JPS5910634Y2 - Irregular watch case - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention is directed to an irregularly shaped wristwatch case, particularly an irregularly shaped waterproof wristwatch case that is provided with an attachment/detachment mechanism including a locking spring on the overlapping surface of the back cover and body. It is about improvement.

Conventional irregularly shaped waterproof cases have a back cover and a body that overlap in the radial direction, and a locking spring is attached to this overlapping surface to form a removable engagement mechanism.This conventional device has a good appearance. Although the design and waterproofness were achieved, the case had disadvantages such as poor processability, increased manufacturing costs, and the locking spring was prone to wear out.

[Purpose of invention]

The present invention was devised in view of the above-mentioned conventional problems, and its purpose is to provide an irregularly shaped wristwatch case that prevents the locking spring from becoming loose, has a simple structure, and is excellent in workability.

[Summary of the idea]

According to the present invention, the locking spring is fixed in the fixing groove formed in the side wall of the case back so that a part of the locking spring protrudes elastically from the fixing groove, and the protruding part of the locking spring is shaped into the case. In an irregularly shaped wristwatch case that engages a back cover and a body by removably engaging with a locking groove, the back cover is formed of hard alloy or resin, and the locking groove is locked. In order to embed and fix the bent portion formed on at least one end of the spring and prevent the locking spring from falling down, a support portion having a groove depth 2 to 3 times the spring thickness of the locking spring and a support portion of the locking spring are provided. a stopper portion protruding from the support portion at a portion facing substantially the center portion and having a groove depth approximately equal to the spring thickness of the locking spring so that the locking spring is not pressed and housed in the fixing groove more than necessary; An irregularly shaped wristwatch case is provided which is characterized by an integral shape, and this structure achieves the above object.

[Example of idea]

Preferred embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a first embodiment of the present invention, and FIG. 2 shows a cross section of a main part thereof.

The back cover 10 has a cavity 10a therein for housing a movement or a module, and has a rising portion 10b at its outer edge.

The outer end surface of the rising portion 10b is the rising portion 1 of the body 12.
2a and is overlapped in the radial direction.

The body 12 is provided with a flange portion 12b, and this flange portion 12b holds the packing 14 placed on the back cover 10 and the flange portion 16a of the watch glass 16.

The rising portion 10b of the back cover 10 has a fixing groove 1 on its outer end surface.
8 is provided, and a locking spring 20 is fixed in this fixing groove 18.

FIG. 2 shows the fixing groove 18 in detail, with the rising portion 10b
Supporting portion 18a substantially parallel to the outer end surface of Supporting portion 18a
and a stopper portion 18b projecting outward from the stopper portion 18b.

One end of the locking spring 20 is embedded and fixed in the support portion 18a.

The locking spring 20 is made of a spring wire having a circular cross section, and is machined into a hollow shape so that its central portion is curved, as shown in FIG.

The locking spring 20 has its curved portion protruding from the fixing groove 18 and is connected to the locking groove 2 provided in the rising portion 12a of the body 12.
2 and is fixed in the fixing groove 18 so as to be removably engaged with the fixing groove 18.

The support portion 18a of the fixing groove 18 has a groove depth that corresponds to the locking spring 2.
The depth of this groove is set to be two to three times the spring thickness of the locking spring 20.

Further, the stopper portion 18b of the fixing groove 18 is formed to have a groove depth that is approximately equal to the spring thickness of the locking spring 20.

The back cover 10 is manufactured by plastic molding or shaping, and can be easily formed into a predetermined shape, and since the back cover 10 is made of plastic, it is also extremely easy to cut. .

In addition, the back cover 10 has a back cover outer cover 30 formed from a thin metal plate.
The main body 32 of the camera back made of plastic material is inserted into the frame.

The end portion 30a of the case back cover 30 extends halfway to the overlapping surface of the case back 10 and case 12, and as a result, the case back main body 32 made of plastic material is completely exposed to the outside when the watch is assembled. The exterior quality of the case is exactly the same as that of a metal case, making it possible to obtain a case that is resistant to scratches.

The case back cover 30 is formed from a thin metal plate by stamping, but in the illustrated embodiment, the end portion 30a is not formed along the entire outer periphery of the case back 10, but is formed halfway there. Since the outer cover 30 is only stretched, it is possible to obtain the jacket 30 by extremely simple stamping without requiring deep drawing.

The case back cover 30 is attached to a mold (not shown), and the case back main body 32 is formed into an insert by a well-known method.

As shown in FIG. 1, the back cover 10 obtained in this manner is shaped such that the overlapping surface thereof is the surface where the back cover main body 32 formed of a plastic material is exposed.

