JPH0632089U - Touch-fing type mechanical pencil - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To reduce costs by enabling resin molding of main parts so that deformation does not occur. [Structure] The touch operation body 45 and the feeding device 32, which are integrated in the conventional example, are divided. In order to interlock them, the feeding body 45 is provided with a locking piece 44, and the locking piece 44 is connected to the finger operation body 45 at the window hole 30 provided in the base 24. It suffices to provide only the window hole 30 in the mouthpiece 24, and does not deform so much as inconvenience like the conventional shaft coupling provided with slits. Therefore, most of the main parts including the base 24 can be resin-molded, and it is possible to provide an inexpensive product due to cost reduction. Also, the base 2
The auxiliary chuck 28 is arranged at the tip of No. 4, and the residual core to be discarded is made short to avoid waste.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a touch-finger-type mechanical pencil that allows a lead to be drawn out by operating a fingertip while holding the shaft when the lead is consumed during writing.

[0002]

[Prior art]

Conventionally, there is a finger-feeding type mechanical pencil as disclosed in Japanese Utility Model Publication No. 64-1107. In this conventional example, the center portion of the feeding body equipped with a holding chuck capable of pulling out the lead from the lead fixing chuck is arranged in front of the lead fixing chuck, and the center portion of the feeding body is housed inside the shaft coupling to accommodate the front end. A slit is formed from the edge and exposed to the outside of the shaft joint.A piece that connects the touching finger part of the feeding body and the center of the feeding body is passed through the slit of the shaft coupling, and the part where the slit of the shaft coupling is provided. The structure is such that the base is screwed. In the case of this conventional example, the front end of the shaft joint is easily deformed due to slitting, so that one part of the feeding body cannot move smoothly along the slit or the mouthpiece screwed to the shaft joint is loose. Inconvenience such as coming off easily occurs. Therefore, in practice, because the molding in easily deformation of the shaft coupling such as a resin hinder occur, not a Banara is cry to metal, wood charge fees, there is a problem that the processing cost and the like cost.

[0003]

[Problems to be solved by the device]

 Therefore, an object of the present invention is to provide a finger-feeding type mechanical pencil that can reduce the cost by preventing the troubles as in the conventional example even when the main parts are molded with resin.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the finger-feeding type mechanical pencil of the present invention securely tightens and fixes the lead 22 when the lead 22 is pressed backward by the writing pressure, but when the lead is pulled forward. Is arranged in front of the main chuck 15 and at the tip of the mouthpiece 24 described later to enable it easily, and has a sufficient core fixing force against the writing pressure and the core 22. It is arranged between the main chuck 15 and the auxiliary chuck 28 so that it can move back and forth between the auxiliary chuck 28, which is relatively easy to pass forward, and when retreating, it centrifuges to free the lead, but when moving forward, it seeks. A feeding device 32 provided with a ball 39 for exerting a lead fixing force capable of pushing out the lead from the auxiliary chuck 28 while holding the lead and pulling the lead out of the main chuck 15, and a feeding device 32, and Located on the outer periphery of the device 32, The locking piece 44 of the device 32 is fitted into the mouthpiece 24 having a window hole 30 at a middle position on the side surface, which is movable in the front-rear direction by a required distance, and the outer periphery of the mouthpiece 24. It is provided with a finger operation body 45 which is locked to the locking piece 44 of the feeding device 32 at the position of the window hole 30 and is integrally connected thereto.

