JPS6129467B2 - - 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 a case 4 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 excellent plasticity, heat resistance, and chemical resistance of Teflon resin.
It is capable of maintaining extremely stable waterproofness and fixing strength, and together with the simplification of the number of parts and structure, it has become the mainstream of today's glass fixing structures.

Based on experience, the structure described above requires that the height of the Teflon resin ring be at least
It is said that 1.2mm is required, and commercialization with a value lower than this was impossible. In addition, the actual thickness of the glass is 1.3 mm, since the upper slope 25 will be provided on the outer periphery for aesthetic reasons and to prevent glass breakage.
is considered to be the limit.

However, today, the thickness of mechanical movements is 2 to 3 mm, and the thickness of electronic movements is also 3 to 3 mm.
As it becomes 4mm, the watch case is also as thin as possible.
There was a need to move toward smaller size.

In view of the above-mentioned needs, the structure of the present invention was invented with the aim of making watch cases as thin as possible.
This is an epoch-making device that allows the watch glass to be fixed to glass fixing members such as the glass rim or body.
In other words, conventional synthetic resin rings are placed between the glass and the body, and the reaction force maintains the fixing force and waterproofness between the glass, the synthetic resin ring, and the body, but this synthetic resin ring When compressed in the radial direction, the synthetic resin ring undergoes elastic and plastic deformation toward the upper end, and as a result, the reaction force applied to the shell and glass is reduced by that amount, creating a strong fixing force. Also, it was not possible to obtain waterproof properties. As a result of pursuing the above-mentioned problems, the present inventors discovered the following points.

The waterproofness between the glass and the synthetic resin ring is
This can be guaranteed as long as 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 volumetrically compressed synthetic resin ring is partially extruded through a small gap and placed on the upper slope of the glass, the glass fixing force is greatly improved.

The structure of the present invention is such that a circumferential V-shaped groove formed of a substantially horizontal glass receiving surface and an inclined surface that is continuous with the glass receiving surface and tilts upwardly and inwardly and reaches as far as the inner diameter of the flange. a glass fixing member provided in the flange, the vertical and rising height portions being lower than the upper edge formed by the slope of the circumferential V-shaped groove and the inner diameter portion of the flange portion, and the outer diameter dimension being the inner diameter dimension of the flange portion; a watch glass having a vertical outer diameter surface formed to have a diameter slightly smaller than that of the watch glass; an inner surface compressed by the surface, an outer surface substantially coincident with the V-shaped groove, and a volume compressed when the watch glass is press-fitted into the inner surface from above the glass fixing member; and a synthetic resin ring having an extruded part that is extruded from between the upper edge of the watch glass and the rising height part of the watch glass onto the upper slope or top surface of the watch glass and fixes the watch glass from above. This structure provides a small and thin watch case in which an ultra-thin watch glass can be fixed to the glass rim, case, etc.

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

2 and 3 show embodiments according to the present invention, 1
2 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 V-shaped groove 11 for mounting the synthetic resin ring 3 is formed on the inner circumferential surface of the glass edge 1, and this V-shaped groove 11 has a slope that faces upward and slopes inward.
A collar portion 12 for volumetrically compressing the synthetic resin ring 3 is formed in the upper part of the V-shaped groove 11, and this collar portion 12 has an inner diameter portion that intersects with the slope of the V-shaped groove. Further, a glass receiving surface 13 for receiving the lower surface of the glass 2 is formed substantially horizontally at the lower part of the V-shaped groove 11. Furthermore, an inclined surface 14 is formed on the upper surface of the flange portion 12 to facilitate assembly of the glass 2.

The groove depth _L1 of the V-shaped groove 11 is such that the compression allowance portion of the synthetic resin ring 3 protrudes inward,
The inner diameter dimension D ₁ of the inner diameter portion of the flange portion 12 is formed to be slightly larger than the outer diameter dimension D ₂ of the glass 2 in order to serve as a guide when the glass 2 is assembled.

On the other hand, the outer diameter surface 2 is almost perpendicular to the outer periphery of the glass 2.
1 is formed, and a lower surface 24 that directly contacts the glass receiving surface 13 and a guide slope 22 that serves as a guide when press-fitting into the synthetic resin ring 3 are formed at its lower part. The outer diameter dimension _D2 of the outer diameter surface 21 is slightly smaller in diameter than the flange part 12 of the glass edge 1, and the synthetic resin 3
It is formed so as to compress the compression allowance part of.

The rising height portion 23 at the intersection of the outer diameter surface 21 and the upper slope 25 has a distance H ₂ from the lower surface 24 of the glass 2 to the upper edge 1 of the circumferential V-shaped groove 11.
5, and a gap C is provided between the upper edge 15 and the upper edge 15. The point of intersection 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. This prevents the synthetic resin ring 3 from being drawn in during glass press-fitting, and also prevents the glass 2 from being drawn in. Reduces press-fit resistance.

