JPS5922918B2 - Structure of the glass part of the watch case - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a glass portion of a watch case, and more particularly to a structure in which an ultra-thin watch glass is fixed to a glass fixing member such as a glass edge or a case through a synthetic resin ring.

Generally, structures are known in which a watch glass is fixed to a glass fixing member such as a glass rim or body via a synthetic resin ring made of Teflon, polycarbonate, nylon, etc., and a typical structure is shown in Figure 1. A watch glass 2 is press-fitted into a stepped portion of the body 40 via a Teflon resin ring 3.

This structure has been manufactured and sold by the applicant for a long time, and its structure is characterized by the plasticity of Teflon resin,
Due to its excellent heat resistance and chemical resistance, it is able to maintain extremely stable waterproofness and fixing power, and combined with the simplified number of parts and structure, it has become the mainstream of today's glass fixing structures. It is.

In the case of the structure described above, empirically, it is said that the height of the Teflon resin ring needs to be at least L2mrn in order to maintain the fixing force between the glass and the body and the waterproofness. It was impossible to commercialize the product with the following values.

In addition, in reality, the thickness of the glass is 1, since an upper slope 25 is adopted on the outer periphery for aesthetic reasons and to prevent glass breakage.
．． The limit is 3 minutes.

However, today, the thickness of mechanical movements is 2~
It is 37n7ft, and the electronic movement is also 3 to 41r.
With the introduction of L1n, it became necessary to make watch cases as thin and compact as possible.

The structure of the present invention was invented in view of the above-mentioned needs and with the aim of making watch cases as thin as possible. This is an epoch-making device that can be fixed to a glass fixing member such as a barrel.

In other words, the conventional synthetic resin ring is placed under pressure between the glass and the body, and the reaction force maintains the fixing force and waterproofness between the glass and the synthetic resin ring, and between the synthetic resin ring and the body. When this synthetic resin ring is compressed in the radial direction, it deforms elastically and plastically toward the upper end of the synthetic resin ring, and as a result, the reaction force applied to the shell and glass decreases by that amount. Therefore, it was not possible to obtain strong fixing force and waterproofness.

As a result of keenly pursuing the above-mentioned problems, the present inventors discovered the following points.

■ Waterproofness between the glass and the synthetic resin ring can be guaranteed if there is even a slight straight outer diameter surface on the outer periphery of the glass.

■ When the synthetic resin ring is compressed in volume, it provides greater waterproofness and fixing force than expected to the outer diameter surface of the glass and the inner circumferential surface of the body.

■ When the volume of the synthetic resin ring is compressed, a part of it is extruded through a small gap and placed on the upper slope of the glass, greatly improving the glass fixing force.

The inventors of the present invention have completed the present invention as a result of numerous efforts to solve the above-mentioned problems.The present invention is characterized by a circumferential groove having a flange at the upper part and a glass receiving surface at the lower part. a glass fixing member provided on the inside, a lower surface that abuts the glass receiving surface of the circumferential groove, and a height from the lower surface that is lower than a height from the glass receiving surface of the circumferential groove at the upper inner surface. a rising height portion set as such, an outer diameter surface whose outer diameter is set to be slightly smaller than the inner diameter of the boxwood portion, and a guide provided at the bottom of the outer diameter surface. a watch glass having a slope, an inner surface compressed by an outer diameter surface of the watch glass, and a watch glass that is placed under pressure between the circumferential groove and the watch glass, and the watch glass is placed above the glass fixing member. a synthetic resin ring having an extruded portion that is press-fitted into the inner surface to be extruded from between the upward surface of the circumferential groove and the rising height portion of the watch glass, and suppresses and fixes the watch glass from above; To provide a small and thin watch case, which has a structure of the glass part of the watch case, which is characterized by a structure in which an ultra-thin watch glass can be fixed to the glass edge, body, etc.

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

2 and 3 show an embodiment according to the present invention, in which 1 is a glass edge as a glass fixing member, 2 is a watch glass, 3 is a synthetic resin ring, and 4 is a body.

