JPS5835513Y2 - Shape pencil - Google Patents

Description

[Detailed explanation of the invention] The purpose of this invention is to prevent the strength of the lead from decreasing in mechanical pencils that use the inertia of a heavy body generated by shaking to feed out the lead, and to improve the tracking of refills. That is.

Utilizing the inertia of the heavy body, and before the front end of the chuck contacts the mouthpiece or lead holder and before the chuck spring is fully compressed, the connecting tool or shaft contacts the lead tank to form a chuck and lead tank. The lead +-3 drawn out by a mechanical pencil stops the forward movement of Chubu Denta.
The strength of the lead is significantly lower than that of a normal knock-type mechanical pencil when it is drawn out, which is a serious problem in practice.

In addition, there was also a problem in lead tracking because it was difficult for the lead in the lead tank to fall into the chuck.

The reason for this is unclear, but it is probably due to the inertial force of the heavy body, which creates a strong repulsive force when the connector or shaft contacts the core tank (or the chuck contacts the tightening ring with an unnecessarily strong force and closes. It is thought that the strength of the core decreases because of the

In addition, regarding lead tracking, the repulsion force is strong and the opening time of the chuck is short, making it difficult for the refill to fall into the chuck.

As a result of intensive studies to eliminate these drawbacks, it has been discovered that all of the above-mentioned drawbacks can be eliminated by attaching an elastic body between the core tank and the weight body.

The structure of this idea will be explained in detail based on the drawings.
At the front part of the shaft 1 in FIG. 1, a base 4 having a built-in lead holder 3 for lightly holding the lead 2 is screwed onto the connector 5 via the tip protrusion 1A of the shaft 1. The tightening ring 6 is loosely fitted into the concave groove 5A of the connector 5.

A chuck spring 8 with a very weak force is provided between the connector 5 and the lead tank 7, and since the chuck 9 and the lead tank 1 are fixed, the head 9A of the chuck 9 is normally attached to the tightening ring 6. It is constructed in a pressed manner.

The rear end 5B of the connector 5 and the front end IA of the core tank γ are configured to be able to come into contact with each other, and the thickness of the cylindrical portion 9B is made thin (the distance from the front end 9C of the configured chuck 9 to the inner thigh 4A of the base 4). The distance obtained by subtracting the fully compressed length from the installed length of the chuck spring 8, which is compressed when L1 and the chuck 9 move forward, is less than the distance L2 from the rear end 5B of the connector 5 to the front end 7A of the core tank γ. It also consists of a long

A weight body 10 having a tapered portion 10A on the inner surface of the front and rear ends is loosely fitted into the core tank portion, and a through hole 11k larger than the diameter of the layer passing hole 9D of the chuck 9 is formed in the inner thigh IB of the core tank γ. The elastic body 11 is fixedly attached to the elastic body 11.

A head crown 12 is screwed to the rear end IB of the shaft 1, and an eraser support 13 with a front narrow diameter portion 13A inserted into the lead tank T is attached to the head crown 12 by a shaft spring 14 between it and the rear inner stage IC. The eraser 15 is configured to abut with a force that is not succumbing to pressure when in use, and the inner rear stage 13B is configured in the shape of a cone, with a lead insertion hole 13C having a diameter slightly larger than the core diameter drilled in the center. There is.

The weight body 10 reciprocates between the rear end 11B of the elastic body 11, which is configured to be slightly longer than the length of a general refill, that is, 60+m, and the front end 13D of the eraser support 13, and A refill 16 is stored.

An eraser 15 fitted with an eraser case 11 is fitted to the rear inner side 13E of the eraser support 13, and a knob 18 is fitted to the rear outer side 13F so as to cover the eraser 15. It stands out.

Next, to explain the action in FIG. 1, in order to feed out the core 2, by swinging the shaft 1 in the B-+A force direction, the front end 10B of the weight body 10 comes into contact with the elastic body 11, and the weight body 1
By gently transmitting the acting force of 0 to the core tank 1, the core tank γ
is moved in the direction B→A against the elastic force of the chuck spring 8.

Therefore, the chuck 9 attached to the lead tank 7 also remains attached to the tightening ring 6, that is, while holding the lead 2, B +
Move in the A force direction.

At this time, the lead 2 moves forward against the holding force of the lead holder 3 built into the base 4.

Then, when the central electric body further moves from B to A, the tip 6A of the tightening ring 6 hits the concave groove front stage 5C of the connector 5,
The movement of the clamping ring 6 is stopped, but the core 2 is released so that the chuck 9 can move forward further.

When the front end γA of the core tank 1 comes into contact with the rear end 5B of the connector 5, the forward movement of the middle electric body is stopped, and at the same time, the forward movement of the weight body 10 is also stopped while being absorbed by the elastic body 11.

Therefore, the repulsive force with which the middle electric body containing the weight body 10 comes into contact with the connector 5 is weakened, the weight body 10 and the middle electric body are moved backward by the elastic force of the chuck spring 8, and the chuck 9 is pushed back against the tightening ring 6. It is gently pressed closed, holding the lead 2, and returning to the writing state shown in FIG.

FIG. 2 shows that a weight body 110 having a tapered portion 110A on the inner surface of the rear end is loosely fitted into the core tank 101, and
This shows an embodiment in which an elastic body 111 having a through hole 111A having a diameter larger than the diameter of the layer passing hole 109D of the chuck 109 is fixed to the front end 110B of the weight body 110.

FIG. 3 shows a weight body 210 having a tapered portion 210A on the inner surface of the front and rear ends loosely fitted into the core tank 201, and a chuck 209 between the inner thigh 207B of the core tank 207 and the front end 210B of the weight body 210. This shows an embodiment in which an elastic body 211 having a through hole 211A having a diameter larger than the diameter of the layer passing hole 209D is loosely fitted.

In FIG. 4, a weight body 310 having a tapered portion 310A on the inner surface of the front and rear ends is loosely fitted into the core tank 301, and an elastic body 311 is fixed to the inner thigh 30TB of the core tank 307. Rigid tube 1 at the rear end and through hole
9 is fixed, the inner diameter 19A of the throttle tube 19 is made larger than the core diameter, and the rear end 19B is formed into a dome shape.

FIG. 5 shows that a weight body 410 is loosely fitted on the outside of the core tank 407, and the weight body 410 is fitted loosely on the outside of the core tank 407.
This shows an embodiment in which an elastic body 411 that can come into contact with the front end 410B of the front end 410B is fixedly attached.

FIG. 6 shows that a weight body 510 is loosely fitted on the outside of the core tank 501, and that the core tank 501 is attached to the front end 510B of the weight body 510.
This shows an embodiment in which an elastic body 511 that can come into contact with the protrusion 507C is fixedly attached.

FIG. 1 shows a weight body 610 loosely fitted on the outside of a core tank 607, and a front end 610B of the weight body 610 and a core tank 60γ.
This shows an embodiment in which an elastic body 611 is loosely fitted between the protrusion 60γC and the protrusion 60γC.

The effects of such a structure and operation are clearly shown in the table below.

As seen in this table, there is a clear difference in the strength of the unfeeding lead when used without an elastic body attached and when used with an elastic body attached, so the elastic It can be seen that when the body is not used, the strength decreases so drastically that it becomes a practical problem.

As explained above, this invention prevents the strength of the lead from decreasing or the refill from falling into the chuck by attaching an elastic body to the contact area where the lead tank and the weight body come into contact. The practical effects are great, such as improving the durability of the chuck and chuck spring, and eliminating the contact noise of heavy objects.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing this invention, and Figs. 2, 3, 4, 5, 6, and 7 are longitudinal sectional views of main parts showing other embodiments of this invention. It is. 1... shaft, IA... tip protrusion of shaft 1,
1B: rear end of shaft 1, IC: shaft 1
Rear inner stage, 2...core, 3...core holder, 4...cap, 4A...inner thigh of cap 4, 5... ... Connector, 5A --- Concave groove of series knot 5, 5B... Rear end of connector 5, 5C...
... Concave groove front stage of connector 5, 6 ... Fresh ring, 6A
...Tip of tightening ring 6, 7,107,20γ,
307,407゜507.607... Core tank, 7A... Front end of core tank 1, 7B, 207B
, 207B... Core tank γ, inner thigh of 207, 307, 407C, 507C. 60γC・・・ Core tank 407, 507, 607
Protrusion, 8... Chuck spring, 9, 10
9゜209...Chuck, 9A...Head of chuck 9, 9B...Cylinder part of chuck 9,
9C...Front end of chuck 9, 9D, 109D,
209D...Layer passing hole of chuck 9.109, 209, 10,110°210.310,410,51
0,610...Heavy body, 10A, 110A, 2
10A, 310A... Weight body T0, 110, 2
10,310 taper part, IOB, 110B, 210
B, 410B. 510B, 610B... Front end of weight body 1C2110°210.410,510,610, 11°111
．． 211, 311.41L51L611...Elastic body, IIA, l11A, 211A...Through hole of elastic body 11, 111, 211, 11B...Rear end of elastic body 11, 12... Crown, 12A...
...Rear end of crown 12, 13...Eraser support, 13A...Front narrow diameter part of eraser support 13, 1
3B...Inner rear stage of eraser support 13, 13C
... Core insertion hole of eraser support 13, 13D...
...Front end of eraser support 13, 13E...
Rear inner side of eraser support 13, 13F... Rear outer side of eraser support 13, 14... Axis spring, 15... Eraser 16... Refill,
17...Eraser case, 18...Knob, 19...Tube, 19A...Inner diameter of tube 19, 19B...Inner diameter of tube 19 Rear end.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A mechanical pencil in which the lead is gradually drawn out by the back-and-forth movement of a lead tank, which is equipped with a chuck on the front with a tightening ring externally fitted, which is slidable relative to the lead tank. A mechanical pencil characterized by having an elastic body attached between it and a heavy body. 2. An elastic body having a through hole with a diameter equal to or larger than the diameter of the core passage hole of the chuck is attached between the inner thigh of the core tank and the weight body loosely fitted inside the core tank. A mechanical pencil according to claim 1 of the utility model registration claim. 3. The mechanical pencil according to claim 1 of the utility model registration, characterized in that an elastic body is attached between the protrusion of the lead tank and a weight body loosely fitted on the outside of the lead tank. 4. The mechanical pencil according to claim 2 or 3 of the utility model registration, characterized in that an elastic body is fixed to one or both of the lead tank and the weight body. 5. The mechanical pencil according to claim 2 or 3 of the utility model registration, characterized in that an elastic body is loosely fitted between the lead tank and the weight body.