Patent US3786750A successfully refreshed from Google Patents.
US3786750A
Expired / Lapsed
US
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Motion sensitive explosive with a delay mechanism
Assignee: United States Department of the Army
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Filing: 1973-01-03
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Granted: 1974-01-22
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Expires: 1993-01-03
Abstract
Abstract A motion sensitive explosive device is kept in a safe unarmed condition by a pair of silicone gum plugs which have been expanded by absorption of a fluoro-carbon fluid such as FREON. The expanded plugs hold a trip lever arm immovable against a detent when the device is being deployed. The device when implaced is armed, after a time delay, by evaporation of the fluoro-carbon which causes shrinking of the plugs to their normal size and release of the lever arm. Upon subsequent slight movement of the device the trip lever releases a spring loaded firing pin so that it can strike and ignite an impact detonator.
Inventors
- 👤 A Zacharin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:57
CPC Classifications
F; F42; F42C; F42C15/00; F42C15/28; F42C15/285; F42C14/00; F42C14/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
83 words
A motion sensitive explosive device as recited in claim 1 wherein said triggering means comprises: said body having a firing pin bore therein; a firing pin slidably positioned in said firing pin bore, said firing pin being stopped by said lever means when said device is in a ''''safe'''' and ''''armed'''' condition; a retainer threadedly held in said body for closing one end of said firing pin bore; and a coil spring biasedly held in compression imtermediate said firing pin and said retainer.
Claim 2
Dependent Claim
74 words
A motion sensitive explosive device as recited in claim 2 wherein said lever means comprises: a lever arm rotatably positioned within said body slot having a rounded end making line contact with said detent pin when said device is in said ''''safe'''' and ''''armed'''' conditions, and its other end in contact with said firing pin; and a pivot fixedly held in said body for permitting said lever arm to rotate within said body slot.
Claim 3
Dependent Claim
117 words
A motion sensitive explosive device as recited in claim 3 wherein said delay means comprises: a pair of silicone rubber plugs slidably held in said housing and body delay bores, for holding said detent pin and said rounded end of said lever arm intermediate therebetween; a pair of porous end caps operatively positioned in said housing for retaining said rubber plugs in said delay housing bores; and a fluorocarbon fluid operatively disposed in said housing and body for expanding said plugs when said device is in a ''''safe'''' condition and for evaporating from said housing and body so that said silicone rubber plugs can contract releasing said levEr arm when said device is in said ''''armed'''' condition.
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |