JPS6231899Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a structure for fixing a glass edge in a watch case.

As a means for fixing the glass edge to the body, there is a method of fitting and fixing the glass edge to the body through synthetic resin packing. Fig. 1 is a cross-sectional view showing a general glass edge fixing structure in a watch case to explain the conventional structure and the present invention. A rising part 1a that compresses the inner periphery of the synthetic resin packing 2 for use, a receiving surface 1b that contacts the upper surface 3a of the body 3 on the upper part of this rising part 1a, and a lower part of the rising part 1a that makes it easier to push the glass edge 1. A guide slope 1c is formed for this purpose. The body 3 includes a receiving surface 3b that receives the lower surface of the synthetic resin packing 2 for fixing the glass edge, an inner circumferential wall surface 3c that compresses the outer periphery of the synthetic resin packing 2, and this inner circumferential wall surface 3.
An annular groove 3d is formed at the bottom of c. The synthetic resin packing 2 has an L-shaped cross section, has an inner diameter slightly smaller than the outer diameter of the rising portion 1a of the glass edge 1, and has an outer diameter slightly smaller than the outer diameter of the rising portion 1a of the glass edge 1.
c, and has a guide slope 2a on the upper part of the inner periphery to facilitate assembly of the glass edge 1.

Therefore, in order to fix the glass edge 1 to the barrel 3, first the synthetic resin packing 2 is placed on the receiving surface 3b of the barrel 3 with the guide slope 2a facing upward. As a result, the synthetic resin packing 2 comes into close contact with the inner circumferential wall surface 3c. Next, the glass edge 1 is press-fitted into the inner periphery of the synthetic resin packing 2 with its guide slope 1c facing down. As a result, the upper half of the synthetic resin packing 2 is compressed and deformed between the rising part 1a of the glass edge 1 and the inner circumferential wall surface 3c of the body 3, and is strongly brought into close contact with the surfaces of the rising part 1a and the inner circumferential wall surface 3c, making it waterproof. and produces a fixing force. Further, the lower half of the synthetic resin packing 2 is partially deformed by the press-fitting of the glass edge 1 and bites into the corner of the annular groove 3d and the inner circumferential wall surface 3c. Therefore, the synthetic resin packing 2 maintains waterproofness in the upper half and fixing force of the glass edge 1 and the body 3, and
The fixing force is further improved in the lower half. Furthermore, by deforming the lower half into the annular groove 3d, the synthetic resin packing 2 is fixed to the body 3 even after the glass edge 1 is removed; Synthetic resin packing 2
The glass edge 1 is not scattered, and even when the glass edge 1 is fixed to the body 3 again, it is sufficient to simply press and insert the glass edge 1. In such a watch case,
Roughening the surface of the rising portion 1a increases the frictional force between the glass edge 1 and the synthetic resin packing 2, which improves the fixing force of the glass edge 1, but on the other hand, the synthetic resin packing 2 is dragged downward when the glass edge 1 is press-fitted. A phenomenon occurs. In this case, the synthetic resin packing 2 is not properly compressed, and the fixing force and waterproofness are adversely reduced. Therefore, glass edge 1
At the same time as increasing the fixing force of the synthetic resin packing 2
Eliminating the dragging of the glass edge was an important issue for the fixed structure of the glass edge. The phenomenon of dragging of the synthetic resin packing 2 is often observed particularly when the synthetic resin packing 2 has a non-circular profile, that is, a so-called irregular structure. To explain with reference to the drawings, in Fig. 2, synthetic resin packing 2
Angle 2b with a large curvature is difficult to be dragged,
It is known from experience that the side portion 2c with a small curvature is easily dragged.

This idea was developed in view of the above facts.
The object of this invention is to improve the ease of assembling and fixing force of the glass edge in a structure in which the glass edge is fixed to the body via synthetic resin packing.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 3 is a perspective view of a glass edge showing an embodiment of the present invention, in which the profile of the rising portion 1a of the glass edge 1 is irregularly shaped, and the profile of the side portion 1d with a small curvature is
has a relatively slippery surface close to a mirror surface, and the corner portion 1e with a large curvature is finished with a rough surface coated with paper. Synthetic resin packing 2 and body 3
The structure is similar to the conventional structure.

With the above configuration, the side portion 1 of the rising portion 1a
Since d is a mirror-like and relatively slippery surface, when the glass edge 1 is press-fitted into the inner periphery of the synthetic resin packing 2, the side 2c of the synthetic resin packing 2 will not be dragged, and the corners of the rising portion 1a will not be dragged. The fixing force of the glass edge 1 is improved by the frictional force due to the rough surface of the portion 1e, and the ease of assembling the glass edge and the fixing force can be improved all at once. Note that the corner portion 1e of the glass edge 1 is a portion that is less likely to deform its profile in terms of strength than the side portion 1d, and even if only this portion is roughened, the fixing force will be as strong as when the rising portion 1a is roughened all around. is obtained. Further, in the embodiment of the present invention, the angle 1e of the glass edge 1 is roughened with paper, but it is naturally possible to roughen the angle 1e by forming a V-groove with a cutting tool. Furthermore, this structure is not limited to the relationship between the glass edge and the body, but can also be applied to fixing parts such as the glass and the glass edge, the glass and the body, and the body and the back cover.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing a typical glass edge fixing structure for watch cases, illustrating the conventional and the present invention, Fig. 2 is a perspective view of the synthetic resin packing in Fig. 1, and Fig. 3 is FIG. 2 is a perspective view of a glass rim showing an embodiment of the present invention. 1...Glass edge, 1a...Rising part, 1b...
...Receiving surface, 1c...Guiding slope, 1d...Side part, 1e
... Corner part, 2 ... Synthetic resin packing, 2a ...
Guide slope, 2b...corner, 2c...side, 3...
Body, 3a...upper surface, 3b...receiving surface, 3c...inner peripheral wall surface, 3d...annular groove.

Claims (1)

[Scope of utility model registration request] In a structure in which the glass edge 1 is fitted and fixed to the body 3 of the watch case via the synthetic resin packing 2, the side 1d of the rising portion 1a, which is the fitting surface with the synthetic resin packing 2 of the glass edge 1, is smoothed. On the side,
A glass edge fixing structure for a watch case, characterized in that the corner part 1e is formed into a rough surface by using paper weight, V-grooving of a cutting tool, etc.