US4158117A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure sensitive switch
Assignee: BAE Systems Electronics Ltd
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Filing: 1977-11-08
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Granted: 1979-06-12
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Expires: 1997-11-08
Abstract
Abstract A pressure sensitive switch including a poly (vinylidene fluoride) (PVF 2 ) sheet arranged to be compressed and laterally outwardly distended under a load carrying on each major surface thereof contact means for receiving a signal generated by the sheet when compressed and distended two thick blocks of solid elastomeric material between which is sandwiched the sheet, and means for compressing and laterally outwardly distending both blocks by relative motion toward each other thereby in the absence of tension forces compressing and laterally outwardly distending the sheet sandwiched therebetween to generate the signal.
Inventors
- 👤 Robert M. Quilliam
- 👤 Howitt R. Gallantree
- 👤 Andrew J. Watt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:31
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/94; G; G01; G01L; G01L1/00; G01L1/16; Y; Y10; Y10S; Y10S310/00; Y10S310/80
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
100 words
A pressure sensitive switch comprising a poly (vinylidene fluoride) (PVF 2 ) sheet arranged to be compressed and laterally outwardly distended under a load, contact means conductively connected to each major surface of said sheet for receiving a signal generated by said sheet when compressed and distended by the load, two thick blocks of solid elastomeric material between which is sandwiched said sheet, and means for compressing and laterally outwardly distending both blocks by relative motion toward each other and also in the absence of tension forces compressing and laterally outwardly distending said sheet sandwiched therebetween to generate said signal.
Claim 2
Dependent Claim
100 words
A pressure sensitive switch comprising a poly (vinylidene fluoride) (PVF 2 ) sheet arranged to be compressed and laterally outwardly distended under a load, contact means conductively connected to each major surface of said sheet for receiving a signal generated by said sheet when compressed and distended by the load, two thick blocks of solid elastomeric material between which is sandwiched said sheet, and means for compressing and laterally outwardly distending both blocks by relative motion toward each other and also in the absence of tension forces compressing and laterally outwardly distending said sheet sandwiched therebetween to generate said signal.
Claim 3
Dependent Claim
21 words
The pressure sensative switch as defined in claim 1 wherein at least one of said two thick blocks is electrically conductive.
Claim 4
Dependent Claim
99 words
The pressure sensitive switch as defined in claim 1 wherein said two thick blocks are each electrically conductive, and there is provided the sequential connection of one of said contact means, one of said electrically conductive thick blocks, the PVF 2 sheet, the other of said two electrically conductive thick blocks, the other of said contact means, and said compressing means, said compressing means being a manual push button for applying said load to compress and distend said blocks and sheet, and means interposed between said push button and the other of said contact means for preloading said sheet.
Claim 5
Dependent Claim
17 words
The pressure sensative switch as defined in claim 3 wherein said preloading means is a foamed elastomer.
Claim 6
Dependent Claim
130 words
A pressure sensitive switch comprising a poly (vinylidene fluoride) (PVF 2 ) sheet arranged to be compressed and laterally outwardly distended under a load, contact means connected to each major surface of said sheet for receiving a signal generated by said sheet when compressed and distended by the load, two thick blocks of solid elastomeric material between which is sandwiched said sheet, an electrical contact adjacent one of said thick blocks, means for preloading said sheet through said contact, means for compressing and laterally outwardly distending both blocks by relative motion toward each other and also in the absence of tension forces comprising and laterally outwardly distending said sheet sandwiched therebetween to generate said signal, and said preloading means being sandwiched between said one thick block and said compressing means.
Claim 7
Dependent Claim
130 words
A pressure sensitive switch comprising a poly (vinylidene fluoride) (PVF 2 ) sheet arranged to be compressed and laterally outwardly distended under a load, contact means connected to each major surface of said sheet for receiving a signal generated by said sheet when compressed and distended by the load, two thick blocks of solid elastomeric material between which is sandwiched said sheet, an electrical contact adjacent one of said thick blocks, means for preloading said sheet through said contact, means for compressing and laterally outwardly distending both blocks by relative motion toward each other and also in the absence of tension forces comprising and laterally outwardly distending said sheet sandwiched therebetween to generate said signal, and said preloading means being sandwiched between said one thick block and said compressing means.
Claim 8
Dependent Claim
17 words
The pressure sensitive switch as defined in claim 5 wherein said preloading means is a foamed elastomer.
References Cited (Backward Citations)
US3120583A
Cited
US3464531A
Cited
US3586889A
Cited
US3503031A
Cited
US3935485A
Cited
US3940637A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-06-11 | 1982-12-11 | 1983-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-11 | 1986-12-11 | 1987-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-11 | 1990-12-11 | 1991-06-12 | $7700.00 | Window Closed / Lapsed |