Waterproof button switch

Details Waterproof button switch Waterproof button switch

2001-07-13

2002-11-19

Friedhofer, Michael (Department: 2832)

Electricity: circuit makers and breakers

Electric switch details

Cases and bases

C200S302100, C200S341000

Reexamination Certificate

active

06483057

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a waterproof button switch, especially to a waterproof button switch with leakage proof ring.
BACKGROUND OF THE INVENTION
FIG. 1
shows a prior art button switch comprising a switch mount
2
a
and a base
1
a
. The switch mount
2
a
has a stage
21
a
and a cap
22
a
arranged thereon. The base
1
a has a hole
11
a
with an inner surface
12
a
. The cap
22
a
has relative movement with the inner surface
12
a
and has relative movement with a vertical groove (not shown) in the stage
21
a
. The cap
22
a
has a recess
23
a
on a circumference thereof and a leakage proof ring
3
a (such as an o-ring) is embedded into the recess
23
a
. The leakage proof ring
3
a
has circular cross-section and slides along the inner surface
12
a
of the base
1
a.
The leakage proof ring
3
a
is made of flexible material such as rubber. When droplet accidentally insets into the hole
11
a
, the droplet is accumulated atop the leakage proof ring
3
a
. The leakage proof ring
3
a
may have problem of twisting during operation of the button switch and is expanded or shrunk with temperature variation. As a result. the droplet accumulated atop the leakage proof ring
3
a
has the risk of leaking into the switch mount
2
a
and damaging a circuit board (not shown) of the switch mount
2
a
. In other word, the leakage proof ring
3
a
cannot provide tight seal for the button switch.
SUMMARY OF THE INVENTION
It is the object of the present invention to provide a waterproof button switch with leakage proof ring.
In one aspect of the present invention, the button switch has a leakage proof ring having a tail portion bent to have surface contact with an inner wall a hole receiving a cap of the button switch. The tail is bent to form an accommodation space for storing droplet accidentally flowing into the hole.
To achieve above object, the present invention provides a waterproof button switch having a switch mount and a base. The switch mount has a stage and a cap arranged thereon. The base has a hole with an inner surface. The cap as relative movement with the inner surface and also has relative movement with the stage. The cap has a recess with rectangular cross-section on a circumference thereof and a leakage proof ring is embedded into the recess. The leakage proof ring has an inner semi-segment and an outer semi-segment. The inner semi-segment has rectangular cross-section for fitting into the recess. The outer semi-segment is slantingly extended from an outer surface of the inner semi-segment and has a triangular cross-section, the outer semi-segment comprises a tail having surface contact with the inner surface of the hole.


REFERENCES:
patent: 4031348 (1977-06-01), Eberhardt
patent: 4152564 (1979-05-01), Wirz
patent: 4417113 (1983-11-01), Saito et al.
patent: 4698466 (1987-10-01), Beck et al.

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