US3578767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety and arming device
Assignee: Zeneca Inc
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Filing: 1968-12-11
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Granted: 1971-05-18
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Expires: 1988-12-11
Abstract
Abstract A safety and arming device activated by contact with a liquid activator and armed by the evaporation of the liquid. An element of the device expands when contacted by the liquid activator and contracts when the liquid evaporates; the expansion of this element collapses a member and the element''s subsequent contraction activates a switch which arms the device.
Inventors
- 👤 John T M Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:03
CPC Classifications
F; F42; F42C; F42C15/00; F42C15/32; F42C15/28; F42C19/00; F42C19/06; F42C3/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
119 words
A safety and arming device comprising: a. an element which expands when contacted by a liquid activator and which contracts when said liquid activator evaporates therefrom; b. a switch fixed relative to said element and activated by a release of pressure on said switch; and c. a permanently deformable member positioned between and in pressure contact with both said element in unexpanded condition and said switch, said pressure being sufficient to maintain said switch in an unactivated position, said member being capable of withstanding said pressure but having the property of permanently collapsing under the additional pressure of said element when expanded by said liquid activator, said collapsing being insufficient to activate said switch until said element has contracted.
Claim 2
Dependent Claim
119 words
A safety and arming device comprising: a. an element which expands when contacted by a liquid activator and which contracts when said liquid activator evaporates therefrom; b. a switch fixed relative to said element and activated by a release of pressure on said switch; and c. a permanently deformable member positioned between and in pressure contact with both said element in unexpanded condition and said switch, said pressure being sufficient to maintain said switch in an unactivated position, said member being capable of withstanding said pressure but having the property of permanently collapsing under the additional pressure of said element when expanded by said liquid activator, said collapsing being insufficient to activate said switch until said element has contracted.
Claim 3
Dependent Claim
18 words
The safety and arming device of claim 1 wherein said element is comprised of a cross-linked elastomeric material.
Claim 4
Dependent Claim
31 words
The safety and arming device of claim 2 wherein said cross-linked elastomeric material is silicone rubber and said liquid activator is a fluorine-containing halogen derivative of a lower hydrocarbon to C4.
Claim 5
Dependent Claim
21 words
The safety and arming device of claim 3 wherein said fluorine-containing halogen derivative of a lower hydrocarbon to C4 is trichlorotrifluoroethane.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |