US4004489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual selective feed mechanism for automatic weapons
Assignee: United States Department of the Army
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Filing: 1975-11-03
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Granted: 1977-01-25
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Expires: 1995-11-03
Abstract
Abstract An easily employed, reliable, rapid response and simple multiple feed sys for selectively feeding various belts of varied types of ammunition through the same gun. A round selector cam pivots the rammer on the bolt carrier to a position for chambering cartridges from the selected belt. A dual feed mechanism advances the cartridges from the selected belt while those from the non-selected belt are held ready but not advanced.
Inventors
- 👤 Curtis D. Johnson
- 👤 Fred J. Skahill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:58
CPC Classifications
F; F41; F41A; F41A9/00; F41A9/37
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
109 words
A dual selective feed mechanism for placing cartridges from a pair of ammunition belts into ready to feed positions and chambering cartridges from a selected belt in one of said positions to a chamber position for firing, said mechanism comprising: a pair of feed sprocket assemblies for moving cartridges in a pair of belts into ready to feed positions, a bolt carrier adapted to move forwardly to battery position, a rammer pivotally mounted on said carrier and adapted to strip and chamber cartridges from either belt as said carrier moves to battery position, and selection means pivotally moving said rammer to strip and chamber cartridges from a selected belt.
Claim 2
Dependent Claim
109 words
A dual selective feed mechanism for placing cartridges from a pair of ammunition belts into ready to feed positions and chambering cartridges from a selected belt in one of said positions to a chamber position for firing, said mechanism comprising: a pair of feed sprocket assemblies for moving cartridges in a pair of belts into ready to feed positions, a bolt carrier adapted to move forwardly to battery position, a rammer pivotally mounted on said carrier and adapted to strip and chamber cartridges from either belt as said carrier moves to battery position, and selection means pivotally moving said rammer to strip and chamber cartridges from a selected belt.
Claim 3
Dependent Claim
39 words
A dual selective feed mechanism as set forth in claim 1 wherein said feed sprocket assemblies have feeding guideways thereon for guiding cartridges stripped by said rammer to said chamber position as said bolt carrier advances to battery position.
Claim 4
Dependent Claim
48 words
A dual selective feed mechanism as set forth in claim 1 wherein said selection means includes a round selector cam having inclined surfaces selectively positionable rearwardly of said rammer to deflect said rammer in a desired direction when struck thereby upon rearward recoil movement of said bolt carrier.
Claim 5
Dependent Claim
44 words
A dual selective feed mechanism as set forth in claim 1, and a sensor device responsive to a cartridge remaining in ready to feed position as said bolt carrier moves forwardly to battery position for stopping movement of the belt having said cartridge therein.
Claim 6
Dependent Claim
43 words
A dual selective feed mechanism as in claim 1, and ratchet means operable upon recoil of said belt carrier for rotary advancing the cartridge belt and replacing stripped cartridges in one of said ready to feed positions with cartridges from said selected belt.
Claim 7
Dependent Claim
30 words
A dual selective feed mechanism as in claim 5 including a non-reversing holding ratchet on each sprocket assembly and pawl means engageable with said holding ratchet to prevent counterrotation thereof.
Claim 8
Dependent Claim
64 words
A dual selective feed mechanism as in claim 1 wherein each feed sprocket assembly includes a sprocket connected indexing ratchet wheel, a feed cam plate actuated by rearward movement of said bolt carrier as it recoils from firing, said feed cam plate being operable to rotate said indexing ratchet wheel whereby said ratchet wheel rotates in response to rearward movement of said bolt carrier.
Claim 9
Dependent Claim
27 words
A dual selective feed mechanism as in claim 7 wherein said feed cam plate has a pawl thereon engageable with said ratchet wheel to provide rotation thereof.
Claim 10
Dependent Claim
29 words
A dual selective feed mechanism as in claim 8 wherein said bolt carrier has a camming surface thereon for reciprocating said feed cam plate as said bolt carrier reciprocates.
Claim 11
Dependent Claim
43 words
A dual selective feed mechanism as set forth in claim 9 wherein a sensing device is connected to and immobilizes said feed cam plate when a cartridge remains in said ready to feed position as said bolt carrier moves forward to battery position.
References Cited (Backward Citations)
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Cited
US3277787A
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GB1142380A
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US3611869A
Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-25 | 1980-07-26 | 1981-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-25 | 1984-07-26 | 1985-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-25 | 1988-07-26 | 1989-01-25 | $7700.00 | Window Closed / Lapsed |