JPS641533Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a fastening device for mechanical parts of a record player or the like.

Conventional Structure and Problems Conventionally, there have been various methods for attaching mechanical parts of record players and the like. Recently, there has been a tendency to use resin molded products to attach parts. A typical method will be described below with reference to FIGS. 1 and 2. The stop shaft 1 has a recess 1a extending over the entire length in the circumferential direction at the tip, and a flange 1b at the rear end.
Each is provided. Furthermore, on the inner circumferential surface of the boss 2 through which the stop shaft 1 is inserted, a plurality of circumferential pawls 2 divided by grooves 2a along the stop shaft 1 from the insertion side of the stop shaft 1 are molded integrally with the boss 2. and claw 2b
A protrusion 2c that fits into the recess 1a is provided at the tip. When the mechanical part 3 is fitted onto the outer peripheral surface of the boss 2 and the stop shaft 1 is inserted into the center of the boss 2 from the direction of arrow A, the pawls 2b are pushed apart in the direction of arrow B by the stop shaft 1, but the boss 2 Since it is a resin molded product, the pawl 2b returns to its original state when the recess 1a and the protrusion 2c meet due to the elasticity of the resin, and the stop shaft 1 and boss 2 fit the mechanism component 3 to the outer periphery of the boss 2. They are engaged with each other in a state in which the two parts are aligned and positioned by the flange part 1b.

However, in such a conventional configuration, when removing the mechanism part 3, when opening the pawl 2b in the direction of arrow B and pulling out the stop shaft 1 from the boss 2, the fitting part between the stop shaft 1 and the boss 2 is removed from the boss 2. It was very difficult because it was inside. Furthermore, if you try to remove the stop shaft 1 forcibly, the claw 2b and the stop shaft 1
This was a problem as it could sometimes damage the.

Purpose of the invention The present invention solves the above-mentioned conventional drawbacks, and aims to provide a fastening device for mechanical parts that can easily engage and disengage a stop shaft and a boss.

Composition of the Invention In order to achieve the above object, the mechanical component fastening device of the present invention includes a mechanical component rotatably fitted on the outer peripheral surface of a boss, and a mechanical component that is inserted through the center of the boss and formed at the rear end. a stop shaft that positions the mechanical component with respect to the boss by a flange portion and has a recess formed on the outer circumferential surface; a claw extending along the stop shaft from the insertion side of the stop shaft and having a protrusion that fits into the recess at a position corresponding to the recess of the stop shaft; The locking shaft is configured to include a protruding portion integrally provided to protrude beyond the tip portion of the stop shaft.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 3 is a cross-sectional view of the fastening device in a state in which mechanical parts are fastened, and FIG. 4 is an exploded perspective view of the same. Components that are the same as those shown in FIGS. 1 and 2 are designated by the same reference numerals. The explanation will be omitted. In FIGS. 3 and 4, 2d is a protrusion,
This protruding portion 2d integrally projects from the tip of each pawl 2b of the boss 2 along the extending direction of the pawl along the stop shaft 1, and its tip protrudes further ahead of the tip position of the stop shaft 1. ing.

When removing mechanism part 3, mark boss 2 with arrow C.
By inserting the jig 4 from the direction and pushing the protrusion 2d open in the direction of arrow B, the engagement between the recess 1a of the stop shaft 1 and the protrusion 2c of the pawl 2b can be disengaged. It can be easily removed from the boss 2. Note that since the pawl 2b is integrally molded with the boss 2 from a resin material, after the stop shaft 1 is removed, the pawl 2b returns to its original state due to the elasticity of the resin. As the jig 4, a plus dryer or the like can also be used.

In the above embodiment, an example was explained in which the claw 2b was molded integrally with the boss 2 from a resin material, but the claw 2b only needs to have appropriate elasticity and strength, and is not necessarily required. It does not have to be formed integrally with the boss 2.

Effects of the Invention As explained above, according to the present invention, it is possible to greatly improve the workability when installing and removing mechanical parts, and it is also possible to solve problems such as damage caused by work that applies excessive force.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional device, FIG. 2 is a perspective view thereof, FIG. 3 is a sectional view of a fastening device for mechanical parts according to an embodiment of the present invention, and FIG. 4 is a perspective view thereof. 1...stop shaft, 1a...recess, 1b...flange,
2...Boss, 2b...Claw, 2c...Protrusion, 2d
...Protrusion, 3...mechanical part.

Claims (1)

[Scope of utility model registration request] A mechanical component is rotatably fitted to the outer circumferential surface of the boss, and a flange inserted through the center of the boss and formed at the rear end positions the mechanical component relative to the boss, and a recess is formed in the outer circumferential surface. a formed stop shaft, a plurality of bosses having elastic force extending along the stop shaft from the insertion side of the stop shaft in the circumferential direction of the inner peripheral surface of the boss, and a recessed portion of the stop shaft; a claw having a protrusion that fits into the recess at a position corresponding to the recess, and a protrusion integrally provided from the tip of each of these claws to protrude beyond the tip of the stop shaft along the direction in which the claw extends. Mechanical parts fastening device equipped with