[0005]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. First, FIG. 1 shows a state of writing. A core case 2 is housed inside the shaft cylinder 1 so as to be movable back and forth, and an eraser stopper 4 holding an eraser 3 is fitted to a rear end opening of the core case 2 protruding from a rear end opening of the shaft cylinder 1, A knock cover 5 is attached to the outer peripheral portion of the rear end of the core case 2 so as to cover the eraser 3, and the connecting arm portion 7 of the clip 6 integrally formed with the core case 2 is attached to the slit 8 provided on the barrel 1. Have penetrated. Incidentally, the slit 8 is provided with a stepped portion 9 whose rear surface is inclined in a tapered shape, and the connecting arm portion 7 of the clip 6 is prevented from coming off by using this stepped portion 9 as a stopper. The core case 2 is biased rearward by a spring 12 arranged between a flange portion 10 provided on the outer surface and a step portion 11 on the inner surface of the barrel 1. The lead case 2 has a lead guide portion 13 with a reduced outer diameter at the front end, and a recess 14 on the outer surface thereof. A chuck case 16 accommodating the main chuck 15 is disposed in front of the lead case 2 so as to be movable back and forth, and a lead guide portion 13 of the lead case 2 is inserted into a rear end portion of the chuck case 16. A slot 17 is provided at the rear end of the chuck case 16, and a convex portion 18 is provided on the inner surface of the chuck case 16 to lock the convex portion 18 in the concave portion 14 of the core guide portion 13 of the core case 2. The main chuck 15 housed in the chuck case 16 has a ball 20 fitted in a recess 19 provided on the outer surface of the front end core gripping portion 23, and is urged backward by the chuck spring 21 with respect to the chuck case 16. In the main chuck 15, when the gripped core 22 is pressed backward by the writing pressure, the ball 20 shifts toward the center by the taper portion 27 provided on the inner surface of the front end of the chuck case 16, so that the core 22 can be secured. On the other hand, when the force of the chuck spring 21 is set to be weak and the core 22 is pulled forward, it is easily advanced to expand the front end core gripping portion 23 elastically. Release the wick 22.

A base 24 is screwed onto the front end of the barrel 1. The base 24 may be connected to the barrel 1 by press fitting. The base 24 has a small diameter portion 25 at the front end, and a tip 26 is fixed to the front end opening of the small diameter portion 25. A sub-chuck 28 is housed inside the small-diameter portion 25 of the mouthpiece 24 while being biased rearward by a chuck spring 29. This auxiliary chuck 28 can be fixed by the tip 26 to fix the core 22 to the extent that it can sufficiently withstand the writing pressure. However, by setting the force of the chuck spring 29 to be weak, the core 22 will pass forward. Makes it easy to move. The mouthpiece 24 has a window hole 30 formed at an intermediate position behind the small diameter portion 25. An inner cylinder 31 is housed inside the base 24 so as to be movable back and forth. The front end of the chuck case 16 protruding from the front end opening of the shaft cylinder 1 is inserted into the rear end of the inner cylinder 31, and the feeding device 32 is housed in the front end of the inner cylinder 31 so as to be movable back and forth. . The inner cylinder 31 is biased rearward by a spring 35 arranged between the outer surface step portion 33 and the inner surface step portion 34 of the mouthpiece 24, and its rear end edge is in contact with the front end edge of the shaft cylinder 1. The inner cylinder 31 is provided with a slit 36 at a position corresponding to the window hole 30 provided in the base 24. The feeding device 32 accommodated in the inner cylinder 31 includes a cylinder 38 having a tapered portion 37 at the rear end of the inner surface, a ball 39 accommodated in the cylinder 38, a push ring 40, and a spring 41. It is constituted by a retaining ring 42 fixed to the front end of the cylindrical body 38. The push ring 40 is urged rearward by the spring 41 to retract the ball 39, so that the ball 39 is centered by the taper portion 37 to fix the core 22. The reason why the feeding device 32 is configured to use the balls 39 in this way is as follows. That is, the force (150 to 200 g) required to pull out the core 22 from the auxiliary chuck 28 is to some extent compared with the force (1 to 2 kg) that fixes the core 22 when it is pressed backward by the writing pressure. Although it is small, it is 10 to 100 times as large as the force (5 to 10 g) required to pull out the core 22 from the main chuck 15 using the ball 20, so that the feeding device 32 is made of a normal rubber. When the holding chuck of No. 2 is used, the holding force (20 to 50 g) of the lead by the holding chuck cannot obtain a holding force superior to the force of pulling out the lead 22 from the sub chuck 28, so that the lead 22 can be pulled out from the sub chuck 28. Disappear. Therefore, the feeding device 32 using such a ball 39 and having a large core holding force is required. Further, the tubular body 38 of the feeding device 32 has an elastic arm 43 integrally provided on the outer surface thereof, and further has a locking piece 44 provided at the tip of the elastic arm 43, and the elastic arm 43 is provided with the slit 36 of the inner cylinder 31. The locking piece 44 is fitted into the window hole 30 of the mouthpiece 24 through. A finger operation body 45 is arranged on the outer periphery of the base 24 so as to be movable back and forth. The touch operation body 45 has a peripheral groove 46 formed on the outer surface thereof, and a locking hole 47 is provided in the peripheral groove 46 at a position corresponding to the window hole 30 of the mouthpiece 24, and the locking device 47 is provided in the locking hole 47. A locking piece 44 provided on the cylindrical body 38 of 32 is fitted and locked. Therefore, the touch operation body 45 and the feeding device 32 are connected and interlocked. An O-ring 48 is fitted in the circumferential groove 46 of the finger operation body 45, and a conical spring 49 is arranged between the finger operation body 45 and the base 24 to move the finger operation body 45 forward. We are working.

When the tip of the lead 22 is consumed in the writing state shown in FIG. 1, first, the touch finger operating body 45 is moved backward by operating the fingertip as shown in FIG. The O-ring 48 fitted on the touch operation body 45 serves as a slip stopper. When the touching finger operation body 45 retracts, the feeding device 32 also retracts, but at this time, since the core 22 is held by the auxiliary chuck 28, it does not move and the ball 39 in the feeding device 32 moves to the core 22. Sliding against it, it moves to a position behind the core 22. When the finger is released from the touch operation body 45 in the state of FIG. 2, the touch operation body 45 and the feeding device 32 are integrally advanced by the force of the conical spring 49. At this time, the ball 39 of the feeding device 32 fixes the core 22, and the resistance when pulling the core 22 forward from the main chuck 15 and the auxiliary chuck 28 when the core 22 moves forward as described above. Since both resistances are small, the lead 22 is paid out by the forward movement of the payout device 32.

As shown in FIG. 3, the lead 22 can be extended even if the knock cover 5 is normally knocked forward. That is, the lead case 2 advances, the chuck case 16 in which the protrusion 18 is locked in the recess 14 of the lead guide portion 13 of the lead case 2 also moves forward, and the main chuck 15 in the chuck case 16 and the chuck case 16 as well. Advance. At this time, the core 22 is held by the main chuck 15, and the feeding device 32 and the auxiliary chuck 28 both have small resistance to the forward movement of the core 22 as described above. Will be carried to. When the front step portion 50 provided on the outer surface of the chuck case 16 advances until it abuts against the inner surface step portion 51 provided on the inner cylinder 31, when knocking is further continued, the recess of the lead guide portion 13 of the lead case 2 is formed. 14 and the convex portion 18 of the chuck case 16 are disengaged, the lead guide portion 13 slides forward with respect to the chuck case 16, and its front end abuts against the backward movement of the main chuck 15 and presses it. Thereby, the main chuck 15 is advanced with respect to the chuck case 16. Accordingly, the main chuck 15 elastically expands the lead gripping portion 23 to release the lead 22, and completes the feeding of the lead 22. After that, when the knock pressure is released, the chuck case 16 and the core case 2 are retracted by the force of the spring 12 while the core gripping portion 23 of the main chuck 15 is expanded, and the rear side provided on the outer surface of the chuck case 16 is retracted. When the stepped portion 52 of the chuck contacts the front end of the shaft cylinder 1 and the chuck case 16 is prevented from retracting, the lead case 2 retracts with respect to the chuck case 16 and the recess 14 of the lead guide portion 13 again causes the chuck case 16 to move. The main chuck 15 is also retracted by the chuck spring 21 and grips the core 22 again to return to the state of FIG.

After the writing is finished, in order to retract the lead 22 protruding from the auxiliary chuck 28 at the tip, the knock stroke may be further increased from the state shown in FIG. As shown in FIG. 4, a step portion 54 provided on the rear-end large-diameter portion 53 of the main chuck 15 abuts an inner surface step portion 55 of the chuck case 16, and a step portion 50 on the front side of the outer surface of the chuck case 16 is formed. Since the inner cylinder 31 is in contact with the inner surface step 51, the inner cylinder 31 is pushed and moves forward, and the front end protrusion 56 of the inner cylinder 31 comes into contact with the rear end of the auxiliary chuck 28 and presses the auxiliary chuck 28. As a result, the auxiliary chuck 28 is advanced and the lead gripping portion 57 is expanded by projecting it to the front of the tip metal 26. At this time, the lead 22 is fixed by the balls 39 of the feeding device 32, but the lead fixing force of the feeding device 32 against the retraction of the lead 22 is not so strong as the tightening force of the main chuck 15 and the auxiliary chuck 28 to the lead 22. Therefore, the lead 22 can be retracted into the shaft by pressing the tip of the lead 22.

