JPS635917Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improvement of a sharpening pencil in which lead cores are fed out sequentially as the lead cores are consumed. By pulling out the rear barrel rearward, the lead lead feeding mechanism and the pressing part are engaged, and by pressing the rear barrel, which is the pressing part, the lead stored in the main body is sent out to the tip of the main body, allowing writing. This invention relates to a sharp pencil in which, when not in use, the rear barrel is pulled out rearward again, thereby disabling the pressing operation of the lead lead feed-out pressing section and stopping the supply of lead lead to the tip of the main body.

Conventionally, this type of sharp pencil has been designed such that the rear end of the lead storage cylinder connected to the collection chuck protrudes from the rear end of the main body, or the rear part of the lead storage cylinder is connected to the rear shaft of the main body, and the lead storage cylinder is connected to the collector chuck. The so-called knock-type sharp pencil, which feeds out the lead cores one by one from the lead storage cylinder by directly or indirectly pressing the rear end of the cylinder, as well as spiral grooves and vertical grooves, etc. The so-called rotary feeding type is composed of a lead core holding member having an engaging protrusion, and the lead core holding member is advanced and the lead core is fed out through relative rotation between the spiral groove and the longitudinal groove. Sharp pencils and the like have been proposed.

In the former case, the lead cores stored in the lead core storage cylinder can be fed out sequentially until the last one, but on the other hand, a member for pressing the notch protrudes from the rear end of the shaft,
Or, the outer diameter of the rear shaft and the outer diameter of the front shaft are different due to pressure sliding, or because the pressure is always ready for operation, unintentional pressure may be applied to the pressing part even when not in use. There is a possibility that the lead core may be unwound, which may damage the lead core or stain clothes, etc. To prevent this, some caps are installed on the tip or a sliding cap is installed. Several proposals have been made, but none have led to a fundamental solution.

In the latter case, a knocking member protruding from the rear end of the main body is not necessary, and the front and rear barrels can be made of the same diameter, which creates a design effect. However, when one lead core is worn out, a new lead core must be attached to the lead core holding member from the front of the tip, making the replacement operation extremely cumbersome. Each has its advantages and disadvantages.

The purpose of the present invention was to overcome these conventional drawbacks.According to the present invention, the shaft body can obtain an integrated design effect with no steps, as in the latter case mentioned above, and can be used for writing. Sometimes, as in the former case mentioned above, multiple lead cores stored in the lead core storage cylinder can be fed out one after another until the last one, and furthermore, when not in use, it is useless because the pressing operation for feeding out the lead cores is disabled. This can prevent the lead core from being unnecessarily knocked out and drawn out due to a strong impact or the like. Furthermore, the object is to obtain a sharp pencil that has a length that is convenient for storing in a pocket of clothes when not in use, but has a suitable grip balance when writing because the entire length is extended when in use. Hereinafter, a detailed explanation will be given according to an embodiment shown in the drawings.

Fig. 1 shows the appearance of an embodiment of the present invention when not in use. 1 is a front barrel, 2 is a rear barrel with a clip, and 3 is a tip. The shaft cylinders 2 abut against each other and maintain their positions.

FIG. 2 shows a state in which the rear barrel 2 is pulled out rearward with respect to the front barrel 1 from the state shown in FIG.

At this point, the operating function as a knock-type sharp pencil is added for the first time, and the lead core can be drawn out.

Fig. 3 shows a state in which the rear barrel 2 is pressed against the front barrel 1 from the state shown in Fig. 2, and the lead core feeding mechanism operates and the lead core is fed out to the tip of the tip. It shows.

In Figure 3, when the pressing force of the rear barrel 2 on the front barrel 1 is released, the entire state returns to the state shown in Figure 2, and the lead core exposed from the tip is retained by the internal lead core. Since the position is held by a mechanism, it becomes ready for writing.

FIG. 4 shows the appearance of the rear barrel 2 in the state shown in FIG. 1 or 2, with the lead core storage barrel 4 provided inside the front barrel 1 unscrewed from the screw 4a. It is showing. In the figure, 5 is a joint fixedly attached to the front barrel 1, 4 is a lead storage barrel, and 6 is an eraser body.

