JP2525735Y2 - Swiveling mechanical pencil - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swing type mechanical pencil which advances a chuck by an inertial force of a weight body generated by shaking a shaft cylinder and extends a lead.

[0002]

2. Description of the Related Art In a conventional swing-out mechanical pencil, in order to prevent the chuck from advancing and the core being pulled out when an eraser is used, an eraser support is attached to the rear in the longitudinal direction by a spring having a relatively strong elasticity. I was rushing.

[0003]

However, the above-mentioned device has a large number of parts, and has a very low productivity and a high price because it is assembled by stretching a spring. Moreover, when performing a knocking operation for causing the next core to follow the inside of the chuck, the spring having a relatively strong elasticity described above must be compressed, and the knocking hand becomes painful, or the knocking by pressing the eraser is not possible. However, when the worn-out and shortened eraser is used by being floated from the bottom of the rear hole of the eraser support, there is a problem that the eraser enters the eraser support. An object of the present invention is to provide a draw-out mechanical pencil that solves the above-mentioned problems.

[0004]

According to the present invention, a rear edge or an inner step of an opening window is formed at a rear portion of a barrel, and a locking portion is formed on an eraser support so as to be flexible. The locking portion of the eraser support is lockably locked to the rear edge or the inner step of the opening window of the barrel,
Attach the eraser support to the barrel so that it can slide for an appropriate distance. The eraser support and the weight body are configured to be able to abut.

[0005]

1 and 2 show a first embodiment of the present invention, wherein a base 2 is screwed into a front portion of a barrel 1 and a core holder 4 for lightly holding a core 3 in the base 2. FIG. Is built-in.
A washer 5 is clamped between the inner step 2A of the base 2 and the front end 1A of the barrel 1. The washer 5 and the base 2
A locking ring 6 is loosely fitted between the locking step 2B and a connector 8 which is fixed to a rear portion of a chuck 7 for externally fitting the locking ring 6 to a head 7A. Moreover, a chuck spring 9 having relatively low elasticity is stretched between the washer 5 and the outer flange 8A at the front end of the connector 8, and the chuck 7 is normally pressed against the tightening ring 6 and closed to hold the core 3. .
A lead tank 10 for accommodating the spare lead 3 is connected to the connector 8, and a weight body 11 is fitted on the outside of the lead tank 10. An elastic piece 12C, which is cut out in a U-shape and formed to be bent, is formed in a small-diameter front portion 12B of the eraser support 12 having an eraser 13 provided in a rear hole 12A.
Is formed with a raised locking portion 12D. The small-diameter front portion 12B of the eraser support 12 is inserted from the rear end of the barrel 1 so that the locking portion 12D of the eraser support 12 can be slid by an appropriate distance into an opening 1B formed at the rear of the barrel 1. It is fitted. An eraser support 1 is provided on the rear edge of the opening window 1B of the barrel 1
2 can be stopped, so that the shaft cylinder 1
There is no possibility that the eraser support 12 comes off. Therefore, the weight body 11 includes the outer flange 8B of the connector 8 and the eraser support 1.
2 is slidable. Further, the rear end of the core tank 10 and the inner flange 12E of the eraser support 12 are configured to be in contact with each other, but may be in contact with each other or may be slightly separated.

In the first embodiment, in order to extend the lead 3, the weight body 11 is moved by the inertial force generated by shaking the barrel 1.
Is advanced, and the weight 11 is brought into contact with the outer flange 8B of the connector 8. Then, the chuck spring 9 is compressed by the inertial force of the weight body 11, the chuck 7 advances, and the core 3 is extended. The weight body 11 moves rearward due to the reaction abutting on the connector 8 and the front end 12 of the eraser support 12.
F, but because the locking portion 12D of the eraser support 12 is abutted against the rear edge of the opening window 1B of the barrel 1, the eraser support 12 receives the weight 11 without coming off the barrel 1. . When the eraser 13 is used, since the rear large diameter portion 12G of the eraser support 12 is held by hand, there is no possibility that the chuck 7 advances and the core 3 is extended at this time. Also, in order to refill the core 3 in the core tank 10,
Remove the eraser 13 and the through hole 12H of the eraser support 12
The core 3 may be inserted, or the locking portion 12D may be pressed inward of the barrel 1 to remove the eraser support 12 from the barrel 1 and insert the core 3 from the rear end of the core tank 10. good. Then, in order to cause one core 3 to be consumed and follow the next core 3, first, when the eraser 13 is pressed, the opening window 1 of the shaft cylinder 1 is pressed.
The locking portion 12D of the eraser support 12 moves forward, and the inner flange 12E of the eraser support 12 comes into contact with the rear end of the core tank 10. Then, the lead tank 10 moves forward together with the eraser support 12, so that the lead 3 is followed in the same manner as in the conventional swing-out mechanical pencil.

As another embodiment of attaching an eraser support to a shaft cylinder, there is a second embodiment shown in FIGS. 3, 4, 5 and 6. In this method, an opening window 101B formed at the rear of the barrel 101 is formed of a wide portion 101C and a narrow portion 101D located behind the wide portion 101C.
1C and the narrow width portion 101D are connected by an inclined portion 101E. Further, a protrusion 112I having a substantially mountain-shaped cross section and a narrow locking portion 112D extending rearward from the protrusion 112I are formed on the elastic piece 112C of the eraser support 112. Then, while fitting the raised portion 112I of the eraser support 112 into the wide portion 101C of the opening window 101B of the shaft cylinder 101,
An eraser support 112 is attached to the narrow portion 101D of the opening window 101B.
And the eraser support 112 can slide on the shaft cylinder 101 by an appropriate distance. still,
Eraser support 112 on the rear edge of opening window 101B of shaft cylinder 101
Of the shaft cylinder 1 can be stopped.
There is no risk that the eraser support 112 will come off from 01. Therefore, in the normal state, even if a force is applied to the eraser support 112 in the rotation direction, the eraser support 112 does not rotate because the locking portion 112D comes into contact with the narrow width portion 101D, but the eraser support 112 is urged backward by the chuck spring. Core tank 10
, While moving the eraser support 112 forward,
12D is positioned at the wide portion 101C of the opening window 101B, as shown in FIG. 7, and in this state, a force in the rotating direction is applied to the eraser support 112.
The slope of 12I is in contact with the edge of the wide portion 101C. Then, the elastic piece 112C of the eraser support 112 is bent inward, and the locking portion 112D is deformed inward from the inner surface of the shaft cylinder 101,
When the eraser support 112 is further rotated, the raised portion 112I
In addition, the locking portion 112D is disengaged from the opening window 101B of the barrel 101 and penetrates into the inner surface of the barrel 101. If the eraser support 112 is pulled backward in this state, the eraser support 112
Can be easily removed from the shaft cylinder 101.

Further, as in the third embodiment shown in FIGS. 8 and 9,
The elastic piece 212C of the eraser support 212 is formed with a locking portion 212D simply raised in a substantially mountain shape in cross section, and the locking portion 212D is formed.
May be slidably fitted into the opening window 1B of the shaft cylinder 1 for an appropriate distance. In this case, simply use the eraser support 21
By rotating the shaft 2, the shaft tube 1 can be easily removed.

In the case of the second and third embodiments, since the eraser support can be easily removed from the shaft cylinder, it is possible to easily refill the lead tank to the lead tank.

Further, as a construction for attaching an eraser support to the shaft cylinder, there is a fourth embodiment shown in FIG. This forms the inner step 201F at the rear part of the shaft cylinder 201, and forms the outer flange-shaped locking part 312D at the front part of the eraser support 312,
The locking portion 312D is divided into several parts by a cut groove extending in the longitudinal direction to give elasticity. The locking portion 312D of the eraser support 312 is inserted from the rear end of the shaft cylinder 201 to insert the inner step 201F.
, The locking portion 312D and the inner step 201F can be impacted, and the eraser support 312 is attached to the shaft cylinder 201 so as to be slidable by an appropriate distance. In this case, eraser support 3
12 cannot be removed, the eraser 13 is removed, and the core 3 is replenished from the through hole 312H of the eraser support 312.

Also, as in the fifth embodiment shown in FIG.
The eraser support 412 may be configured to cover the eraser 13 by covering the knob 14.

The mechanical part of the swing-out mechanical pencil according to the present invention is not limited to that of the above-described embodiment. For example, as in the sixth embodiment shown in FIG. It may be formed integrally with the front part.

Further, in each of the above-mentioned embodiments, the front outer flange of the connector is centered by the inner surface of the front end of the shaft cylinder to prevent the center tank and the chuck from being biased.
As in the seventh embodiment shown in FIG. 14, a rib 401H may be formed at the front of the barrel 401, and the front flange 8A of the connector 8 may be centered by the rib 401H.

[0014]

The drawing mechanical pencil of the present invention described above has a small number of parts and can be produced very easily, so that it can be provided at a lower price than conventional ones. In addition, since the knock operation for following the next lead can be performed with a slight knock force, the operation is very easy.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a plan view showing the eraser support of the first embodiment of the present invention.

FIG. 3 is a sectional view showing a main part of a second embodiment of the present invention.

FIG. 4 is a plan view of FIG. 3;

FIG. 5 is a sectional view taken along line AA in FIG. 3;

FIG. 6 is a sectional view taken along line BB in FIG. 3;

FIG. 7 is a main part plan view showing a state where an eraser support in the second embodiment is advanced.

FIG. 8 is a sectional view of a main part showing a third embodiment of the present invention.

FIG. 9 is a plan view of FIG.

FIG. 10 is a sectional view showing a fourth embodiment of the present invention.

FIG. 11 is a sectional view showing a main part of a fifth embodiment of the present invention.

FIG. 12 is a sectional view showing a sixth embodiment of the present invention.

FIG. 13 is a sectional view showing a seventh embodiment of the present invention.

FIG. 14 is a sectional view taken along line AA of FIG. 13;

[Explanation of symbols]

1. 101/201/301/401 Shaft tube 1B / 101B Opening window of shaft tube 1/101 201F Inner stage of shaft tube 201 3 core 7 Chuck 11 Weight body 12/112/212/312/412 Eraser support 12D / 112D・ 212D ・ 312D Eraser Supports 12 ・ 112 ・ 212 ・ 312 Locking Part 13 Eraser

Claims (1)

(57) [Scope of request for utility model registration] 1. A swing-out mechanical pencil, in which a chuck is advanced by an inertial force of a weight body generated by shaking a shaft cylinder to feed out a lead, an eraser support provided with an eraser is formed with a flexibly engaging portion. The locking part is locked to the opening window edge or the inner step of the barrel so as to be able to stop against it, and the eraser support is slidably attached to the barrel, so that the weight body can contact the eraser support. A draw-out mechanical pencil that is a feature.