US3777384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanism for single action firearm
Assignee: Sturm Ruger and Co Inc
•
Filing: 1972-05-05
•
Granted: 1973-12-11
•
Expires: 1992-05-05
Abstract
Abstract An improved firing mechanism for a firearm having an external hammer that is not rotated to its cocked position by the trigger when the trigger is pulled but which rotates the trigger to its ready-to-fire position when the hammer is manually cocked. The improved mechanism comprises a vertically disposed and movable trigger bar pivotally connected to the trigger, the upper end portion of the trigger bar being disposed in front of the hammer and being movable from its lower position to its upper position when the trigger is rotated from its rest position to its readyto-fire position. Trigger bar blocking means engage the upper end of the trigger bar and prevent upward movement of the trigger bar when the hammer is at rest, and hammer blocking means engage a forward facing surface of the hammer and prevent forward movement of the hammer and firing pin against a cartridge in the chamber when the trigger is in its lower position. The upper end portion of the trigger bar is positioned relative to the hammer so that the hammer and firing pin can strike and fire a cartridge in the chamber when the trigger bar is in its upper position.
Inventors
- 👤 W Ruger
- 👤 L Larson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:17
CPC Classifications
F; F41; F41A; F41A17/00; F41A17/74
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
264 words
In a firearm having an external pivotally mounted hammer that is adapted to be manually cocked, a trigger pivotally mounted below the hammer, a cartridge-receiving chamber in front of the hammer, a firing pin associated with the hammer and mounted in position to strike and fire a cartridge in the chamber, a cam surface on the hammer which contacts and rotates the trigger from its rest position to its ready-to-fire positiOn as the hammer is being cocked, a sear notch in the hammer, a sear for the trigger, and spring means which turns the trigger to engage the sear in the sear notch when the hammer is fully cocked, the improvement which comprises a vertically disposed and movable trigger bar pivotally connected to the trigger, the upper end portion of the trigger bar being disposed in front of the hammer, said trigger bar being moved vertically from its lower position to its upper position when the trigger is rotated from its rest position to its ready-to-fire position, trigger bar blocking means engaging the upper end of the trigger bar and preventing upward movement of the trigger bar when the hammer is at rest, and hammer blocking means engaging the hammer and preventing forward movement of the hammer and firing pin against a cartridge in the chamber when the trigger bar is at its lower position, the upper end portion of the trigger bar being positioned relative to the hammer so that the hammer and firing pin can strike and fire a cartridge in the chamber when the trigger bar is at its upper position.
Claim 2
Dependent Claim
264 words
In a firearm having an external pivotally mounted hammer that is adapted to be manually cocked, a trigger pivotally mounted below the hammer, a cartridge-receiving chamber in front of the hammer, a firing pin associated with the hammer and mounted in position to strike and fire a cartridge in the chamber, a cam surface on the hammer which contacts and rotates the trigger from its rest position to its ready-to-fire positiOn as the hammer is being cocked, a sear notch in the hammer, a sear for the trigger, and spring means which turns the trigger to engage the sear in the sear notch when the hammer is fully cocked, the improvement which comprises a vertically disposed and movable trigger bar pivotally connected to the trigger, the upper end portion of the trigger bar being disposed in front of the hammer, said trigger bar being moved vertically from its lower position to its upper position when the trigger is rotated from its rest position to its ready-to-fire position, trigger bar blocking means engaging the upper end of the trigger bar and preventing upward movement of the trigger bar when the hammer is at rest, and hammer blocking means engaging the hammer and preventing forward movement of the hammer and firing pin against a cartridge in the chamber when the trigger bar is at its lower position, the upper end portion of the trigger bar being positioned relative to the hammer so that the hammer and firing pin can strike and fire a cartridge in the chamber when the trigger bar is at its upper position.
Claim 3
Dependent Claim
53 words
The firearm according to claim 1 in which the forward surface of the hammer is formed with a trigger bar notch, said trigger bar notch being adapted to receive and engage the upper end of the trigger bar and to prevent upward movement of the trigger bar when the hammer is at rest.
Claim 4
Dependent Claim
59 words
The firearm according to claim 2 in which the firearm is provided with a spring loaded plunger that bears against a forward facing surface of the upper end portion of the trigger bar, said plunger urging the trigger bar rearwardly so that the upper end thereof is engaged by the trigger bar notch when the hammer is at rest.
Claim 5
Dependent Claim
128 words
The firearm according to claim 1 in which the firing pin is mounted independantly in front of the hammer, said firing pin having a spring which normally presses the firing pin rearwardly out of contact with a cartridge received in the chamber of the firearm and having a rearward extension which normally projects rearwardly into a space directly in front of the hammer, and in which the upper end of the trigger bar is disposed below the firing pin when at its lower position and is disposed between the firing pin and the hammer when at its upper position, said rearward extension of the firing pin engaging the upper end of the trigger bar and preventing upward movement of the trigger bar when the hammer is at rest.
Claim 6
Dependent Claim
62 words
The firearm according to claim 4 in which the firearm is provided with a spring loaded plunger that bears against a forward facing surface of the upper end portion of the trigger bar, said plunger urging the trigger bar rearwardly so that the upper end thereof is disposed rearwardly of the firing pin when the trigger bar is at its upper position.
Claim 7
Dependent Claim
100 words
The firearm according to claim 1 in which the hammer is formed with a forward facing hammer bearing surface that rests against a forwardly immovable hammer stop element of the firearm when the hammer and trigger are at rest with the trigger bar in its lower position, said forwardly immovable hammer stop element being positioned longitudinally with respect to the hammer so as to maintain the hammer and the firing pin associated therewith out of impacting contact with a cartridge received in the chamber of the firearm when said hammer bearing surface rests against said forwardly immovable hammer stop element.