As a result, there is an advantage that processing of the coupling mechanism such as the locking spring 20, the locking groove 22, etc. provided on the overlapping surfaces is extremely easy.

That is, in the illustrated embodiment, the fixing groove 18 that forms the coupling mechanism can be integrally formed at the same time in the insert type. The processing becomes extremely easy.

The back cover 30 is cut after the stamping process to obtain a mating surface.

At this time, a slight burr as shown by 30b in FIG.
is left in order to prevent the back cover outer cover 30 and the back cover body 32 from falling off.

Of course, the paris exposed to the outside of the jacket 30 will be removed by a subsequent polishing process.

FIG. 2 shows the back cover body 32 and the locking spring 20 in a fixed state.

In the case of a metal back cover, caulking or other means are used to hold the locking spring 20, but in this embodiment, the part of the back cover that constitutes the coupling mechanism is made of plastic material. This makes it extremely easy to fix the locking spring 20.

That is, as shown in FIG. 2, the bent portion 20a at one end of the locking spring 20 is embedded and fixed in the back cover body 32.

This embedding and fixing can be done by making a small hole in the back cover body 32 in advance and press-fitting the bent part 20a into this hole.
It is also possible to embed the bent portion 20a by ultrasonic processing.

It is desirable to provide an ultrasonic processing device with an ultrasonic output of 20 kilohertz or more.

The other end 20b of the locking spring 20 is a free end, and the fixing groove 1
It makes sliding contact with the bottom surface of 8.

It is also preferable to caulk a suitable portion of the back cover body 32 in order to retain the free end 20b of the locking spring 20 within the fixing groove 18.

The embodiment of the present invention has the above structure, and its operation will be explained below.

In the mounted state shown in FIG. 1, the locking spring 20 is
The back cover 10 and the case 12 are firmly connected by engaging the protrusion with the locking groove 22 of the case 12, and the packing 14 inserted between the case back 10 and the watch glass 16 Appropriate waterproof compression force can be applied to ensure reliable waterproofing.

Next, when disassembling the back cover 10 and the body 12, use the locking spring 20.
is pressed into the fixing groove 18 and the two are separated.

At this time, in the conventional device, since the fixing groove 18 has a relatively large groove depth at least enough to prevent the locking spring from collapsing, the locking spring is pressed into the fixing groove more than necessary, and as a result, the locking There is a drawback that the spring rapidly becomes fatigued and loses sufficient elastic force for the coupling action.

However, according to the present invention, since the fixing groove 18 is provided with the stopper part 18b that protrudes outward from the support part 18a, the locking spring 20 is not pressed from the state in which it is in contact with the stopper part 18b. The attachment/detachment action can be made possible with the minimum necessary amount of pressure, and the fatigue of the locking spring can be reliably removed.

Further, according to the present invention, one end of the locking spring 20 is bent, and this bent portion 20a is embedded and fixed in the support portion 18a of the fixing groove 18, so that the locking spring 20 can be inserted into the fixing groove. 18 is very easy to install, and the locking spring 2
The mounting strength of 0 is extremely high.

In the illustrated embodiment, the locking spring 20 is made of a round wire rod having a circular cross section, but it can also be formed of a square spring material having a rectangular cross section.

[Effect of idea]

As explained above, the present invention provides the following effects.

i Since the back cover is made of hard synthetic resin,
Excellent workability.

ii Since the amount of deformation of the locking spring during attachment/detachment operations is regulated by the stopper portion of the fixing groove, it is possible to prevent the phenomenon of fatigue.

iii Since one end of the locking spring is embedded and fixed in the groove, the mounting strength of the locking spring is excellent.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the irregularly shaped wristwatch case according to the present invention, and FIG. 2 is a sectional view taken along line II-II in FIG. 10...Back cover, 12...Body, 18...Fixing groove, 1
8a...Support part, 18b...Stopper part, 20.
...Latching spring, 20a...Bending portion, 22...Latching groove.

Claims (1)

[Scope of utility model registration request] A locking spring is fixed in a locking groove formed in the side wall of the camera back so that a part of the locking spring protrudes elastically from the locking groove, and the protruding portion of the locking spring is fixed in a locking groove formed in the case. In the irregularly shaped watch case that connects the case back and the body by releasably engaging with the case, the case back is formed of hard synthetic resin, and the fixing groove is formed at least at one end of the locking spring. A supporting part having a groove depth 2 to 3 times the spring thickness of the locking spring to embed and fix the folded bent part and prevent the locking spring from collapsing, and a part facing approximately the center of the locking spring. and a stopper part that protrudes from the support part and has a groove depth approximately equal to the spring thickness of the locking spring so that the locking spring is not pressed into the fixing groove more than necessary. A uniquely shaped watch case.