Note that the upper slope 25 of the glass 2 is necessary for aesthetic reasons.
Furthermore, it also serves to prevent the glass 2 from breaking, but from the perspective of the purpose of the present invention, it may be directly connected from the outer diameter surface 21 to the top surface 26 of the glass, as shown in FIG. The shape of the synthetic resin ring 3 before assembly is as shown in FIGS.

The height of this synthetic resin ring 3 is the same as or slightly lower than the height of the upper edge 15 of the V-shaped groove 11. In addition, as shown in Figure 5B, there is a glass 2 at the bottom.
A synthetic resin ring 3 having a bulge 33 that fits under the guiding slope 22 of the glass 2 is also conceivable;
It is essential that the synthetic resin ring 3 always has an inner surface 31 compressed by the synthetic resin ring 3 .

The synthetic resin ring 3 has a V-shaped groove 11 and an outer diameter surface 21
It is strongly compressed within the space formed by the guide slope 22, and due to the plastic properties of this synthetic resin, it infiltrates the surface of the space without any corners, thereby maintaining waterproofing between the members and fixing force of the glass 2. Further, a part of the synthetic resin ring 3 is pushed out from the gap C by strong volumetric compression and is formed as an extruded part 34, which presses the upper slope 25 of the glass 2 downward.

Next, regarding assembly, as shown in Fig. 3, the synthetic resin ring 3 is placed in the V-shaped groove 11 of the glass edge 1, and the glass 2 is placed in a position using the brim 12 and slope 14 as guides. The glass 2 is placed and 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, a part of the synthetic resin ring 3 is pushed out from the gap C, and an extruded part 34 is formed on the upper slope 25, thereby increasing the fixing force of the glass 2. will be greatly improved.

As described above, the structure of the present invention is much superior in waterproofness and fixing power compared to conventional structures, and based on the three facts mentioned above and further experiments, the thickness of the glass has been improved. It has become possible to make it as thin as 0.4mm. This means that the traditional structure
This is truly revolutionary considering that it was only possible to use glass up to 1.2mm thick. As for the material of the synthetic resin ring, in addition to the Teflon resin used in the previous experiment, materials with appropriate plasticity such as nylon 11, nylon 12, Tefzel, Perprene, Aflon, polyethylene, polycarbonate, etc. are considered. Among these, Teflon resin is the most suitable because of its extremely high plasticity.

In addition to the structure (Fig. 2) in which a V-shaped groove is provided on the edge of the glass and the glass is fixed thereto, the present invention also provides a structure in which a V-shaped groove is provided in the body as a glass fixing member and the glass is fixed thereto. (Figure 4) is also naturally possible.
Furthermore, instead of glass, glass edges, back lids,
It is of course possible to adopt the structure of the present invention when attaching a battery cover or the like to other exterior parts.

As described above, the present invention strongly compresses a synthetic resin ring between the glass and the V-shaped 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 protrusion is formed by pushing out 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. , the height of the ring, etc. are made unnecessarily large, and 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. Since it is extruded onto the upper slope of the glass, 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 fully meets the demands of today's thin and small watch cases. It is something that can be done. Moreover, since the outer diameter surface of the synthetic resin ring coincides with the slope of the V-shaped groove, the volume of the synthetic resin ring can be easily compressed, and the extruded portion can be formed reliably. Furthermore, since the groove is a reverse tapered V-shaped groove, cutting can be performed advantageously.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a conventional glass part, Figure 2 is a sectional view of a glass part according to the present invention, Figure 3 is a sectional view of Figure 2 when assembled, and Figure 4 is another glass part of the present invention. FIGS. 5A and 5B are sectional views of the synthetic resin ring. 1...Glass edge, 11...V-shaped groove, 12...Brim portion, 13...Glass receiving surface, 15...Top edge, 2...Glass, 21...Outer diameter surface, 22...Guiding slope, 23...Rising height portion, 25...Upper slope, 3...Synthetic resin ring, 31...Inner surface, 3
4... Extrusion part, 4... Body, D ₁ ... Inner diameter dimension, D ₂
...Outer diameter dimension, C...Gap.

Claims (1)

[Claims] 1. A glass provided with a circumferential V-shaped groove on the inside, which is composed of a substantially horizontal glass receiving surface and a slope that is continuous with the glass receiving surface, tilts upward and inward, and reaches the inner diameter of the brim. a fixing member, the rising height portion is lower than the upper edge formed by the slope of the circumferential V-shaped groove and the inner diameter portion of the collar portion, and the outer diameter dimension is slightly smaller than the inner diameter dimension of the collar portion; A watch glass is compressed by the formed vertical outer diameter surface, a lower surface that contacts the glass receiving surface of the glass fixing member, and a guide slope at the bottom of the outer diameter surface, and the outer diameter surface of the watch glass. When the watch glass is press-fitted into the inner side from above the glass fixing member, the volume is compressed, and the upper edge of the circumferential V-groove and the outer side of the watch glass are compressed. A structure of a glass part of a watch case comprising a synthetic resin ring having an extruded part that is pressed against the upper slope or top surface of the watch glass from between the rising height part and fixes the watch glass from above.