Claim 8
Dependent Claim
86 words
The firearm according to claim 6 in which the upper end of the hammer is provided with a forwardly extending nose portion having a forward facing surface that comprises the hammer bearing surface of the hammer, and in which the frame of the firearm is provided with a rearward facing surface that comprises the hammer stop element of the firearm, said hammer bearing surface resting on said hammer stop element when the hammer and trigger are at rest with the trigger bar in its lower position.
Claim 9
Dependent Claim
138 words
The firearm according to claim 7 in which the firing pin is mounted in the frame of the firearm, in which the hammer hAs a firing pin striking surface that is maintained out of contact with the firing pin when the trigger bar is in its lower position with the hammer bearing surface of the hammer resting against the hammer stop element of the firearm, and in which the upper end of the trigger bar is interposed between the firing pin striking surface of the hammer and the firing pin when the trigger bar is in its upper position whereby impact of the firing pin striking surface against the upper end of the trigger bar is transferred directly to the firing pin thereby causing the firing pin to strike a cartridge received in the chamber of the firearm.
Claim 10
Dependent Claim
76 words
The firearm according to claim 6 in which the hammer has a forward facing surface that comprises the hammer bearing surface of the hammer, and in which the upper end of the trigger bar is provided with a rearward facing surface that comprises the hammer stop element of the firearm, said hammer bearing surface resting on said hammer stop element when the hammer and trigger are at rest with the trigger bar in its lower position.
Claim 11
Dependent Claim
138 words
The firearm according to claim 9 in which the firing pin is mounted independently in front of the hammer, in which the hammer has a firing pin striking surface that is maintained out of contact with the firing pin when the trigger bar is in its lower position with the hammer bearing surface of the hammer resting against the hammer stop element of the firearm, and in which the upper end of the trigger bar is interposed between the firing pin striking surface of the hammer and the firing pin when the trigger bar is in its upper position whereby impact of the firing pin striking surface against the upper end of the trigger bar is transferred directly to the firing pin thereby causing the firing pin to strike a cartridge received in the chamber of the firearm.
Claim 12
Dependent Claim
154 words
The firearm according to claim 6 in which the firing pin is mounted independently in front of the hammer, in which the hammer has a firing pin striking surface and is formed with a trigger bar notch disposed below said firing pin striking surface, said trigger bar notch being adapted to receive the upper end of the trigger bar when the hammer is at rest and being provided with a forward facing surface that comprises the hammer bearing surface of the hammer, and in which the upper end of the trigger bar is provided with a rearward facing surface that comprises the hammer stop element of the firearm, the firing pin striking surface of the hammer being maintained out of contact with the firing pin when the trigger bar is received in the trigger bar notch with the hammer bearing surface of the hammer resting against the hammer stop element of the trigger bar.
Claim 13
Dependent Claim
121 words
The firearm according to claim 11 in which the forward surface of the hammer above the trigger bar notch is formed with a rearwardly extending trigger bar receiving recess of sufficient depth to permit the firing pin striking surface of the hammer to impact against the firing pin when the upper end of the trigger bar is received in said trigger bar receiving recess, and in which the upper end of the trigger bar is disposed in the trigger bar receiving recess of the hammer when the trigger bar is in its upper position whereby impact of the firing pin striking surface against the firing pin causes the firing pin to strike a cartridge received in the chamber of the firearm.
Claim 14
Dependent Claim
249 words
The firearm according to claim 6 in which the firing pin is mounted on the upper end of the hammer, in which the forward surface of the hammer is formed with a trigger bar notch that is adapted to receive the upper end of the trigger bar when the hammer is at rest, said trigger bar notch being provided with a forward facing surface that comprises the hammer bearing surface of the hammer, in which the upper end of the trigger bar is provided with a rearward facing surface that comprises the hammer stop element of the firearm, the firing pin being maintained out of contact with a cartridge received in the chamber of the firearm whEn the trigger bar is in its lower position with the hammer bearing surface of the hammer resting against the hammer stop element of the trigger bar, in which the forward surface of the hammer above the trigger bar notch is formed with a rearwardly extending trigger bar receiving recess of sufficient depth to permit the firing pin to impact against a cartridge received in the chamber of the firearm when the upper end of the trigger bar is received in said trigger bar receiving recess, and in which the upper end of the trigger bar is disposed in said trigger bar receiving recess when the trigger bar is in its upper position whereby the firing pin impacts against a cartridge received in the chamber of the firearm when the firearm is fired.
Claim 15
Dependent Claim
21 words
The firearm according to claim 3 in which the spring loaded plunger is mounted on the firearm below the firing pin.
Claim 16
Dependent Claim
21 words
The firearm according to claim 5 in which the spring loaded plunger is mounted on the firearm below the firing pin.
Claim 17
Dependent Claim
51 words
The firearm according to claim 3 in which the firearm is provided with a spring loaded firing pin mounted in the frame of the firearm, said spring loaded firing pin also serving as the plunger which urges the upper end of the trigger bar into engagement with the trigger bar notch.
Claim 18
Dependent Claim
55 words
The firearm according to claim 3 in which the firearm comprises a single action revolver having a frame and a chambered cylinder rotatably mounted on the frame by means of a cylinder pivot shaft, and in which the spring loaded plunger is disposed in the rearward end of the cylinder pivot shaft of the revolver.
Claim 19
Dependent Claim
55 words
The firearm according to claim 5 in which the firearm comprises a single action revolver having a frame and a chambered cylinder rotatably mounted on the frame by means of a cylinder pivot shaft, and in which the spring loaded plunger is disposed in the rearward end of the cylinder pivot shaft of the revolver.
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |