Patent US5070635A successfully refreshed from Google Patents.
US5070635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Firing chamber safety plug
Assignee: Individual
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Filing: 1991-06-20
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Granted: 1991-12-10
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Expires: 2011-06-20
Abstract
Abstract A safety plug for preventing firearms from being surreptitiously loaded while on display in stores. The plug utilizes an O-ring that serves to firmly hold the safety plug in place. The use of an O-ring eliminates the need for high precision plug dimensions, permitting inexpensive mass production manufacturing techniques. The O-ring fits within a groove that is substantially wider than the thickness of the O-ring which prevents O-ring shearing. Once inserted, the safety plug is entirely within the firing chamber and thus does not interfere with the operating action of the firearm. The plug can only be removed by a cleaning rod inserted through the muzzle to force the plug out of the firing chamber. The use of translucent materials enables the firearm barrel to be inspected and acts as a diffuser to eliminate "hot spots" that commonly result during bore light inspections. An alternative embodiment for semi-automatic firearms provides a visual "safety" as the action remains partially open once the plug is inserted.
Inventors
- 👤 David A. Cvetanovich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:19
CPC Classifications
F; F41; F41A; F41A17/00; F41A17/44
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
192 words
A safety plug for insertion into a firing chamber of a firearm, said firearm having a caliber designation, a barrel, muzzle, action and a chamber with a diameter and length, said safety plug comprising: a cylindrical body portion having a diameter slightly less than the diameter of the firing chamber of said firearm, and having a length slightly less than the length of the firing chamber of said firearm; an O-ring having a diameter and a thickness corresponding to the caliber of said firearm; an O-ring groove, disposed circumferentially on said body portion, having a groove depth less than the thickness of said O-ring, having a groove width that is substantially greater than the thickness of said O-ring, such that when said O-ring is inserted within said O-ring groove and said plug is inserted in the firing chamber of said firearm, said plug is firmly held entirely within said firing chamber thereby permitting the action of said firearm to fully close and thereby rendering said firearm safe until said plug is removed by insertion of a rod into the muzzle of said firearm to push said plug free from said firing chamber.
Claim 2
Dependent Claim
192 words
A safety plug for insertion into a firing chamber of a firearm, said firearm having a caliber designation, a barrel, muzzle, action and a chamber with a diameter and length, said safety plug comprising: a cylindrical body portion having a diameter slightly less than the diameter of the firing chamber of said firearm, and having a length slightly less than the length of the firing chamber of said firearm; an O-ring having a diameter and a thickness corresponding to the caliber of said firearm; an O-ring groove, disposed circumferentially on said body portion, having a groove depth less than the thickness of said O-ring, having a groove width that is substantially greater than the thickness of said O-ring, such that when said O-ring is inserted within said O-ring groove and said plug is inserted in the firing chamber of said firearm, said plug is firmly held entirely within said firing chamber thereby permitting the action of said firearm to fully close and thereby rendering said firearm safe until said plug is removed by insertion of a rod into the muzzle of said firearm to push said plug free from said firing chamber.
Claim 3
Dependent Claim
33 words
The safety plug of claim 2 wherein said body portion is translucent so that the barrel of said firearm can be inspected while said safety plug is in place within said firing chamber.
Claim 4
Dependent Claim
191 words
A safety plug for insertion into a firing chamber of a semi-automatic firearm, said firearm having a caliber designation, a barrel, muzzle, ejector, action and a firing chamber with a diameter and length, said safety plug comprising: a cylindrical body portion having a diameter slightly less than the diameter of the firing chamber of said firearm, and having a length longer than the length of the firing chamber of said firearm; an O-ring having a diameter and a thickness corresponding to the caliber of said firearm; an O-ring groove, disposed circumferentially on said body portion, having a groove depth less than the thickness of said O-ring, having a groove width that is substantially greater than the thickness of said O-ring, wherein once said O-ring is inserted within said O-ring groove and said plug is inserted within said firearm, said plug is firmly held within said firing chamber thereby preventing the action of said firearm from fully closing and thereby rendering said firearm visually and mechanically safe until said plug is removed by insertion of a rod into the muzzle of said firearm to push said plug free from said firing chamber.
Claim 5
Dependent Claim
191 words
A safety plug for insertion into a firing chamber of a semi-automatic firearm, said firearm having a caliber designation, a barrel, muzzle, ejector, action and a firing chamber with a diameter and length, said safety plug comprising: a cylindrical body portion having a diameter slightly less than the diameter of the firing chamber of said firearm, and having a length longer than the length of the firing chamber of said firearm; an O-ring having a diameter and a thickness corresponding to the caliber of said firearm; an O-ring groove, disposed circumferentially on said body portion, having a groove depth less than the thickness of said O-ring, having a groove width that is substantially greater than the thickness of said O-ring, wherein once said O-ring is inserted within said O-ring groove and said plug is inserted within said firearm, said plug is firmly held within said firing chamber thereby preventing the action of said firearm from fully closing and thereby rendering said firearm visually and mechanically safe until said plug is removed by insertion of a rod into the muzzle of said firearm to push said plug free from said firing chamber.
Claim 6
Dependent Claim
27 words
The safety plug of claim 3 wherein said body portion further comprises means for visually identifying at a distance said body portion extending from said firing chamber.
Claim 7
Dependent Claim
39 words
The safety plug of claim 4 wherein said means for visually identifying further comprises a part of said body portion being colored-coded to indicate that said safety plug is within said firing chamber and that said firearm is safe.
Claim 8
Dependent Claim
39 words
The safety plug of claim 3 wherein said body portion further comprises a chamfered end that extends beyond the length of said firing chamber, said chamfered end having sufficient chamfer to prevent interference with the ejector of said firearm.
References Cited (Backward Citations)
US3360880A
Cited
US3382596A
Cited
US3444639A
Cited
US3678609A
Cited
US3848350A
Cited
GB2143623A
Cited
GB2158924A
Cited
USH213H
Cited
GB2200438A
Cited
US4776123A
Cited
US4835894A
Cited
US5014457A
Cited
US4965952A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-09 | 1995-06-10 | 1995-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-09 | 1999-06-10 | 1999-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-09 | 2003-06-10 | 2003-12-10 | $7700.00 | Window Closed / Lapsed |