JPH0752629Y2 - Small watch - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a small timepiece such as a wristwatch.

[Technical background of the invention and its problems] Generally, this kind of analog type small timepiece is constructed by assembling each functional part of the timepiece into the main plate to assemble the timepiece main body and housing the timepiece main body in the case. There is. The main plate of the watch body is made of a highly rigid material, so it is difficult to store the watch main body in the case by elastically contacting the outer peripheral surface of the main plate with the inner peripheral surface of the case. Therefore, in the past, a cylindrical inner frame formed of an elastically deformable material was attached to the outer periphery of the main plate, and this inner frame was elastically contacted with the inner peripheral surface of the case. It prevents rattling of the main body and absorbs the gap of the dimensional tolerance between the outer diameter of the main plate and the inner diameter of the case.

However, in the conventional configuration in which the middle frame is arranged on the outer periphery of the main plate as described above, twice the thickness of the middle frame is added to the outer diameter dimension of the entire timepiece, and as a result, the timepiece becomes larger. There was a drawback that

[Purpose of device]

This invention was made with this point in mind, and its purpose is to prevent rattling of the watch body and absorption of gaps in dimensional tolerances while suppressing an increase in the outer diameter of the watch. It is to provide a small timepiece capable of achieving the above.

[Outline of device]

In order to achieve the above-mentioned object, the present invention forms a plurality of recesses on the outer peripheral surface of the main plate of the timepiece main body, and a ring portion for supporting the lower side of the timepiece main body in a synthetic resin middle frame and the upper end surface of this ring portion. A plurality of protrusions that are provided so as to project in the concave portion of the main plate and are elastically pressed against the inner peripheral surface of the case.

[Example of device]

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

A first embodiment is shown in FIGS. 1 and 2, in which 1 is a watch body, 2 is a case, 3 is a back cover, and a glass 2a on the upper surface of the case 2 is attached. The timepiece main body 1 is constructed integrally by incorporating functional parts (not shown) of the timepiece inside the main plate 4 and attaching a dial 5 and a pointer 6 on the upper surface side. The winding stem 1a for manual operation of the pointer 6 is slidably projected from a part of the outer peripheral surface of the main plate 4. The base plate 4 is formed of a material having high rigidity such as metal or high-rigidity plastic, and has a stepped portion 7 recessed inwardly in substantially the lower half portion of the outer peripheral surface. The stepped portion 7 constitutes a machine drop surface 8. There is. And on the outer peripheral surface of the main plate 4,
For example, three recesses 9 ... Are evenly cut out so as to be continuous with the step 7.

A middle frame 10 is interposed between the outer peripheral surface of the main plate 4 and the inner peripheral surface of the case 2, and the middle frame 10 is integrally formed of, for example, synthetic resin, and includes a ring portion 11 and the ring portion 11. The recess 9 is formed on the upper end surface.
, And the dowels 13 are provided on the outer surfaces of the protrusions 12 ..., respectively. The annular portion 11 is arranged on the stepped portion 7 of the main plate 4 and the protrusions 12 are also arranged on the concave portion 9 by fitting the outer peripheral surface of the middle frame 10 and the outer peripheral surface of the main plate 4. Are held substantially flush with each other, and in this state, the dowels 13 of the protrusions 12 are elastically pressed against the inner peripheral surface of the case 2, and the pressure contact prevents rattling of the timepiece body 1. Further, the gap between the outer diameter of the base plate 4 and the inner diameter of the case 2 and the dimensional tolerance is absorbed. Since the timepiece body 1 tends to rattle in the sliding direction as the winding stem 1a slides, one protrusion of the middle frame 10
It is even more preferable to dispose 12 at a portion facing the sliding direction. Further, the vertical movement of the watch body 1 is caused by the mechanical falling surface 8 of the main plate 4 and the ring portion of the middle frame 10.
Blocked by contact with the upper surface of 11.

3 and 4 show a second embodiment of the present invention,
The dowels 13a are integrally formed on the inner surfaces of the recesses 9 of the main plate 4, and the outer surfaces of the protrusions 12 of the middle frame 10 are flat. Then, as shown in FIG. 4, the protruding portion 12 of the middle frame 10 is
By contacting 13a, the protrusion 12 is deformed so as to be elastically curved, and by this deformation, the protrusion 12 is elastically pressed against the inner peripheral surface of the case 2, and by this pressure contact, the same as in the first embodiment. In addition, rattling of the timepiece body 1 is prevented, and the gap of the dimensional tolerance between the outer diameter of the main plate 4 and the inner diameter of the case 2 is absorbed.

In both the first and second embodiments, the middle frame
10 is arranged so as to be substantially flush with the outer peripheral surface of the main plate 4, so that the thickness of the middle frame 10 does not add to the outer diameter dimension of the timepiece, and therefore the timepiece can be made compact. .

[Effect of device]

As described above, according to the present invention, a plurality of recesses are formed on the outer peripheral surface of the main plate of the timepiece main body, and the ring portion that supports the lower side of the timepiece main body in the synthetic resin middle frame and the upper end surface of the ring portion are formed. By forming a plurality of protrusions that are placed in the recesses of the main plate and are elastically pressed against the inner peripheral surface of the case, rattling of the watch body is prevented, and the dimensional tolerance between the outer diameter of the main plate and the inner diameter of the case is reduced. Since the gap is absorbed, there is an effect that a small timepiece can be configured while suppressing an increase in the overall outer diameter dimension of the timepiece due to the thickness of the middle frame.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention, FIG. 2 is a perspective view showing a disassembled state of a timepiece body and a middle frame, and FIG. 3 is a timepiece showing a second embodiment of the present invention. FIG. 4 is a perspective view of a disassembled state of the main body and the middle frame, and FIG. 1 ... Watch body, 2 ... Case, 4 ... Main plate, 9 ... Recessed portion, 10 ...
Middle frame.

Claims (1)

[Scope of utility model registration request] 1. A case, a timepiece main body which incorporates functional parts of a timepiece of a main plate and is housed in the case, and a synthetic resin interposed between the main plate of the timepiece main body and the case. A plurality of recesses are formed on the outer peripheral surface of the main plate, and the middle frame has a ring portion supporting the lower side of the timepiece main body, and the ring portion protruding from the upper end surface of the ring portion. A small timepiece having a plurality of protrusions which are arranged in a concave portion of the main plate and elastically press-contact with the inner peripheral surface of the case.