US4776123A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety plug for firing chambers of guns
Assignee: Individual
•
Filing: 1987-10-13
•
Granted: 1988-10-11
•
Expires: 2007-10-13
Abstract
Abstract A safety device for use with a gun of a type which fires a conventional cartridge casing having an annular rim portion which cooperates with an ejector mechanism of the gun to unload the cartridges. The safety device includes a body portion having a neck portion extending from one end and a rear portion at an other end. The plug is inserted into a firing chamber of a gun with the neck portion extending into a bore of a barrel of a gun. The neck portion has a diameter slightly greater than the inner diameter of the bore to provide a press fit. The rear portion of the plug has a cylindrical portion having a diameter less than the diameter of the annular rim portion of a suitable cartridge casing such that the ejector mechanism of the gun cannot engage and eject the plug from the firing chamber. The plug is, thus, fixedly inserted into the firing chamber of the gun so that the gun cannot be accidentally loaded or fired.
Inventors
- 👤 Ralph W. Ascroft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:27
CPC Classifications
F; F41; F41A; F41A17/00; F41A17/44
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
210 words
A safety device for preventing the loading of a cartridge into a gun, said cartridge having an annular rim portion having a first predetermined diameter, said gun having a chamber for accepting said cartridge for firing and a barrel having a bore having a second predetermined diameter, said bore communicating with said chamber, said gun having an ejector member and a firing pin, said ejector member engaging said rim portion for ejecting said cartridge, said safety device comprising: a plug adapted to be received within said chamber of said gun, said plug including a body having a cylindrical neck portion at one end and a cylindrical rear portion at an other end, said rear portion having a flat surface extending normal to a longitudinal axis of said plug and adapted to contact said firing pin when said gun is fired, said neck portion having a third predetermined diameter slightly larger than said second predetermined diameter of said bore, said neck portion being press fit into said bore, said body being adapted to be freely received in said firing chamber, said rear end portion having a fourth predetermined diameter less than said first predetermined diameter of said cartridge such that said ejector member of said gun does not contact said plug.
Claim 2
Dependent Claim
210 words
A safety device for preventing the loading of a cartridge into a gun, said cartridge having an annular rim portion having a first predetermined diameter, said gun having a chamber for accepting said cartridge for firing and a barrel having a bore having a second predetermined diameter, said bore communicating with said chamber, said gun having an ejector member and a firing pin, said ejector member engaging said rim portion for ejecting said cartridge, said safety device comprising: a plug adapted to be received within said chamber of said gun, said plug including a body having a cylindrical neck portion at one end and a cylindrical rear portion at an other end, said rear portion having a flat surface extending normal to a longitudinal axis of said plug and adapted to contact said firing pin when said gun is fired, said neck portion having a third predetermined diameter slightly larger than said second predetermined diameter of said bore, said neck portion being press fit into said bore, said body being adapted to be freely received in said firing chamber, said rear end portion having a fourth predetermined diameter less than said first predetermined diameter of said cartridge such that said ejector member of said gun does not contact said plug.
Claim 3
Dependent Claim
23 words
The safety device as claimed in claim 1 having a cavity axially extending from said neck portion into said body of said plug.
Claim 4
Dependent Claim
16 words
The safety device as claimed in claim 2 wherein said body has a fifth predetermined diameter.
Claim 5
Dependent Claim
28 words
The safety device as claimed in claim 3 wherein said fourth predetermined diameter of said cylindrical rear portion is less than said fifth predetermined diameter of said body.
Claim 6
Dependent Claim
26 words
The safety device as claimed in claim 3 wherein said second predetermined diameter of said bore is less than said fifth predetermined diameter of said body.
Claim 7
Dependent Claim
17 words
The safety device as claimed in claim 1 wherein said plug is formed of a resilient material.
Claim 8
Dependent Claim
197 words
A safety device for preventing the loading of a cartridge into a gun, said cartridge having an annular rim portion having a first predetermined diameter, said gun having a chamber for accepting said cartridge for firing, said chamber having a second predetermined diameter, said gun having a firing pin and a movable ejector member engaging said rim portion for ejecting said cartridge, said safety device comprising: a body having a rear end portion having a cylindrical surface and a rim portion, said body and said cylindrical surface having a third predetermined diameter slightly larger than said second predetermined diameter of said chamber, said body being press fit into said chamber, said rim portion having a fourth predetermined diameter, said fourth predetermined diameter being greater than said third predetermined diameter, said rim portion extending radially outwardly from said rear portion encircling less than half of the circumference of said body, said rim portion engaging said gun to retain said plug in position within said chamber, said plug being mountable within said chamber with said cylindrical surface being adjacent to said ejector member, such as to permit free clearance of said ejector member when said ejector member is moved.
Claim 9
Dependent Claim
197 words
A safety device for preventing the loading of a cartridge into a gun, said cartridge having an annular rim portion having a first predetermined diameter, said gun having a chamber for accepting said cartridge for firing, said chamber having a second predetermined diameter, said gun having a firing pin and a movable ejector member engaging said rim portion for ejecting said cartridge, said safety device comprising: a body having a rear end portion having a cylindrical surface and a rim portion, said body and said cylindrical surface having a third predetermined diameter slightly larger than said second predetermined diameter of said chamber, said body being press fit into said chamber, said rim portion having a fourth predetermined diameter, said fourth predetermined diameter being greater than said third predetermined diameter, said rim portion extending radially outwardly from said rear portion encircling less than half of the circumference of said body, said rim portion engaging said gun to retain said plug in position within said chamber, said plug being mountable within said chamber with said cylindrical surface being adjacent to said ejector member, such as to permit free clearance of said ejector member when said ejector member is moved.
References Cited (Backward Citations)
US2530560A
Cited
US2985979A
Cited
US3154874A
Cited
US3193959A
Cited
US3444639A
Cited
US3553877A
Cited
US3678609A
Cited
US3673725A
Cited
US4014123A
Cited
US4398366A
Cited
US4512099A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-11 | 1992-04-11 | 1992-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-11 | 1996-04-11 | 1996-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-11 | 2000-04-11 | 2000-10-11 | $7700.00 | Window Closed / Lapsed |