Patent US3877375A successfully refreshed from Google Patents.
US3877375A
Expired / Lapsed
US
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Primer
Assignee: Textron Systems Corp
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Filing: 1973-08-27
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Granted: 1975-04-15
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Expires: 1993-08-27
Abstract
Abstract An anvil-less percussive ignition primer is provided having a cup-shaped body which is closed at one end and open at its opposite end, the body having a compact primer mixture held therein and having no anvil therein. The closed rear end of the primer is deformable, the primer body retains its structural integrity during and after firing, and the compact primer mixture is ignitable by abrupt external inwardly directed deformation of the closed rear end of the cup-shaped body. The primer is disposed in the rear of a cartridge, with its anvil-less open forward end facing a charge of propellant powder ignited by percussive ignition of the anvil-less primer.
Inventors
- 👤 Irwin R Barr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:58
CPC Classifications
F; F42; F42B; F42B5/00; F42B5/26; F42B5/36; F42C; F42C19/00; F42C19/08; F42C19/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
166 words
An anvil-less percussive primer having a cup-shaped body portion formed of malleable material of a character and a thickness to maintain its body integrity when the primer is fired, yet sufficiently thin-walled at its closed base to enable percussive dimpling thereof by a firing pin, said cup-shaped body portion containing a compact primer mixture and being effectively open at its forward end and devoid of an anvil, said primer having a closed deformable rear end, and said compact primer mixture having a length greater than its crosssectional width and being retained as a unit mass within said cup-shaped body in direct engagement with said closed deformable rear end, said compact percussive primer mixture being ignitible as a function of abrupt external inwardly directed non-rupturing, central, percussive dimpling deformation of said closed deformable rear end, said malleable material of said body portion being effectively non-combustible by and upon percussive firing of said primer mixture through said abrupt external inwardly directed deformation of said closed deformable rear end.
Claim 2
Dependent Claim
166 words
An anvil-less percussive primer having a cup-shaped body portion formed of malleable material of a character and a thickness to maintain its body integrity when the primer is fired, yet sufficiently thin-walled at its closed base to enable percussive dimpling thereof by a firing pin, said cup-shaped body portion containing a compact primer mixture and being effectively open at its forward end and devoid of an anvil, said primer having a closed deformable rear end, and said compact primer mixture having a length greater than its crosssectional width and being retained as a unit mass within said cup-shaped body in direct engagement with said closed deformable rear end, said compact percussive primer mixture being ignitible as a function of abrupt external inwardly directed non-rupturing, central, percussive dimpling deformation of said closed deformable rear end, said malleable material of said body portion being effectively non-combustible by and upon percussive firing of said primer mixture through said abrupt external inwardly directed deformation of said closed deformable rear end.
Claim 3
Dependent Claim
20 words
An anvil-less primer according to claim 1, said cup-shaped body portion consisting of a one-piece cup formed of malleable metal.
Claim 4
Dependent Claim
16 words
An anvil-less primer according to claim 1, said primer mixture having a frangible anvil-less covering thereon.
Claim 5
Dependent Claim
16 words
An anvil-less primer according to claim 1, said primer mixture comprising the mixture of Example I.
Claim 6
Dependent Claim
16 words
An anvil-less primer according to claim 1, said primer mixture comprising the mixture of Example II.
Claim 7
Dependent Claim
23 words
An anvil-less primer according to claim 1, said compact primer mixture comprising an explosive powder constituent, an oxidizer constituent, and an abrasive constituent.
Claim 8
Dependent Claim
27 words
An anvil-less primer according to claim 6, said primer mixture further comprising a catalyst constituent for increasing explosive reaction rate between said explosive powder and said oxidizer.
Claim 9
Dependent Claim
132 words
A cup-shaped body portion formed of a malleable metal of a character and thickness to maintain its body integrity when fired, said cup-shaped body portion having a compact primer mixture having a length greater than its cross-sectional width and retained therein as a unit mass by compact frictional gripping with the side walls of said cup-shaped body portion being effectively open at its forward end and devoid of an anvil, said cup-shaped body portion having a closed deformable rear end, and said compact primer mixture being ignitable by abrupt percussive external inwardly directed deformation of said closed rear end, said malleable metal forming said cup-shaped body portion being effectively non-combustible by and upon percussive firing of said primer mixture through said abrupt external inwardly directed deformation of said closed deformable rear end.
Claim 10
Dependent Claim
132 words
A cup-shaped body portion formed of a malleable metal of a character and thickness to maintain its body integrity when fired, said cup-shaped body portion having a compact primer mixture having a length greater than its cross-sectional width and retained therein as a unit mass by compact frictional gripping with the side walls of said cup-shaped body portion being effectively open at its forward end and devoid of an anvil, said cup-shaped body portion having a closed deformable rear end, and said compact primer mixture being ignitable by abrupt percussive external inwardly directed deformation of said closed rear end, said malleable metal forming said cup-shaped body portion being effectively non-combustible by and upon percussive firing of said primer mixture through said abrupt external inwardly directed deformation of said closed deformable rear end.
Claim 11
Dependent Claim
18 words
An anvil-less primer according to claim 8, said cup-shaped body portion being an integral cup formed of metal.
Claim 12
Dependent Claim
16 words
An anvil-less primer according to claim 7, said cup-shaped body portion being a one-piece integral cup.
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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |