JPS6313510Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of the external operation part of a watch case.

The structure of the conventional external operating section includes, for example, a non-circular head 3a of the external operating member 3 and a non-circular counterbore of the body 1, as shown in the partial cross-sectional view of FIG. 1 and the perspective view of FIG. The portions 1a are loosely interlocked with each other with a slight gap, so that the phases of the respective non-circular shapes are matched. For this reason, there is a high demand for ensuring the accuracy of the counterbore, which naturally places strong restrictions on the processing method.

For this reason, the degree of freedom in designing the entire watch case was severely restricted, necessitating manufacturing methods that required many man-hours and costs, and created conditions that inhibited the creation of thinner watch cases.

In other words, if the shape of the counterbore part of the body is made too large than the head of the operating member, as shown in Fig. 3,
When assembled, phase shifts in the rotational direction of each shape can easily occur, and especially when there are multiple operating members, discrete phase shifts occur in each operating member, resulting in a very poor appearance. Become.

In addition, if the gap between the head of the operating member and the counterbore is closed, when pressing the external operating member, this member will come into contact with the counterbore, making mutual interference more likely to occur. A manufacturing process that specifically ensures hole position accuracy is required.

For this reason, it is necessary to machine a counterbore part concentrically with the center of the through hole of the barrel through which the external operating member is inserted.
Unlike the conventional procedure in which multiple counterbore portions are simultaneously press-formed, the processing load increases.

Therefore, various types of processing such as end milling and chamfering are required for each external operation section. Furthermore, when the body becomes thin and the remaining wall thickness 1b of the counterbore cannot be secured, the head 3a of the external operating member 3, the pipe 2, etc. are exposed on the back side of the body, which is a big problem in terms of appearance.

The present invention has been made to eliminate the above-mentioned drawbacks, and includes a support piece that guides the non-circular head of the external operating member and covers the shaft and pipe between the external operating member and the body. An embodiment will be described with reference to FIGS. 4 and 5.

FIG. 4 is a partial sectional view of the external operation section, and FIG. 5 is an exploded perspective view based on FIG. 4.

The body 5 has a counterbore 5 on the side that is open downward.
a, and a through hole 5b is formed in the center of the counterbore portion 5a. The external operating member 3 has a non-circular head 3a that conforms to the rectangular shape of the counterbore 5a.
The shaft portion 3b is connected to the pipe 2 via the O-ring 6.
It is arranged so that it can slide. Through hole 5b of body 5
The pipe 2 to be fixed has an outer collar 2a, and a support piece 4 is held between the outer collar and the side wall of the body 5. This support piece 4 consists of a guide portion 4a provided with a hole 4c for attachment to the pipe 2, and a support portion 4b extending approximately perpendicular to this portion 4a and in contact with the head portion 3a of the external operating member 3. Support part 4
The non-circular head 3a rotates to regulate the shape and phase shift of the counterbore portion, and at the same time serves to cover and hide the shaft portion 3b of the external operating member 3.

The support piece 4 is fixed by the pipe 2, but if the part 4a of the support piece 4 is the same as the profile of the counterbore 5a, it will not rotate around the pipe 2 and will be fixed in place. can do.

Because of the above configuration, the counterbore part of the body is
It becomes possible to set the position independently of the phase of the external operation member, and it becomes possible to apply manufacturing methods such as pressing in accordance with the manufacturing process of the shell, which is advantageous in terms of mass production and cost. It is now possible to have an angular shape, which has the effect of increasing the degree of freedom in design and promoting thinness.

[Brief explanation of drawings]

1, 2, and 3 are a cross-sectional view, a perspective view, and a side view showing the structure of a conventional external operation section,
FIGS. 4 and 5 show an embodiment of the present invention, and are a sectional view and an exploded perspective view of the structure of the external operating part. DESCRIPTION OF SYMBOLS 1...Body, 1a...Spot face, 1b...Wall surface remaining thickness, 2...Pipe, 2a...Outer collar, 3...External operating member, 3a...Head, 3b...Shaft, 4...
...Support piece, 4a...Guide part, 4b...Support part,
4c... hole, 5... body, 5a... counterbore, 5b
...Through hole, 6...O ring.

Claims (1)

[Scope of utility model registration request] In the structure of a watch case in which an external operating member having a non-circular head is passed through a through hole in the body through a pipe, and the head is loosely engaged with a counterbore in the body, the pipe and the body are connected together. 1. A structure for an external operation part of a watch case, characterized in that a support piece is sandwiched between the support piece and a side wall part of the watch case, and the support piece is provided with a support part that comes into contact with the head of the external operation member.