US3555220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure switch
Assignee: Lear Corp EEDS and Interiors
•
Filing: 1968-04-08
•
Granted: 1971-01-12
•
Expires: 1988-04-08
Abstract
Abstract A switch responsive to fluid pressure includes a housing constructed of an electrically conductive material and a pair of chambers are formed within the housing separated by a flexible diaphragm. One of the chambers is adapted to be connected to a fluid pressure source and an electrically nonconductive cap seals the end of the other chamber and carries a stationary contact which extends into the other chamber. A resilient disc is disposed in the other chamber adjacent the diaphragm and includes a rim clamped between the housing and the cap, a resilient tab and a movable contact. The resilient tab is responsive to movement of the diaphragm which, in turn, is movable in response to pressure changes in the first chamber, to move the contact surface into and out of electrical contact with the stationary contact. The disc contacts the electrically conductive housing to complete the circuit.
Inventors
- 👤 Charles G Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:04
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/24; H01H35/34
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
186 words
A fluid pressure responsive switch including: a housing defining first and second chambers each having an open end; a flexible diaphragm in said housing sealingly separating said first chamber from said second chamber; said open end of said first chamber being adapted to communicate with a source of fluid pressure to movably flex said diaphragm; a cap closing the open end of said second chamber; stationary contact means carried by said cap and positioned in said second chamber; the improvement comprising resilient movable contact means positioned in said second chamber adjacent said diaphragm, said resilient movable contact means being resiliently deformable in response to movement of said flexible diaphragm to a first position when a first pressure obtains in said first chAmber and being movable to a second position by its own resiliency when a second pressure obtains in said first chamber, the degree of deformation of said resilient movable contact means between said positions being substantially equal to the degree of movement of said flexible diaphragm, said stationary and said movable contact means being in electrical contact with each other in one of said positions.
Claim 2
Dependent Claim
186 words
A fluid pressure responsive switch including: a housing defining first and second chambers each having an open end; a flexible diaphragm in said housing sealingly separating said first chamber from said second chamber; said open end of said first chamber being adapted to communicate with a source of fluid pressure to movably flex said diaphragm; a cap closing the open end of said second chamber; stationary contact means carried by said cap and positioned in said second chamber; the improvement comprising resilient movable contact means positioned in said second chamber adjacent said diaphragm, said resilient movable contact means being resiliently deformable in response to movement of said flexible diaphragm to a first position when a first pressure obtains in said first chAmber and being movable to a second position by its own resiliency when a second pressure obtains in said first chamber, the degree of deformation of said resilient movable contact means between said positions being substantially equal to the degree of movement of said flexible diaphragm, said stationary and said movable contact means being in electrical contact with each other in one of said positions.
Claim 3
Dependent Claim
30 words
The switch of claim 1 wherein said housing is electrically conductive and said resilient movable contact means is in electrical contact with said housing in said first and second positions.
Claim 4
Dependent Claim
19 words
The switch of claim 2 wherein said resilient movable contact means is clamped between said housing and said cap.
Claim 5
Dependent Claim
11 words
The switch of claim 1 wherein said cap is electrically nonconductive.
Claim 6
Dependent Claim
47 words
The switch of claim 1, said resilient movable contact means comprising a disc having a rim portion and a center tab of substantial surface area raised above the major part of the surface of said rim, and a contact surface raised above the surface of said tab.
Claim 7
Dependent Claim
25 words
The switch of claim 5 wherein said disc and the cross section of said second chamber are of substantially the same geometric shape and area.
Claim 8
Dependent Claim
37 words
The switch of claim 6 wherein said tab comprises a major portion of the surface area of said disc and said tab is resiliently deformed relative to said rim in response to the movement of said diaphragm.
Claim 9
Dependent Claim
57 words
The switch of claim 1 wherein said resilient movable contact means is in electrical contact with said stationary contact means when said resilient movable contact means is in said first portion and said electrical contact is broken when said resilient movable contact means is in said second position, said second pressure being greater than said first pressure.
Claim 10
Dependent Claim
57 words
The switch of claim 1 wherein said resilient movable contact means is in electrical contact with said stationary contact means when said resilient movable contact means is in said second position and said electrical contact is broken when said resilient movable contact means is in said first position, said second pressure being greater than said first pressure.
References Cited (Backward Citations)
US2367441A
Cited
US2562286A
Cited
US2721913A
Cited
US2762895A
Cited
US2817727A
Cited
US2827526A
Cited
US2822530A
Cited
US3054871A
Cited
US3121145A
Cited
US3233059A
Cited
US3267233A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |