US5285592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor case with composite overwrap and method
Assignee: Aerojet Rocketdyne Inc
•
Filing: 1991-10-31
•
Granted: 1994-02-15
•
Expires: 2011-10-31
Abstract
Abstract A motor case, including an aluminum barrel and a composite overwrap wound around the barrel to form a composite layer, which protects the operator against case failure during motor firing due to thermal effects caused by insulator defects or the like. The overwrap is formed of a fibrous material and a low temperature curable resin, the overwrap being mechanically bonded to the barrel. The method includes the steps of imparting texture to the outer surface of the barrel, wherein the textured surface includes jagged protrusions extending outwardly therefrom, wrapping an strip of fibrous material impregnated with a low temperature curable resin around the barrel, and curing the case.
Inventors
- 👤 James R. Sides
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:47
CPC Classifications
F; F41; F41A; F41A21/00; F41A21/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
81 words
A motor case comprising a tubular barrel having an outer surface and a composite overwrap wound around said outer surface forming a layer which protects against case failure caused by thermal effects, said overwrap including an elongated strip of fibrous material impregnated with a curable resin, and further wherein said outer surface of said barrel is textured such that there are jagged protrusions extending outwardly therefrom, said protrusions cooperating with said fibrous material to mechanically bond said overwrap to said barrel.
Claim 2
Dependent Claim
81 words
A motor case comprising a tubular barrel having an outer surface and a composite overwrap wound around said outer surface forming a layer which protects against case failure caused by thermal effects, said overwrap including an elongated strip of fibrous material impregnated with a curable resin, and further wherein said outer surface of said barrel is textured such that there are jagged protrusions extending outwardly therefrom, said protrusions cooperating with said fibrous material to mechanically bond said overwrap to said barrel.
Claim 3
Dependent Claim
15 words
A motor case as defined in claim 1, wherein said fibrous material is KEVLAR® material.
Claim 4
Dependent Claim
20 words
A motor case as defined in claim 1, wherein said resin is curable at a temperature of approximately 170° F.
Claim 5
Dependent Claim
16 words
A motor case as defined in claim 1, wherein said overwrap layer is 12-15 millimeters thick.
Claim 6
Dependent Claim
15 words
A motor case as defined in claim 1, wherein said barrel is formed of aluminum.
Claim 7
Dependent Claim
40 words
A motor case as defined in claim 5, wherein said curable resin is curable at a temperature of approximately 170° F. or below, thereby enabling said resin to be cured without causing substantial expansion and contraction of said aluminum barrel.
Claim 8
Independent Claim
59 words
A method of manufacturing a motor case having an aluminum barrel, comprising the steps of imparting texture to the outer surface of the barrel in the form of jagged protrusions extending outwardly therefrom, wrapping an elongated strip of fibrous material impregnated with a curable resin around said barrel to form a composite protective layer thereon, and curing said case.
Claim 9
Independent Claim
59 words
A method of manufacturing a motor case having an aluminum barrel, comprising the steps of imparting texture to the outer surface of the barrel in the form of jagged protrusions extending outwardly therefrom, wrapping an elongated strip of fibrous material impregnated with a curable resin around said barrel to form a composite protective layer thereon, and curing said case.
Claim 10
Dependent Claim
24 words
A method as defined in claim 7, wherein the step of imparting texture includes bombarding said outer surface with hard particles at high velocity.
Claim 11
Dependent Claim
22 words
A method as defined in claim 8, wherein the bombarding step includes bombarding the outer surface of the barrel with steel shot.
Claim 12
Dependent Claim
19 words
A method as defined in claim 7, wherein the case is cured at a temperature of approximately 170° F.
Claim 13
Dependent Claim
30 words
A method as defined in claim 7, wherein the wrapping step includes wrapping the material on said barrel to form a composite layer having a thickness of approximately 12-15 millimeters.
References Cited (Backward Citations)
US2228332A
Cited
US2847786A
Cited
US3517585A
Cited
US4646615A
Cited
US4685236A
Cited
US4655866A
Cited
US4669212A
Cited
US5024711A
Cited
US5038561A
Cited
US5054224A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-02-14 | 1997-08-16 | 1998-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-14 | 2001-08-16 | 2002-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-14 | 2005-08-16 | 2006-02-15 | $7700.00 | Window Closed / Lapsed |