Patent US3687000A successfully refreshed from Google Patents.
US3687000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas operated firearm muzzle attachment
Assignee: United States Department of the Army
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Filing: 1970-04-30
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Granted: 1972-08-29
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Expires: 1990-04-30
Abstract
Abstract A gas operated firearm muzzle attachment for generating sufficient gas pressure in the barrel to operate the firearm gas system when blank cartridges are used and comprising a solid restrictor insertable into the barrel bore to partially block the escape of discharge gases therefrom and a clamp for quickly and easily mounting the restrictor to the barrel.
Inventors
- 👤 John R Csizmar
- 👤 Herbert A Hebeler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:47
CPC Classifications
F; F41; F41A; F41A21/00; F41A21/26
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
139 words
An attachment to the muzzle of a firearm barrel having a flash suppressor attached thereto, said attachment comprising a restrictor insertable into said barrel muzzle for partial restriction thereof and a clamp of unitary construction for releasably securing said restrictor to said barrel muzzle, said clamp being fabricated from a resilient material and comprising an embossed portion forming a pocket for receiving the front end of said flash suppressor in response to attachment to said barrel muzzle, an aperture centrally located in said embossed portion, a flared portion associated with said aperture disposed for receiving one end of said restrictor, means on said restrictor cooperating with said flared portion for fixedly securing said restrictor to said clamp, and said means being disposed for cooperation with said flash suppressor and said pocket for aligning said restrictor with said barrel muzzle.
Claim 2
Dependent Claim
139 words
An attachment to the muzzle of a firearm barrel having a flash suppressor attached thereto, said attachment comprising a restrictor insertable into said barrel muzzle for partial restriction thereof and a clamp of unitary construction for releasably securing said restrictor to said barrel muzzle, said clamp being fabricated from a resilient material and comprising an embossed portion forming a pocket for receiving the front end of said flash suppressor in response to attachment to said barrel muzzle, an aperture centrally located in said embossed portion, a flared portion associated with said aperture disposed for receiving one end of said restrictor, means on said restrictor cooperating with said flared portion for fixedly securing said restrictor to said clamp, and said means being disposed for cooperation with said flash suppressor and said pocket for aligning said restrictor with said barrel muzzle.
Claim 3
Dependent Claim
32 words
The invention as defined in claim 1 and including integral jaw means on said clamp engageable with an annular groove in said flash suppressor for releasably securing said attachment to said suppressor.
Claim 4
Dependent Claim
90 words
The invention as defined in claim 1 wherein said clamp comprises a pair of leaf sprinGs extending oppositely from said embossed portion, each of said leaf springs being of U-configuration in longitudinal cross section and comprising a hand gripping portion extending along the length of said flash suppressor and an arm extending inwardly at right angles from said hand gripping portion toward said flash suppressor, and a pair of jaws extending from said arms for engagement with said groove in response to said hand gripping portions being manually squeezed together.
Claim 5
Dependent Claim
26 words
The invention as defined in claim 3 wherein said jaws are normally disposed in spaced apart relation a distance greater than the diameter of said groove.
Claim 6
Dependent Claim
29 words
The invention as defined in claim 3 wherein said leaf springs include means for releasably securing said jaws in a closed position in response to engagement with said groove.
Claim 7
Dependent Claim
89 words
The invention as defined in claim 5 wherein said means for securing said jaws closed comprises a pair of locking bars extending oppositely from one of said pair of jaws, a pair of latching portions of leaf configuration extending oppositely from the other one of said pair of jaws and arranged to be resiliently displaceable about a lateral axis respective to said attachment, and a tab formed on each of said latching portions for cooperation with a respective one of said locking bars to releasably hold said jaws closed.
Claim 8
Dependent Claim
74 words
The invention as defined in claim 6 wherein each of said tabs comprises a portion of said latching portions disposed on opposite sides of the respective jaw portion and providing a recess open at both sides and the bottom formed between said tab and said latching portion to receive the respective one of said locking bars in response to said hand gripping portions being squeezed together sufficiently to engage said jaws with said groove.
Claim 9
Dependent Claim
49 words
The invention as defined in claim 6 wherein said means on said restrictor cooperating with said flared portion includes a flange dimensioned to function as a shear area thereby to permit separation of said clamp from said restrictor in response to a projectile in said barrel engaging said restrictor.
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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |