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US 2002/0001462 A1Published application
Leakage detector for a sealed housing
OwnerKenneth Kam-Sing Hoinventor
Life of this patent
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Abstract
To test the integrity of waterproof cases for cameras and like apparatus to be used underwater, a casing with a detector is provided. The air inside the casing is pressurized and the detector indicates leakage based on the difference between the pressurized air and atmospheric pressure. A decrease in pressure of the initial level of pressurized air implies leakage.
Claims22
A case comprising:
- (a) sealed housing (10) with an outer wall;
- and
- (b) a leakage detector (20) firmly located in said wall having:
- (i) a chamber with first and second sub-chambers (30, 32);
- (ii) first port means (31) by which said first sub-chamber (30) communicates with the environment;
- (iii) second port means (23) by which said second sub-chamber communicates with the environment;
- (iv) a partition (25) separating said first sub-chamber from said second sub-chamber which moves in response to the difference in the respective air pressures of said first and second sub-chamber (30, 32);
- and
- (v) indicator means (26), located proximate said partition and responsive to movement of said partition, for indicating leakage.
6 more elements
A leakage detector (20) for a sealed housing (10) with an outer wall, comprising:
- (i) a chamber with first and second sub-chambers (30, 32);
- (ii) first port means (31) by which said first sub-chamber (30) communicates with the environment;
- (iii) second port means (23) by which said second sub-chamber (32) communicates with the environment;
- (iv) a partition (25) separating said first sub-chamber (30) from said second sub-chamber (32) which moves in response to the difference in the respective air pressures of said first and second sub-chamber (30, 32);
- and
- (v) indicator means (26), located proximate said partition (125) and responsive to movement of said partition (25), for indicating leakage.
3 more elements
A method of detecting leakage in a case, comprising the steps of:
- (a) creating a first sub-chamber (32) of pressurized air in communication with the interior of the case;
- (b) creating a second sub-chamber of air at atmospheric pressure (30);
- (c) wherein a transparent tube (126) connects said first sub-chamber (32) and said second sub-chamber (30) and an oil drop (125) is disposed within said tube (126), wherein said oil drop (125) moves in response to the relative differences in air pressures of said first and second sub-chambers (32, 30).
A method of detecting leakage in a case, comprising the steps of:
- (a) creating a first sub-chamber (30) in communication with the environment;
- (b) creating a second sub-chamber (32) of pressurized air in communication with the interior of the case and with the environment;
- (c) abutting a portion of said first sub-chamber (30) with a portion of said second sub-chamber (32) where the abutment takes the form of a partition (25) which moves in response to the difference in respective air pressures of said first and second sub-chambers.
Dependencies are inferred from the claim text.