JPS623745Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a watch, and more specifically, to the engagement between the case back and the side body.

Conventionally, the structure of a watch has been shown in FIG.

That is, a pair of engagement protrusions 2b for engagement with the body 3 are formed from a portion of the mold flange 2a that protrudes radially outward from the end periphery of the core 2, which is integrated with the back cover 1 by brazing or the like. In addition, an inner circumferential wall 3a and an engaging groove 3b are provided on the body to ensure clearance with the mold flange 2a and the engaging protrusion 2b, respectively, so that the back cover 1 and the body 3 are movable in the radial direction. At the same time, a packing 4 is arranged between the core 2 and the inner circumferential wall 3a to make the inside of the watch side watertight.

In this structure, the core 2 is usually drawn and stamped from a plate material and then joined to the back cover 1, and the processing is time-consuming because it is not integrally molded. In addition, it is difficult to integrally mold the core 2 and the back cover 1 from the same material because of the circumferential groove 2c formed by the mold flange 2a, and the only processing method is to cut the back cover in a secondary process. Particularly when the lid 1 has an irregular planar shape, it is difficult to mass-produce it.

The present invention is an attempt to solve the above-mentioned drawbacks, and includes forming a pair of engaging protrusions from a portion of the periphery of the back cover, and forming a pair of engaging protrusions from a portion of the periphery of the back cover so that the back cover and the body can move relative to each other in the radial direction. The opposing inner circumferential wall and engagement groove of the body are formed so that there is clearance from the circumferential edge and the engagement protrusion, respectively, and the packing is radially compressed between the circumferential wall formed integrally with the back cover and the inner circumferential wall of the body. This provides a watch side structure that is characterized by being watertight.

An embodiment of the present invention will be described with reference to FIGS. 2, 3, and 4.

As shown in FIG. 2, the back cover 11 has a pair of engaging protrusions 11a diagonally formed on a part of its periphery, and adjacent peripheral walls 11b are integrally formed from the same material. Processed. On the other hand, as shown in FIG. 3, the case 13 has an engaging groove 13a and an inner circumferential wall 1 so that there is a clearance at a position facing each of the engaging protrusion 11a of the back cover 11 and the circumferential wall 11b.
3b is formed.

To assemble the back cover 11 into the body 13, first attach the packing 14 to the peripheral wall 11b of the back cover 11, as shown in FIG.
After wrapping it around the outer periphery of the engaging protrusion 1 of the back cover 11
After one of the engagement protrusions 11a is pressed against and engaged with the opposing one of the engagement grooves 13a of the barrel 13, the other of the engagement protrusions 11a is engaged with the other of the engagement grooves 13a.

The size of the clearance provided between the engagement protrusion 11a and the peripheral wall 11b of the back cover 11 and the engagement groove 13a and the inner circumferential wall 13b of the case 13 is such that one of the engagement protrusions 11a of the case back 11 is 13 engagement grooves 13a
When pressed against the opposite side of the engaging protrusion 11
The other side of the engagement groove 13a is set to smoothly engage with the opposing other engagement groove 13a.

In this way, when the back cover 11 is assembled into the case 13, the packing 14 is compressed uniformly over the entire circumference between the peripheral wall 11b of the case back 11 and the inner circumferential wall 13b of the case 13 facing it, so that the case back 11 is attached to the case 13. On the other hand, since the center is exposed, both of the engaging protrusions 11a of the back cover 11 are almost evenly engaged with the engaging grooves 13a of the barrel 13, and do not come off in the natural state.

To remove the back cover 11 from the case 13, the process of assembling is reversed, and by shifting the shoulder 11c of the engagement protrusion 11a of the back cover 11 in the other direction of the engagement protrusion 11a, the engagement protrusion 11a can be removed. One comes off easily.

As described above, according to the present invention, a pair of engagement protrusions are formed on the periphery of the back cover, and the engagement protrusions are formed on the periphery of the back cover so that the back cover and the body can mutually move in the radial direction. The opposing inner circumferential wall of the body and the engagement groove are formed so that there is clearance between the protrusions and the inner circumferential wall of the case back, and the packing is radially compressed between the circumferential wall of the back cover and the inner circumferential wall of the case. The shape is simple and can be easily processed, and the back cover can be easily attached and detached from the body, so it has sufficient practical effects.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing the structure of the conventional watch side, Figure 2 is a top view showing the structure of the case back on the watch side of the present invention, and Figure 3 is a view of the back cover shown in Figure 2 on the watch side. FIG. 4 is a sectional view showing the process of assembling the back cover according to the present invention. 11... Back cover, 11a... Engaging protrusion, 11b
... Peripheral wall, 13 ... Body, 13a ... Engagement groove, 13
b...Inner peripheral wall.

Claims (1)

[Scope of utility model registration request] A ring-shaped peripheral wall is formed on the outer periphery of the back cover, and a pair of engaging protrusions are formed on a part of the peripheral wall, while a pair of engaging protrusions are formed on the inner periphery of the body on the side that engages with the back cover, corresponding to the circumferential wall of the back cover and the engaging protrusions. forming an inner circumferential wall and an engaging groove at the position, and sandwiching a packing between the circumferential wall of the back cover and the inner circumferential wall of the body;
A structure on a watch side, characterized in that a gap is provided between an engagement protrusion and an engagement groove.