JPH0129593Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a back cover structure of a watch case in which a back cover is attached to a watch case body.

[Prior art]

Conventionally, as a wristwatch case, one shown in FIG. 1 is known. That is, the watch case body 1
A back cover attachment part 4 is formed in the concave notch 3 of both band attachment parts 2 formed in the back cover attachment part 4.
The back cover 5 is attached to the lower part of the watch case body 1 by engaging the hook portion 6 of the back cover 5 constructed as shown in FIG. That is, although this type of watch has the back cover attachment part 4 provided on the outside of the watch case body 1, the use of the band attachment part 2 prevents the appearance from being impaired.

In this case, as shown in FIG. 2, the back cover 5 is formed with upright portions 7 that stand up vertically from the upper surface periphery in correspondence with the band attachment portions 2, respectively.
A pair of hook portions 6, 6 are provided on both sides of the upper end surface of the upright portion 7, and are bent outward into an arc shape.

By the way, in this type of product, when pressing the back cover 5, first, in the first step, the hook portion 6 is formed vertically at the same time as the upright portion 7, and then, in the second step, Although the hook portion 6 is formed by bending into an arc shape, there is a risk that the hook portion 6 will be formed with a large inclination as shown by the broken line in FIG. In this way, the hook part 6
If the back cover 5 is formed to be tilted, when the back cover 5 is attached to the watch case body 1, the hook part 6 of the back cover 5 rides on the extension part 8 of the band attachment part 2, making it impossible to attach the back cover 5 to the watch case body 1.

Therefore, with respect to the dimension A between the corresponding side surfaces of both the extending parts 8, 8 constituting the band attachment part 2 (dimension in the longitudinal direction of the cutout part 3), the outer side of both the hook parts 6, 6 (the extending part 8, 8) by significantly reducing the dimension B between the sides of each hook portion 6, 6.
and a clearance part C of a predetermined size between the extension parts 8, 8,
C is provided to absorb deformation of the hook portion 6.

[Problems with conventional technology]

However, in this way, the clearance part C,
If C is provided, play will occur between the watch case body 1 and the back cover 5 by the addition of both clearance parts C and C, and the O-ring provided between the watch case body 1 and the back cover 5 will be There was a risk of misalignment and poor airtightness.

[Purpose of invention]

This idea was developed against the background of the above-mentioned circumstances, and its purpose is to maintain good airtightness by preventing play between the watch case body and the back cover with a simple structure. It is an object of the present invention to provide a back cover structure of a watch case.

[Key points of the idea]

In order to achieve the above-mentioned purpose, this invention
In a watch case in which a hook part provided on the upper surface of the back cover through an upright part is engaged with a back cover attachment part in a notch provided in the watch case body, the hook part is located in the notch part and Even if a clearance portion of a predetermined size is provided between the side surface of the watch case body and the side surface of the watch case body forming the notch, a clearance portion of a predetermined size may be formed on at least one side surface of the upright portion to protrude toward the side surface of the watch case body. The gist is that by providing the stepped portion, play between the watch case body and the back cover is prevented.

〔Example〕

Hereinafter, one embodiment of this invention will be explained in detail with reference to FIGS. 3 to 6. In FIGS. 3 to 6, components that are substantially the same in structure as those shown in FIGS. 1 and 2 are designated by the same reference numerals, and their explanations will be omitted. Inside the notch 3 constituting the band attachment part 2 of the watch case body 1, there is a pair of back cover attachment parts 4, 4 integrally molded on the inner wall surface 1a of the watch case body 1 forming the notch 3.
is provided. The back cover mounting portion 4 is a flat plate-shaped protrusion formed on both sides of the lower side of the inner wall surface 1a.

In addition, in the back cover 5, both the hook portions 6, 6 By significantly reducing the dimension B between the side surfaces on the outside (the side facing the extensions 8, 8), a clearance part C of a predetermined size is created between each hook part 6, 6 and the extension part 8, 8. C is provided, but the longitudinal dimension D of the standing portion 7 is the above-mentioned dimension B.
It is formed slightly larger than that, and provides a gap between the side surfaces of the upright portions 6, 6 and the side surfaces of the extension portions 8, 8. That is, in this embodiment, stepped portions 9, 9 are formed on both longitudinal side surfaces of the upright portion 7 to protrude in the side surface direction of the extension portion 8, and form a step of a predetermined size with respect to the side surface of the hook portion 6. The structure has been set up. Note that 10 in the figure indicates an O-ring interposed between the watch case body 1 and the back cover 5.

When attaching the back cover 5 to the watch case body 1, insert the hook parts 6, 6 of the back cover 5 into the notch 3 of the watch band attachment part 2, and then attach the hook parts 6, 6 to the back. Push up the back cover 5 strongly while pressing it against the lower surfaces of the cover attachment parts 4, 4. As a result, the hook parts 6, 6 cross over the back cover mounting parts 4, 4, and the inner wall surface 1 forming the notch 3, as shown in FIG.
It will fit on the top of a. In this case, even if the hook parts 6, 6 are deformed, the clearance parts C, C are provided between the hook parts 6, 6 and the extension parts 8, 8, respectively, so that the watch case body The inconvenience of not being able to attach the back cover 5 to the camera 1 does not occur.

In this way, when the back cover 5 is attached to the watch case body 1, even if force is applied to the watch case body 1 in the direction in which the back cover 5 rotates, the stepped portions 9, 9
Since the ring abuts against the extensions 8, 8, there is no play between the watch case body 1 and the back cover 5, and therefore the ring 10 does not shift, so that airtightness is not impaired.

In addition, although the said Example utilized the notch part 3 of the band attachment part 2, a notch part is not limited to a band attachment part. In addition, various modifications and applications are possible without departing from this invention.

[Effect of idea]

As explained in detail above, this invention is such that a hook part provided on the upper surface of the back cover through an upright part engages with a back cover mounting part in a notch provided in the watch case body. In the watch case, even if a clearance portion of a predetermined size is provided within the notch between the side surface of the hook portion and the side surface of the watch case body forming the notch, the clearance portion may be provided on at least one side of the upright portion. By providing a step that protrudes from the side of the watch case body, it prevents looseness between the watch case body and the back cover, thereby maintaining airtightness between the watch case body and the back cover. be able to.

[Brief explanation of the drawing]

Figures 1 and 2 show a conventional example, Figure 1 is a side view of the watch case, Figure 2 is a side view of the case back, and Figures 3 to 6 are one embodiment of this invention. 3 is an exploded perspective view, FIG. 4 is a side view, FIG. 5 is a side view of the camera back, and FIG. 6 is an enlarged sectional view of the main parts. 1... Watch case body, 3... Notch, 4...
Back cover mounting part, 5...Back cover, 6...Hook part, 7...
... Standing part, 9... Step part.

Claims (1)

[Scope of utility model registration request] In a watch case in which a hook part formed by bending the upper part of the upright part of the back cover is engaged with a notch part formed on the side surface of the watch case body, the lower side surface of the upright part is placed in the direction of the side face of the notch part. 1. A back cover structure for a watch case, characterized in that a stepped portion is formed by protruding from the outside, and the stepped portion is positioned by a side surface of the notch.