Patent US3755951A successfully refreshed from Google Patents.
US3755951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trigger mechanism for firearms
Assignee: FIREARM DEV Inc
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Filing: 1971-04-07
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Granted: 1973-09-04
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Expires: 1991-04-07
Abstract
Abstract A trigger mechanism for firearms that employs a pair of springs acting against a trigger piece tending to urge the trigger in opposite rotational senses, respectively, thereby providing a smoother trigger pull. Shoulders are provided on the trigger piece and trigger housing to act as a shoe to prevent over-pull of the trigger when the mechanism is fired.
Inventors
- 👤 H Koon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:27
CPC Classifications
F; F41; F41A; F41A19/00; F41A19/06; F41A19/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
146 words
A trigger mechanism for a firearm of the type that has a cocking piece to be engaged by a sear for controlling movement of the firing pin assembly, comprsing: a. a sear moveable to a position in engagement with said cocking piece to prevent forward movement of said firing pin assembly, b. a trigger having a part for engaging said sear to hold said sear in said position, and a finger piece for moving said part out of engagement with said sear when pulled rearward, c. first adjustable resilient means continuously acting on said trigger tending to urge said part to engagement with said sear, and d. second adjustable resilient means continuously acting on said trigger tending to urge said part out of engagement with said sear, e. said first and said second resilient means being substantially equivalent in adjustability of force acting on said trigger.
Claim 2
Dependent Claim
146 words
A trigger mechanism for a firearm of the type that has a cocking piece to be engaged by a sear for controlling movement of the firing pin assembly, comprsing: a. a sear moveable to a position in engagement with said cocking piece to prevent forward movement of said firing pin assembly, b. a trigger having a part for engaging said sear to hold said sear in said position, and a finger piece for moving said part out of engagement with said sear when pulled rearward, c. first adjustable resilient means continuously acting on said trigger tending to urge said part to engagement with said sear, and d. second adjustable resilient means continuously acting on said trigger tending to urge said part out of engagement with said sear, e. said first and said second resilient means being substantially equivalent in adjustability of force acting on said trigger.
Claim 3
Dependent Claim
26 words
A trigger mechanism as set forth in claim 1 including third resilient means for biasing said sear to said position in engagement with said cocking piece.
Claim 4
Dependent Claim
49 words
A trigger mechanism as set forth in claim 2 including support means for pivotally supporting both said sear and said trigger for rotation in a vertical plane, and said trigger engages said support means when said finger piece is pulled to limit the rearward movement of said finger piece.
Claim 5
Dependent Claim
38 words
A trigger mechanism as set forth in claim 3 including adjustment means coupled to said support means for selectively limiting the distance said finger piece must be pulled to move said part out of engagement with said sear.
Claim 6
Dependent Claim
34 words
A trigger mechanism as set forth in claim 1 including first and second independent adjustment means for adjusting the relative forces exerted on said trigger by said first and said second resilient means, respectively.
Claim 7
Dependent Claim
50 words
A trigger mechanism as set forth in claim 1 including a housing from which said finger piece of said trigger extends, and said finger piece includes shoulders that come to rest against said housing when said finger piece is pulled rearward to limit the rearward movement of said finger piece.
Claim 8
Dependent Claim
80 words
A trigger mechanism as set forth in claim 1 including support means for supporting both said sear and said trigger for rotation in a vertical plane, third resilient means biasing said sear for rotation upward, said first resilient means biases said part for rotation under said sear to prevent downward rotation of said sear until said finger piece is pulled, and adjustment means coupled to said support means for limiting the distance said part can be rotated under said sear.
Claim 9
Dependent Claim
52 words
A trigger mechanism as set forth in claim 1 including support means for supporting said first and said second resilient means, and adjustment means coupled to said support means to which access may be had for adjusting the relative forces exerted on said trigger by said first and said second resilient means.
Claim 10
Dependent Claim
67 words
A trigger mechanism as set forth in claim 5 wherein said first and said second means comprise first and second springs, respectively, bearing against said trigger, and said first and said second adjustment means comprise first and second members against which said first and said second springs also bear and which can be adjusted to change the amounts of compressions on said first and said second springs.
Claim 11
Dependent Claim
35 words
A trigger mechanism as set forth in claim 9 including an another adjustment means for selectively limiting the distance said finger piece must be pulled to move said part out of engagement with said sear.
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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |