 6 and the locking tool 7 are also attached to the return spring 10.
The rear end 6B of the sliding tool 6 is brought into contact with the locking step 9E of the inner shaft 9 by being moved rearward in the longitudinal direction by the elastic force of. At this time, since the moving distance of the inner shaft 9 is shorter than that of the sliding tool 6, the inner shaft 9 is stopped first, and then the sliding tool 6 is brought into contact with the inner shaft 9 and stopped, so that the portable state shown in FIG. Although it returns, the sliding tool 6 receives the cushion by the rear spring 11 and is gently abutted on the inner shaft 9, so that there is no possibility of damaging the spare core in the inner shaft 9.

In the above-mentioned embodiment, the rear spring is stretched between the rear end of the sliding member and the inner stage of the inner shaft. However, as shown in FIG. 9, the rear spring 111 is connected to the rear end 2A of the metal ring 2. There is no problem if it is stretched between the inner shaft 109 and the front end 109F, and in the case of this embodiment, the rear spring 111 does not necessarily need to be set weaker than the return spring 10.

As shown in FIG. 10, the structure of the locking tool is such that a locking tool 107 having elasticity with a C-shaped cross section is fitted into the groove 106C of the sliding tool 106, and the locking tool 107 is An engaging portion 107C that is raised at one end of a C-shaped cross section is formed, and the engaging portion 1
A protrusion 107B that further protrudes from 07C and is narrower than the engaging portion 107C, or as shown in FIG. 11, integrally forms a locking tool 207 made of an elastic piece on a part of the sliding tool 206, The engaging member 207 is formed with a raised engaging portion 207C, which further protrudes from the engaging portion 207C and which engages with the engaging portion 20.
It is sufficiently conceivable to form the protrusion 207B having a width narrower than 7C.

Further, as shown in FIG. 12, the sliding tool 306 provided with the locking tool 107 is formed integrally with the rear portion of the center shaft 105, and the inner hole 105A of the center shaft 105 is opened to the rear end. The rear portion 105B of the inner shaft 105 is inserted into the inner hole 9G of the inner shaft 9 and penetrates from the inner hole 105A of the inner shaft 105 to the rear end opening hole 9H of the inner shaft 9. In the case of this embodiment If the knob 13 and the eraser 12 are removed, a spare core can be replenished into the center shaft 105 from the rear end opening hole 9H of the inner shaft 9.

FIG. 13, FIG. 14 and FIG. 15 show another embodiment of the present invention, in which a fixing hole 406A is formed in the sliding tool 406 at right angles to the longitudinal direction, and the fixing hole 406A is formed.
Windows 406E penetrating at right angles to the longitudinal direction are formed on both side surfaces. The locking tool 307 shown in FIG. 16 is inserted into the fixing hole 406A of the sliding tool 406 from the bottom surface, and the hole portion 307A dug from the bottom surface of the locking tool 307 and the fixing hole 406A bottom surface of the sliding tool 406. A locking spring 8 is stretched between and. Further, engaging portions 307 protruding from both sides of the locking tool 307
C is loosely fitted in the window 406E of the sliding tool 406. Inner shaft 20
9 has a front portion 209A having a through groove 209B extending in the longitudinal direction.
And the front portion 209A of the inner shaft 209 forms the sliding tool 406.
The projection 307B of the locking member 307, which is covered with the through hole 209B of the inner shaft 209, is brought into contact with the inner hole 3A of the rear shaft 3. On the other hand, the engaging portion 307C of the locking tool 307 is inserted into the sliding groove 209I extending in the longitudinal direction of the inner shaft 209 through the window 406E of the sliding tool 406 with an appropriate gap. An engaging groove 209 which is continuous with the sliding groove 209I in the longitudinal direction of the sliding groove 209I of the inner shaft 209 and which extends from the sliding groove 209I to the through groove 209B side as appropriate.
J is formed. Further, the return spring 10 is stretched between the metal ring 2 fixed to the rear shaft 3 and the sliding tool 406, and the rear end 406B of the sliding tool 406 and the inner shaft 209 are stretched.
The rear spring 11 having a resilient force weaker than that of the return spring 10 is stretched between the inner step 209D and the inner step 209D, and the projection 307B of the locking tool 307 abuts on the extension line in the longitudinal direction of the inner hole 3A of the rear shaft 3. Through hole 3B. Further, similarly to the above-described embodiment, the rear shaft 3 and the inner shaft 209, and the inner shaft 209 and the locking member 307 are configured such that they cannot rotate in the circumferential direction and can slide independently in the longitudinal direction. ing.

Next, the operation of this embodiment will be described. When the knob 13 is pushed in for writing from the portable state of FIG. 12, the inner shaft 209 and the sliding tool 406 are longitudinally moved against the elastic force of the return spring 10. To move forward. And knock type mechanical pencil unit / sliding tool 406 and inner shaft 209
When it moves forward by a certain amount, the projection 307B of the locking tool 307 is aligned with the through hole 3B of the rear shaft 3 and is biased by the locking spring 8 so that the projection 307B of the locking tool 307 is appropriately moved through the through hole 3B of the rear shaft 3. Get inside. However, when the upper engaging portion 307D of the locking tool 307 comes into contact with the edge 209K on the through groove 209B side of the sliding groove 209I of the inner shaft 209, the locking tool 30
The movement of No. 7 is restricted to the state shown in FIG. 17, FIG. 18 and FIG. When the pressing of the knob 13 is released in this state, the inner shaft 209 is retracted in the longitudinal direction by the elastic force of the rear spring 11, and the engaging portion 307C of the locking tool 307 causes the front edge of the engaging groove 209J of the inner shaft 209. Is contacted with the inner shaft 2
09 and the backward movement of the knob 13 are stopped. Then, the engaging portion 307C of the locking tool 307 is disengaged from the sliding groove 209I, so that the locking tool 307 urged by the elastic force of the locking spring 8 moves to the outside of the side surface 3E of the rear shaft 3 and locks. Ingredient 307
The engaging portion 307C of is fitted into the engaging groove 209J of the inner shaft 209, and the projection 307B of the locking tool 307 is inserted through the through hole 3B of the rear shaft 3 and slightly outward from the side surface 3E of the rear shaft 3. Project to. As a result, the sliding tool 406 and the inner shaft 209
Is locked by a locking tool 307, and is shown in FIGS.
The writing state shown in FIGS. In this state, when the knob 13 is pressed to extend the core, the inner shaft 209
The sliding tool 406 moves forward in the longitudinal direction in conjunction with, and the lead is fed out in the same manner as the embodiment of FIG. 1 described above.

FIG. 23 also shows another embodiment of the present invention, in which a locking member 407 having a C-shaped cross section and having elasticity is fitted on the groove 106C of the sliding member 106. As shown in FIG. 24, the engaging member 407 has an engaging portion 407C extending in the longitudinal direction and protruding at one end of a C-shaped cross section, and the engaging portion 407C is provided at a position forward of the engaging portion 407C in the longitudinal direction. Further bulge to form a protrusion 407B. On the other hand, in the front portion 309A of the inner shaft 309, a through groove 309B slightly wider than the engaging portion 407C of the locking tool 407 is formed by appropriately extending in the longitudinal direction. The above-mentioned sliding tool 106 is built in the front part of the inner shaft 309 so as to be slidable in the longitudinal direction, and the projection 407B of the locking tool 407 is inserted into the through groove 309B to engage with the inner hole 3A of the rear shaft 3. The stopper 407 itself is brought into contact with the elastic force. Further, the through hole 3B of the rear shaft 3, the return spring 10 and the rear spring 11 are constructed in the same manner as in the above-mentioned embodiment.

Next, the operation of this embodiment will be described. When the knob 13 is pushed in from the portable state shown in FIG. 23, the inner shaft 309 and the sliding tool 106 advance in the longitudinal direction, and the protrusion 407B of the locking tool 407 causes the rear shaft 3 to move. 25 is inserted into the through hole 3B by the elasticity of the locking tool 407 itself, and the upper step 407D of the engaging portion of the locking tool 407 is brought into contact with the front inner surface 309L of the inner shaft 309 to bring about the state shown in FIG. Next, when the pressing of the knob 13 is released, the inner shaft 309 is moved rearward in the longitudinal direction by the elastic force of the rear spring 11. Then, when the inner shaft 309 retreats as appropriate, the front end of the protrusion 407B of the locking tool 407 causes the inner groove 309 of the inner shaft 309 to pass through.
9B is brought into contact with the front edge, the inner shaft 309 is stopped, and the fastener 4
The engaging portion 407C of No. 07 is fitted into the through groove 309B of the inner shaft 309 by the elasticity of the locking tool 407 itself, and the sliding tool 106 and the inner shaft 309 are locked by the locking tool 407, as shown in FIG. It becomes a writing state. Therefore, if the knob 13 is pressed in this state, the inner shaft 309 and the sliding tool 1 are similar to the above-described embodiment.
06 is interlocked and moves forward in the longitudinal direction, and the lead is paid out.

In all of the embodiments described above, the locking device is directly pressed to release the locking device from the rear shaft and release the locking mechanism between the sliding tool and the inner shaft by the locking device. As the pressing mechanism, as shown in FIG. 27, the recessed portion 10 in which the fixing portion 15A of the clip 15 is formed on the rear side surface of the rear shaft 103.
The foot 15B of the clip 15 is locked by the ring 16 fixed to the rear shaft 103 while being fitted to the 3F, and the clip 15 is attached, and the pressing piece 17 is placed in the box-shaped portion 15C in which both sides of the clip 15 are bent. When the rear shaft 103 is loosely fitted, the protrusion 17A of the pressing piece 17 is brought into contact with the protrusion 7B of the locking tool 7, and the rear shaft 103
Is pushed up to the outside of the side surface 103E, and the pressing portion 17B of the pressing piece 17 is configured to sufficiently project from the window portion 15D of the clip 15, or is raised on the rear side surface of the rear shaft 203 as shown in FIGS. 28 and 29. To form a fixing portion 203G, and a pressing portion 203J is formed at an appropriate position outside the elastic piece 203H extending from the fixing portion 203G to form a pressing piece portion, and the window of the clip 115 fixed to the fixing portion 203G. A configuration in which the pressing portion 203J is sufficiently projected from the portion 115D may be considered. In these cases, the pressing portion 17B / 20
By pushing in 3J, the protrusion 17A of the pressing piece 17 or the protrusion 203I of the rear shaft 203 is pushed in to release the locking tool from the rear shaft and release the locking mechanism between the sliding tool and the inner shaft by the locking tool.

Further, as in the embodiment shown in FIG. 30, the projection 7B of the locking tool 7 is brought into contact with the receiving portion 215E of the clip 215 provided on the rear shaft 303, and the clip 215 is pressed to push in the locking tool 7. It is also possible.

Further, all of the above-described embodiments have been described with respect to a writing instrument in which a knock type mechanical pencil unit is independently incorporated and is projected by pressing a knob. However, the knock type mechanical pencil unit retracting mechanism of the present invention has at least one knock type mechanical pencil. The present invention can be sufficiently used for a composite writing instrument that has a unit built-in and can write by writing an arbitrary writing unit in and out by pressing a knob. For example, as shown in FIG. 31, a center shaft 205 to which a knock type mechanical pencil unit is detachably connected, and a refill support shaft 19 to which a ball pen refill 18 is detachably connected are installed in a guide groove 102B of a metal ring 102 in a longitudinal direction. Slidably side by side, each writing unit is urged rearward in the longitudinal direction by the coil spring 20, and a pendulum 21 swinging by gravity is provided on the sliding tool 506, and the writing tool is tilted and the knob 13 is pushed in. As a result, the effect of the present invention can be expected sufficiently even if the above-described knock-type mechanical pencil unit retracting mechanism of the present invention is used for the writing instrument that causes the pendulum 21 to project the desired writing unit.

[Effect of device]

In the present invention described above, the sliding tool provided with the locking tool and the inner shaft provided with the knob are individually incorporated in the rear shaft so as to be slidable in the longitudinal direction, and the knock type mechanical pencil unit is projected. In order to lock the locking tool to the rear shaft with the knob pushed in, a locking mechanism that locks the sliding tool and the inner shaft with the locking tool at the position where the inner shaft has moved appropriately rearward in the longitudinal direction The feature is that it is configured.

