JPS6221986Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a waterproof reuse device in a watch case.

The structure of a typical conventional waterproof reuse device is as shown in the cross-sectional view shown in FIG. The shaft portion 3 between
It is known to maintain waterproofness by squeezing an O-ring 4 inserted into the groove a.

In this structure, the clamping pressure of the O-ring prevents water from entering the case, but sweat, dust, and dirt can easily enter the gap S between the collar 3c of the Reuse 3 and the pipe 2, resulting in dirt clogging. There were many cases where reuses malfunctioned and could not be operated normally. Further, there is a problem in that when dust or the like adheres to the O-ring 4, the waterproof function deteriorates. moreover,
Conventional O-rings having a circular cross section tend to twist each time they slide on the inner surface of the pipe 2, which impedes waterproof performance.

The present invention aims to eliminate the above-mentioned conventional drawbacks and improve the operability and waterproofness of the reuse.

Embodiments of the present invention will be described below with reference to the drawings.
Figures 2 and 3 are examples of the present invention, and the second
The figure shows a sectional view of the reuse device, and FIG. 3 shows a partial sectional view of the O-ring.

In FIGS. 2 and 3, the same component names as in FIG. 1 are given the same reference numerals.

The pipe 2 is made of metal, has a substantially circular shape, and is fixed to the case 1. Reuse 3 is the shaft part 3
a, a head portion 3b and a collar portion 3c;
A winding stem 5 is screwed onto the inner end of a, and a cross section D is formed in the groove 3d.
A type O-ring 8 is attached. O-ring 8
As shown in FIG.
After vulcanization molding, item a is polished with a surface roughness of 6S or less to eliminate the parting line during molding. This polished top has stable contact with the pipe and can follow the movement of the shaft portion 3a, achieving a higher pressure waterproofing function. Note that the top portion 8a may be used as is if the molding condition is good.

The reuse 3 forms a recess with the head 3b and the collar 3c, and the outer half of the pipe is placed in this recess. Between the outer end 2a of the pipe 2 and the inner surface of the head 3b, a metal washer 6 and a non-metallic elastic pipe 7 are arranged in order from the pipe side. The washer 6 has a ring shape with an outer diameter smaller than the inner diameter of the collar 3c of the reuse 3 and larger than the outer diameter of the pipe 2, and an inner diameter larger than the outer diameter of the reuse 3 and smaller than the inner diameter of the pipe 2. Washer 6 when operated
One side rotates at the narrow outer end 2a of the pipe 2, and the rotation operation of the Reuse 3 becomes difficult due to twisting of the non-metallic elastic pipe 7.
This is to avoid accelerated deterioration or poor waterproofing, to obtain stable quality, and to improve pressure contact with the elastic pipe 7. By using a washer, the narrow outside of the cylindrical pipe 2 can be An elastic pipe 7 can be arranged at the end 2a. The elastic pipe 7 has an outer diameter smaller than the outer diameter of the washer and larger than the inner diameter, and is further compressed between the head 3b and the washer 6 and has a swollen middle part, which prevents sweat, dirt, and dust from coming from the outside. etc. are prevented from entering.

With the above structure, the present invention can always prevent dirt, dust, etc. from entering from the outside even when the reuse is pivoted or rotated, and the rotation of the reuse is smooth and the non-metallic elastic pipe The lifespan of the product is also extended and stable quality can be obtained. Furthermore, since the elastic pipe is placed in a small space between the outer end of the pipe and the head of the reuse, it can be made as large as a conventional reuse device. Furthermore, by employing the D-type O-ring, the waterproofness, together with the function of the above-mentioned elastic ring, was dramatically improved, making it possible to obtain an excellent reuse device.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional reuse device, FIG. 2 is a sectional view of a reuse device of the present invention, and FIG. 3 is a partial sectional view of an O-ring of the present invention. 1... Case, 2... Pipe, 3... Reuse, 3a... Shaft, 3b... Head, 3c... Collar, 3d... Groove, 4, 8... O-ring, 5... Winding stem , 6... washer, 7... elastic pipe.

Claims (1)

[Scope of utility model registration request] In a waterproof reuse device in which a reuse with an O-ring having a D-shaped cross section arranged in a groove of the shaft is inserted into a cylindrical pipe and the O-ring is compressed on the inner circumference of the pipe,
Between the inner surface of the head of the reuse and the narrow outer end of the pipe, there is a ring-shaped ring having an outer diameter smaller than the inner diameter of the brim of the reuse, larger than the outer diameter of the pipe, and an inner diameter larger than the outer diameter of the shaft of the reuse and smaller than the inner diameter of the pipe. A washer and a non-metallic elastic pipe smaller than the outer diameter and larger than the inner diameter of the washer are disposed, one end of the non-metallic elastic pipe is in contact with the inner surface of the head of the reuse, the other end is in contact with one surface of the washer, and The structure of the waterproof reuse device, wherein the other surface of the washer is in contact with the narrow outer end of the pipe.