# US 2012/0074653 A1 · Gasket for small size electronic appliance

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- Number: US 2012/0074653 A1
- Document ID: US20120074653A1
- Status: Published application
- Kind: A1
- Application number: 13/322,833
- Filed: 2010-05-11
- Published: 2012-03-29
- Earliest claimed: 2009-06-12
- Assignees: Nippon Mektron, Ltd.
- Inventors: Takahiro Hayashi
- Web page: https://patentgrep.com/patent/US20120074653A1

## CPC

- F16J 15/106: {homogeneous}
- F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS

## Abstract

A waterproof gasket for a small size electronic appliance of the invention has straight portions (1A) and corner portions (1B) alternately in a peripheral direction, a main seal portion (11) and a seat seal portion (12) brought into close contact with a bottom surface of a gasket retention groove are formed, a shoulder portion (13) protruding in a width direction between said main seal portion (11) and the seat seal portion (12) so as to be brought into close contact with an inner side surface of a groove shoulder of said gasket retention groove is formed in said straight portion (1A), and a recession portion (14) retracting in a width direction relatively from said shoulder portion (13) between said main seal portion (11) and the seat seal portion (12) is formed in said corner portion (1B). Accordingly, a partial compression reaction force increase is prevented in the corner portion.

## Claims

### Claim 1

A waterproof gasket adapted to be retained to a gasket retention groove provided in one of first and second case members forming an outer shell case of a small size electronic appliance, said waterproof gasket comprising:
straight portions and corner portions provided alternately in a peripheral direction corresponding to outer peripheral shapes of said first and second case members;
a main seal portion formed to be brought into close contact with another of said first and second case members; and
a seat seal portion formed to be brought into close contact with a bottom surface of said gasket retention groove;
wherein said straight portion is configured to have a shoulder portion protruding out in a width direction between said main seal portion and the seat seal portion so as to be brought into close contact with an inner side surface of a groove shoulder of said gasket retention groove, and
wherein said corner portion is configured to have a recession portion retracting in a width direction relatively from said shoulder portion between said main seal portion and the seat seal portion.