A circumferential groove 11 for attaching the synthetic resin ring 3 is formed on the inner circumferential surface of the glass edge 1, and a flange portion 12 for compressing the synthetic resin ring 3 in terms of volume is formed above the circumferential groove 11. A glass receiving surface 13 for receiving the lower surface of the glass 2 is formed at the lower part.

Furthermore, a slope 14 is formed on the upper surface of the flange portion 12 to facilitate the installation of the glass 2.

The groove depth Ll of the circumferential groove 11 is such that the compression allowance portion of the synthetic resin ring 3 protrudes inward, and the inner diameter dimension D1 of the flange portion 12 is set so that the inner diameter dimension D1 of the flange portion 12 is set so that the groove depth Ll is such that the compression allowance portion of the synthetic resin ring 3 protrudes inward. The diameter is slightly larger than the outer diameter dimension D2 of No. 2.

On the other hand, a substantially vertical outer diameter surface 21 is formed on the outer periphery of the glass 2, and a guide slope 22 that serves as a guide when press-fitting into the synthetic resin ring 3 is formed at the lower part thereof.

The outer diameter dimension D2 of the outer diameter surface 21 is slightly smaller in diameter than the flange portion 12 of the glass edge 1, and is formed so as to compress the compression margin portion of the synthetic resin ring 3.

The rising height portion 23 at the intersection of the outer diameter surface 21 and the upper slope 25 is formed such that the distance H2 from it to the lower surface 24 of the glass 2 is lower than the upward surface 15 of the circumferential groove 11. A gap C is provided between the upper surface 15 and the upper surface 15.

The intersection point of the guide slope 22 with the lower surface 24 of the glass is located inward from the inner surface 31 of the synthetic resin ring 3, which prevents the synthetic resin ring 3 from being pulled in when the glass is press-fitted and also reduces the press-fitting resistance of the glass 2. is being eased.

Incidentally, the upper slope 25 of the glass 2 is necessary for aesthetic reasons and also has the function of preventing the glass 20 from chipping, but for the purposes of the present invention, as shown in FIG. They may be connected to the upper surface 26.

As shown in FIG. 5A, the synthetic resin ring 3 has a cross-sectional shape before assembly, and has an inner surface 31 that is compressed by the outer diameter surface 21 of the glass 2, and an outer surface 31 that is compressed by the outer diameter surface 21 of the glass 2. An outer surface 32 is formed in contact with the bottom of the circumferential groove 11 of the glass edge 1.

The height of this synthetic resin ring 3 is the same as or slightly lower than the height of the circumferential groove 11.

As shown in FIG. It is important that the synthetic resin ring 3 always has an inner surface 31 compressed by the outer diameter surface 21 of the synthetic resin ring 3 .

The synthetic resin ring 3 is strongly compressed within the space formed by the circumferential groove 11, the outer diameter surface 21, and the guide slope 22, and due to the plasticity of this synthetic resin, it infiltrates the surface of the space without any corners, and the member It maintains the waterproofness between and the fixing force of the glass 2.

Further, a part of the synthetic resin ring 3 is extruded from the gap C by strong volume compression and is formed as an extruded part 34,
The upper slope 25 of the glass 2 is pressed down.

Next, as for assembly, as shown in FIG. 3, the synthetic resin ring 3 is placed in the circumferential groove 11 of the glass edge 1,
is placed in a position using the flange 12 and slope 14 as guides, and the glass 2 is pushed down using a jig.

At this time, the glass 2 is pushed in from the correct position by the flange 12 and evenly presses the inner surface 31 of the synthetic resin ring 3.

Finally, as shown in Fig. 2, the synthetic resin ring 3
A part of the gap C is also pushed out, and an extruded portion 34 is formed on the upper slope 25, thereby greatly improving the fixing force of the glass 2.

Next, the results of an experiment on the fixing force and waterproofness of the watch glass conducted based on Fig. 2 are shown below, and as a reference, as shown in Fig. 6, the synthetic resin ring 3 Experimental results for a structure in which Glass 2 was press-fitted are also described.

The compression rates of the glass, synthetic resin (Teflon resin) rings, and rings are the same in FIGS. 2 to 6, and the waterproofing experiment was conducted at 4 atmospheres for 10 minutes.

As is clear from the above experimental results, the structure of the present invention is
It has much better waterproofness and fixing power than conventional ones, and based on the three facts mentioned above and further experiments, it has become possible to reduce the thickness of the glass to 0.4 mm. Ta.

This is especially true in the rainy season, considering that conventional structures could only use glass up to 1.2 mm thick.

In addition to the Teflon resin used in the previous experiment, the material for the synthetic resin ring is a material with appropriate plasticity,
For example, nylon 11, nylon 12, Tefzel, Pelprene, Aflon, polyethylene, polycarbonate, etc. can be considered, but among these, Teflon resin is most suitable because of its extremely high plasticity.

In addition to the structure (Fig. 2) in which a circumferential groove is provided on the edge of the glass and the glass is fixed there, the present invention also provides a structure in which a circumferential groove is provided in the body as a glass fixing member and the glass is fixed thereto. (Figure 4) is also naturally possible.

Furthermore, it is naturally possible to adopt the structure of the present invention when attaching a glass edge, a back cover, a battery cover, etc. to other exterior parts instead of glass.

As described above, the present invention strongly compresses a synthetic resin ring between the glass and the circumferential groove of a glass fixing member such as a glass edge or a body, and partially compresses the synthetic resin ring between the glass and the circumferential groove. Since the structure is such that the extruded part is formed by extruding from the gap,
The fixing force of the glass and the waterproofness between the glass and the glass fixing member can be greatly improved.

Therefore, the synthetic resin ring in the conventional structure is simply compressed in the radial direction, and the reaction force is deformed upward and dissipated. This is completely different from those in which the height of the ring is made unnecessarily large.The synthetic resin ring is strongly compressed within the circumferential groove, and the deformed portion caused by this compression is squeezed out from the gap. Because it is extruded on the slope, even with the use of an extremely small synthetic resin ring and thin glass, it has greater fixing strength and waterproofness than conventional ones, and is able to fully meet the current demands for thin and small watch cases. Some 0

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional glass part, Fig. 2 is a sectional view of a glass part according to the present invention, Fig. 3 is a sectional view of Fig. 2 when assembled, and Fig. 4 is another glass part of the present invention. 5th cross-sectional view of
Figure A is a cross-sectional view of the synthetic resin ring, and Figure 6 is a cross-sectional view of the glass portion used as a reference experiment for the present invention. DESCRIPTION OF SYMBOLS 1...Glass edge, 11...Circumferential groove, 12...Brim portion, 13...Glass receiving surface, 15...Upward surface, 2...
・Glass, 21... Outer diameter surface, 22... Guide slope, 2
3... Rising height part, 25... Upper corner part, 3...
Synthetic resin ring, 31...Inner surface, 34...Extruded portion, 4...Body, Dl...Inner diameter dimension, D2...Outer diameter dimension, C...Gap.

Claims (1)

[Claims] 1. A glass fixing member having a flange on the upper part and a circumferential groove provided inside with a glass receiving surface on the lower part, a lower surface that comes into contact with the glass receiving surface of the circumferential groove, and a height from the lower surface. is set to be lower than the height from the glass receiving surface to the upward surface of the circumferential groove, and the outer diameter is set to be slightly smaller than the inner diameter of the boxwood part. a watch glass having a curved outer diameter surface, a guide slope provided at a lower part of the outer diameter surface, an inner surface compressed by the outer diameter surface of the watch glass, the circumferential groove and the watch glass. By press-fitting the watch glass into the inner surface from above the glass fixing member, the watch glass is extruded from between the upward surface of the circumferential groove and the rising height portion of the watch glass. and a synthetic resin ring having an extruded part that presses and fixes the watch glass from above.