US3793495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure switch with diaphragm formed of flexible compressible material containing discrete electrically conductive particles which make and break the circuit
Assignee: Lucas Electrical Co Ltd
•
Filing: 1973-02-05
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Granted: 1974-02-19
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Expires: 1993-02-05
Abstract
Abstract A fluid pressure operated switch comprises an electrically conductive body having a passage therethrough, a diaphragm engaging a shoulder on the body around the passage and lying across the latter, and a contact plate spring biassed into engagement with the diaphragm. The diaphragm is formed of a flexible, compressible material which becomes electrically conductive when compressed. The pressure applied by the spring acts on a portion of the diaphragm lying against the shoulder and is normally sufficient to render that portion electrically conductive so that the contact plate is normally electrically connected with the body. When a sufficient pressure exists in the passage, the pressure applied by the spring on the said portion of the diaphragm is reduced to an extent such that the diaphragm is no longer electrically conductive and the contact plate is electrically isolated from the body.
Inventors
- 👤 A Heap
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:53
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/021; H01H1/029; H01H35/00; H01H35/24; H01H35/34; H01H35/346
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
160 words
A fluid pressure operated switch comprising a body having a passage therein and at least a contact portion which is of conductive material, a diaphragm extending across said passage and formed of a flexible compressible material containing discrete particles of electrically conductive material which are brought into contact with one another to establish conductive paths through the material when the material is compressed, a contact member spring-biased into engagement with said diaphragm so as to compress a portion of said diaphragm between the contact member and the contact portion of the body, the arrangement being such that the application of sufficient fluid pressure to said passage to overcome spring bias on the contact member deforms the diaphragm so that the portion thereof which is compressed between the contact member and the contact portion of the body is disengaged from the contact member so as to break the electrical connection between the contact member and the contact portion of the body.
Claim 2
Dependent Claim
160 words
A fluid pressure operated switch comprising a body having a passage therein and at least a contact portion which is of conductive material, a diaphragm extending across said passage and formed of a flexible compressible material containing discrete particles of electrically conductive material which are brought into contact with one another to establish conductive paths through the material when the material is compressed, a contact member spring-biased into engagement with said diaphragm so as to compress a portion of said diaphragm between the contact member and the contact portion of the body, the arrangement being such that the application of sufficient fluid pressure to said passage to overcome spring bias on the contact member deforms the diaphragm so that the portion thereof which is compressed between the contact member and the contact portion of the body is disengaged from the contact member so as to break the electrical connection between the contact member and the contact portion of the body.
Claim 3
Dependent Claim
25 words
A switch as claimed in claim 1, wherein the contact portion of the body is provided by a shoulder therein against which the diaphragm abuts.
Claim 4
Dependent Claim
28 words
A switch as claimed in claim 2, wherein the diaphragm is lodged between the shoulder and an electrically insulating hollow member in which is disposed the contact member.
Claim 5
Dependent Claim
30 words
A switch as claimed in claim 3, wherein the hollow member carries a terminal electrically connected with the contact member via the spring which is lodged in the hollow member.
Claim 6
Dependent Claim
28 words
A switch as claimed in claim 3, wherein a portion of the hollow member surrounding the contact member is defined by a flared mouth which engages the diaphragm.
References Cited (Backward Citations)
US2474662A
Cited
US2752558A
Cited
FR1177677A
Cited
US3394345A
Cited
US3455165A
Cited
US3509296A
Cited
US3573725A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |