JPS625670Y2 - - Google Patents

Description

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

FIG. 1 shows an example of a back cover fixing structure according to the prior art.As shown in FIG.
b, a dowel 2b is formed on the side wall 2a of the back cover 2, and the packing 3 arranged at the bottom of the body 1 is attached to the back cover 2.
There is one that fixes the back cover 2 to the case 1 by pressing it with the bottom surface 2c of the case and by biting the dowel 2b of the case back 2 into the recess 1b of the case 1. In this structure, since the dowel 2b is fitted into the recess 1b by utilizing the radial elasticity of the side wall 2a, as the back cover 2 is opened and closed several times, the elasticity of the side wall 2a weakens and the back cover 2a is opened and closed several times. The disadvantage was that the fixing force of the Also, the packing 3 is compressed vertically between the body 1 and the back cover 2, and the back cover 2 is pushed downward by the compression reaction force of the packing 3, so if the fixing force of the back cover 2 decreases, the back cover 2 will come off. As a result, the packing 3 cannot be compressed properly, resulting in poor waterproof function.

The present invention eliminates the above-mentioned drawbacks, and aims to provide a stable fixing force for the back cover and maintain a reliable waterproof function.

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

Figures 2 to 4 show an embodiment of the present invention,
Figure 2 shows 12 when the back cover is fixed to the body of the watch case.
3 is a partial perspective view of the back cover, and FIG. 4 is a sectional view of the case back in the middle of being attached.

The shell 4 has an outer wall 4a, and the outer wall 4a has a recess 4.
It is equipped with b. A stepped portion 4c on which the packing 5 is disposed is formed on the outer periphery of the lower part of the body 4. on the other hand,
As shown in FIG. 3, the back cover 6 is formed by pressing a flat plate material and has a side wall 6a and a bottom surface 6b. The protrusion 6c is formed by increasing the length and bending the upper end inward. An elastic ring 8 holding the module 7 is used to push down the back cover 6 outward so that the protrusion 6c of the back cover 6 reliably engages with the recess 4b of the case 4 after the back cover 6 is fixed to the case 4. It is something.

The procedure for assembling the camera back 6 and the barrel 4 with the above configuration is as follows: First, as shown in FIG. Then, with the back cover 6 tilted, the protrusion 6c of one side wall 6a is engaged with one of the recesses 4b of the case 4, and the back cover 6 is pushed in the direction of arrow A to elastically deform the packing 5. Then, move the back cover 6 to one side while keeping it in a horizontal state, and bring the bottom surface 6b of the back cover 6 into contact with the elastic ring 8. Next, when the force pushing the back cover 6 is released, the back cover 6 is returned to the center of the case 4 by the elastic reaction force of the packing 5, and the protrusion 6c of the other side wall 6a of the case back 2 is moved into the recess of the case 4. 4b, fixing of the back cover 6 to the case 4 is completed. This state is shown in FIG. 2, and it goes without saying that the relationship between the gap a between the outer wall 4a of the barrel 4 and the side wall 6a of the back cover 6 and the amount of engagement b in the recess 4b of the barrel 4 is such that a>b. It is set up so that it will work.

With the above configuration, the packing 5 disposed on the stepped portion 4c of the case 4 is compressed uniformly in the radial direction by the side wall 6a of the back cover 6, ensuring waterproof function, and at the same time, the elastic ring 8 is By strongly pressing the bottom surface 6b of the case, the projection 6c of the back cover 6 will surely engage with the recess 4b of the body 4, so that the back cover 6 will not shift to one side and a stable fixing force can be obtained. Furthermore, if the back cover 6 is opened and closed by shifting it in the radial direction, deformation of the back cover 6 can be suppressed as much as possible, unlike the conventional case where the dowels 2b are fitted using the radial elasticity of the side wall 2a. Therefore, even if the back cover 6 is repeatedly opened and closed, the initial compression condition of the packing 5 can be maintained for a long period of time.

Note that in the above embodiment, the protrusion 6 of the side wall 6a
c is provided at a position corresponding to the outer wall 4a of the band attaching portion of the body 4, but the pair of protrusions may be provided at other positions as well.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a conventional watch case, Figures 2 to 4 are examples of the present invention, and Figure 2 shows 12 o'clock and 6 o'clock when the back cover is fixed to the body of the watch case.
3 is a partial perspective view of the back cover, and FIG. 4 is a sectional view of the back cover in the middle of being attached. 1, 4... body, 1a, 4a... outer wall, 1b, 4
b... Recess, 2, 6... Back cover, 2a, 6a... Side wall, 2b... Dowel, 2c, 6b... Bottom, 3, 5
...Packing, 6c...Protrusion, 7...Module, 8...Elastic ring.

Claims (1)

[Scope of utility model registration request] A recess 4b is formed in the outer wall 4a of the band attachment part of the body 4.
is provided, and a stepped portion 4c is formed on the lower outer periphery of the body 4,
On the other hand, the back cover 6 formed from a flat plate material has a side wall 6a and a bottom surface 6b, and the side wall 6a has a pair of long parts, and the upper end of the long part is bent inward to form a protrusion. 6c, an elastic ring 8 is attached to the module 7 housed in the case 4, a packing 5 is arranged on the stepped portion 4c of the case 4, and the protrusion 6c of the case back 6 is inserted into the recess of the case 4. 4b, the bottom surface 6b of the back cover 6 is brought into contact with the elastic ring 8, and the packing 5 is compressed in the radial direction by the side wall 6a of the back cover 6.