Figures 5 to 7 show internal sectional views corresponding to the external views in Figures 1 to 3, respectively, and Figure 8 shows the state shown in Figure 5 with no lead core in its mouth. An internal sectional view is shown, FIG. 9 is an exploded perspective view of the main parts of this embodiment, and FIG. 10 is an external view of another embodiment. Furthermore, FIGS. 11 and 12 are drawings regarding the switching mechanism A.

Next, the internal configuration will be explained.

In FIG. 5, reference numeral 1 denotes a barrel barrel, and inside the tip of the barrel barrel 1 is fixed a center barrel 7 that houses a generally known so-called knock-type lead lead feeding mechanism for a mechanical pencil. That is, a screw 7a is provided on the front outer circumferential surface of the center shaft 7 (hereinafter, the writing side will be referred to as the front and the other side will be referred to as the rear), and the tip 3 is attached to the screw 7a so that it can be removed using the tip surface 1a of the front barrel 1 as a limit. possible to be screwed together.

A compression coil spring 8 is attached to the other inner step 7b of the center shaft 7.
One end of the compression coil spring 8 is in contact, and the other end of the compression coil spring 8 is in elastic contact with the stepped portion 9a of the relay holder 9.
The inner peripheral surface of the circular hole of the center shaft 7 is provided with an inward protrusion 7c for sliding along one or more axes,
1 provided on the front outer peripheral surface of the relay holder 9
The relay holder 9 is engaged with a plurality of connecting sliding grooves 9b so that the relay holder 9 can be moved forward and backward with respect to the center shaft 7, but cannot be rotated. A collect chuck 10 for holding the lead core is fixed on the inside of the tip of the relay holder 9 by fitting or other appropriate method, and the collect chuck 10 is attached to the chuck ring 11 while holding the lead core 18 in its mouth by the elastic force of the compression coil spring 8. Since the rear end 11a of the chuck ring 11 is in contact with the center shaft 7, the relay holder 9 is prevented from moving backward, and the relay holder 9 is held in its position, thereby forming a knock-type lead lead feeding mechanism. Relay holder 9
A cylindrical hole that opens at the rear is drilled to the middle,
A slide cam 12 and a rotary cam 13 are fitted to this to form a switching mechanism A similar to a conventional ratchet type cam mechanism, as shown in FIGS. 11 and 12. This switching mechanism A includes a cam tooth 9c having a slope 9c' at the rear end over the entire inner peripheral surface of the relay holder 9, and a rear engaging portion 9f between the slope 9c' at the rear end of the cam tooth 9c. A deep clearance groove 9d is formed between the cam teeth 9c, and a front engagement part 9e is formed on the inner side.A shallow groove 9g is formed in the rear engagement part 9f, and the shallow groove 9g and the above-mentioned shallow groove 9g are formed. By fitting the protrusion 12e of the slide cam 12 into the gap groove 9d, the vertical groove 12a is fitted into the cam teeth 9c, and the slide cam 12 is slidably inserted into the relay holder 9.
Also, the slope 12 at the tip of the protrusion 12e of the slide cam 12
The rotating cam 13 having a protrusion 13c that engages with the cam teeth 9c and disengages with the cam teeth 9c is attached to the relay holder 9.
Rotatably inserted into. Furthermore, a cam spring 1 which is weaker than the compression coil spring 8 is attached to the rear end of the rotating cam 13.
4 resiliently engages with a spring stopper member 15 fixed inside the rear end of the relay holder 9, thereby urging the slide cam 12 and the rotary cam 13 in the forward direction. A flange-like stepped portion 12c is provided on the inner circumferential surface of the slide cam 12, and the front end portion of the lead core storage tube 4 is attached to the slide cam 12 so that its tip abuts against the flange-like stepped portion 12c of the slide cam 12. It is fixed as one piece. On the other hand, a screw 4a is provided on the outer side of the rear end of the lead core housing cylinder 4, and a rear shaft inner cylinder 16 fixed to the rear shaft cylinder 2 is screwed into the screw 4a. As a result, the tip of the rear barrel 2 is elastically brought into contact with the rear end of the front barrel 1 due to the forward tensile force of the lead core storage barrel 4 which is transmitted by the elastic force of the cam spring 14. There is. In addition, a stopper 17 is provided protruding from the outside of the intermediate portion of the lead core storage tube 4, and the distance in the axial direction between the rear end surface 17a and the front end surface 5a of the joint 5 fixed inside the rear end of the tip barrel 1 is determined. are fixed or integrally formed to equalize (M+β). M is the rearward axis of the slide cam 12 where the rotary cam 13 is pulled out from the front engagement part 9e of the relay holder 9 through the gap groove 9d rearward and rotated at a certain angle when the collet chuck 10 is holding the lead core in its mouth. β represents the amount of directional movement, and in order to smooth the rotation of the rotary cam 13, the slide cam 12 is further pulled out and moved, and the vertical groove 12a of the slide cam 12 is detached from the cam teeth 9c of the relay holder 9. Amount of movement up until the last minute,
Alternatively, after the rotary cam 13 has rotated to a certain angle, the force that pulls the lead storage tube 4 backwards causes the relay holder 9 via the cam spring 14 to be pulled backwards, and the collector chuck 10 is further tightened. In other words, it represents the amount of movement of the lead core storage cylinder 4 until the cam spring 14 reaches a load just before causing the lead core to break.

