JP2006258720A - Mounting structure of back cover of watch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure of a back cover of a watch, capable of obtaining assured water-proof without lowering of workability and distortions of the back cover by repetitious processes, fitting and separating. <P>SOLUTION: The mounting structure of a back cover of the watch is formed, with at least a dimple section 8a of the back cover 8 of a superelastic material of superelastic alloy, composed mainly of Ti, Ni-Ti, Ni-Ti-Co, Ni-Ti-Fe, or Ni-Ti-Cr. The back cover 8 is mounted on a watch case 10, by pushing the dimple section 8a into the watch case 10 to engage in an engaging section 10a. Thus, when the back cover 8 or the dimple section 8a is formed with the superelastic material, the dimple section 8a is elastically deformed within a fixed stress. As a result, the back cover 8 will not deform, even if the back cover 8 is opened and closed repeatedly. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a watch back cover mounting structure for attaching a back cover to a watch case by fitting a dowel portion of the back cover to the watch case, and in particular, the back cover is deformed even when the back cover is opened and closed repeatedly. It's about things you don't have.

As a structure for attaching the back cover to the watch case so that it can be freely opened and closed, a number of products have been commercialized, such as providing a screw portion on the back cover and screwing it into the watch case. Among them, the structure that attaches the back cover to the watch case by providing the dowel part on the back cover and fitting this dowel part to the fitting part of the watch case makes it easy to attach the back cover and secure waterproofing Structures can be formed and are widely used.
However, in this structure, it is necessary to push in the dowel part that is larger than the inner diameter of the watch case at the time of fitting. In some cases, warping may occur, resulting in a decrease in waterproofness.

Therefore, a back cover mounting structure as shown in FIG. 6 has been proposed. In this case attachment structure, the case 2 is provided with a core 4 (dash-and-dash line shape) having a substantially L-shaped cross section made of a shape memory alloy, and the case 2 is assembled with the case 2 and then heated. Thus, the core 4 is deformed into a memory shape (solid line shape) having a substantially S-shaped cross section, and is joined so as to bite into the watch case 6. Thereby, it can be assembled without difficulty and can be attached without a gap (see Patent Document 1).
However, in this structure, it is necessary to heat or cool the watch case 6 and the back cover 2 at the time of fitting, and there is a problem that the assembling work becomes complicated.
Japanese Utility Model Publication No. 63-157688

  An object of the present invention is to solve the above-mentioned problems, and to provide a watch back cover mounting structure capable of obtaining a certain waterproof property without deteriorating the back cover even if repeatedly fitted and detached without deteriorating workability. It is to provide.

The timepiece back cover mounting structure of the present invention is a timepiece back cover mounting structure in which a back case dowel part is fitted into a watch case, and at least the dowel part of the back cover is formed of a superelastic material. . The watch case has a fitting portion into which the dowel portion of the back cover is fitted, and at least the fitting portion is formed of the superelastic alloy. The superelastic material is titanium (Ti), nickel-titanium (Ni-Ti), nickel-titanium-cobalt (Ni-Ti-Co), nickel-titanium-iron (Ni-Ti-Fe) or nickel-titanium- It consists of a super elastic alloy which has chromium (Ni-Ti-Cr) as a main component.
The watch case is made of stainless steel, (pure) titanium, or a titanium alloy.

  According to the present invention, since the dowel portion of the back cover is formed of a superelastic material, the dowel portion is sufficiently elastically deformed within a certain stress when the back cover is fitted and removed. As a result, an excessive force is not applied to the watch case and the back cover to damage the watch case, and the dowel part is deformed and the back cover is not warped. As a result, the watch case and the back cover are always fitted with high precision, and the occurrence of poor waterproofing can be prevented.

  Further, in the case of the back cover fitting / removal in the present invention, it is not necessary to heat or cool the watch case or the back cover.

  In the back cover mounting structure of the watch of the present invention, at least the dowel part of the back cover is a super elastic alloy mainly composed of Ti, Ni-Ti, Ni-Ti-Co, Ni-Ti-Fe or Ni-Ti-Cr. It is made of a super elastic material such as The back cover is attached to the watch case by pushing the dowel portion into the watch case and fitting it into the fitting portion in the watch case. In this way, by forming at least the dowel part of the back cover with a superelastic material, the dowel part elastically deforms within a certain stress when the back cover is opened and closed. There is no deformation.

  1 is a cross-sectional view showing a back cover mounting structure for a timepiece according to Embodiment 1 of the present invention. Reference numeral 8 denotes a back cover, which has a dowel portion 8a rising from an inner step portion of an edge portion 8b around the back cover. The dowel portion 8 a is formed in a ring shape along the outer periphery of the back cover 8, or a plurality of dowel portions 8 a are formed. Further, the dowel portion 8 a has a substantially U-shaped cross-sectional shape that protrudes outward in the radial direction, and the protruding portion is set to have a diameter larger than the inner diameter of the watch case 10. . Further, a ring-shaped concave portion 8 c facing the rear surface direction end surface 10 b of the watch case 10 is provided on the edge portion 8 b of the back cover 8. A packing 12 such as an O-ring is accommodated in the recess 8c. The packing 12 is compressed between the case back 8 and the watch case 10 to form a waterproof structure.

  The watch case 10 is provided with a concave fitting portion 10a formed in a ring shape or partially on the inner wall portion 10c thereof. The fitting portion 10 a is provided at a position corresponding to the dowel portion 8 a of the back cover 8.

  Further, the back cover 8 in this embodiment is entirely made of a superelastic material. As this superelastic material, titanium (Ti), nickel-titanium (Ni-Ti), nickel-titanium-cobalt (Ni-Ti-Co), nickel-titanium-iron (Ni-Ti-Fe) or nickel-titanium -A superelastic alloy mainly composed of chromium (Ni-Ti-Cr) is used.

  The back cover 8 having the above configuration is attached to the watch case 10 by pushing the dowel portion 8 a into the watch case 10. At this time, the dowel portion 8a is pressed radially inward by abutting against the back surface direction end of the inner wall portion 10c of the watch case 10 and elastically deforms. When the dowel portion 8a reaches the fitting portion 10a of the watch case 10, the original state is restored. It returns and engages with the corner | angular part etc. of the fitting part 10a. Thus, the back cover 8 is attached to the watch case 10 by fitting the dowel part 8a and the fitting part 10a. Further, when removing the back cover 8, a tool or the like is inserted between the end face 10 b of the watch case 10 and the edge 8 b of the back cover 8 to open the back cover 8. At this time, the dowel portion 8a is again elastically deformed radially inward by coming into contact with the rear surface direction end of the inner wall portion 10c of the watch case 10 and is released as it is when the back cover 8 is removed. become.

  As described above, when the back cover 8 is opened and closed, the dowel portion 8a is pushed and elastically deformed by the inner wall portion 10c of the watch case 10, but in this embodiment, the back cover 8 is made of a super elastic material. Even if the dowel portion 8a is repeatedly opened and closed, it is not plastically deformed even if it is elastically deformed. Further, since the entire back cover 8 can be elastically deformed, even if an excessive force is applied to the back cover 8, the back cover 8 is not plastically deformed and warped. For this reason, the recess 8c is not deformed or displaced, and the packing 12 can be sufficiently compressed to ensure a certain waterproof property.

  2 to 4 are sectional views showing a back cover in the back cover mounting structure for a timepiece according to Embodiment 2 of the present invention. In the present embodiment, the back cover 18 is formed of stainless steel, titanium, or a titanium alloy, and the dowel portion 18a is a superelastic material. In this embodiment, titanium (Ti), nickel-titanium (Ni-Ti), nickel-titanium. -It is formed of a superelastic alloy mainly composed of cobalt (Ni-Ti-Co), nickel, titanium, iron (Ni-Ti-Fe) or nickel, titanium, chromium (Ni-Ti-Cr).

The dowel portion 18 a shown in FIG. 2 has a back surface side end portion 18 d that is straight, and this end portion 18 d is fixed to a vertical surface of a step portion 18 e inside the edge portion 18 b of the back cover 18. Moreover, the edge part 18b is provided with the intermediate | middle step part 18c in the outer side of the step part 18e, and the recessed part which accommodates packing is formed by the inner side being blocked by the dowel part 18a. Further, the dowel portion 18a shown in FIG. 3 has a substantially reverse L-shape in which the back surface direction end portion 18f is fitted to the step portion 18e, and has a larger joint surface with the inner surface 18g of the back cover 18. Further, the dowel portion 18a shown in FIG. 4 has a substantially L-shape in which the back surface direction end portion 18h fits the intermediate step portion 18c, and a packing is placed on the end portion 18h. The watch case in the second embodiment is the same as that in the first embodiment.
For joining the back cover 18 and the dowel 18a, it is preferable to use any one of brazing, adhesion, welding, and diffusion joining, but this is not restrictive.

