JPH0565589U - Tentacle extension type mechanical pencil - Google Patents

Abstract

(57) [Summary] [Purpose] It is possible to provide a finger-feeding type mechanical pencil in which all the operations relating to lead-out can be performed by the touch finger at the tip of the shaft, and there is almost no residual lead. [Structure] The balls 15, 15 'and the core fixing chuck 11 are engaged with the inner diameter taper portion 8 of the chuck case 7 by urging them backward by a retracting spring 14.
The relay cylinder 16 connected so as to only interlock with the front is urged forward by the expansion spring 19 set to have a larger elastic force than the retracting spring 14, and the tip spring is attached to the tip so as to restrict the advance in the barrel 1. The mouthpiece 20 engaged with the tip chuck 23 biased rearward by 24 is fixed to the front end of the barrel 1 and penetrates the slot 22 of the mouthpiece 20 and through a slidable piece 26 along the slot 22. The feeding body 2 in which the touching finger portion 27 is exposed to the outside and the holding chuck 29 is attached to the central portion 28
5 is configured so as to interlock with the relay cylinder 16 when retracted and with the tip chuck 23 when advanced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 In the present invention, when the core of the written character is worn out, the necessary amount is added by adding a light operation that gently pulls it with a fingertip and releases it to the feeding part provided at the tip of the shaft while maintaining the writing state. The improvement of the mechanical pencil that extends the toes to enable the centering of the finger.

[0002]

[Prior Art]

 Conventionally, in this type of touch-fing type mechanical pencil, the touch-fing can be fed out only when the lead is gripped by the lead fixing chuck and the holding chuck. In the case where the shaft was refilled into the shaft, the core could not be fed out by using the finger, and it was necessary to press the knock part attached to the rear end of the shaft. Also, when the lead was returned to the shaft at the end of writing, the rear end had to be knocked as well. Furthermore, if the lead is worn out before it can be gripped by the lead fixing chuck, smooth writing cannot be performed and the lead is ejected from the tip of the shaft. Therefore, one lead must always waste a certain length. Had.

[0003]

[Problems to be solved by the device]

 The present invention solves the above-mentioned drawbacks by improving the structure in which the lead gripping of the lead fixing chuck is released except when writing, and eliminates the knocking part at the rear end, and only pulls out the tentacles at the tip of the shaft to store all the lead and store the lead. It is an object of the present invention to provide a simple mechanical stylus type lead-in type mechanical pencil that can be operated and can be used without waste.

[0004]

[Means for Solving the Problems]

 The present invention has been devised in order to achieve the above-mentioned object. The touch-finger-extending mechanical pencil of the present invention is designed such that the core of a chuck case (7) and a ball (15, 15 ') are wedged together. Direction, the retraction spring (14) for urging the lead fixing chuck (11) that strongly holds it toward the rear in the axial direction, and the expansion spring (14) set to have a stronger elastic force than the retraction spring (14). 19) The relay cylinder (16) is urged forward by 19) and the core fixing chuck (11) is installed so that only the front is interlocked with the core fixing chuck (11) to expand the core so that the core can be inserted. At the rear of the limit, the tip chuck (23), which is cast so as to interlock with the feeding body (25) and strongly holds the core toward the rear in the axial direction by the wedge action with the inner diameter of the tip, is provided by the tip spring (24). Provided on the base (20) of the relay cylinder (16) fixed to the front end of the barrel (1) so as to regulate the forward movement of the relay barrel (16) in the barrel (1). Of the feeding body (25) which penetrates the slit (22) and exposes the touching finger (27) to the outside through the piece (26) slidable along the slit (22). A holding chuck (29) for holding the core with a force stronger than the force for pulling the core forward from the core fixing chuck (11) and the tip chuck (23) is attached to the central portion (28) contained in (20), and The core gripping of the tip chuck (23) can be released by pushing the rear end of the tip chuck (23) forward with the tip of the central portion (28) of the feeding body (25).

[0005]

【Example】

 FIG. 1 shows an embodiment of the present invention. First, a chuck case 7 is inserted into the inner diameter portion of the barrel 1 having a rear end to which a tail plug (not shown) is detachably attached, with its rear end abutting the inner diameter step portion 2 of the barrel 1. Immediately after the inner diameter step portion 2, there is a wall portion 4 that divides the inner diameter portion of the shaft cylinder 1 into a chuck case insertion portion and a core storage portion 3, and only one core can pass through the wall portion 4 in the center. A through hole 5 having a diameter is provided, and the back surface has a taper-like taper shape so that the core of the core storage portion 3 can be smoothly guided to the through hole 5.

The chuck case 7 is provided with a taper part 8 in the front inner diameter part, and balls 15, 15 ′ that come into contact with the taper part 8 are fitted in the outer surface recessed parts 12, 12 ′, and a core fixing chuck 11 is installed inside the core fixing chuck 11. The chuck 11 is biased rearward by a retracting spring 14 which is interposed between the chuck 11 and the inner diameter step portion 9 of the chuck case 7.

A rear end outer diameter step portion 17 of the relay cylinder 16 is inserted into a front end inner diameter portion of the chuck case 7. The relay cylinder 16 is biased forward by an expansion spring 19 interposed between the relay cylinder 16 and the front end of the chuck case 7, and the rear end outer diameter step portion 17 of the relay cylinder 16 and the front jaw of the chuck case 7 are urged. It is configured to be prevented from coming off by the portion 10.

The chuck case 7 is provided with one or a plurality of slits (not shown) at the front portion thereof, and the rear end outer diameter step portion 17 of the relay cylinder 16 can be easily inserted and after the insertion. Has a structure that makes it hard to come off.

Here, the front end engaging portion 13 of the lead fixing chuck 11 is connected to the rear end inner diameter jaw portion 18 of the relay cylinder 16 so as to interlock only with the front side, and the pressing force of the expanding spring 19 causes that of the pull-in spring 14. Since the strength is set to be stronger, the rear end outer diameter step portion 17 of the relay cylinder 16 is always pressed forward so as to come into contact with the front end jaw portion 10 of the chuck case 7 when no external force is applied. For this reason, the lead fixing chuck 11 connected to the relay cylinder 16 is also pulled out to the front side and spreads out. Therefore, in this state, the lead can freely pass through the lead fixing chuck 11.

Since the lead fixing chuck 11 and the relay cylinder 16 are connected in the state where the lead fixing chuck 11 is most closed by the retracting spring 14, the front end engaging portion 13 of the lead fixing chuck 11 is connected to the rear cylinder 16 after the relay cylinder 16. The structure is such that it easily engages with the inner diameter jaw 18 and does not easily come off once engaged.

Next, a screw portion 6 is formed on the inner diameter portion of the front end of the shaft cylinder 1, and a cap 20 having a feeding body 25 is screwed thereto. At this time, the rear end of the mouthpiece 20 is dimensioned so as to contact the front end of the relay cylinder 16, and the forward limit of the relay cylinder 16 in the shaft cylinder 1 is defined.

A tip chuck 23 engages with the tip inner diameter portion of the mouthpiece 20, and the tip chuck 23 is biased rearward by a tip spring 24 interposed between the tip chuck 23 and the inner diameter step portion 21 of the mouthpiece 20. .. Further, a center portion 28 of a feeding body 25 fitted around a holding chuck 29 is provided inside the mouthpiece 20, and the feeding body 25 projects a piece portion 26 outward from the center portion 28. A short tubular touch finger portion 27 is formed at the tip (FIG. 2). The piece portion 26 of the feeding body 25 penetrates the slit 22 provided axially from the rear end of the mouthpiece 20 toward the front, and exposes the touching finger portion 27 to the outer peripheral portion of the mouthpiece 20. There is.

The frictional engagement force for holding the core of the holding chuck 29 is set to be stronger than the force for pulling the core forward from the core fixing chuck 11 and the tip chuck 23. For this reason, as another embodiment, if a ball chuck 30 that can pull out the core forward with an extremely small force like the core fixing chuck 11 is used as the tip chuck, it is considerably weaker than the holding chuck 29 of this embodiment. A core holding force can be used. (Fig. 6)

The central portion 28 of the feeding body 25 is arranged between the rear end of the tip chuck 23 and the front end of the relay cylinder 16, and when the feeding body 25 is retracted when the lead is fed, the center of the feeding body 25 is moved. The rear end of the portion 28 comes into contact with the front surface of the relay cylinder 16 and moves back in conjunction therewith. Further, when the feeding body 25 is advanced when the lead is released, the front end of the central portion 28 of the feeding body 25 comes into contact with the rear end of the tip chuck 23 and moves forward in an interlocking manner.

