JPH06273543A - Cover structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent deformation of elastic shock absorbers for impact relaxation. [Structure] A slit 20 is formed in a timepiece module 5 housed in a timepiece case 1. Clock module 5 and back cover 13
An elastic shock absorber 12 for shock absorption is provided between the elastic shock absorber 12 and the back cover 13 and a rotation lock member 23 is provided between the elastic shock absorber 12 and the back cover 13. The engagement piece 24 of the rotation lock member 23 has the elastic impact body 1
Since it penetrates through 2 and engages with the slit 20 of the timepiece module 5, the elastic cushioning body 12 is prevented from following the rotation when the case back is rotated and its deformation is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lid structure having an impact resistant structure.

[0002]

2. Description of the Related Art In a shock resistant wrist watch, an elastic shock absorbing body which absorbs and attenuates shock and absorbs shock is incorporated in a watch case. This elastic impact body is generally provided so as to be located between the watch case and the watch module incorporated in the case, and between the watch module and the back cover on the back side of the watch case. It prevents external shocks of the same size from being transmitted to the timepiece module.

On the other hand, not only impact-resistant wristwatches but also general wristwatches need to ensure the airtightness of the back side of the watch case. Therefore, the back cover is attached by screwing. That is, the back side of the watch case and the outer peripheral surface of the back cover corresponding to this back side are formed with screw parts that are screwed into each other, and are mounted on the watch case by rotating the back cover.

[0004]

However, when the structure in which the back cover is attached by screwing is applied to an impact resistant wristwatch, the elastic cushion provided on the back side of the watch case is used when the back cover is attached. It has a disadvantage that it is deformed by rotation and the impact cannot be alleviated.

The present invention has been made in consideration of the above circumstances, and even if the back cover is attached by screwing, the elastic cushioning body is not deformed, so that reliable shock absorption can be achieved. It is an object to provide a lid structure that can be performed.

[0006]

In the lid structure of the present invention, a lid body formed with a screw portion to be screwed with the case and attached to the case, and a slit is formed on a surface facing the lid body, the inside of the case being formed. A module to be housed, an elastic buffer provided between the module and the lid, and an engaging piece penetrating the elastic buffer and engaging with a slit of the module, the elastic buffer and the lid. And a rotation lock member provided between the body and the body.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a front view of an embodiment of the present invention, and FIG. 2 is a back cover and an elastic shock absorber 12 and a circuit lock member 23 which will be described later.
The rear view when removing is shown. A display unit 2 for digitally displaying the time and other information is provided on the upper surface of the watch case 1, and a bezel 3 for providing decoration is provided around the display unit 2. A button switch 4 is provided on the side surface of the watch case 1 for changing the contents displayed on the display unit 2, correcting the time, and setting the alarm time. The timepiece case 1 has an opening on the back side, and an opening on the back side communicates with a storage section 6 for inserting and storing the timepiece module 5 (see FIG. 3).

FIG. 3 shows the internal structure of the watch case 1. A dial 2a as a display unit 2 and a watch glass 2b are provided on the upper part of the watch case 1, and the watch module 5 is provided.
Is inserted into the watch case 1 from the back side. The timepiece module 5 is an electronic circuit module in which various components such as a circuit board for controlling display contents and other controls and a battery for supplying electric power to the circuit board are assembled and set in the timepiece case 1. In this case, these parts are assembled to the housing 7 made of synthetic resin, and after the assembly, a mounting plate 8 (see FIG. 2) such as a metallic bottom plate is engaged with the housing 7 to assemble the components. Is retained.

This embodiment shows an application to a wrist watch having an impact resistant structure, and therefore an elastic impact body for cushioning the timepiece module 5 from an impact is provided in the timepiece case 1. In FIG. 3, 10 is an elastic cushioning body on the case side provided between the timepiece module 5 and the timepiece case 1, which is made of soft plastic. The timepiece module 5 is fitted into the elastic cushioning body 10 on the case side via a spacer 11 made of hard plastic to protect it from an impact from the timepiece case side. Reference numeral 12 denotes a lid-side elastic impact body made of soft plastic provided between the back cover 13 and the timepiece module 5.
Provide protection against side impact. The lid-side elastic impact body 12 is formed in a plate-like ring shape, and its rotation is stopped by the structure described later.

The back cover 13 is mounted on the watch case 1 by screwing. For this reason, the threaded portion 14 is formed on the inner surface of the back side of the timepiece case 1 corresponding to the back lid 13, and the threaded portion 15 screwed to the threaded portion 14 is formed on the back lid 13. A flange portion 13a is formed on an outer portion of the screw portion 15 of the back cover 13, and the timepiece case 1 facing the flange portion 13a is formed.
A packing 16 is provided on the outer peripheral portion of the back surface of the watch case 1 to maintain the airtightness of the back side of the watch case 1. 17 is the back cover 13
The piezoelectric element is attached to the circuit board by adhesion or the like, and is electrically connected to the circuit board by an elastic member (not shown) to notify an alarm.

Next, the rotation preventing structure of the elastic cushioning body 12 on the lid side will be described. In FIG. 3, reference numeral 20 denotes a slit formed on the surface of the housing 7 of the timepiece module 5 facing the back cover 13. As shown in FIG. 2, the slits 20 are formed at two symmetrical positions of the housing 7. On the other hand, a communication hole 21 is formed in a portion of the elastic cushioning body 12 on the lid side that faces the slit 20 of the housing 7. Further, a rotation lock member 23 is arranged between the elastic impact body 12 on the lid side and the back lid 13. The rotation lock member 23, as shown in FIG.
Although formed in a ring shape having the same shape as 2, the engaging piece 24 is formed by partially bending the portion of the housing 7 facing the slit 20. This engagement piece 2
As shown in FIG. 3, reference numeral 4 penetrates through the communication hole 21 of the elastic cushioning body 12 on the lid side, is inserted into the slit 20 of the housing 7, and is engaged therewith. As a result, the rotation lock member 23 is connected to the timepiece module 5 and its relative rotation is prevented.

In such a structure, the elastic cushioning body 1 on the lid side
The rotation lock member 23 is provided between the back cover 13 and the back cover 13, and the rotation lock member 23 is fixed by the slit 20 of the timepiece module 5. Therefore, when the back cover 13 is rotated and detached, the rotation force is applied to the lock member 23. Even if added, the elastic cushioning body 12 on the lid side does not rotate following the back lid 13 because the lock member 23 does not rotate. As a result, the elastic cushioning body 12 on the lid side is not deformed, and a good shock absorbing action can be maintained. 3 and 4, reference numeral 25 denotes elastic protrusions formed on the lid-side elastic cushioning body 12, and by contacting the rotation lock member 23, the lid-side elastic cushioning body 12 and the rotation lock member 2 are provided.
Prevent full contact with 3. In the above embodiment, the engagement piece 24 of the lock member 23 is adapted to engage with the slit 20 of the housing 7 through the communication hole 21 of the elastic buffer body 12. Instead of providing the communication hole, the lock member 23 may have a shape different from that of the elastic shock absorber 12, and the elastic shock absorber 12 may be penetrated at a position avoiding the elastic shock absorber 12 to engage with the slit. Further, the present invention is not limited to wristwatches, but can be applied to all electronic devices using a rotation-mountable lid.

[0013]

As described above, according to the present invention, since the elastic shock absorber provided between the electronic circuit module and the lid is put into the rotation lock state by the rotation lock member, even if the lid is rotated, the elastic shock absorber is kept. As a result, the elastic cushioning body can be prevented from being deformed and the impact can be satisfactorily mitigated without rotating following it.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the present invention.

FIG. 2 is a back view of the embodiment.

FIG. 3 is a partial cross-sectional view of one embodiment.

FIG. 4 is a front view of a rotation lock member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Watch case 5 Watch module 7 Housing 12 Elastic buffer body on the lid side 13 Back cover 20 Slit 23 Rotation lock member 24 Engaging piece

Claims (4)

[Claims] 1. A lid body formed with a threaded portion to be screwed into the case and attached to the case, an electronic circuit module having a slit formed in a surface facing the lid body and housed in the case, and the electronic circuit. An elastic shock absorber provided between the module and the lid, and an engagement piece that engages with the slit of the electronic circuit module via the elastic shock absorber are provided between the elastic shock absorber and the lid. And a rotation lock member that is locked. 2. A back cover having a threaded portion which is screwed with the back side of the watch case and attached to the watch case, and a timepiece module having a slit formed on a surface facing the back cover and housed in the watch case. An elastic shock absorber provided between the timepiece module and the back cover, and an engagement piece penetrating the elastic shock absorber to engage with a slit of the timepiece module. A lid structure comprising a rotation lock member provided therebetween. 3. The lid structure according to claim 1, wherein the elastic cushioning body is formed with a plurality of elastic projections that come into contact with the circuit lock member. 4. The lid structure according to claim 2, wherein the elastic cushioning body is formed with a plurality of elastic projections that come into contact with the circuit lock member.