JPS6021277Y2 - Shape pencil - Google Patents

Description

[Detailed description of the invention] This invention is a mechanical pencil in which the lead is drawn out by shaking the writing body in the axial direction, and prevents the lead from drawing out due to vibrations when carried.

Mechanical pencils whose lead is drawn out by shaking the writing instrument in the axial direction have a chuck spring with an extremely weak elastic force compared to conventional mechanical pencils whose lead is drawn out by a knock, and the lead tank is Since the weight body is slidably attached, there is a drawback that the core may be drawn out due to vibrations caused when the owner runs or rides a bus while carrying the device.

This device is equipped with a centering prevention device that causes the chuck to disengage from the tightening ring and expand when the lead tank is moved forward when being carried, so that even if the lead tank slides due to the movement of a heavy object, the lead will not stop. The purpose is to provide a mechanical pencil that does not unwind.

This invention will be explained based on the drawings. As shown in FIG. A tightening ring 6 is loosely fitted between the interior 3A of the base 3 and the interior 4A of the connector 4.

A chuck spring 8 is provided between the connector 4 and the front stage 7A of the core tank 7, and the load at the time of installation is limited to 2009 or less, and the chuck 9 is fixed to the core tank 7, so that the normal chuck 9 The head 9A is pressed against the tapered surface 6A of the tightening ring 6.

A weight body 10 is loosely fitted between the front inner stage 7B and the inner surface protrusion 7C of the wick tank 7, and several wicks 1 are stored inside the weight body 10.

A sliding body 11 is loosely fitted inside the shaft 5, and the sliding body 1
A shaft spring 12 is provided between the front end 11A of the slider 1 and the interior 5B of the shaft 5, and the interior 11B of the sliding body 11 is normally biased toward the front end 13A of the spring body 13.

The spring body 13 has a spring piece portion 13B that is always expanded outward, and a support portion 13C of the spring body 13.
is fixed to the inner surface 5C of the shaft 5.

A button 14 is fixed to the spring piece 13B of the spring body 13, and the button 14 is provided so as to always protrude from the through hole 5D of the shaft 5.

An eraser support tube 15 is fixed to the sliding body 11, in which an eraser 18 having a knob 16 attached to an outer surface 15A and an eraser case 17 attached to an inner surface 15B is fitted.

Next, to describe the operation in FIGS. 1 and 2, in order to feed out the lead 1, in the state shown in FIG. 1, when in use, the weight body 10 is slid by swinging the mechanical pencil in the axial direction. It collided with the front inner stage 7B of the core tank 7,
The inertial force of the weight body 10 overcomes the elastic force of the chuck spring 8, so that the core tank 7 and the chuck 9 move forward.

At this time, the tightening ring 6 is externally fitted onto the head 9A of the chuck 9, and the chuck 9 is closed, and since the lead 1 is strongly held, the lead 1 is attached to the chuck 9 in the same way as in a conventional knock-type mechanical pencil. is moved forward, and the lead 1 is fed out by a certain amount.

Next, when returning the lead 1, the eraser support tube 15 moves forward by knocking the knob 16 in the same manner as in conventional knock-type mechanical pencils, and the front end 11A of the sliding body 11 comes into contact with the rear end 7D of the lead tank 7. The chuck 9 and the lead tank 7 are moved forward, and the fastening ring 6 comes into contact with the inner thigh 3A of the mouthpiece 3, thereby expanding the chuck 9, and the lead 1 is returned by being pressed against a finger or the surface of the paper.

When using the centering prevention device for carrying, first perform the same operation as the one described above to return the core 1, and then remove the chuck 9.
Remove the head 9A from the tightening ring 6 and open the chuck 9.

By further pushing the knob 16, the front end 13 of the spring body 13 is
A comes off from the inner surface 11C of the sliding body 11, and the spring body 13 expands outward.

Then, when you stop pushing the knob 16, the rear end 11D of the sliding body 11 comes into contact with the front end 13A of the spring body 13, and since the rear end 7D of the core tank 7 comes into contact with the front end 11A of the sliding body 11, the core The tank 7 is prevented from moving rearward in the axial direction (A-B direction), and the chuck 9 maintains its expanded state.

In this state, even if the weight body 10 slides and the core tank 7 is moved forward, the chuck 9 does not hold the core 1, so the core 1
will never move forward.

Next, when canceling the centering prevention device, by pressing the button 14, the spring piece 13B of the spring body 13 is bent inward and removed from the rear end 11D of the sliding body 11, and the elastic force of the shaft spring 12 causes it to slide. The moving object 11 moves in the A-B direction,
The front end 13A of the spring body 13 comes into contact with the inner thigh 11B of the sliding body 11 and returns to the state shown in FIG. 1.

This device, which has the structure and function described above, allows the lead to be drawn out simply by shaking the shaft without knocking, and there is no need to draw out the lead unnecessarily when carrying the device. This has an excellent effect in that it does not protrude and stain or damage the pockets of clothes.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing this invention, and FIG. 2 is a longitudinal sectional view showing the centering prevention device in FIG. 1 in an activated state. 1...core, 2...core holder, 3...
...Base, 4...Connector, 5...
Shaft, 6... Tightening ring, 7... Core tank, 8... Chuck spring, 9...
Chuck, 10... Heavy body, 11...
Sliding body, 12... Axis spring, 13...
...Spring body, 14...Button, 15...
・Eraser support tube, 16...Knob, 17...
...Eraser case, 18... Eraser.

Claims (1)

[Scope of utility model registration request] Attach the cap 3 having the core holder 2 to the tip of the shaft 5,
The core tank 7 having the chuck 9 with the tightening ring 6 fitted onto the head 9A has a load of 200 when the chuck spring 8 is attached.
It is always ejected backward in the axial direction with an elastic force less than y, and the axis 5
In addition, a weight body 10 is attached to the core tank 7.
is slidably attached, and a spring body 13 whose one end is fixed to the inner surface 5C of the shaft 5 is elasticized outwardly so as to protrude from the through hole 5D of the shaft 5, and the button 14 is fixed to the eraser support cylinder 15. A mechanical pencil characterized in that a shaft spring 12 is stretched between a sliding member 11 to which is fixedly attached and an inner portion 5B of a shaft 5, so that the sliding member 11 is brought into contact with a spring member 13.