In other words, it is provided to enforce a forced restriction in order to prevent the collection chuck 10 from tearing the lead core 18. Similarly, lead core storage cylinder 4
An eraser body 6 is removably fitted inside the rear end portion to prevent the lead core stored in the lead core storage tube 4 from falling off or to correct written characters, etc. In addition, between the front outer circumferential surface 4b of the lead core storage tube 4 (see FIG. 9) and the inner circumferential surface of the rotary cam 13, and between the middle outer circumferential surface of the lead core storage tube 4 and the rear of the relay holder 9. Spring stopper member 1 fixed to the end
5, and between the rear outer peripheral surface of the lead core storage cylinder 4 and the inner peripheral surface of the joint 5 fixed to the inside of the rear end of the lead barrel 1, there is a slidable gap. ing. Further, the rear outer circumferential surface 5b of the joint 5 has a gap with the inner circumferential surface of the rear shaft cylinder 2 such that it can slide and rotate freely. On the other hand, the gap in the axial direction between the inner bottom surface 9d of the relay holder 9 and the front end surface 12d of the slide cam 12 (see FIG. 9C) is the same as when the collector chuck 10 holds a lead core in its mouth and when it does not hold a lead core in its mouth. The numerical value (L + α) is the sum of the minute difference movement distance L of the relay holder 9 in the direction, and the free space α to keep the rear barrel 2 and the front barrel 1 in constant contact as described above.
shall have the following.

Next, the operation of this embodiment will be explained.

In Figures 1, 5, and 8, the rear barrel 2 and the front barrel 1 are in contact with each other, that is, the rear barrel 2 is pressed against the front barrel 1 and the lead core inside is drawn out. Indicates the state in which the mechanism cannot be operated, that is, the state when it is not in use. Continuing the explanation with reference to FIG. 6, when the rear barrel 2 is pulled rearward along the axis with respect to the front barrel 1 from the state shown in FIG. 5, it is fixed to the rear barrel 2. The lead core housing cylinder 4 is pulled through the rear shaft inner cylinder 16, and comes into contact with the slide cam 12 by the elastic force of the cam spring 14 through the slide cam 12 fixed to the tip of the lead core housing cylinder 4. The rotating cam 13 compresses the cam spring 14, and the rotating cam 13
The protrusion 13c is the front engagement portion 9e of the relay holder 9.
It is moved more rearward, and at the same time, it is moved rearward with respect to the front barrel 1. On the other hand, the relay holder 9 includes the collect chuck 10 and the chuck ring 1 as described above.
1 and the compression coil spring 8 prevents the relay holder 9 from moving backward, so the relay holder 9 remains at that position, and the slide cam 12 described above
Only the rotating cam 13 moves rearward along the cam teeth 9c of the relay holder 9, and is elastically locked between the rotating cam 13 and the rotating cam 13 by a spring stopper 15 fixed to the rear end of the relay holder 9. Come spring 1
4 will be further compressed.

If the rear shaft cylinder 2 is still pulled, the sliding groove 13a of the rotary cam 13 will come off the cam tooth 9c of the relay holder 9, and the slope 9c' of the cam tooth 9c and the slope 12b of the protrusion 12e of the slide cam 12 will disengage. Rotating cam 13
The rotary cam 13 is rotated by a certain angle due to the relationship between the three slopes of the slope 13b of the protrusion 13c and the elastic force with the cam spring 14, and at that stage the front shaft cylinder 1 of the rear shaft cylinder 2 is rotated by a certain angle. When the tensile force on the rotating cam 1 is released, the elastic force of the cam spring 14 causes the rotating cam 1 to
The slope 13b of the protrusion 13c of No. 3 is engaged with the rear engaging portion 9f of the slope 9c' of the cam tooth 9c of the relay holder 9, and the rotary cam 13 is held in its position.
As a result, a gap is created in the axial direction between the rear shaft cylinder 2 and the front shaft cylinder 1, which becomes a position where pressing operation is possible for feeding out the lead lead. Next, when the rear barrel 2 is pressed against the front barrel 1, the front step portion 4c of the lead housing barrel 4 pushes the rear edge of the rotary cam 13, and the rotary cam 13 moves as described above. Since the slope 13b at the front end of the protrusion 13c engages and locks with the rear engaging portion 9f of the cam teeth 9c of the relay holder 9, the relay holder 9 moves forward with respect to the front barrel 1. . As a result, when the relay holder 9 is pushed and moves in the direction of the tip 3, the relay holder 9
When the collect chuck 10 fixed to the tip of the chuck moves forward while holding the lead core 18 in its mouth and moves a certain distance, the chuck ring 11 comes into contact with a step in the tip and its movement is restricted, and the tightening force on the collect chuck 10 is released. , the collection chuck 10 is released and moved forward. At this stage, the lead core 18 is released from the collect chuck 10, and its movement is stopped by the slight frictional resistance of the lead core through hole 3a of the tip 3, and although the collect chuck 10 continues to move forward, a certain amount of lead core 18 has been paid out. be done. When the collect chuck 10 is feeding out the lead core,
If the front barrel 1 and the rear barrel 2 are already in contact with each other, it is no longer possible to feed out the lead core 18, so the collection chuck 10 is opened and the lead core 18 is removed.
There is still a slight gap between the front barrel 1 and the rear barrel 2 at the time when the barrel is no longer being fed out.
(Fig. 7) When the pressing force of the rear barrel 2 to the front barrel 1 is released in the state shown in Fig. 7, the state shown in Fig. 6 is restored, and a certain length is attached to the tip of the tip 3. The lead core 18 that had been removed remains.

Next, we will explain the method of disabling the lead lead feeding action in the lead lead feeding mechanism, which is a feature of the present invention. The rotary cam 13, which has been engaged and locked with the rear engaging portion 9f of the slope 9c' of the cam tooth 9c of the holder 9, is pulled backward by the slide cam 12 and moves backward with respect to the relay holder 9, and eventually the relay holder When the slope 13c of the protrusion 13c is removed from the slope 9c' of the cam tooth 9c of 9, the cam spring 14
The rotating cam 1 is rotated by a certain angle due to the drag force, and when the tensile force on the rear shaft cylinder 2 is released at that point,
The protrusion 13c of No. 3 is guided by the gap groove 9d between the plurality of cam teeth 9c of the relay holder 9, and moves forward by the residual force of the cam spring 14, and the rotating cam 13 moves forward while pushing the slide cam 12. It comes into contact with the front engaging portion 9e. Its movement is controlled by the lead core housing cylinder 4 and the rear shaft inner cylinder 16 connected to the slide cam 12.
The end surface 2a of the rear barrel 2 is connected to the end surface 1 of the front barrel 1 through the
It stops at the position where the lead core can no longer be operated in contact with b.
In this state, the condition returns to that shown in FIG. 5, and the lead core feeding mechanism becomes unable to perform its lead feeding action.

FIG. 8 shows a state in which the lead core holding portion of the lead core feeding mechanism does not hold the lead core in its mouth.

The correct chuck 10 is the chuck ring 11.
Since it is about to close inward due to the elastic force of the compression coil spring 8, the closing angle is larger when the lead core is not held in the mouth than when the lead core is held in the mouth. In other words, the position of the collect chuck 10 with respect to the chuck ring 11 is located further back when the lead core is not held in the user's mouth than when the lead core is not held in the user's mouth. In other words, the relay holder 9 is positioned rearwardly with respect to the chuck ring 11 via the collect chuck 10.

The rear end surface of the chuck ring 11 is brought into contact with the front edge of the center shaft 7 by the elastic force of an indirect compression coil spring 8, and the center shaft 7 is fixed inside the tip of the front shaft tube 1. In other words, the relay holder 9 is located further rearward of the front barrel 1 when the collection chuck 10 does not hold the lead core than when it holds the lead core in its mouth. However, the lead core storage cylinder 4 always moves forward as the cam spring 14, which is resiliently pushed through one end of the spring stopper 15 fixed to the inside of the rear end of the relay holder 9, acts on the rotating cam 13 and the slide cam 12. Being under the force of movement,
The force of movement of the rear shaft cylinder 2 in the direction of the front shaft cylinder 1 through the rear shaft inner cylinder 16 which is threadedly connected by the rear screw 4a of the lead core housing cylinder 4 is exerted by the abutment of their end surfaces. Because of this, the positions of the parts connected to the lead core housing cylinder 4 do not change in any way compared to when the lead core is held in the front barrel 1 as shown in FIG. In other words, as mentioned above, even if the relay holder 9 is positioned rearward with respect to the front barrel 1, the lead core can be held between the inner bottom surface 9d of the middle inside of the relay holder 9 and the front end surface 12d of the slide cam 12. In this state (that is, in Fig. 5), there was a gap in the axial direction of (L+α), so even in this state, (L+α)−
It has a gap of L=α, and the front barrel 1 and the rear barrel 2.
There is no gap between them.

Next, to explain the method for replenishing the lead core storage tube 4 with lead core and the relationship between each part, in the embodiment, by rotating the rear barrel 2 with respect to the front barrel 1, the rear barrel 2 is The screws of the rear shaft inner cylinder 16 fixedly installed inside and the screws 4a of the lead core storage cylinder 4 are attached and detached, and when the rear shaft cylinder 2 is separated from the front shaft cylinder 1,
A joint 5, a lead storage cylinder 4, and an eraser body 6 are exposed at the rear of the front barrel 1, and by pulling out the eraser body 6 from the lead storage cylinder 4, a lead core 18 is stored inside the lead storage cylinder 4. It is something that can be centered. However, as described above, all of the movable parts of the lead lead feeding mechanism are not forcibly fitted to the front barrel 1, and are therefore configured as movable parts that are free to rotate. If this continues, the above-mentioned screw fitting will end up being idle and connection will not be possible. Therefore, in this embodiment, the inward protrusion for sliding along one or more axes provided on the inner circumferential surface of the center shaft 7 is used. 7c and one or more sliding grooves 9b provided on the front outer circumferential surface of the relay holder 9, the rotation of the front barrel 1 and lead housing barrel 4 is ultimately restricted. It's resolved.

Therefore, in addition to the embodiments, for example, the front barrel 1
Adopt an appropriate method such as configuring a rotation prevention between the relay holder 9, a rotation prevention between the lead core storage cylinder 4 and the joint 5, or a rotation prevention based on the relationship between the stopper 17 and the joint 5. You can also do it.