As a result, the amount of knob protrusion that protrudes from the rear shaft is only the amount that is moved in the longitudinal direction in order to protrude the knock-type mechanical pencil unit, and the knob protrusion is shortened to allow easy push-in operation of the knob and when carrying it. The appearance is improved. Moreover, in the writing state, the knob appropriately protrudes from the rear end of the rear shaft, and in this state, the knocking operation of extending the lead exerts an excellent effect.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a writing instrument of the present invention using a knock-type mechanical pencil unit projecting / retracting mechanism, FIG. 2 is a transverse sectional view showing line AA in FIG. 1, and FIG. Fig. 1 is a perspective view showing the locking tool of Fig. 1, Fig. 4 is a plan view showing the state of the projection of the locking tool of Fig. 1 and the through groove of the inner shaft, and Fig. 5 is the knock type mechanical pencil of Fig. 1. FIG. 6 is a plan view showing the state of the engaging portion of the engaging member and the engaging hole of the inner shaft in the writing state of the embodiment shown in FIG. 1, and FIG. 8 is a transverse sectional view taken along line AA in FIG. 8, FIG. 8 is a longitudinal sectional view showing a writing state of the embodiment in FIG. 1, and FIG.
FIG. 1 is a partial vertical sectional view showing another embodiment of the present invention,
FIG. 0 is a perspective view showing another embodiment of the sliding tool and the locking tool, FIG. 11 is a perspective view showing another embodiment of the locking tool, and FIG. 12 is another embodiment of the present invention. FIG. 13 is a longitudinal sectional view showing an example, and FIG. 13 is a longitudinal sectional view of a main part showing another embodiment of the knock-type mechanical pencil unit retracting mechanism of the writing instrument of the present invention, and FIG. 14 is a line AA of FIG. FIG. 15 is a partial vertical sectional view showing the state of the sliding groove of the inner shaft and the engaging portion of the locking tool in FIG. 13, and FIG.
FIG. 17 is a perspective view showing the locking tool in the figure, FIG. 17 is a longitudinal sectional view of a main part showing a knob pressing state in FIG. 13, and FIG. 18 is A in FIG.
FIG. 19 is a horizontal cross-sectional view showing the line A, FIG. 19 is a partial vertical cross-sectional view showing the state of the sliding groove of the inner shaft and the engaging portion of the locking device in FIG. 17, and FIG. 20 is the embodiment of FIG. 21 is a longitudinal sectional view showing a writing state in FIG. 21, FIG. 21 is a transverse sectional view showing line AA in FIG. 20, and FIG. 22 is a sliding groove of the inner shaft of FIG. 23 is a partial vertical cross-sectional view showing a state, FIG. 23 is a vertical cross-sectional view of a main part showing another embodiment of the present invention, and FIG.
FIG. 25 is a perspective view showing a locking tool in the figure, FIG. 25 is a longitudinal sectional view of main parts showing a state where the knob of the embodiment in FIG. 23 is pressed, and FIG. 26 is a main view showing a writing state of the embodiment in FIG. 27 is a longitudinal sectional view of a main portion showing an embodiment of a side surface for pressing a locking member, and FIG. 29 is a transverse sectional view showing line AA of FIG. 28. FIG. 30 is a front view of a main part showing another embodiment of the device for pressing a locking tool, and FIG. 31 is a knock type mechanical pencil unit retracting mechanism of a writing tool of the present invention, a knock type mechanical pencil unit. FIG. 6 is a vertical cross-sectional view showing an example used in a composite writing instrument having a plurality of writing units including the above. 1 ... Front shaft 3.103.203.303 ... Rear shaft 3A ... Inner hole of rear shaft 3B ... Through hole of rear shaft 3C ... Rear inner step of rear shaft 3D ... Rear end of rear shaft 3E / 103E ... Side surface of rear shaft 3 103 103F ... Recessed portion of rear shaft 103 203G ... Fixed portion of rear shaft 203 203H ... Elastic piece of rear shaft 203 203I ... Projection of rear shaft 203 203J ... Pressed portion of rear shaft 203 6. 106/206/306/406/506 ... Sliding tool 6A / 406A ... Fixing hole of sliding tool 6/406 6B / 406B ... Rear end of sliding tool 6/406 106C ... Recessed groove portion 406E of sliding tool 106 ... Window of sliding tool 406 7.107.207.307.407 ... Locking tool 7A / 307A ... Hole of locking tool 7/307 7B / 107B / 207B / 307B / 407B ... Locking tool 7/107/207・ 307 ・ 407 protrusion 7C ・07C-207C-307C-407C ... fastener 7, the 107-207, 307, 407 engaging section 7D, 307D, 407D ... fastener 7, 307 - 407
Inner part of the engaging part 9 ・ 109 ・ 209 ・ 309 ... Inner shaft 9A ・ 209A ・ 309 ... Inner shaft 9 ・ 209 ・ 309 front part 9B ・ 209B ・ 309B ... Inner shaft 9 ・ 209 ・ 309 through groove 9C ... Engagement hole of shaft 9D / 209D ... Inner shaft 9/209 inner step 9E ... Inner shaft 9 locking step 9F ... Inner shaft 9 outer step 109F ... Inner shaft 109 front end 9G ... Inner shaft 9 inner hole 9H ... Rear end opening hole of inner shaft 209I ... Sliding groove of inner shaft 209 209J ... Engaging groove of inner shaft 209K ... Edge of inner shaft 209 309L ... Front inner surface of inner shaft 309

