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Patent US3898934A successfully refreshed from Google Patents.
US3898934A
Expired / Lapsed
US
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Multistrand powder charge
Assignee: REPUBLIC OF FRANCE
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Filing: 1973-05-10
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Granted: 1975-08-12
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Expires: 1993-05-10
Abstract
Abstract A multistrand powder charge consists of a bundle of powder strands fixed by one of their ends on a support. The charge is characterized in that there is provision, in the very heart of the bundle and in at least one region between the support and the free end of the powder strands, of internal bracing means that extend crosswise with reference to the powder strands, designed to hold the said powder strands between them in such a way that each strand is separated from at least one adjacent strand, to allow a gaseous flow between the said powder strands during combustion of the charge.
Inventors
- 👤 Jacques Mercier
- 👤 Bernard Lancon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:09
CPC Classifications
F; F02; F02K; F02K9/00; F02K9/08; F02K9/32; F02K9/36; F02K9/10; F02K9/14
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
144 words
Multistrand powder charge comprising a bundle of elongate rod-like individual powder strands fixed by one of their ends on a support so as to extend therefrom to their oppositely located free ends; internal bracing means in the heart of the bundle and in at least one region between the support and the free end of the powder strands, extending crosswise relative to and between the powder strands, for separating and holding the said powder strands fixedly relative to each other and such that each strand is separated from at least one adjacent strand by said internal bracing means, to allow a gaseous flow between the said powder strands during the combustion of the charge and maintain the bundle as an integral unit, the separations between adjacent strands constituting open gas flow paths over at least the major part of the lengths of said strands.
Claim 2
Dependent Claim
144 words
Multistrand powder charge comprising a bundle of elongate rod-like individual powder strands fixed by one of their ends on a support so as to extend therefrom to their oppositely located free ends; internal bracing means in the heart of the bundle and in at least one region between the support and the free end of the powder strands, extending crosswise relative to and between the powder strands, for separating and holding the said powder strands fixedly relative to each other and such that each strand is separated from at least one adjacent strand by said internal bracing means, to allow a gaseous flow between the said powder strands during the combustion of the charge and maintain the bundle as an integral unit, the separations between adjacent strands constituting open gas flow paths over at least the major part of the lengths of said strands.
Claim 3
Dependent Claim
44 words
Multistrand powder charge as in claim 1, in which the powder strands are generally parallel and arranged in concentric circular layers, and wherein the internal bracing means are constituted by a plurality of concentric closed ties each surrounding a circular layer of powder strands.
Claim 4
Dependent Claim
71 words
Multistrand powder charge as in claim 1, in which the powder strands are generally parallel and arranged in concentric circular layers, and wherein the internal bracing means are constituted by a single tie that successively surrounds the circular layers of powder strands, passing from one layer to another between two adjacent powder strands of the same layer, the external circular layer of powder strands being held by the said single tie.
Claim 5
Dependent Claim
71 words
Multistrand powder charge as in claim 1, in which the powder strands are generally parallel and arranged in concentric circular layers, and wherein the internal bracing means are constituted by a single tie that successively surrounds the circular layers of powder strands, passing from one layer to another between two adjacent powder strands of the same layer, the external layer of powder strands being held by an independent closed external tie.
Claim 6
Dependent Claim
63 words
Multistrand powder charge as in claim 1, in which the powder strands are generally parallel and arranged in lines and columns, and wherein the internal bracing means are constituted by two ties situated in different planes, one of the said ties substantially surrounding and separating the lines of powder strands, whereas the other tie substantially surrounds and separates the columns of powder strands.
Claim 7
Dependent Claim
41 words
Multistrand powder charge as in claim 1, wherein the internal bracing means are constituted by a grid that comprises on the one hand bearings for the powder strands and on the other hand spaces between the grid and the powder strands.
Claim 8
Dependent Claim
38 words
Multistrand powder charge as in claim 6, wherein the grid comprises at least two offset networks of spaced elements, the two said networks being oriented crosswise with reference to each other and joined by crosspieces at their intersections.
Claim 9
Dependent Claim
47 words
Multistrand powder charge as in claim 1, wherein the powder strands are fixed by one of their ends on the inner face of a cylindrical support, and wherein the bracing means are constituted by a grid that comprises longitudinal elements and circular elements joined at their intersections.
Claim 10
Dependent Claim
15 words
Multistrand powder charge as in claim 1 wherein the internal bracing means have elastic properties.
Claim 11
Dependent Claim
32 words
Multistrand powder charge as in claim 1 wherein the internal bracing means are constituted by a consumable material that is destroyed in the moments following initiation of combustion of the powder charge.
Claim 12
Dependent Claim
19 words
Missile or rocket equipped with a powder propulsion device comprising a multistrand powder charge as claimed in claim 1.
Claim 13
Dependent Claim
15 words
Multistrand powder charge as claimed in claim 1 wherein the powder strands are generally parallel.
Claim 14
Dependent Claim
49 words
Multistrand powder charge as claimed in claim 12 wherein said powder strands are arranged in generally concentric circular layers as viewed longitudinally, and wherein the internal bracing means comprise tie means surrounding adjacent circular layers so as to separate adjacent layers and maintain the bundle as an integral unit.
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) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |