Patent US3887991A successfully refreshed from Google Patents.
US3887991A
Expired / Lapsed
US
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Method of assembling a safety device for rockets
Assignee: United States Department of the Navy
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Filing: 1974-05-17
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Granted: 1975-06-10
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Expires: 1994-05-17
Abstract
Abstract A wire is placed in an open space provided by a pair of grooves, one around the outer periphery of the closures of a rocket motor and the other one around the inner periphery of a rocket motor case and fastened together with an aluminum locking clip. If the rocket motor is subjected to an accidental external heat source of sufficient intensity, the aluminum locking clip fails and the wire springs outwardly freeing the closures from the motor case thus making the motor non-propulsive.
Inventors
- 👤 Edward A Panella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:30
CPC Classifications
F; F02; F02K; F02K9/00; F02K9/08; F02K9/32; F02K9/38; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/4987; Y10T29/49947; Y10T29/49948; Y10T29/4995; Y10T403/00; Y10T403/60
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
141 words
A method for fastening closures and a rocket motor case together comprising the steps of: a. providing an externally grooved closure; b. providing an internally grooved cylindrical motor case; c. aligning the grooves; d. inserting a resilient wire having a cross section larger than the groove in the closure and smaller than the groove in the motor case in the aligned grooves; e. resiliently drawing the ends of the wire together; to move the wire into the groove in said closure, and f. fastening the ends of the wire together with a locking clip fabricated from a material which will retain its streenth at temperatures up to a predetermined temperature and then fail whereby the wire will spring out of the groove in the closure and into the groove in the motor case to release the closure from the motor case.
Claim 2
Independent Claim
141 words
A method for fastening closures and a rocket motor case together comprising the steps of: a. providing an externally grooved closure; b. providing an internally grooved cylindrical motor case; c. aligning the grooves; d. inserting a resilient wire having a cross section larger than the groove in the closure and smaller than the groove in the motor case in the aligned grooves; e. resiliently drawing the ends of the wire together; to move the wire into the groove in said closure, and f. fastening the ends of the wire together with a locking clip fabricated from a material which will retain its streenth at temperatures up to a predetermined temperature and then fail whereby the wire will spring out of the groove in the closure and into the groove in the motor case to release the closure from the motor case.
Claim 3
Dependent Claim
23 words
A method accoridng to claim 1 wherein the material of the locking clip retains its strength up to about 400*F and then fails.
Claim 4
Dependent Claim
35 words
A method according to claim 2 wherein the material of the locking clip is selected from the group consisting of aluminum and aluminum alloys which retain their strength up to about 400*F and then fail.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |