JPS5842140Y2 - Connector - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a coupling device for a knock-type mechanical pencil, which is inserted from the head side of the chuck to fix the mechanical part to the barrel.

Conventional connectors that are inserted from the head side of the chuck include those that insert a C-shaped ring from the side of the chuck head, and those that combine two divided connectors on a tightening ring. In the case of a C-shaped ring, the parts are small and the C-shaped ring may have to be spread out to be inserted, which makes assembly inefficient, and in the case of a two-piece connector, it is difficult to assemble with one hand. This has the disadvantage that there is a risk of the cap falling off when the cap is removed.

The purpose of this invention is to provide a notched elastic piece in a part of the cylinder of the connector, and to make the connector an integral part that is easy to handle, so that it can be easily and reliably assembled.

To explain this invention based on the drawings, as shown in Fig. 1, the shaft 1 has an opening at its tip, and a threaded part 1A that screws with the base 2 is provided on the outside of the opening. The inner side has an opening hole 1B into which the connector 3 is inserted, and the connector 3 is locked to the rear end of this opening hole 1B, and a front end step 1C having a larger diameter than the tightening ring 4 is formed. Chuck 5 on the back of 1C
springs backward, and locks the spring 6, which has an inner diameter larger than the outer diameter of the tightening ring 4.

In front of the screw of cap 2 is a tightening ring 4 that has moved slightly during knocking.
A small diameter stepped portion 2A is provided to prevent the forward movement of the shaft.

The connector 3, which is locked in the opening hole 1B, has an inner diameter that allows the tightening ring 4 to slide thereon, and an outer diameter that is slightly smaller than the diameter of the opening hole, except for the elastic piece 3A.

On the other hand, an elastic piece 3A is formed on the cylindrical surface of the connector 3 by a U-shaped notch 3B penetrating the inner diameter, and the inner diameter of the front end of this elastic piece 3A is the same as the inner diameter of the cylindrical surface of the connector 3. The outer diameter of the front end is so thick that it slightly protrudes from the outer diameter of the cylindrical surface of the connector 3.

When the connector 3 is press-fitted into the opening hole 1B, the elastic piece 3
The front end of A protrudes inward from the inner diameter of the connector 3, and a tightening ring 4 holding a chuck 5 is locked against the protrusion by overcoming the elastic force of a spring 6.

Next, when assembling such a knock-type mechanical pencil, after attaching the tightening ring 4 to the chuck 5,
By inserting the spring 6 from the head 5A side of the chuck 5 and inserting it from the opening at the tail end of the shaft 1, the chuck 5 and the tightening ring 4 can be seen through the opening.

Then, the connector 3 is press-fitted into the opening hole 1B and is assembled by locking it to the front end step portion 1C of the shaft 1.

Next, to explain another embodiment, FIG. 2 shows a connecting tool 13
By providing a cylindrical outer flange 13C that can be locked in the opening of the shaft 11 on the front end edge of the shaft 11, the formation of the front end stepped portion 1C of the shaft 1 shown in FIG. 1 is eliminated, and the processing of the shaft 11 is simplified. This is what I did.

FIG. 7 shows that a cylindrical inner flange 23D is formed on the front edge of the connector 23 to prevent the tightening ring from moving forward after the tightening ring moves a little in the radial direction during knocking. This eliminates the formation of the small-diameter stepped portion 2A of the cap 2 shown in FIG. 2, thereby increasing the reliability of the centering length of the mechanism.

As mentioned above, compared to conventional parts, the coupling tool of this invention is easier to process and handle, is easy to install, is reliable, and can reduce the variation in centering length, reducing costs. This has many effects such as improving quality.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of the main part showing an embodiment of this invention, Figs. 2 and 3 are longitudinal sectional views of the main part showing other embodiments of this invention, and Fig. 4 is a connector in Fig. 1. FIG. 1.11...Shaft, 1A...Threaded part of shaft 1, 1B...Opening hole of shaft 1, 1C...
Front end step part of shaft 1, 2...cap, 2A...
・Small diameter step part of cap 2, 3, 13.23... Connector, 3A... Elastic piece of connector 3, 3B...
・・Notch part of connecting tool 3, 13C・・・・・Connecting tool 13
Outer flange part, 23D... Inner flange part of coupling tool 23, 4
...Tightening ring, 5...Chuck, 5A
・・・・・・Chuck 5 head, 6 ・・・ Spring.

Claims (1)

[Scope of Claim for Utility Model Registration] 10 A chuck 5 that clamps a core within a shaft to which a cap 2 is screwed.
In a knock-type mechanical pencil configured to hold a lead by the elastic force of a spring 6 by inserting a cylindrical tightening ring 4 into the holder, an elastic piece is formed on the outer periphery of the cylindrical connector 1 or a plurality of cylindrical connectors. , the outer diameter of the front end of the elastic piece slightly protrudes beyond the outer diameter of the cylindrical surface of the connector, and the inner diameter is the same as the inner diameter of the cylindrical surface of the connector, and the connector is locked to the front end step of the shaft. Connector. 2. The coupling device according to claim 1, which is a registered utility model, wherein the coupling device is locked to the aperture edge of the shaft by means of an outer flange portion projecting outward from the coupling device.