JPH0137714B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to the structure of a waterproof case for a portable watch having a non-circular parting shape.

In this type of watch case, the inventor of the present invention
This was previously proposed in Publication No. 55-37937. That is, as shown in FIG.
are integrated. The core 2 has a flange portion extending radially outward from its upper periphery, and an engaging protrusion 2d is formed from a portion of the flange. On the other hand, an engagement groove 1a is carved in the barrel 1 at a position corresponding to the engagement protrusion 2d. Also, core 2
The outer edge flange shape is made to have a clearance with the inner shape of the body 1, and the engagement protrusion 2
d and the engagement groove 1a are each formed so that h ₂ > h ₁ , so that the back cover 4 can move relative to the case 1 in the direction of the engagement axis (in the direction of arrows A and B). There is.
However, by inserting an elastic packing 8 into a space surrounded by the abutting surface of the back cover 4 with the body, the outer circumferential surface of the core 2, the lower surface of the flange, and the inner circumferential surface of the body 1, It not only regulates the movement of A←→B, but also serves as a waterproof gasket. When opening and closing the back cover, inserting the locking tool 10 into the locking part 4a and pushing in the direction of arrow A causes the gasket 8 to elastically deform and the engagement protrusion 2d to disengage from the engagement groove 1a, releasing the engagement. Ru. Note that 3 is a windshield glass, and 4 is a waterproof gasket next to the glass. As described above, the structure of the prior application is clear in principle, provides extremely reliable engagement force and waterproof performance, and is extremely useful in practice. However, as explained above, in order for the back cover 4 to be movable in the direction of the engagement axis A←→B with respect to the case 1, the height _h2 of the engagement protrusion and the height _h1 of the engagement groove must be extremely set. It was necessary to process each part strictly within a tolerance of about ±3, and to satisfy h ₂ > h ₁ . Furthermore, if h ₂ is too large compared to h ₁ , a gap will appear between the abutment surface of the case back and the case, resulting in an unsightly appearance, and at the same time, the contact length of the seal 8 with the case will be shortened. This would also have a negative impact on waterproof performance, which required the strictest manufacturing controls and became a bottleneck in the process.

On the other hand, with a case structure in which a waterproof gasket is inserted into the joint between the case and the back cover and engaged with a dowel (including an engaging protrusion), the waterproof gasket is likely to be cut if the locking tool accidentally slips when tightening the case. Although it has some drawbacks, it was not completely solved even in the above-mentioned prior application.

As mentioned above, the present invention is intended to solve the drawbacks and unresolved problems of the prior application.

FIG. 2 shows the case structure of the present invention.

The core 2 is integrated with the back cover of 4 by brazing. The core 2 and the back cover 1 may be machined from a single piece. Similar to the conventional embodiment shown in FIG. 1, the core 2 has a flange directed toward the upper outer periphery, and an engaging protrusion 2d is formed from a portion of the flange.
Furthermore, an engagement groove 1a is carved in the barrel 1 at a position corresponding to the engagement protrusion. Also, similar to the conventional embodiment shown in FIG. 1, a clearance is provided between the outer shape of the core flange, the outer shape of the back cover, and the inner shape of the barrel.
It is movable in the direction of the engagement axis (A←→B). Furthermore, a gasket 8 with elastic restoring force is inserted into the space consisting of the outer periphery of the core, the lower surface of the core flange, the upper surface of the outer periphery of the back cover, and the inner surface of the case, and serves to restrict the movement in the direction of the engagement axis and at the same time serve as waterproofing. Also serves as. The major difference from Fig. 1 is that in Fig. 1, the outer diameter of the back cover is larger than the inner diameter of the case, but in the embodiment of the present invention, the outer diameter of the back cover is smaller than the inner diameter of the case.
Also, the contact surface of the back cover is deeper than the bottom of the case. To open and close the back cover, push the back cover 4 in either direction A←→B, and the engagement protrusion 2d will disengage from the engagement groove 1a and the engagement will be released. Ru. This is basically the same as the embodiment shown in FIG. 1 of the prior application, but in FIG.
a and pushed it in the direction of arrow A, but in the present invention, as shown in FIG.
Insert it into the gap W between the inner surface and the outer surface of the case back 1, and use the inner surface of the case 1 as a lever to move the case back in the moving direction (A
When the locking tool 10 is tilted in the opposite direction (direction B), the back cover moves in the A direction by the lever principle as shown in Fig. 2b, and as a result, the gasket 8 is pushed and engaged. The protrusion 2d is removed from the engagement groove 1a and the engagement is released. Here, the conditions of the engaging portion will be explained in more detail with reference to FIG.

