JP2606820Y2 - Chuck mounting structure of swing-out 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 chuck mounting structure for 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 draw out a lead.

[0002]

2. Description of the Related Art As a conventional chuck mounting structure of a swing-out mechanical pencil, the rear portion of the chuck is press-fitted into an inner hole of a connector, and the outer stage of the chuck is brought into contact with the front end of the connector to position the chuck. .

[0003]

However, when the outer stage of the chuck is brought into contact with the front end of the connector, an excessive compressive stress is applied to the chuck, and the elastic piece is thin for the mechanical pencil. In the chuck formed as described above, there is a problem that the elastic piece is bent or broken. An object of the present invention is to provide a chuck mounting structure for a swing-out mechanical pencil that solves the above-mentioned problems.

[0004]

According to the present invention, a slit is formed longitudinally rearward from a front end to divide the elastic piece of the chuck into several parts, and the thickness of the elastic piece is reduced. Of this chuck
With a locking ring fitted on the head and a core tank fixed on the back
Install a chuck spring between the connector and the washer.
Attaching the tightening ring to the washer by mounting
You. Furthermore, the distance from the front end of the chuck to the rear end of the connector is regulated to the standard size, the rear part of the chuck is pressed into the inner hole of the front part of the connector, and there is an appropriate gap so that the step part of the chuck does not contact the step part of the connector. It is configured as follows.

[0005]

2 and 3 show an embodiment of the present invention. A base 2 is screwed into a front portion of a barrel 1 and a core holder 4 for holding a core 3 lightly is built in the base 2. FIG. Have been. or,
A washer 5 is held between the inner step 2A of the base 2 and the front end 1A of the barrel 1. A tightening ring 6 is loosely fitted between the washer 5 and the locking step 2B of the base 2, and the tightening ring 6 is fitted to the head 7A of the chuck 7 outside. The chuck 7 is made of metal, and has a cut groove formed longitudinally rearward from the front end to be divided into several parts to form an elastic piece 7B. Moreover, the elastic piece 7B is made thin. The reason for this is that even if the chuck 7 is pressed against the tightening ring 6 by the chuck spring 8 having a relatively low elasticity, the elastic piece 7B bends and the chuck 7 needs to be closed. Further, a raised portion 7C having a vertical front surface and an inclined rear surface is formed at the rear portion of the chuck 7.
Is press-fitted into a front inner hole of the resin connector 9. The positioning of the chuck 7 when the chuck 7 and the connector 9 are press-fitted is performed as shown in FIG.
Is made by matching a dimension L from the front end of the connector to the rear end of the connector 9 with the standard dimension. At this time, the outer step of the chuck 7
7D, front end step 9C of connector 9 and rear end of chuck 7
A chuck such as the step 7E and the inner step 9D of the connector 9
There is no contact between the step of the connector 7 and the step of the connector 9
So as to be appropriately separated. Moreover, a chuck spring 8 having relatively low elasticity is stretched between the washer 5 and the outer flange 9A of the front end of the connector 9, and the chuck 7 is normally pressed against the fastening ring 6 and closed to hold the core 3. . The lead tank 1 for storing the spare lead 3 in the connector 9
0 is connected, and the weight body 11 is externally fitted to the outside of the core tank 10. An elastic piece 12C that is cut out in a U-shape and formed to be bent is formed in a small-diameter front portion 12B of an eraser support 12 having an eraser 13 provided in a rear hole 12A.
A raised locking portion 12D is formed in 2C. 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. Since the locking portion 12D of the eraser support 12 can be stopped at the rear edge of the opening window 1B of the barrel 1, there is no possibility that the eraser support 12 comes off the barrel 1. Therefore, the weight body 11 is configured to be slidable between the outer flange 9B of the connector 9 and the eraser support 12. Also, core tank 1
The rear end of the zero and the inner flange 12E of the eraser support 12 are configured to be abuttable, but they may be abutted or slightly separated.

In order to feed out the core 3 in this embodiment,
The weight body 11 is advanced by an inertial force generated by shaking the barrel 1, and the weight body 11 is brought into contact with the outer flange 9B of the connector 9. Then, the chuck spring 8 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 against the connector 9 and comes into contact with the front end 12F of the eraser support 12, but the locking portion 12D of the eraser support 12 is connected to the rear edge of the opening window 1B of the shaft cylinder 1. The eraser support 12 receives the weight 11 without coming off the shaft cylinder 1. When the eraser 13 is used, the rear large-diameter portion 12G of the eraser support 12 is held by hand.
At this time, there is no possibility that the chuck 7 moves forward and the lead 3 is extended. Further, in order to refill the core 3 into the core tank 10, the eraser 13 may be removed and the core 3 may be inserted through the through hole 12H of the eraser support 12, or the locking portion 12D may be inserted into the shaft cylinder 1 inward. To remove the eraser support 12 from the shaft cylinder 1 and insert the core 3 from the rear end of the core tank 10. And in order for one core 3 to be consumed and the next core 3 to follow,
First, when the eraser 13 is pressed, the locking portion 12D of the eraser support 12 advances the opening window 1B of the barrel 1 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.

[0007]

Further, the materials of the chuck and the connector are not limited to those of the above-described embodiment, and it is needless to say that various conventionally known materials can be used.

[0009]

[Effect of the Invention] The chuck mounting structure of the swing-out mechanical pencil of the present invention described above has a thin elastic piece.
The chuck can be press-fitted into the connector without bending or breaking, and the productivity is remarkably improved as compared with the conventional one. In addition, chucks, tightening phosphorus
, Washers, chuck springs and connectors
Because it can be configured as one unit,
It can be easily attached to and detached from the
Short standard dimensions from the front end of the jack to the rear end of the connector
The paddle makes it easier to manage the dimensions during assembly
A special effect can be achieved.

[Brief description of the drawings]

FIG. 1 is an enlarged cross-sectional view illustrating a chuck mounting structure of a swing-out mechanical pencil of the present invention.

FIG. 2 is a cross-sectional view illustrating a swing-out mechanical pencil using the chuck mounting structure of the present invention.

FIG. 3 is a plan view showing the eraser support and the eraser in FIG. 2;

[Explanation of symbols]

 Reference Signs List 1 shaft cylinder 3 core 7 chuck 7B elastic piece of chuck 7 9 connector 11 weight body

Claims (1)

(57) [Scope of request for utility model registration] An elastic piece of a chuck divided into several parts by forming a slit in a longitudinal direction is formed to have a small thickness, and the chuck is moved forward by an inertial force of a weight body generated by swinging a shaft cylinder. In the swing-out mechanical pencil that draws out
Attach the tightening ring to the head of the chuck and attach the lead tank to the back.
Chuck spr between the fixed connector and washer
Washing the tightening ring by washer by stretching the ring
The front end of the chuck and the rear end of the connector are restricted to standard dimensions, the rear part of the chuck is pressed into the front inner hole of the connector, and the step part of the chuck and the step part of the connector are brought into contact. A chuck mounting structure for a swing-out mechanical pencil characterized by being appropriately spaced apart so as not to be disturbed.