Furthermore, the method of attaching the rear shaft inner cylinder 16 and the lead core storage cylinder 4 is not limited to screws, for example, a single protrusion is raised at a position corresponding to the threaded part of the lead core storage cylinder 4, and the rear shaft inner cylinder A groove that changes 90 degrees is formed at the same position corresponding to the threaded part of No. 16, and locking with each other is completed by inserting the rear shaft cylinder 2 into the lead core storage cylinder 4 and rotating it until it stops on either the left or right side. method may be adopted. Furthermore, as the switching mechanism A, this embodiment is mainly used for knob-type ballpoint pens, and is
This is an application of the basic principle of the ratchet type cam mechanism, which is typified by Japanese Patent Publication No. 34-7181, that is, an "operation mechanism that can alternately push and pull," but is not limited to this. Various known forward/backward movement switching mechanisms may be employed, such as a typical heart-shaped ball-containing pressing device.

Since the present invention has the above-mentioned configuration and function, the tip of the rear barrel and the rear end of the front barrel are abutted and locked when not in use, so the rear end, which is a pressing part, Since the barrel becomes inoperable and the lead core feeding mechanism is disabled, there is no risk that the lead core may be accidentally knocked and the lead core may be fed out even if it receives unnecessary impact from other objects during storage or carrying. This can be reliably prevented.

In addition, when in use, by pulling out the lead barrel from the front barrel, a gap in the axial direction is formed between the lead lead feeding mechanism and the rear barrel. By pressing the barrel against the front barrel, the lead core can be fed out, and a plurality of lead cores stored in the lead core storage tube can be fed out one after another until the last one. What's more, when not in use, the entire length is reduced and compact, making it convenient for storing in clothing pockets, etc., but when in use, the overall length extends, allowing for a good grip balance when writing. It is convenient and has excellent effects.

In the other embodiment shown in FIG. 10, the rear barrel of the present invention is shortened and a clip attached to the rear barrel is attached to the front barrel, which fully demonstrates the features of the present invention. It is something to be satisfied with.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention; Fig. 1 shows the state when not in use, Fig. 2 shows it in use, Fig. 3 shows it when the lead core is fed out, and Fig. 4 shows the front barrel and rear shaft. External view of each cylinder when separated. FIG. 5 is an internal side sectional view of FIG. 1, FIG. 6 is of FIG. 2, and FIG. 7 is of FIG. 3. Figure 8 shows a cross section of the inside without the lead core in its mouth. Figures 9A to 9A are perspective views of main parts. FIG. 10 is an external view of another embodiment.
FIG. 11 is a developed view of the switching mechanism, and FIG. 12 is a cross-sectional view thereof. 1... Front barrel, 2... Rear barrel, 3... Tip, 4
... Lead core storage cylinder, 5 ... Joint, 6 ... Eraser body, 7 ... Center shaft, 8 ... Compression coil spring, 9 ...
Relay holder, 9c...Cam tooth, 10...Collection chuck, 11...Chuck ring, 12...
Slide cam, 13... Rotating cam, 14... Cam spring, 15... Spring stopper member, 16... Rear shaft inner cylinder, 17... Stopper, 18... Lead core, A...
Switching mechanism.

Claims (1)

[Scope of utility model registration request] A knock-type lead lead feeding mechanism is provided in the tip of the tip barrel, and a relay holder fixed to the collet chuck of the knock-type lead lead feeding mechanism is fitted into the tip barrel so as to be movable back and forth and biased rearward; The rear barrel attached to the rear of the lead storage tube fitted into the front barrel is biased to abut against the rear end of the front barrel, and the tip of the lead core storage tube is attached to the relay holder. A switching mechanism having a front engaging part and a rear engaging part is formed in the fitting part, and when the rear shaft cylinder is pulled out rearward, the lead core storage cylinder is connected to the front engaging part and the rear engaging part. By engaging with the front engaging part of the lead core housing cylinder, the rear barrel comes into contact with the front barrel and the lead core feeding operation is disabled, and the lead core housing barrel A sharpener characterized in that it can be alternately switched and set to a position where a push operation is possible for feeding out a lead core that forms a gap between a rear shaft cylinder and a front shaft cylinder by engagement with a rear engaging portion. pencil.