Figure 3b shows the back cover 4, core 2, flange part 2c,
It is a perspective view, partially in section, showing the structure of the back cover including the engagement protrusion 2d (excluding the gasket). Furthermore, Figure 3a
As shown in , the hooking part W ₁ between the engagement protrusion 2 d and the engagement groove 1 a is the gap W ₂ between the inner surface of the case and the outer surface of the back cover.
The depth W ₃ of the engagement groove is set to be larger than twice W ₁ . That is, W ₂ > W ₁ , W ₃ >
A relationship of 2×W ₁ is required.

As described above, according to the case structure of the present invention, the locking tool is inserted into the gap W and the back cover is moved and disengaged using the lever principle, so it can be opened reliably with a small force, unlike the conventional case. There is no longer any danger of damaging Patsukin during Kojiake.

Additionally, since only horizontal force acts on the back cover from the sides, the back cover does not deform when it is pressed, making it possible to use a thin plate back cover. Further, the processing positional accuracy of the engaging protrusion 2d and the engaging groove 1a does not need to be very precise because there is no abutment surface where the lower surface of the case and the upper surface of the camera back overlap as in the conventional case. This makes it easier to process and provides more stable waterproof performance.

FIG. 4 and the following are other embodiments of this embodiment.

FIG. 4 shows an embodiment in which the back cover 4 is not a mere flat plate but has a constricted plate-like back cover, which is suitable for cases where the movement to be placed inside the case is thick.

FIG. 5 shows another embodiment of the cover part of the camera back 4.
There is a hook hook groove 4 on the outer surface of the camera back.
It is engraved with c. This is Kojiake tool 1
This makes it easy to remove the back cover 4 from the inside of the case 1 after pressing the back cover with 0. Even without this groove, the back cover would still float up due to the repulsive force from the movement inside, but this makes it more reliable. FIGS. 6a and 6b are plan views of the engagement between the case 1 and the back cover 4, viewed from the back cover side. Since the gap W into which the Kojiake tool is inserted is usually narrow, it may be difficult to insert the Kojiake tool. For this purpose, a bulge is provided on the body or back cover to also serve as an indication of the position where the Kojiake tool is inserted. FIG. 6a is a diagram showing the inside surface of the body 1 with a sill attached. FIG. 6b shows a view of the back cover 4 with a bulge attached to its outer surface.

[Brief explanation of drawings]

Fig. 1... A sectional view showing the embodiment of the prior application, Fig. 2 a, b... An assembled sectional view showing the structure and operation of the present invention, Fig. 3 a... A partial sectional view showing the engaging part of the present invention. Figure 3b: A partially sectional perspective view showing the structure of the back cover of the present invention, Figure 3c: An overall sectional view showing the structure of the present invention corresponding to Figure 3a, Figure 3 d...Another overall sectional view of the present invention corresponding to FIG. 3b, No. 4
The figure is a sectional view showing another embodiment of the present invention, FIG.
Fig. 6 a, b... A partial cross-sectional view and a plan view showing an embodiment of the Kojiake portion of the present invention. Symbols in the figures are common to each figure: 1...Body, 1a...Engaging groove, 2...Middle 2d...Engaging protrusion, 3...Glass side seal, 4...Back cover, 5...Windshield glass, 8...Waterproof seal, 10...Kojiake tool.

Claims (1)

[Scope of Claims] 1. The back cover is movable in the direction of the engagement axis with respect to the body of the portable watch case, and the engagement axis is fixed by a packing compressed in the radial direction between the inner surface of the case and the outer surface of the core. In the structure of a waterproof case for a mobile watch that aims to restrict directional movement and achieve waterproof performance, the back cover has a planar shape or a bowl-shaped shape with a narrowed outer periphery of a planar body, and the core is rolled into the back cover. A flange is provided that is integrated by means of attachment, adhesion, or welding and extends in an outer radial direction from the core opening edge, and a radial relative position of the flange is provided with a flange that extends further in the outer radial direction from the outer diameter of the flange. An engaging protrusion that engages with a barrel engaging groove provided on the inner wall of the projecting barrel is provided, and the outer diameter of the camera back is made smaller than the inner diameter of the barrel so that the gap W ₂ in the engagement axis direction and the barrel engage with each other. The overlap W ₁ between the groove and the engaging protrusion of the core is set so that W ₂ >W ₁ ,
A packing box is formed by the back cover, the core, the lower surface of the flange, and the inner diameter surface of the body, and the contact surface of the back cover with the packing is located at a position that is wider than the bottom surface of the body. The structure of a waterproof case for a mobile watch is characterized by: 2. The structure of a waterproof case for a portable watch according to claim 1, in which a part of the body or the back cover is provided with a bulge so as to partially widen the gap between the body and the back cover. 3. The structure of a waterproof case for a portable watch as set forth in claim 1 or 2, in which a groove is carved on the outer surface of the back cover into which a locking tool is caught.