JPS594308Y2 - Watch case back cover waterproof structure - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a waterproof structure for the back cover of a watch case.

In general, a toothed structure and a screw engagement structure are known as means of fixing the case and back cover, and the toothed structure is superior to the screw engagement structure in terms of workability, ease of assembly, cost, etc. Therefore, it is widely used.

Conventionally, the case back waterproof structure with a bite structure includes a vertical compression type in which the waterproof gasket 3 is compressed on the upper and lower surfaces of the case 1 and the case back 2, as shown in Fig. 1, and a case 1 as shown in Fig. 2. There is a side compression type (this type is disclosed in Japanese Utility Model Application Laid-Open No. 53-66258) that compresses the waterproof gasket 3 between the side surface of the camera and the side surface of the back cover 2.

However, both types have their advantages and disadvantages.

That is, in the type shown in FIG. 1, the waterproof gasket 3 is provided on the upper part of the grooved part 4 between the case 1 and the back cover 2, so that the winding stem (not shown) is inserted from the winding stem pipe 5. The height H to the bottom surface of the back cover 2 increases.

On the other hand, in the type shown in FIG. 2, the waterproof packing 3 is disposed on the radially outer side of the bite portion 4, so that the thickness can be reduced by the compressed length of the waterproof packing 3 compared to the type shown in FIG.

However, from the point of view of incorporation and waterproofness, it is the second best.
In the type shown in the figure, the waterproof gasket 3 must be attached to the side of the back cover 2 and pushed into the case 1, so when it is assembled, twisting force is applied to the waterproof gasket 3 by both sides of the case 1 and the back cover 2. In addition, there is a drawback that the waterproof gasket 3 may be bitten by the inner end surface of the body 1, which may cause the waterproof gasket 3 to be cut.

On the other hand, in the type shown in Fig. 1, the waterproof gasket 3 is attached to the body 1.
Since the waterproof gasket 3 is only compressed by the upper and lower surfaces of the back cover 2, the above-mentioned unnecessary force is not applied to the waterproof gasket 3, and the waterproof performance does not deteriorate.

The present invention was developed in view of the above-mentioned drawbacks of the prior art, and aims to provide a waterproof structure for the back cover of a watch case that allows the height from the center of the winding stem pipe to the bottom surface of the back cover to be made thinner without reducing the waterproofness. purpose.

Hereinafter, the present invention will be explained with reference to illustrated embodiments.

FIG. 3 is a sectional view showing an embodiment of the present invention.

A circumferential groove 11 is formed in the lower part of the body 10, the inner side of the circumferential groove 11 is an inner side surface 12 with a bite, and the side surface 13 of the outer side and the groove bottom surface 14 are a packing box surface.

The back cover 20 has a side surface 21 with a groove that engages with the inner surface 12 of the mesh 10, and a circumferential surface 22 facing the side surface 13 and a bottom surface of the groove on the outside in the radial direction of the side surface 21 with a groove. 14 is provided, and the peripheral surface 22 and the stepped portion 23, the side surface 13 of the body 10, and the groove bottom surface 14 form a housing portion for the waterproof packing 3.

Furthermore, a step 24 is provided on the outside of the step 23 of the back cover 20 to restrict movement of the case 10 and the back cover 20 in the vertical direction.

Therefore, in order to fix the back cover 20 to the case 10, a waterproof gasket 3 is provided in the circumferential groove 11 of the case 10, and the back cover 20 is fixed to the case 10.
When the positioning stepped portion 24 of the case 10 contacts the bottom surface of the case 10, the side surface 21 of the case back 20 is engaged with the internal side surface 12 of the case 10, and the case 10 and the case back 20 are engaged with each other. is fixed.

As a result, the waterproof gasket 3 is vertically compressed by the groove bottom surface 14 of the case 10 and the stepped portion 23 of the back cover 20, and exhibits waterproof properties.

In this case, when pushing the back cover 20 into the case 10 as described above, there is a risk of damaging the waterproof gasket 3 at the upper end of the circumferential surface 22, but this is caused by forming the circumferential surface 22 into an arc or taper as shown in the figure. This will resolve the issue.

Since the waterproof gasket 3 is disposed radially outward of the grooved portion 12.21 in this manner, the distance from the center of the winding stem pipe 5 to the lower surface of the back cover 20 can be made thinner.

Also, since the waterproof gasket 3 is compressed in the vertical direction by the groove bottom surface 14 of the case 10 and the stepped portion 23 of the back cover 20, unnecessary force (twisting, galling, etc.) is not applied to the waterproof gasket 3, and the waterproofness is excellent. It becomes something.

In FIG. 4, contrary to the above-mentioned embodiment, the outer side of the circumferential groove 11 of the case 10 is made into an inner surface 12 with a groove, the side surface 13 of the inner part is made into a packing box surface, and the back cover 20 has a groove on the outer periphery. Side 21
A circumferential surface 22 and a stepped portion 23 are provided on the radially inner side of this side surface 21 with a bite.

Even if formed in this way, the same effect as the above embodiment can be achieved.

As is clear from the above explanation, according to the waterproof structure of the back cover of the watch case according to the present invention, the waterproof gasket is disposed in the radial direction of the biting part of the case and the back cover, and is arranged in the groove bottom surface of the circumferential groove. Since the case is compressed vertically by the stepped part of the back cover, the case can be made thinner without reducing its waterproof properties.

[Brief explanation of the drawing]

The figures show the waterproof structure of the back cover of a watch case, FIGS. 1 and 2 are sectional views of a conventional example, and FIGS. 3 and 4 are sectional views of an embodiment of the present invention, respectively. 3... Waterproof packing, 10... Torso, 1
1... Circumferential groove, 12... Inner surface with bite, 13... Side (packing box surface), 14
...Groove bottom, 20...Back cover, 21...
... Side surface with bite, 22 ... Circumferential surface, 23 ...
...Danbe.

Claims (1)

[Scope of utility model registration request] One side of the circumferential groove formed in the lower part of the case is a grooved inner surface, and the other side is a packing box surface, and the back cover has a grooved side surface that engages with the grooved inner surface of the net. A circumferential surface facing the gasket box surface of the net and a step portion facing the groove bottom surface of the circumferential groove are provided in the radial direction of the side surface with the bite, and the gasket box surface and groove bottom surface of the body and the peripheral surface and step of the back cover are provided. A watch case characterized in that a waterproof packing box is formed by the mesh, and a back cover is bitten and engaged with the mesh to compress the waterproof packing vertically between the groove bottom of the body and the stepped part of the case back. Back cover waterproof structure.