In this embodiment, the shaft cylinder 1, the core case 2, the main chuck 15, the chuck case 16, the inner cylinder 31, the cylinder body 38 of the feeding device 32, the push ring 40, the stop ring 42, and the finger operation body 45. Parts such as the above are made of resin, and further, the base 24 provided with the window hole 30 is not deformed so as to cause inconvenience, so that it can be made of resin.

Since the auxiliary chuck 28 attached to the tip of the mouthpiece 24 has a core fixing force capable of withstanding the writing pressure as described above, the core 22 is worn out and shortened to a length that cannot be grasped by the main chuck 15. However, it is possible to write as long as it is gripped by the auxiliary chuck 28, and it is possible to shorten the residual core to be discarded and eliminate waste.

[0012]

[Action and effect]

 In the above-mentioned conventional example, the shaft joint is easily deformed due to the provision of slits, and problems such as poor sliding of the payout body and loosening of the die are likely to occur, and in order to avoid these inconveniences, In the above, the present invention has to be made of metal, but as described above, the present invention separates the touching finger operating body and the feeding device, which were integrated in the conventional example, and relates to the feeding body in order to interlock them. Since the stop piece is provided and the locking piece is connected to the finger operation body through the window hole provided in the mouthpiece, only the window hole is required in the mouthpiece and the conventional slitting is provided. Like a shaft coupling, it does not deform so much that it causes inconvenience. Therefore, most of the main parts including the base can be resin-molded, and it is possible to provide an inexpensive product by cost reduction. Also, by arranging a sub-chuck at the tip of the base, there is an advantage that the waste core to be discarded can be shortened and waste can be saved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a state of writing.

FIG. 2 is a vertical cross-sectional view showing a state in which a finger operation body is retracted.

FIG. 3 is a vertical cross-sectional view showing a state in which a knock cover is knocked and a lead is drawn out.

FIG. 4 is a vertical cross-sectional view showing a state in which the knock cover is knocked to open the auxiliary chuck at the tip end.

FIG. 5 is a partially cutaway perspective view showing a state in which a delivery body and a touch operation body are disassembled.

[Explanation of symbols]

 1 shaft cylinder 1 2 core case 5 knock cover 12 spring 13 core guide part 14 recessed part 15 main chuck 16 chuck case 18 convex part 20 ball 21 chuck spring 22 core 24 base 26 tip metal 27 taper part 28 auxiliary chuck 29 chuck spring 30 window Hole 31 Inner cylinder 32 Feeding device 35 Spring 36 Slit 37 Tapered portion 38 Cylindrical body 39 Ball 40 Push ring 41 Spring 42 Stop ring 43 Elastic arm portion 44 Locking piece 45 Touch finger operation body 46 Circumferential groove 47 Locking hole 49 Conical shape Spring 56 protrusion

Claims (1)

[Scope of utility model registration request] 1. A main chuck 1 for securely tightening and fixing the lead 22 when the lead 22 is pressed backward by the writing pressure, but easily when the lead is pulled out forward.
5 and the auxiliary chuck 28, which is arranged in front of the main chuck 15 and at the tip of the mouthpiece 24 described later, has a sufficient core fixing force against the writing pressure and relatively easily allows the core 22 to pass forward. It is arranged between the main chuck 15 and the auxiliary chuck 28 so as to be movable back and forth, and when retreating, centrifuges to centrifuge to free the lead, but when advancing, centripes to grip the lead and pull out the lead from the main chuck 15. The feeding device 32 is provided with a ball 39 that exerts a lead fixing force capable of pushing the lead from the auxiliary chuck 28, and is provided with a locking piece 44, and the feeding device 32 is located at the outer peripheral portion of the feeding device 32. A base 24 having a window hole 30 provided at an intermediate position on a side surface, into which a locking piece 44 is fitted and which can be moved by a required distance in the front-rear direction, and an outer peripheral portion of the base 24. Integrated with the locking piece 44 of the feeding device 32 at the position Finger touch feeding formula pencil consisting comprises a Sawayubi operation body 45 to be connected to.