US3967558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propellant grain support apparatus
Assignee: United States Department of the Army
•
Filing: 1974-12-09
•
Granted: 1976-07-06
•
Expires: 1994-12-09
Abstract
Abstract Propellant grain material in the form of corrugated rectangularly shaped forated strips is supported in a radial cylindrical configuration by support rings and a plurality of equally spaced longitudinal support blocks. The longitudinal and cylindrical support structures support the propellant material during combustion and orientate the strip for uniform ignition of all surfaces. The propellant strips are designed to aid in their assembly to the support structure, to provide channels through which the propellant surfaces may be ignited, and in addition, to provide paths through which gas produced can be more uniformly exhausted.
Inventors
- 👤 Frank A. Brody
- 👤 Emil K. Merz
- 👤 Peter Van den Houten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:16
CPC Classifications
F; F42; F42B; F42B5/00; F42B5/02; F42B5/16; F02; F02K; F02K9/00; F02K9/08; F02K9/10; F02K9/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
118 words
A propellant grain support apparatus which comprises: a plurality of channeled propellant grain strips having a plurality of holes therethrough; a plurality of longitudinally equally spaced support blocks positioned intermediate said grain strips, said support blocks having a plurality of holes therethrough which are axially aligned with the holes of said grain strips; a plurality of split interlocking support rings which pass through the holes of said grain strips and said support blocks, wherein said rings, blocks and strips form a cylindrically shaped propellant charge assembly which after being placed in the combustion chamber of a recoilless rifle maintains a radial orientation during firing to achieve simultaneous ignition of propellant surfaces, controlled interior ballistics and controlled gas porting.
Claim 2
Dependent Claim
118 words
A propellant grain support apparatus which comprises: a plurality of channeled propellant grain strips having a plurality of holes therethrough; a plurality of longitudinally equally spaced support blocks positioned intermediate said grain strips, said support blocks having a plurality of holes therethrough which are axially aligned with the holes of said grain strips; a plurality of split interlocking support rings which pass through the holes of said grain strips and said support blocks, wherein said rings, blocks and strips form a cylindrically shaped propellant charge assembly which after being placed in the combustion chamber of a recoilless rifle maintains a radial orientation during firing to achieve simultaneous ignition of propellant surfaces, controlled interior ballistics and controlled gas porting.
Claim 3
Dependent Claim
27 words
A propellant grain support apparatus as recited in claim 1 wherein the grain strips further include a plurality of rectangularly shaped strips having parallel channel surfaces thereon.
Claim 4
Dependent Claim
16 words
A propellant grain support apparatus as recited in claim 1 wherein the grain strips are embossed.
Claim 5
Dependent Claim
52 words
A propellant grain support apparatus as recited in claim 1 wherein the propellant grain strips comprise: a plurality of plain sheet propellants; and spacer washers positioned intermediate said plain sheet propellants to provide channels through which the propellant surfaces of said sheets are ignited and through which gas produced can be exhausted.
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) | 1979-07-06 | 1980-01-05 | 1980-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-06 | 1984-01-05 | 1984-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-06 | 1988-01-05 | 1988-07-06 | $7700.00 | Window Closed / Lapsed |