JPS5914790Y2 - Watch back cover mounting structure - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a watch back cover attachment structure for attaching the back cover to a watch case, particularly a watch case made of cemented carbide metal, using a screw.

The conventional method of attaching a back cover to a watch case is to install a female screw on the watch case itself, and a male screw on the back cover, and use these screws to attach the watch case to the watch case. The back cover is screwed on.

However, recently, cemented carbide metals are sometimes used for watch cases due to aesthetic requirements or durability requirements.
When a watch case is made of cemented carbide metal, its hardness is extremely high, making it extremely difficult to directly screw a screw or the like into the watch case.

Therefore, as a method of attaching the back cover to the watch case without the need to screw screws into the watch case made of cemented carbide metal, as shown in Figure 1, the inner case 2 is glued to the watch case 1, and the back cover is attached to the watch case. The middle frame 4 is attached to the middle body 3, and the engagement recess 5 is attached to the middle body 2.
In addition, each of the middle frame 4 is formed with an engaging convex part 6, and the engaging concave part 5 of the middle body 2 and the engaging convex part 6 of the middle frame 4 engage with each other by utilizing the elasticity of the back cover 3. In this case, if waterproof or sweatproof properties are required, the inner frame 4, middle body 2, or back cover is fixed to the watch case as shown in Fig. 2. A structure is adopted in which a backing 7 is bonded between the lids 3.

Another method for attaching the back cover without the need for screwing into the watch case is to form a hole 8 in the watch case 1, as shown in FIG. When the back cover 3 is inserted into the watch case, the leaf spring 9 pushes into the hole 8 of the watch case due to its elasticity, and the back cover 3 and the watch case 1 are engaged with each other.

In this case as well, if waterproof or sweatproof properties are required, a backing 11 is inserted between the back cover 3 and the watch case 1 as necessary.

However, with this type of structure, the attachment of the case back to the watch case is not always reliable, it is not always easy to make the watch completely sweatproof and waterproof, and it is often subject to design constraints. Ta.

This idea was created in view of the above circumstances, and allows for secure attachment of the case back and the cemented carbide metal watch case using the same screws, while improving sweat and water resistance. It is an object of the present invention to provide a mounting part structure for a back cover of a wristwatch that can be attached to the back cover of a wristwatch and has an excellent design.

In response to this purpose, the watch back cover mounting structure of this invention is
A hole is formed in the periphery of the watch case, a pipe with a thread carved on the inner surface is fixed in the hole, and the back cover is fixed to the watch case by screwing the screw into the pipe thread. It is characterized by what it did.

The details of this invention will be explained below with reference to the drawings showing one embodiment.

4 and 5, 20 is a wristwatch, and the wristwatch 20 has a case 21. made of cemented carbide metal. A back cover 23 is provided, and the back cover 23 and the case 21 work together to house a movement 24.

There is a backing 25 between the movement 24 and the case back 23.
is stored.

Further, a glass 27 is fitted into the window 26 of the case 21.

The structure of the fixing portion between the case 21 and the back cover 23 is shown in particular detail in FIG.

That is, a side wall 28 is formed rising up on the peripheral edge of the back cover 23, and a metal inner frame 29 is formed in a rising position at a distance inside the side wall 28 and is fixed to the back cover 23. The peripheral part 3 of the case 21 is located between the part 28 and the middle frame 29.
1 is inserted.

A backing 32 is provided between the tip of the peripheral portion 31 and the back cover 23.
is caught in the middle.

A through hole 33 is formed in the peripheral edge 31 of the case 21, and a stainless steel metal pipe 34 is inserted into the through hole 33, and the metal pipe 34 is fixed to the case 21 at the outer periphery by brazing.

A female thread 35 is formed on the inner periphery of this metal pipe 34 .

On the other hand, a screw 37 as shown in FIG. 6 is inserted through a through hole 36 in the side wall 28 of the back cover 23 concentrically with the metal pipe 34, and this screw 37 is screwed into the metal pipe 34.

As a result, the back cover 23 is attached to the case 21.

Between the towaji 37 and the metal pipe 34, there is an O
- Insert a sealing material 38 such as a ring.

A movement fixing resin frame 39 is supported by a metal inner frame 29 fixed to the back cover 23, and this movement fixing resin frame 39 supports the movement 24.

In the back cover mounting structure configured in this way, it is not necessary to directly screw a screw into the case 21 made of cemented carbide metal, so processing of the case 21 is extremely easy. Since it is extremely easy to braze the pipe 34 to the case 21 and to screw a screw into the metal 34, there is no difficulty in machining it.

Furthermore, the sealing material 38 and the backing 32 can be held securely by fixing them using the screws, and the sweat resistance and water resistance can be improved.

Also, with this configuration, different materials can be selected for the case 21 and the back cover 23, and by combining the back cover and the case made of different materials, the width of the design can be expanded, and the width of the case can be expanded. By installing this, it is possible to increase the value of the product and give the user a sense of security.

In addition, the shape of the back cover and the entire case are smooth, so there is no discomfort when wearing the watch on your wrist.

Furthermore, the overall case line has a slim shape, making it easy to express the natural beauty of functionality by achieving both function and design.

[Brief explanation of the drawing]

Fig. 1 is a partially explanatory longitudinal cross-sectional view showing a conventional back cover mounting structure, Fig. 2 is a partially explanatory longitudinal cross-sectional view showing another conventional back cover mounting structure, and Fig. 3a is a conventional back cover mounting structure. FIG. 3 is an exploded partial perspective view of the back cover attachment structure shown in FIG. 3a, FIG. 4 is a perspective view of the wristwatch, and FIG.
FIG. 6 is an exploded perspective view of a wristwatch with a back cover mounting structure according to an embodiment of the invention, FIG. FIG. 7 is a side view showing the screw. 20...Watch, 21...Case, 2
3...Back cover, 24...Movement,
25...Backing, 27...Glass, 28...Side wall portion, 29...Inner frame, 3
1...peripheral part, 34...metal pipe,
37...This screw, 38...Sealing material,
39...Movement fixed resin frame.

Claims (2)

[Scope of utility model registration request] (1) A watch case with a hole formed on the periphery, a metal pipe with a screw threaded on the inner surface and fixed in the hole of the case, and a through hole that rises from the periphery and can be located concentrically with the metal pipe. A back cover having a side wall portion provided with a hole; an inner frame fixed in an upright position at intervals inside the side wall portion of the back cover; and a connection between the tip of the peripheral edge of the case and the back cover. A backing that is inserted between the backing and the periphery of the case is inserted between the side wall of the back cover and the middle frame, and then the backing is inserted into a hole in the case and screwed onto the metal pipe. A watch back cover attachment structure characterized by consisting of a screw for attaching the back cover to the case. (2) The watch back cover attachment structure according to claim 1, which is a registered utility model, characterized in that a sealing material is bonded between the metal pipe and the screw.