JPH0637355Y2 - Mobile watch mechanical structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a mechanical body fixing structure for a portable timepiece.

[Conventional technology]

As a typical mechanical body fixing structure of a conventional portable timepiece, there is, for example, a sectional view of a main part of FIG. In this structure, the dial 1 is fixed to the machine body 2 by a general dial foot screw fixing method, and the inner periphery of the middle frame 3 made of an elastic material and the machine are formed at the step 2a of the main plate of the machine body 2. A back cover in which the body 2 is fitted inside the body 5 to which the glass 4 is fixed, and the middle frame 3 which already holds the main plate step portion 2a of the machine body 2 from below is fixed to the body 5 with screws in a detachable manner. The upper surface of the core 6a fixed to 6 was pushed up in the axial direction to fix the mechanical body 2. The core 6a is fixed to the back cover 6 by welding or brazing, or the back cover 6 and the core 6a are integrally formed by squeezing and descending, and then the outer circumference of the core 6a is waterproofed. After mounting the packing 7, it is fixed to the body 5 with screws.

[Problems to be solved by the invention]

In this conventional mechanical body fixing structure for a portable timepiece, since the impact received from the outside of the timepiece is received by the parting portion 5a of the case body 5, a force is directly applied to the dial 1 and the deformation of the dial 1 is of course a machine. It also has an adverse effect on body 2. On the other hand, when viewed from the processed surface of the back cover 6, the core 6a is made of metal, so the workability for molding is poor, and in addition, the back cover 6 is welded or welded in order to have a waterproof function. Since it is attached and attached, the positional accuracy of the core 6a is strictly required, and the workability is poor. In addition, since the core 6a is fixed to the back cover 6 by welding or brazing, high heat is applied to the back cover 6 during processing, which may cause material deformation or discoloration. There was a problem. In addition, if the material of the back cover 6 is special such as precious metal or hard material, it is very difficult to weld and braze the core 6a.

The object of the present invention is to eliminate the above-mentioned drawbacks of the conventional mechanical body fixing structure, to reduce the external impact on the dial and the mechanical body, to facilitate the manufacture of the back cover, and to make the back cover of a special material on the watch side. The purpose of the invention is to provide a mechanical body fixing structure that can be used for the above and has a waterproof function.

[Means for solving problems]

According to the configuration of the present invention, in the mechanical body fixing structure in which the mechanical body is fixed to the inside of the case body of the watch case through the middle frame, the middle frame made of the resin of the soft material has the elastic partial projections in the radial direction and the axial direction. The upper and lower parts are integrally molded, and in order to elastically dispose the machine body inside the case, the machine body is fitted to the inner circumference of the middle frame, and the radial projection of the middle frame is formed on the inner side of the case side. And the upper projection in the axial direction is pressed against the lower surface of the inner circumference of the upper part of the case, and the upper surface of the auxiliary ring made of a relatively hard resin aligned inside the case is pressed against the lower projection in the axial direction. Then, a packing box is formed by the outer circumference of the side portion of the auxiliary ring and the step portion of the inner circumference of the lower surface of the body, the packing is arranged in the packing box, and the lower surface of the auxiliary ring and the packing are pressed in the axial direction. Screw the back cover with a flat inner surface onto the underside of the barrel. One in which the.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of an essential part showing a mechanical body fixing structure of a portable timepiece according to an embodiment of the present invention.

FIG. 2 is a plan view of a middle frame used in this mechanical body fixing structure, and FIG. 3 is a partial cross-sectional view of the middle frame.

The base plate step portion 8a of the machine body 8 to which the dial plate 10 is attached is integrally formed with the elastic portions of the radial projection 9a, the axial upper projection 9b, and the axial lower projection 9c, and is a middle frame made of a relatively soft resin. 9
The inner frame 9 fitted with the mechanical body 8 is mounted inside the body 11 to which the glass 16 is fixed, and the elastic portion of the middle frame 9 in the radial direction is pressed against the inner periphery of the side of the body 11. At the same time, the elastic portion on the upper side in the axial direction is brought into pressure contact with the lower surface of the inner periphery of the upper portion of the body 11. As a result,
The elastic portion of the radial projection 9a of the middle frame 9 elastically fixes the mechanical body 8 to the case body 11 in the radial direction.

