JPS5842141Y2 - Knotsuku style pencil - Google Patents

Description

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

Conventional couplings that are inserted from the chuck head include those that insert a C-shaped ring from the side of the chuck, and those that fit two split couplings on a tightening ring. The problem is that the C-ring is small, and the C-ring has to be spread out for insertion, which makes assembly inefficient.In the case of a two-piece connector, it is difficult to assemble with one hand, and there is a risk of it falling off when removing the cap. was.

This invention aims to eliminate all of the above-mentioned disadvantages by providing a radially telescopically deformable hinge in the coupling.

To explain this invention based on the drawings, as shown in Fig. 1, a cap 2 is screwed into a threaded portion 1A at the front end of a shaft cylinder 1, and a fastener remains in front of the thread of the cap 2 after a small movement due to knocking. A locking step portion 2A is provided to prevent the forward movement of the locking step portion 2A.

The front part of the shaft cylinder 1 is provided with an opening hole IB and also constitutes a front stage part 1C of the shaft cylinder 1.

The opening hole 1B is provided with a cutout recess 1D at an arbitrary position as shown in FIG. 3, and a connecting tool 3 as shown in FIG.
When the connector 3 is inserted in a contracted state, the convex part 3B of the hinge part 3A of the connector 3 enters the notch recess 1D, and the rear end 3C of the connector 3 is inserted into the front part 1C of the shaft tube 1. It hits and gets stuck.

On the other hand, the inner diameter of the front section 1C of the shaft cylinder 1 is larger than the outer diameter of the fastener 4, but smaller than the inner diameter of the chuck spring 5.

The connector 3 is configured with a hinge portion 3A that slightly expands and contracts in the radial direction at a facing point that is divided into two equal parts in the axial direction, and a rear end 3C has a hinge portion 3A on the opposite side that is 90° shifted from the hinge portion 3A. A protrusion 3D is provided in the inner diameter direction at the location.
D is configured to have a size that allows the fastener 4 to pass through when the hinge portion 3A is extended, but prevents the fastener 4 from moving backward when the hinge portion 3A is contracted.

To assemble the knock-type mechanical pencil thus configured, after assembling the fastener 4 to the chuck 6, insert the chuck spring 5 from the head side of the chuck 6, and then insert it from the rear end 1E of the barrel 1. Chuck 6 and fastener 4
protrudes from the opening hole 1B of the shaft cylinder 1.

Then, when the extended connecting tool 3 is passed through the fastener 4 and the connecting tool 3 is compressed so as to wrap around the fastening tool 4 and passed through the opening hole 1B, the elasticity of the chuck spring 5 causes the front part 1C of the shaft cylinder 1 to to lock.

FIG. 4 shows another embodiment in which the surface of the cylindrical portion of the connector 13 is provided with a convex portion 13A that is press-fitted into the opening hole, in order to more securely attach the connector to the shaft cylinder.

In the embodiment shown in FIG. 5, a hook-shaped drop-in piece 23A tilted backward is formed at the rear end of the connector 23.
By inserting it through the opening hole 1B of the shaft cylinder 1, the inclined surface
The front part IC of the shaft cylinder 1 engages with the recess 23B formed by the key-shaped drop-in piece 23A by passing over the front part 1C of the shaft cylinder 1.

As mentioned above, the parts of the connector of this invention are larger than conventional parts, and it can be installed reliably with a simple one-handed operation, which has a great effect on reducing costs and improving quality. It is.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the knock-type mechanical pencil of this invention. FIG. 2 is a perspective view of the connector of this invention. FIG. 3 is a view taken along the line AA in FIG. 1 of this invention. FIG. 4 is a perspective view of a connector in another embodiment. FIG. 5 is a longitudinal sectional view of a connector in another embodiment. FIG. 6 is a longitudinal cross-sectional view of the main part showing the state in which the connector shown in FIG. 5 is attached to the shaft cylinder. 1...Axle tube, 1A...Threaded part of axle tube 1, 1B...Open hole of axle tube 1, 1C...
Front part of shaft cylinder 1, 1D...notch recess of shaft cylinder 1,
1E... Rear end of shaft cylinder 1, 2... Cap, 2A... Locking stepped portion of cap 2, 3, 13° 23
...... Connecting tool, 3A... Hinge part of the connecting tool 3, 3B... Convex part of the connecting tool 3, 3C...
... Rear end of coupling tool 3, 3D...Protrusion of coupling tool 3, 4... Fastener, 5... Chuck spring, 6... Chuck .

Claims (1)

[Scope of utility model registration request] 1. A cylindrical connector provided with one or more telescoping hinges in the axial direction has a protrusion extending in the inner diameter direction, and the connector is inserted into the axial cylinder opening hole after passing the fastener. A knock-type mechanical pencil characterized by a structure in which the fastener is locked when the mechanical pencil is pressed. 2. The knock-type mechanical pencil according to claim 1, which is provided with one or more press-fit convex portions on the outer periphery of the connector. 3. A knock-type mechanical pencil in which a key-shaped drop piece is formed at the rear end of the connection to one or more barrel front end steps.