  Even if only the dowel portion 18a is formed of a superelastic material as in the present embodiment, the dowel portion 18a is sufficiently elastically deformed when the back cover 18 is opened and closed as in the first embodiment, and the back cover 18 is It can be opened and closed repeatedly without plastic deformation. Further, the back cover 18 can be formed of the same material (stainless steel, (pure) titanium, titanium alloy, etc.) as the watch case 10, and the appearance quality can be improved.

  FIG. 5 is a cross-sectional view showing a watch case in a watch back cover mounting structure according to Embodiment 3 of the present invention. An annular or partially formed step portion 20d is provided at the rear surface direction end of the inner wall portion 20c of the watch case 20. An inner body portion 20e made of a superelastic material is attached in the step portion 20d. Further, a concave fitting portion 20a is provided on the inner surface of the inner body portion 20e. The superelastic material in this example is titanium (Ti), nickel-titanium (Ni-Ti), nickel-titanium-cobalt (Ni-Ti-Co), nickel-titanium-iron (Ni-Ti-Fe), or nickel. A superelastic alloy mainly composed of titanium / chromium (Ni—Ti—Cr) is used. In addition, the back cover in this Example 3 uses the same thing as Example 1 and 2. FIG.

As in the present embodiment, not only the back covers 8 and 18 and the dowel portions 8a and 18a but also the fitting portion 20a of the watch case 20 is formed of a super elastic material, so that the dowel portions 8a and 18a and the fitting portion 20a are formed. When they are fitted, they are made of the same material, so that the affinity between the parts is improved and the parts can be firmly bonded.
The inner body 20e and the watch case 20 are preferably joined by brazing, bonding, welding, or diffusion bonding, but this is not restrictive.
Of course, it goes without saying that the entire watch case 20 may be formed of a superelastic material.

  The timepiece back cover mounting structure of the present invention attaches the back cover to the timepiece case, but can also be used for fitting parts such as an outer case and an inner case, a watch case and a bezel.

It is sectional drawing which shows the back cover attachment structure of the timepiece which concerns on Example 1 of this invention. It is sectional drawing which shows the back cover in the back cover attachment structure of the timepiece which concerns on Example 2 of this invention. It is sectional drawing which shows the other back cover in the back cover attachment structure of the timepiece which concerns on Example 2 of this invention. It is sectional drawing which shows the other back cover in the back cover attachment structure of the timepiece which concerns on Example 2 of this invention. It is sectional drawing which shows the timepiece case in the back cover attachment structure of the timepiece which concerns on Example 3 of this invention. It is sectional drawing which shows the conventional back cover attachment structure.

Explanation of symbols

2, 8, 18 Back cover 4 Core 6, 10, 20 Watch case 8a, 18a Dowel portion 8b, 18b Edge portion 8c Recessed portion 10a, 20a Fitting portion 10b Back surface direction end surface 10c, 20c Inner wall portion 18c Intermediate step portion 18d, 18f, 18h Rear end 18e Step 18g Inner surface

Claims (4)

In the watch back cover mounting structure that fits the dowel part of the back cover to the watch case,
At least a dowel portion of the back cover is formed of a super elastic material. The timepiece case back cover according to claim 1, wherein the timepiece case has a fitting portion into which a dowel portion of the case back is fitted, and at least the fitting portion is formed of a superelastic material. Mounting structure. The superelastic material is titanium (Ti), nickel-titanium (Ni-Ti), nickel-titanium-cobalt (Ni-Ti-Co), nickel-titanium-iron (Ni-Ti-Fe) or nickel-titanium- 3. The timepiece back cover mounting structure according to claim 1, wherein the watch back cover mounting structure is made of a superelastic alloy mainly composed of chromium (Ni-Ti-Cr). The timepiece case cover mounting structure according to any one of claims 1 to 3, wherein the watch case is made of stainless steel, (pure) titanium, or a titanium alloy.

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