JPS596468Y2 - Side pipe structure - Google Patents

Description

[Detailed description of the invention] This invention relates to the structure of the side pipe of a watch case, and by reducing the diameter of the winding stem hole and the fitting length of the side pipe, it is possible to make the watch case thinner. , the purpose is to realize miniaturization.

Conventionally, the structure of the side pipe of a watch case is as shown in Fig. 1, in which a side pipe 3 is inserted into the winding stem hole 2 of the body 1 of the watch case.
The common method was to apply a light compress to the mating part and then seal the fitting part with an adhesive.

However, as movements have become thinner in recent years, there has been a need to make watch cases thinner as well, and smaller designs have been desired.With conventional structures, it is difficult to make them thinner or smaller. This is because when making watch cases thinner, the apparent body thickness T
1 is most effective, but the upper half of the body 1 is limited by the engagement length of the packing 5 that waterproofly fixes the glass edge 4, and the lower half of the body 1 is limited by the engagement length of the back cover 6. It is limited by the length and O-ring.

Furthermore, since the winding stem hole 2 is determined by the inner diameter of the side pipe 3 and the wall thickness of the side pipe 3, there is a limit to making it even smaller.

Further, in order to reduce the size of a watch case, it is sufficient to reduce the outer diameter D of the body 1, but this is limited by the size of the movement 7 and the fitting length W of the side pipe 3.

This invention eliminates the above drawbacks, and by joining the side pipe on the outermost circumference of the winding stem hole, the diameter of the winding stem hole can be reduced and the fitting length of the side pipe can be reduced. The aim is to make the watch case thinner and smaller.

The present invention will be explained below based on examples.

Reference numeral 1 in FIG. 2 is a barrel, which has a winding stem hole 2 and a counterbore 8.

The hole diameter d1φ of the winding stem hole 2 should have an inner diameter that allows the winding stem to pass through, and the counterbore diameter d2φ of the counterbore 8 is the diameter d2φ of the side pipe 3.
The outer diameter of the side pipe 3 is equal to or slightly larger than the outer diameter of the pipe 1, and serves as a guide when joining the side pipe 3 to the body 1.

The side pipe 3 has a flange 10 on the inside of one end, and a conical slope chamfer 9 on the outside.The flange 10 allows the inner end of the side pipe 3 to have a minimum circular diameter d3φ and a stepped inner diameter d4φ.
This is clearly expressed.

The outermost inner peripheral end 11 of the winding stem hole 2 and the chamfer 9 of the side pipe 3 are joined to the shell 1 and the side pipe 3 by seal welding, and the outermost inner peripheral end 11 of the winding stem hole 2 is connected to the chamfer 9 of the side pipe 3 by seal welding. side pipe 3
Since the chamfer 9 of the shell 1 contacts uniformly without any corners, the difference in heat capacity between the shell 1 and the side pipe 3 is covered during welding, and the chamfer 9 of the shell 1
It is possible to preferentially melt the outermost inner periphery 11 of the welding material, providing welding conditions with good heat balance, not only providing strong and stable fixing force, but also maintaining airtightness with the outside air.

Furthermore, since the chamfer 9 has a conical slope, the surface of the chamfer 9 that connects with the outermost inner circumferential end 11 can be widened.

The minimum inner diameter d3φ of the side pipe 3 is only required to be slightly larger than the maximum diameter of the winding stem, and the stepped inner diameter d4φ is for pressurizing the difference in level from the minimum inner diameter d3φ during welding.

The fitting length W of the side pipe 3 is for guiding the counterbore diameter d2φ and the outer diameter of the side pipe 3 to be concentric, and for covering welding burns.

As described above, the present invention has a structure in which the side pipe is joined to the outermost part of the winding stem hole in the body, so that the side pipe and the winding stem hole are arranged in parallel.

As a result, the case is definitely thinner and more compact than before, and there is more flexibility in the design balance between the glass edge and the case, making it possible to provide a watch case that looks good.

Furthermore, since the present invention melts and fixes the slope of the side pipe to the outermost inner peripheral end of the winding stem hole, the heat balance between the body and the side pipe is improved, and the fixing force is improved and stabilized.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the structure of a conventional side pipe section, and FIG. 2 is a sectional view of the side pipe section showing an embodiment of the present invention. 1...Body, 2...Hole for winding stem, 3...
...Side pipe, 8...Counterbore, 9...
・Chamfer, 10...Brim, 11...
Outermost inner peripheral end, d1φ... Hole diameter, d2φ...
...Counterbore diameter, d3φ...Minimum inner diameter, d4φ
...Step inner diameter, W...Mating length.

Claims (2)

[Scope of utility model registration request] (1) In the side pipe structure that is attached to the watch case, a chamfer is provided on the outside of one end of the side pipe, and the chamfered part of the side pipe is joined to the outermost circumferential end of the winding stem hole in the body. The structure of the side pipe is characterized by its structure. (2) The structure of the side pipe according to claim 1, wherein the chamfered portion is shaped like a conical slope.