JPH0140075Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mechanical fixing structure for a portable watch that uses a box-shaped inner frame on the back cover side.

Conventionally, portable watches that do not use waterproof gaskets on the back cover side easily allow moisture, dust, etc. to enter, so relatively expensive non-waterproof portable watches have a box-shaped backside as shown in Figure 1. Adopts a structure that covers the entire surface with a synthetic resin inner frame. However, according to this structure, since the brim of the inner frame 4 is brought into close contact with the inner circumferential wall of the case 6, it is difficult to control the shape of the outer shape of the inner frame and the inner wall of the case. The department had a narrow gap. As a result, the upper surface of the dial may be damaged due to rattling of the mechanical body when the watch is pulled out or dropped, and moisture and dust may enter through the contact area of the inner frame, causing the machine to stop due to rust, discoloration of the dial, and circuits. Problems such as leaks have been occurring. In addition, as watches have become thinner in recent years, the height of the back cover has also become thinner, making it easier for sweat from the skin to get in. Therefore, it was hoped that a structure with a higher quality level could be realized as soon as possible.

The purpose of the present invention is to eliminate such problems, and its purpose is to effectively prevent sweat, dust, rainwater, etc. from entering the machine body housed in the case from the outside.
Another object is to securely fix the mechanical body.

The gist of the present invention is that a case 16 has a glass 11 attached to the front side and an opening 16b on the bottom side.
, a back cover 15 that covers the opening 16 b of the case 16 and is attached to the case 16 , a mechanical body 13 housed in the case 16 , and a back cover 15 that covers the back cover side of the mechanical body 13 and has a box-shaped cross section. The case 16 has _an inner frame 14 made of synthetic resin that is pushed up and held toward the glass ₁₁ by the case 16. An inner wall 16a is formed on the inner frame 14.
A flange 14a is formed on the outer periphery of the inner frame 14 and has a slight gap with the inner wall 16a when the inner frame 14 is inserted into the case 16. The diameter is smaller than the diameter D ₁ on the back cover side of the inner wall 16 a and larger than the diameter D ₂ on the glass side. This mechanical fixing structure for a portable watch is characterized by being formed with a protrusion 14b that is compressed when placed.

The present invention will be explained in detail below with reference to the drawings. Second
The figure is a sectional view showing an embodiment of the present invention.
16 is a case of a mobile watch, with glass 11 on the front side.
is attached and has an opening 16b on the bottom side,
A back cover 15 covers this opening 16b and is attached to the bottom side of the case 16. The case 16 is provided with an inner wall 16a, into which a mechanical body 13 supporting the dial 12 and an inner frame 14 made of synthetic resin are inserted. Further, an inner frame 14 for fixing the mechanical body 13 covers the entire mechanical body from the back cover side. The collar 1 of this middle frame 14
4a is pushed up by the back cover 15 and fixes the machine body upward. A protrusion 14b is provided all around the outer periphery of the collar 14a. By pushing the middle frame 14 into the case 16, the protrusion 1
4b is gradually compressed according to the slope of the inner wall of the case 16, making it sweatproof and dustproof. This inner wall 1
The slope of 6a is set such that the diameter D ₁ on the bottom side of the case 16 is large and the diameter D ₂ on the glass side 11 side is small. In addition, the protrusion 14 of the middle frame 14
The diameter b is set smaller than the diameter D ₁ and larger than the diameter D ₂ . Therefore, the inner wall 1 of the case 16
The inner frame 14 can be easily assembled into the inner frame 6a by simply inserting it. Then, the middle frame 14 is in the normal position with respect to the case 16, that is, the mechanical body 13 is in the normal position with respect to the case 16.
In the state shown in FIG. 2 when properly housed, the protrusion 14b is compressed by the sloped inner wall 16a. Further, in order to prevent the inner frame from being shifted to one side during compression, the cross-sectional shape of the projection 14b is a trapezoidal shape with a slope from the tip to the flange 14a. When assembled in a biased state, the flange portion 14a of the biased portion has a large contact area with the inner wall of the body and becomes difficult to deform, so that it is gradually corrected in the opposite direction. In particular, since the outer circumferential surface of the flange portion 14a has a narrow clearance with respect to the inner wall 16a for supporting the middle frame of the case 16, the mechanical body 13 is securely fixed to the case 16 without shifting.

According to the present invention, the compressed and fixed box-shaped inner frame blocks the intrusion of sweat, dust, rainwater, etc. from the outside, so that a portable watch with excellent sweat-proof and dust-proof properties is possible. In particular, the quality level is high in terms of perspiration from the skin, so it is possible to create a dress-like product with a thin back cover.

Regarding fixation of the machine body, the middle frame protrusion is compressed and held, and there is no play in the machine body. Furthermore, since the inner frame is simply placed over the machine body and pushed in lightly, assembly is simple and can be easily expanded to automation. As described above, the present invention is a mechanical fixing structure for a portable watch that has a simple structure but is excellent in quality, design, and manufacturing.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional embodiment. FIG. 2 is a sectional view showing an embodiment of the present invention. FIG. 3 is a side view of the middle frame according to the present invention. 1,11...Glass, 2,12...Dial board,
3, 13... Mechanical body, 4, 14... Middle frame, 14a
...Brim portion, 14b...Protrusion, 5, 15...Back cover, 6, 16...Case, 16a...Inner wall of case, 16b...Opening of case, D ₁ ...Back cover of inner wall of case Side diameter, D ₂ ... Diameter of the glass side of the inner wall of the case.

Claims (1)

[Scope of utility model registration request] A case 16 having a glass 11 attached to the front side and an opening 16b on the bottom side, a back cover 15 that covers the opening 16b of the case 16 and is attached to the case 16, and a machine housed in the case 16. body 13
The back cover 1 covers the back cover side of the mechanical body 13 and has a box-shaped cross section.
The case 1 has an inner frame 14 made of synthetic resin that is pushed up and held by the glass 11 side by the case 1.
6 has a larger diameter D ₁ on the back cover side and a larger diameter D ₂ on the glass side.
An inner wall 16a is formed on the outer periphery of the inner frame 14 so that when the inner frame 14 is inserted into the case 16, there is a slight difference between the inner wall 16a and the inner wall 16a. Brim portion 1 with clearance
4a, which is formed over the entire circumference at the outer circumferential tip of the flange portion 14a, and whose diameter is smaller than the diameter D ₁ on the back cover side of the inner wall 16a and larger than the diameter D ₂ on the glass side, and whose cross-sectional shape is from the tip to the flange portion 14a. The middle frame 14 is formed into a trapezoid that widens over the case 1.
protrusion 14 that is compressed when installed and disposed within 6;
1. A mechanical fixing structure for a portable watch, characterized in that a mechanically fixed structure is formed.