Therefore, the length of the slit 22 of the feeding body 25 is such that the distance from the tip of the slit 22 to the front end of the barrel 1 when the mouthpiece 20 is screwed onto the barrel 1 The dimensions are set such that the plate thickness of the portion 26, the amount of retraction of the feeding body 25 for feeding the lead, and the amount of advance of the feeding body 25 for opening the lead are provided. Further, in the present embodiment, the slot 22 of the mouthpiece 20 and the piece 26 of the feeding body 25 are provided at one place respectively, but they may be provided at a plurality of places without any problem.

[0016]

[Action]

 First, when the touch finger portion 27 is pulled backward with a finger from the state shown in FIG. 1 for feeding the lead, the lead cannot be retracted because it is gripped by the tip chuck 23, and the lead chuck frictionally engages the holding chuck. 29 slides on the core, and the feeding body 25 retracts. At this time, the rear end of the central portion 28 of the feeding body 25 contacts the front end of the relay cylinder 16, the relay cylinder 16 also moves backward against the pressing force of the expansion spring 19, and the lead fixing chuck 11 also retracts the spring 14. It retreats due to the pressing force of. When the feeding body 25 retracts to the α size shown in FIG. 3, the lead fixing chuck is formed by the wedge effect of the taper portion 8 of the chuck case 7 and the balls 15, 15 'fitted in the outer surface recessed portions 12, 12' of the lead fixing chuck 11. 11 tightens and holds the core firmly. Further, by retracting the feeding body 25 to the retreat limit defined by the tip of the barrel 1, the holding chuck 29 frictionally engages the rear side of the core (FIG. 4), and in this state, the touch finger portion 27. If you release your finger from the relay spring 16, the relay cylinder 16 and the interlocking feed-out member 25 move forward by the pressing force of the expansion spring 19 and return to the position shown in FIG. 1. However, since the holding chuck 29 frictionally engages the lead, the lead is pulled out. You can put it out and you can write it down.

The lead fixing chuck 11 and the tip chuck 23 open the lead with a weak force in the forward direction, and hold the lead with a sufficient force against the writing pressure in the backward direction. Further, the holding chuck 29 is set to have a frictional engagement force stronger than the force with which the core fixing chuck 11 and the tip chuck 23 open the core in the forward direction.

Further, as the core is consumed, a new core is fed from the core storage section 3 into the core fixing chuck 11, so that the new core advances by the amount of the core consumed and finally the tip chuck. The core that has been consumed until it cannot be gripped by 23 is discharged from the tip chuck 23, and writing with a new core becomes possible. Similarly, even when there is no core in the shaft and a new core is replenished, the tip of the core falls directly to the position where it comes into contact with the holding chuck 29, so the tip of the core is removed by the first feeding operation. The holding chuck 29 is frictionally engaged, and the feeding operation thereafter causes the lead to be drawn as described above, and finally the writing state is set.

Further, when the lead is accidentally pushed out of the tip chuck 23 more than necessary, or when the lead is returned to the shaft for carrying, the touching finger portion 27 is applied to the pressing force of the tip spring 24. When it is moved forward, the tip of the central portion 28 of the feeding body 25 comes into contact with the rear end of the tip chuck 23 and advances in conjunction with the tip chuck 23, so that the tip chuck 23 expands to open the core (Fig. 5). At this time, since the forward movement of the relay cylinder 16 is regulated by the rear end of the mouthpiece 20, the relay cylinder 16 does not interlock with the feeding body 25 and keeps the lead fixing chuck 11 in an open state, so that the lead is easily pushed back into the tip chuck 23. be able to.

[0020]

[Effect of the device]

 The structure and operation of the touch-finger-feeding type mechanical pencil of the present invention are as described above. Therefore, when the lead is worn out during writing, the required amount of lead can be fed out by lightly operating the touching finger of the feed-out body. It is possible to perform continuous feeding of the second and subsequent wicks, wick feeding when a new wick is replenished, or operation of returning the wick protruding from the tip chuck, all with the fingertips of the tip of the shaft. Since it has been improved, it is not necessary to change the shaft during operation, and the light force of the fingertip is sufficient for the operation. Furthermore, since the tip chuck is provided at the tip of the shaft, the core fixed chuck will be worn out due to wear of the core. It is possible to provide a simple and more economical mechanical pencil that can shorten the length of the core that becomes useless due to being detached and can extend the effective writing distance per core.

[Brief description of drawings]

FIG. 1 shows a partially enlarged view of a vertical cross-sectional view of a finger-feeding type mechanical pencil according to an embodiment of the present invention.

FIG. 2 shows a perspective view of a mouthpiece and a payout body of a touch-finger-drawing type mechanical pencil according to the present invention.

FIG. 3 is a partially enlarged view of a vertical cross-section during the lead-out operation of the touch-finger-drawing type mechanical pencil according to the embodiment of the present invention.

FIG. 4 is a partially enlarged view of a vertical cross section of the touch-finger-feeding type mechanical pencil according to the embodiment of the present invention when the feed-back body is last retracted.

FIG. 5 is a partially enlarged view of a vertical cross section of the touch-finger drawing-out type mechanical pencil according to the embodiment of the present invention at the time of core returning operation.

FIG. 6 is a partially enlarged view of a vertical cross section of a finger-feeding type mechanical pencil according to another embodiment of the present invention.

[Explanation of symbols]

 1 shaft cylinder 2 inner diameter step part of 3 shaft cylinder 3 core storage part of 4 shaft cylinder 4 wall part of shaft cylinder 5 through hole of shaft cylinder 6 screw part of shaft cylinder 7 chuck case 8 taper part of chuck case 9 chuck inner diameter step Part 10 Front jaw of chuck case 11 Core fixing chuck 12, 12 'Outer surface recess of core fixing chuck 13 Engagement part of core fixing chuck 14 Retracting spring 15, 15' Ball 16 Relay tube 17 Relay tube outer diameter step Part 18 Rear end inner diameter jaw part 19 Expansion spring 20 Mouth cap 21 Inner diameter step part of base 22 Slit split 23 Tip chuck 24 Tip spring 25 Feeding body 26 Part of feeding body 27 Feeding body touching portion 28 Feeding body Center part 29 holding chuck 30 tip ball chuck 31, 31 'ball

Claims (1)

[Scope of utility model registration request] 1. A structure in which a core fixing chuck is tightened with a ball has a sufficient core holding force for writing.
In a mechanical pencil that requires only a small force to pull the lead out of the chuck, the lead is axially moved by the wedge action of the taper portion (8) of the chuck case (7) and the balls (15, 15 '). The retracting spring (14) for urging the lead fixing chuck (11) that strongly holds it toward the rear side in the axial direction, and the expansion spring (1) set to a resilient force stronger than that of the retracting spring (14).
9) is urged forward by the core fixing chuck (1)
The relay cylinder (1) in which the core (1) is installed so as to be interlocked only with the front side and the core fixing chuck (11) is opened so that the core can be inserted.
6) is arranged so as to interlock with the feeding body (25) behind the forward limit, and the tip chuck (23) that strongly holds the core toward the rear in the axial direction by the wedge action with the tip inner diameter portion is provided with the tip spring (23). 24) is fixed to the front end of the barrel (1) so as to restrict the forward movement of the relay barrel (16) in the barrel (1) by urging the barrel (20) axially rearward. The feeding body (20), which penetrates the slit (22) and is exposed to the outside through the piece (26) slidable along the slit (22) ( A holding chuck (29) for holding the core with a force stronger than the force of pulling the core forward from the core fixing chuck (11) and the tip chuck (23) in the central portion (28) contained in the die (20) of 25).
A touch finger which is configured so that the core grip of the tip chuck (23) can be released by pushing the rear end of the tip chuck (23) forward with the tip of the central portion (28) of the feeding body (25). Feed-out type mechanical pencil.