Patent US4687340A successfully refreshed from Google Patents.
Patent US3786633A successfully refreshed from Google Patents.
US3786633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propellant immobilizer and resonance suppression system
Assignee: United States Department of the Navy
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Filing: 1973-01-26
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Granted: 1974-01-22
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Expires: 1993-01-26
Abstract
Abstract A system for immobilizing solid propellant grain while providing an improved mechanical suppression of resonant burning comprises a small diameter, tension spring extending within the center bore of the grain. The spring is fastened at the forward end to a spacer abutting the grain while the other end is fastened to a resonator rod positioned within the center bore. An immobilizing force is thus exerted upon the grain which does not appreciably vary with ambient temperature changes. The spring is free to oscillate in the longitudinal and transverse modes thus serving more effectively as a mechanical resonance suppressor.
Inventors
- 👤 F Worcester
- 👤 W Ailor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:18
CPC Classifications
F; F02; F02K; F02K9/00; F02K9/08; F02K9/32; F02K9/36
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
94 words
An improved rocket motor comprising, in combination: a motor casing having one end enclosed; a solid propellant grain with a central bore disposed within said casing; first support means including a rod disposed adjacent the enclosed end of said casing and extending into said central bore; second support means including an annular spacer disposed adjacent one end of said propellant grain; and elastic means including a spring with ends attached to said rod and said second support means whereby said spring is placed in tension to exert an immobilizing force on said propellant grain.
Claim 2
Dependent Claim
94 words
An improved rocket motor comprising, in combination: a motor casing having one end enclosed; a solid propellant grain with a central bore disposed within said casing; first support means including a rod disposed adjacent the enclosed end of said casing and extending into said central bore; second support means including an annular spacer disposed adjacent one end of said propellant grain; and elastic means including a spring with ends attached to said rod and said second support means whereby said spring is placed in tension to exert an immobilizing force on said propellant grain.
Claim 3
Dependent Claim
47 words
The rocket motor of claim 1 wherein said spacer is centrally perforated, said rod extends into the propellant grain bore through the central perforation of said spacer, the end of said spring being attached to the aft portion of said rod and said spacer being reciprocally movable.
Claim 4
Dependent Claim
35 words
The rocket motor of claim 4 further comprising collapsible means disposed between said spacer and the enclosed end of said motor casing adapted to enclose substantially the volume between said spacer and said enclosed end.
Claim 5
Dependent Claim
90 words
In a rocket motor having a propellant casing enclosed at one end and a solid propellant grain with a central bore, a propellant grain immobilizing and resonance suppression system comprising: a first support means including a rod disposed adjacenT the enclosed end of the casing and extending into the propellant grain bore; a second support means disposed adjacent and end of the propellant grain; and elastic means including a spring with ends attached to said rod and said second support means to apply an immobilizing force on the propellant grain.
Claim 6
Dependent Claim
90 words
In a rocket motor having a propellant casing enclosed at one end and a solid propellant grain with a central bore, a propellant grain immobilizing and resonance suppression system comprising: a first support means including a rod disposed adjacenT the enclosed end of the casing and extending into the propellant grain bore; a second support means disposed adjacent and end of the propellant grain; and elastic means including a spring with ends attached to said rod and said second support means to apply an immobilizing force on the propellant grain.
Claim 7
Dependent Claim
28 words
The system of claim 4 wherein said second support means comprises a pair of annular discs disposed adjacent the forward end of the propellant grain and reciprocally movable.
Claim 8
Dependent Claim
59 words
The system of claim 5 wherein said discs are perforated, said rod extends into the propellant grain bore through said perforated discs and said spring is attached at one end to the aft portion of said rod and at the other end to said discs whereby when said discs move reciprocally said spring is adapted to extend and contract.
Claim 9
Dependent Claim
21 words
The system of claim 6 further comprising collapsible means disposed between said perforated discs and said enclosed end of the casing.
Claim 10
Dependent Claim
16 words
The system of claim 7 wherein said collapsible means comprises sleeve means having pleated side walls.
Claim 11
Dependent Claim
35 words
The system of claim 7 wherein said collapsible means comprises a pair of concentric, cup shaped sleeves with the open ends opposing each other and with one of said sleeves reciprocally movable within the other.
Claim 12
Dependent Claim
46 words
The system of claim 9 further comprising: a circular disc positionable adjacent the closed end of said casing; an elongated igniter, one end attached to said disc and the other end attached to said rod; and said spring being disposed encircling said igniter and said rod.
Claim 13
Dependent Claim
31 words
The system of claim 10 wherein a portion of said rod is coated with a combustion stabilizing compound and said spring is attached to said rod aft of said compound coating.
Claim 14
Dependent Claim
23 words
The system of claim 9 wherein said rod comprises an arcuately bent, recessed forward portion positionable adjacent said enclosed end of said casing.
Claim 15
Dependent Claim
20 words
The system of claim 12 further comprising an igniter adapted to be positioned within said recessed portion of said rod.
Claim 16
Dependent Claim
28 words
The system of claim 13 wherein a portion of said rod is coated with a combustion stabilizing compound and said spring is attached aft of said compound coating.
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 |