JPS5845914Y2 - Shape pencil - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement of a mechanical pencil in which the chuck spring is extremely weakened and the lead is fed out by using the inertia of a heavy body.

Mechanical pencils let out a fixed amount of lead at a time with the simple operation of shaking the traditional cursive hand without having to change their hands. The eraser support was secured by screwing them together or screwing them together.

Therefore, when the crown is screwed together, there is a disadvantage that each time the knob is pressed, a shock is applied to the crown, causing the crown to loosen or come off. This resulted in the drawback that the mechanical parts could not be replaced or repaired as necessary.

Moreover, these devices require a component called a crown, which increases the number of components and complicates the assembly process.

This invention solves all of the above-mentioned drawbacks by fitting a clip having a protrusion onto the shaft and locking the eraser support by the free raised part.

The structure of this invention will be explained in detail based on the drawings.
At the front part of the shaft 1 in FIG.
The connecting member 5 is screwed into the shaft 1 through the tip projection 1A, and a tightening ring 6 is loosely fitted into the groove 5B of the connecting member 5.

The load between the connector 5 and the core tank 7 is 200g when installed.
A chuck spring 8 with a very weak elastic force as described below is provided, and the chuck 9 and the core tank 7 are fixed to each other, so that the head 9A of the chuck 9 is normally pressed against the tightening ring 6. .

Further, due to the elastic force of the shaft spring 10 located at the rear of the lead tank 7 and configured between the shaft spring 10 and the internal IB of the shaft 1, the rubber support 11 is moved rearward with a force that does not succumb to the pressure applied when the eraser 12 is used. It's being fired.

The protrusion 13A of the clip 13 protrudes inward from the inner surface 1C of the shaft 1 so that the eraser support 11 does not come off backward.

That is, as shown in FIGS. 2 and 3, clip 1
3 has elasticity, and has a foot portion 13B at the tip and a cross section C at the rear end.
A shaped holding portion 13C is formed, and projections 13A are provided inside both ends of the holding portion 13C.

The holding part 13C of the clip 13 is fitted onto the rear part of the shaft 1, the foot part 13B is pressed against the surface 1D of the shaft 1 with an appropriate force, and the protrusion 13A of the clip 13 is inserted through the through-hole 1E of the shaft 1. The protrusion 13A protrudes inward from the inner surface 1C of the shaft 1, and the locking step 11A of the eraser support 11 is in contact with the protrusion 13A.

The rear part 7A of the lead tank 7 is inserted into the front part 11B of the eraser support 11, and the rear end 7B of the lead tank 7 is inserted into the front part 11B of the eraser support 11.
and the inner thigh 11C of the eraser support 11 are configured to be slightly separated from each other.

An elastic body 14 is attached to the protrusion 7C of the core tank 7,
A weight body 15 is loosely fitted between the elastic body 14 and the front end 11D of the eraser support 11.

An eraser 12 with an eraser case 16 fitted is fitted to the rear inner side 11E of the eraser support 11, and a knob 17 is fitted to the rear outer side 11F so as to cover the eraser 12. It stands out.

When assembling such a mechanism, a mechanism including a chuck 9 having an axially movable core tank 7, a chuck spring 8, and a weight body 15 slidably attached to the core tank 7 is used. is inserted into the shaft 1, then the shaft spring 10 is inserted, and the eraser support 11 is inserted against the elastic force of the shaft spring 10.

Further, the holding part 13C of the clip 13 is fitted onto the rear part of the shaft 1, and the protrusion 1 of the clip 13 is inserted through the through window 1E of the shaft 1.
3A protrudes inward to lock the locking stage 11 of the eraser support 11.
A, and the eraser support 11 is locked in a predetermined position.

The assembly is then completed by screwing the cap 4 into the threaded portion 5A of the connector 5 protruding from the tip of the shaft 1.

Next, in order to feed out the lead 2, the weight body 15 moves forward by swinging the shaft 1 in the B-+A force direction, and the inertial force of the weight body 15 moves the lead tank 7 and chuck 9 forward, and
Let out.

Further, when trying to feed out the spare lead 18 or return the protruding lead 2, by pressing the knob 17, the eraser support 11 comes into contact with the rear end 7B of the lead tank 7, and the chuck 9
It is possible to return the core 2 by unfolding it and letting out the spare core 18 or by pressing the protruding core 2 against the surface of the paper or your hand.

On the other hand, when it becomes necessary to remove the mechanism, the protrusion 13A of the clip 13 is removed from the through-hole 1E of the shaft 1, so that the protrusion 13A is disengaged from the locking step 11A of the eraser support 11, and the eraser support 11 is moved from the shaft 1. It is taken out from the rear end 1F.

This invention, which has the above structure and function, has a great practical effect in that the protrusion can easily protrude or retract from the inner surface of the shaft, reducing the number of parts and greatly simplifying the assembly process. It is something.

[Brief explanation of drawings]

Figure 1 is a longitudinal sectional view showing the mechanical pencil of this invention.
2 is a cross-sectional view taken along line X--X in FIG. 1, and FIG. 3 is a plan view showing the clip. 1...shaft, 1A...tip protrusion of shaft 1,
1B...Inner thigh of shaft 1, 1C...Inner surface of shaft 1, 1D...Surface of shaft 1, 1E...
Penetrating window of shaft 1, 1F... Rear end of shaft 1, 2...
... Core, 3... Core holder, 4...
Cap, 5...Connector, 5A...Threaded portion of the connector 5, 5B...Concave groove of the connector 5, 6...
...Tightening ring, 7... Core tank, 7A...
...Rear end of the core tank 7, 7B...Rear end of the core tank 7, 7C...Protrusion of the core tank 7, 8...
...Chuck spring, 9...Chuck, 9A...Head of chuck 9, 10...
・Axis spring, 11...Eraser support, 11
A... Locking stage of eraser support 11, 11 B.
...Front part of eraser support 11, 11C...
...Inner thigh of eraser support 11, 11D...Front end of eraser support 11, 11E...Rear inner side of eraser support 11, 11F...Eraser support 1
1 rear outside, 12... Eraser, 13...
... Clip, 13A ... Protrusion of clip 13, 13B ... Foot part of clip 13, 13C.
...Holding portion of clip 13, 14...Elastic body, 15... Weight body, 16... Eraser case, 17... Knob, 18...
Spare core.

Claims (1)

[Scope of utility model registration request] A chuck with a core tank that is movable in the axial direction while housed in the shaft, a chuck spring with a weak elastic force, and a weight body slidably attached to the core tank, and is capable of swinging the shaft. In a mechanical pencil in which the lead is gradually drawn out using the inertia of a heavy body, the shaft 1 is provided with one or more through windows 1E, and the protrusion 13A of the clip 13 is inserted through the through windows 1E of the shaft 1 into the inner surface 1C of the shaft 1. A mechanical pencil characterized in that the eraser support 11 is abutted against the protrusion 13A by a shaft spring 10 which is protruded further inward and is provided between the shaft 1 and the eraser support 11.