Patent US4501081A successfully refreshed from Google Patents.
US4501081A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry fire unit
Assignee: Individual
•
Filing: 1982-09-29
•
Granted: 1985-02-26
•
Expires: 2002-09-29
Abstract
Abstract A dry fire unit which is placed in a gun in place of the firing pin is provided. The firing pin is removed and an energy-absorbing wedge of the dry fire unit is placed into the gun in lieu of the firing pin such that the dry fire unit is struck by the hammer of the gun when its trigger is pulled. The dry fire unit is an energy-absorbing wedge that allows the gun to be dry fired without cracking or peening the hammer. Further, since the dry fire unit replaces the firing pin, it is not necessary to remove ammunition from the gun since there is no possibility of the gun being fired.
Inventors
- 👤 Michael T. Izumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:39
CPC Classifications
F; F41; F41A; F41A17/00; F41A17/44
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
154 words
In combination with a gun having a frame, a hammer movable from a cocked position to an energy releasing position, a firing pin receiving means in the frame, a cartridge chamber, a removable firing pin assembly including a firing pin and a spring to actuate the firing pin, and said firing pin receiving means terminating in a firing pin hole through which the firing pin may travel to contact and fire a cartridge in the cartridge chamber, a dry firing unit which comprises a shaft of energy absorbing material adapted to be removably disposed in the firing pin receiving means, and a projection at one end of said shaft protruding longitudinally and laterally from said firing pin receiving means in the path of travel of said hammer to contact and absorb energy from said hammer, said unit being shorter in its longitudinal extent into the firing pin receiving means than the firing pin assembly.
Claim 2
Dependent Claim
154 words
In combination with a gun having a frame, a hammer movable from a cocked position to an energy releasing position, a firing pin receiving means in the frame, a cartridge chamber, a removable firing pin assembly including a firing pin and a spring to actuate the firing pin, and said firing pin receiving means terminating in a firing pin hole through which the firing pin may travel to contact and fire a cartridge in the cartridge chamber, a dry firing unit which comprises a shaft of energy absorbing material adapted to be removably disposed in the firing pin receiving means, and a projection at one end of said shaft protruding longitudinally and laterally from said firing pin receiving means in the path of travel of said hammer to contact and absorb energy from said hammer, said unit being shorter in its longitudinal extent into the firing pin receiving means than the firing pin assembly.
Claim 3
Dependent Claim
31 words
A dry firing unit as claimed in claim 1 wherein said shaft has a rounded protruberance at its other end to prevent entry of said shaft into said firing pin hole.
Claim 4
Dependent Claim
29 words
A dry firing unit as claimed in claim 1 wherein said shaft is frictionally engaged in said firing pin receiving means to assist in absorbing energy from said hammer.
Claim 5
Dependent Claim
27 words
A dry firing unit as claimed in claim 1 wherein said shaft has a longitudinal arch to increase its frictional engagement in said firing pin receiving means.
Claim 6
Dependent Claim
28 words
A dry firing unit as claimed in claim 1 wherein said unit is made of a resilient, energy absorbing material which may be molded in a single piece.
Claim 7
Dependent Claim
24 words
A dry firing unit as claimed in claim 1 wherein said unit is readily visible at the opening of saif firing pin receiving means.
Claim 8
Dependent Claim
14 words
A dry firing unit as claimed in claim 1 wherein said unit is colored.
Claim 9
Dependent Claim
26 words
A dry firing unit as claimed in claim 1 wherein the projection at one end has a lip for engagement to grip and remove the unit.
References Cited (Backward Citations)
US109514A
Cited
US282941A
Cited
US365383A
Cited
US624321A
Cited
DE692741C
Cited
US2327334A
Cited
US2405308A
Cited
US3128570A
Cited
US3217441A
Cited
US3444639A
Cited
US3678609A
Cited
US3762089A
Cited
US3760522A
Cited
US3750531A
Cited
US3848350A
Cited
US3838533A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-26 | 1988-08-27 | 1989-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-26 | 1992-08-27 | 1993-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-26 | 1996-08-27 | 1997-02-26 | $7700.00 | Window Closed / Lapsed |