Claims (3)

[Scope of utility model registration request] 1. A writing instrument that pushes a knob projecting from the rear end of a rear shaft to cause a knock type mechanical pencil unit to project from the front end of the front shaft for writing, and presses the knob again to feed the lead, A sliding tool that is biased rearward in the longitudinal direction by a return spring is built into the rear shaft, and the locking tool is attached by biasing the sliding tool in the direction perpendicular to the longitudinal direction and toward the outer side of the rear shaft. In addition, an inner shaft that is slidable only in the longitudinal direction and that is urged rearward in the longitudinal direction by a rear spring is built in the rear shaft, and a knob that appropriately protrudes from the rear end of the rear shaft is provided at the rear part of the inner shaft. The sliding tool is provided in the front part of the inner shaft so as to be movable in the longitudinal direction, and a through groove extending in the longitudinal direction is formed in the front part of the inner shaft, and the locking tool described above is provided in the through groove. Is longer than the protrusion of the locking tool. Writing in which a through hole is formed on the side surface of the rear shaft on the extension line in the front in the direction, and the projection of the locking tool is locked in the through hole and the knock type mechanical pencil unit protruding from the tip of the front shaft is received by the sliding tool. In this state, the inner shaft is urged by the rear spring to move rearward in the longitudinal direction with respect to the sliding device, and the engaging portion of the locking device engages with the engaging hole of the inner shaft. Knock type mechanical pencil unit retracting mechanism for writing instruments. 2. A writing instrument that pushes a knob projecting from the rear end of the rear shaft to cause the knock type mechanical pencil unit to project from the front end of the front shaft for writing, and presses the knob again to feed the lead. A sliding tool that is biased rearward in the longitudinal direction by a return spring is built into the rear shaft, and the locking tool is attached by biasing the sliding tool in the direction perpendicular to the longitudinal direction and toward the outer side of the rear shaft. In addition, an inner shaft that is slidable only in the longitudinal direction and that is urged rearward in the longitudinal direction by a rear spring is built in the rear shaft, and a knob that appropriately protrudes from the rear end of the rear shaft is provided at the rear part of the inner shaft. The sliding tool is provided in the front part of the inner shaft so as to be movable in the longitudinal direction, and a through groove extending in the longitudinal direction is formed in the front part of the inner shaft, and the locking tool described above is provided in the through groove. Is longer than the protrusion of the locking tool. Writing in which a through hole is formed on the side surface of the rear shaft on the extension line in the front in the direction, and the projection of the locking tool is locked in the through hole and the knock type mechanical pencil unit protruding from the tip of the front shaft is received by the sliding tool. In this state, the inner shaft is biased by the rear spring to move rearward in the longitudinal direction as appropriate with respect to the sliding tool, and the engaging portion of the locking tool engages with the engaging groove of the inner shaft to form a lock mechanism. Knock type mechanical pencil unit retracting mechanism for writing instruments. 3. A writing instrument that pushes a knob projecting from the rear end of a rear shaft to cause the knock type mechanical pencil unit to project from the front end of the front shaft for writing and presses the knob again to draw out the lead, A sliding tool that is biased rearward in the longitudinal direction by a return spring is built into the rear shaft, and the locking tool is attached by biasing the sliding tool in the direction perpendicular to the longitudinal direction and toward the outer side of the rear shaft. In addition, an inner shaft that is slidable only in the longitudinal direction and that is urged rearward in the longitudinal direction by a rear spring is built in the rear shaft, and a knob that appropriately protrudes from the rear end of the rear shaft is provided at the rear part of the inner shaft. The sliding tool is provided in the front part of the inner shaft so as to be movable in the longitudinal direction, and a through groove extending in the longitudinal direction is formed in the front part of the inner shaft, and the locking tool described above is provided in the through groove. Is longer than the protrusion of the locking tool. Writing in which a through hole is formed on the side surface of the rear shaft on the extension line in the front in the direction, and the projection of the locking tool is locked in the through hole and the knock type mechanical pencil unit protruding from the tip of the front shaft is received by the sliding tool. In this state, the inner shaft is biased by the rear spring to move rearward in the longitudinal direction with respect to the sliding tool, and the engaging portion of the locking tool engages the through groove of the inner shaft. Knock type mechanical pencil unit retracting mechanism for writing instruments.