The material of the middle frame 9 is polyacetal resin. Further, in order to prevent the dial 10 from directly hitting the parting portion 11a of the body 11, the axial upper projection 9b of the middle frame 9 is formed by the dial 10
It is made slightly higher than the upper surface of. Moreover, the middle frame 9
In order to obtain stability in fixing in the axial direction, the axial upper protrusion 9b and the axial lower protrusion 9c are provided in parallel at the four corners.

Next, an auxiliary ring made of a relatively hard resin, which is arranged in alignment with the inside of the body 11, at the elastic portion of the lower portion of the middle frame 9 in the axial direction.
The upper surface of 12 is pressed. At this time, a packing box 11b for waterproofing is formed by the outer periphery of the side of the auxiliary ring 12 and the step of the inner periphery of the lower surface of the case 11. The packing 13 is arranged in the packing box 11b, and the lower surface of the auxiliary ring 12 and the packing
A back cover (15) having a flat inner surface is fixed to the lower surface of the body (11) with a screw (14) so that (13) and (13) are pressed in the axial direction. As a result, the auxiliary ring
Since 12 is received by the inner surface of the back cover 15 and pushed up in the axial direction, the elastic portions of the axial upper projection 9b and the axial lower projection 9c of the middle frame 9 are separated by the parting portion 11a of the body 11 and the upper surface of the auxiliary ring 12, respectively. Therefore, the mechanical body 8 is elastically fixed in the axial direction.

In this embodiment, the auxiliary ring 12 is made of polyacetal resin containing glass fiber.
In addition to the conventional stainless steel, the back cover is made of gold or Ni-Cr-Al alloy that can be aged.

[Effect of device]

As is clear from the above description, according to the mechanical body fixing structure of the present invention, as shown in FIGS. 2 and 3, the middle frame made of a relatively soft resin has upper and lower portions in the radial and axial directions. An elastic portion of a partial projection is provided on the back cover, and the middle frame is pushed up in the axial direction by the upper surface of an auxiliary ring made of a relatively hard resin received by the back cover. With respect to the impact received from the outside of the side, the deformation of the dial does not adversely affect the mechanical body as well.

On the other hand, since the core is not required from the processed surface of the back cover, there are no problems with the functions such as material deformation and discoloration due to the high heat generated during welding or brazing and problems with the appearance quality, and the processing load such as drawing processing, and the yield and Workability was improved. Also, welding or brazing has been eliminated, and it has become possible to use special materials such as precious metals and hard materials for the back cover.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a mechanical body fixing structure for a portable timepiece showing an embodiment of the present invention, FIG. 2 is a plan view of a middle frame used in the embodiment of FIG. 1, and FIG. , A- in the middle frame shown in FIG.
FIG. 4 is a sectional view of a main part showing a mechanical body fixing structure of a conventional portable timepiece. 1,10 …… Dial plate, 2,8 …… Mechanical body, 2a, 8a …… Ground plate step,
3,9 …… Middle frame, 4,16 …… Glass, 5,11 …… Body, 5a, 11a…
… Parting part, 6,15 …… Back cover, 6a …… Core, 7,13 …… Packing, 9a …… Radial projection, 9b …… Axial upper projection, 9c ……
Lower axial projection, 11b …… Packing box, 12 …… Auxiliary ring, 14 …… Screw.

Claims (1)

[Scope of utility model registration request] 1. A mechanical body fixing structure in which a mechanical body is fixed to the inside of a watch case through a middle frame, wherein a middle frame made of a soft material resin has elastic partial projections vertically and axially. Is integrally molded into the body, the machine body is fitted to the inner periphery of the middle frame in order to elastically dispose the machine body, and the radial protrusion of the middle frame is formed on the inner periphery of the body side portion. In addition to the pressure contact, the upper projection in the axial direction is pressed into contact with the lower surface of the inner circumference of the upper part of the cylinder, and the upper projection of the lower axial direction is pressed into contact with the upper surface of the auxiliary ring made of a relatively hard resin aligned inside the cylinder. , A packing box is formed by the outer circumference of the side portion of the auxiliary ring and a step portion of the inner circumference of the lower surface of the body, the packing is arranged in the packing box, and the lower surface of the auxiliary ring and the packing are axially pressed. Screw the back cover with a flat inner surface onto the underside of the Machine body fixing structure of portable timepiece, characterized in that.