JPH0132262Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a push button structure particularly suitable for use in wristwatches and other precision instruments.

[Conventional technology]

Conventionally, when the shaft portion 1 and the cap 2 of a push button are integrally molded, it is quite difficult to make the cap into a different shape due to lathing. Therefore, in order to make the cap 2 into a different shape, as shown in FIG.
The push button shaft 1 is inserted through the outer end 3a of the through hole of the watch case 3, and the retaining ring 4 is engaged with the groove 1a of the shaft 1 at the inner end 3b of the through hole.

Note that FIG. 1b is a side view of the cap 2 seen from the direction of arrow A in FIG. 1a.

[The problem that the idea aims to solve]

However, in this push button structure, since the shaft portion 1 and the cap 2 are connected by adhesives, screws, etc., the load required for processing and assembly is large. In addition, the push button is prevented from falling out by a locking ring 4, so
The burden of assembling this retaining ring 4 was also large.

The present invention solves the above problems, allows the irregularly shaped cap to be easily attached to the shaft, greatly reduces the assembly and processing load of the push button, and has a return mechanism for the push button. It provides a push button structure.

[Means to solve the problem]

The structure of the present invention is a push button structure composed of a shaft and a cap which are separate parts, wherein the shaft has a retaining part at the inner end and a protrusion and a groove near the outer end, and the cap has the following features: , a collar part made of an elastic body and having a concave part at the inner end and covering a part of the concave part from the outer periphery toward the center;
A plurality of elastic pieces are formed on the outer periphery of the inner end, and the shaft is inserted through the inner end of the through hole of the watch case, and the elastic pieces are inserted into the protrusions and grooves of the shaft that protrude to the outside of the watch case. The concave portion and the flange portion of the cap are engaged with each other, and the push button can be returned to its original position by means of the elastic piece.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 2a is a sectional view of an embodiment of the push button structure of the present invention, and FIG. 2b is a perspective view schematically showing the cap 2 of FIG. 2a.

The push button of the present invention is composed of a shaft portion 1 and a cap 2. This shaft portion 1 has a retaining portion 1e at the inner end, a protrusion 1b and a groove 1c near the outer end.
A waterproof groove 1d is formed approximately in the middle of the groove. On the other hand, cap 2 is made of an elastic material,
The inner end is a concave part 2c, and the concave part 2c extends from the outer periphery toward the center.
A flange portion 2a covering a portion of the flange portion 2a and two elastic pieces 2b are formed at 180° intervals on the outer periphery of the inner end.

Next, a method of engaging the cap 2 to the shaft portion 1 will be explained. FIGS. 3a and 3b are cross-sectional views showing the state in which the cap 2 is engaged with the shaft portion 1. FIG. The shaft portion 1 with the waterproof ring 5 inserted into the waterproof groove 1d is inserted from the inner end 3b side of the through hole of the watch case 3, and the shaft portion 1 is pressed against the watch case 3 using a holding plate 6 as a jig. The collar portion 2a is pressed against the protrusion 1b of the shaft portion 1. Next, as shown in Fig. 3b, when the cap 2 is strongly pushed in the direction of arrow C, the flange 2a of the cap 2 will open.
spreads out. Furthermore, by pushing the cap 2, the protrusion 1 of the shaft portion 1 is inserted into the recess 2c of the cap 2.
When b is inserted, the flange 2a of the cap 2 is connected to the shaft 1.
(Fig. 2a). In this state, the shaft portion 1 is fixed to the case 3 by the retaining protrusion 1e and the cap 2. The cap 2 is preferably made of an elastic material such as a soft synthetic resin that can be easily shaped into different shapes and has high elasticity. Further, the tip of the elastic piece 2b of the cap 2 touches the side wall of the watch case 3, constantly pushing the push button outward of the watch case 3. As a result, after pushing the cap 2 of the push button in the direction of arrow D, the push button can be returned in the direction of arrow E. (Fig. 2a) In the embodiment of the present invention, the shaft portion 1 of the push button was inserted into the through hole of the watch case 3.
It goes without saying that the push button structure of the present invention can also be used in a case in which a pipe is fixed to a through hole of the watch case 3.

[Effect of idea]

As described above, according to the present invention, the concave part and the collar part of the cap having a plurality of elastic pieces at the inner end are respectively engaged with the protrusion and groove of the shaft part having the retaining part at the inner end. This makes it possible to easily attach an irregularly shaped cap to the shaft, eliminate the need for a retaining ring, and reduce the assembly and processing load of the push button.

In addition, after performing a push button operation (pushing operation), the push button can be returned to its original position by the elastic piece of the push button.
It has a new push button structure that has never been seen before.

[Brief explanation of the drawing]

Figure 1 a, b is a sectional view showing the conventional push button structure and a side view of the cap, Figure 2 a, b
3A and 3B are sectional views of a push button structure and a perspective view of a cap according to an embodiment of the present invention, and FIGS. 3A and 3B are sectional views showing a method of engaging the cap. 1...Shaft portion, 1b...Protrusion, 1c...Groove, 1d
...Waterproof groove, 1e... Retaining part, 2... Cap, 2a... Brim part, 2b... Elastic piece, 2c...
Recessed portion, 3...Watch case, 3b...Inner end of through hole,
5... Waterproof ring, 6... Presser plate.

Claims (1)

[Claims for Utility Model Registration] In a push button structure composed of a shaft and a cap which are separate bodies, the shaft has a retaining portion at its inner end and a protrusion and a groove near its outer end; The cap is made of an elastic material, and has a concave portion at its inner end, a collar portion covering a portion of the concave portion from the outer periphery toward the center, and a plurality of elastic pieces formed on the outer periphery of the inner end, so that the cap can pass through the watch case. The shaft is inserted through the inner end of the hole, and the recess and collar of the cap are respectively engaged with the protrusions and grooves of the shaft that protrude to the outside of the watch case, so that the push button can be returned to its original position by means of the elastic piece. A push-button structure characterized by a similar shape.