Patent US4232843A successfully refreshed from Google Patents.
US4232843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molded nozzle for rocket motor
Assignee: Department of National Defence
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Filing: 1978-03-30
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Granted: 1980-11-11
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Expires: 1998-03-30
Abstract
Abstract A lightweight, relatively inexpensive rocket nozzle assembly which is heat resistant, ablative and electrically insulating. The body of the nozzle is molded in fibre reinforced thermosetting resin integrally with a forward metallic retaining ring, a rear metallic fin supporting ring and an electrical contact ring. A graphite throat insert is also provided and helical vanes are integrally molded into the rear portion of the nozzle to effect rotary motion of the exhaust gases. Wrap around fins are secured externally of the nozzle and provided with a retainer ring-shear pin assembly to hold the fins in the closed position for transport, and spring means to deploy the fins after firing and shearing of the shear pins.
Inventors
- 👤 Michael N. Clark
- 👤 Donald L. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:55
CPC Classifications
F; F02; F02K; F02K9/00; F02K9/97; F02K9/974; F42; F42B; F42B10/00; F42B10/02; F42B10/14; F42B10/16; F42B10/26; F42B10/28; F42B10/30; Y; Y10; Y10S; Y10S239/00; Y10S239/19
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
119 words
A rocket nozzle assembly comprising: (a) an ablative fibre-reinforced thermosetting plastic nozzle body having a throat and an exit for positioning in a rocket motor chamber; (b) an elongated metallic retaining ring integrally molded in an circumscribing said body adjacent said throat for positioning said nozzle body in said rocket motor chamber and to spread out aerodynamic and thermal expansion loads over the nozzle body and transmit these loads to the rocket motor chamber; (c) a metallic fin supporting ring integrally molded in and circumscribing said body adjacent said exit; and (d) a metallic electrical contact ring integrally molded in and circumscribing said exit electrically insulated from the rocket and adapted to be electrically connected to a firing circuit.
Claim 2
Dependent Claim
119 words
A rocket nozzle assembly comprising: (a) an ablative fibre-reinforced thermosetting plastic nozzle body having a throat and an exit for positioning in a rocket motor chamber; (b) an elongated metallic retaining ring integrally molded in an circumscribing said body adjacent said throat for positioning said nozzle body in said rocket motor chamber and to spread out aerodynamic and thermal expansion loads over the nozzle body and transmit these loads to the rocket motor chamber; (c) a metallic fin supporting ring integrally molded in and circumscribing said body adjacent said exit; and (d) a metallic electrical contact ring integrally molded in and circumscribing said exit electrically insulated from the rocket and adapted to be electrically connected to a firing circuit.
Claim 3
Dependent Claim
16 words
A rocket nozzle assembly as claimed in claim 1 including a graphite insert in said throat.
Claim 4
Dependent Claim
49 words
A rocket nozzle assembly as claimed in claim 1 including a plurality of fin means spaced around said nozzle body and pivotally supported between said retaining ring and said fin supporting ring, whereby said retaining ring and said fin supporting ring support the aerodynamic loads from said fin means.
Claim 5
Dependent Claim
31 words
A rocket nozzle assembly as claimed in claim 3 including spring means biasing said fin means from a closed position substantially around said nozzle body to a deployed position perpendicular thereto.
Claim 6
Dependent Claim
23 words
A rocket nozzle assembly as claimed in claim 4 including fin retaining ring means for retaining said fin means in said closed position.
Claim 7
Dependent Claim
27 words
A rocket nozzle assembly as claimed in claim 5 including shear pins in said fin-retaining ring means for securing said nozzle assembly to said retaining ring means.
Claim 8
Dependent Claim
25 words
A rocket nozzle assembly as claimed in claim 1, 2 or 3 including helical vane means integrally moulded in said nozzle body adjacent said exit.
Claim 9
Dependent Claim
33 words
A rocket nozzle assembly as claimed in claim 1, 2 or 3 wherein said thermmosetting plastic is reinforced with a fibrous material selected from the group consisting of glass, asbestos, silica and graphite.
Claim 10
Dependent Claim
23 words
A rocket nozzle assembly as claimed in claim 1, 2 or 3 including means to secure said retaining ring to a rocket casing.
Claim 11
Dependent Claim
21 words
A rocket nozzle assembly as claimed in claim 1, 2 or 3, wherein said thermosetting plastic is a phenolic moulding compound.
References Cited (Backward Citations)
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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) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |