US4709496A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety device including chamber probe
Assignee: Individual
•
Filing: 1986-12-18
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Granted: 1987-12-01
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Expires: 2006-12-18
Abstract
Abstract A safety device for use with a repeating firearm having a magazine well for holding a box-like removable magazine, to prevent the firearm from being fired unintentionally and for providing an indication visible at some distance that the firearm is in a safe condition. A main body of the device corresponds in size with the magazine for the weapon and includes a top portion which extends into the space left open between the breech and the face of the bolt of the weapon when the bolt is withdrawn. A plunger slidably disposed within the main body is connected with a movable chamber probe which would be prevented from entering the chamber by a round of ammunition, and which prevents the plunger from being moved to a position latching the device in the firearm unless the probe is able to enter the firing chamber. Visible exposure of more than a predetermined portion of the safety device indicates that the safety device is not properly installed in the weapon and that the weapon is therefore not to be considered safe.
Inventors
- 👤 David A. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:11
CPC Classifications
F; F41; F41A; F41A17/00; F41A17/44
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
127 words
A safety device for use in a repeating firearm of the type having a chamber for holding a cartridge during firing, a bolt reciprocatingly movable between a closed position necessary for the firearm to be fired and an open position which prevents firing, and having a magazine well including an opening for receiving a magazine therein, the safety device comprising: (a) a main body capable of fitting within said magazine well; (b) movable chamber probe means associated with said main body for detecting the presence of an object in the chamber of said firearm; and (c) movable indicator means, associated with said main body and connected with said chamber probe means, for providing a visible indication when said chamber probe means encounters an object in said chamber.
Claim 2
Dependent Claim
127 words
A safety device for use in a repeating firearm of the type having a chamber for holding a cartridge during firing, a bolt reciprocatingly movable between a closed position necessary for the firearm to be fired and an open position which prevents firing, and having a magazine well including an opening for receiving a magazine therein, the safety device comprising: (a) a main body capable of fitting within said magazine well; (b) movable chamber probe means associated with said main body for detecting the presence of an object in the chamber of said firearm; and (c) movable indicator means, associated with said main body and connected with said chamber probe means, for providing a visible indication when said chamber probe means encounters an object in said chamber.
Claim 3
Dependent Claim
69 words
The safety device of claim 1, wherein said indicator means includes a plunger member disposed slidably in said main body and connected with said chamber probe means so as to cause said plunger member to extend outward from said main body beyond a predetermined position when said main body is located within said magazine well, unless said chamber probe means is fully extended into said chamber of said firearm.
Claim 4
Dependent Claim
59 words
The safety device of claim 2, further including elastic biasing means for urging said plunger member visibly outward from said main body, and detent means for engaging a magazine latch of said firearm to hold said main body in said magazine well and said plunger member in said main body when said probe means is extended into said chamber.
Claim 5
Dependent Claim
25 words
The safety device of claim 2, including resilient biasing means for urging said plunger toward an outwardly extended position with respect to said main body.
Claim 6
Dependent Claim
51 words
The safety device of claim 4, further including detent means for engaging said firearm and holding said safety device with said main body located in said magazine well and said plunger in an inwardly located position indicating a safe condition of said firearm when said probe is extended into said chamber.
Claim 7
Dependent Claim
92 words
The safety device of claim 5 wherein said firearm includes a magazine latch, said detent means includes a detent located on said plunger in position to cooperate with said magazine latch of said firearm, said main body defining a cavity and said plunger being slidably disposed at least partially therein, and said biasing means including a spring located within said cavity and disposed between said plunger and said main body, urging said main body into said magazine well when said detent is in latching engagement with said magazine latch of said firearm.
Claim 8
Dependent Claim
46 words
The safety device of claim 2 wherein said plunger includes a base portion which fits closely adjacent the opening of said magazine well, closingly covering said magazine well when said chamber probe is fully extended when said main body is located properly within said magazine well.
Claim 9
Dependent Claim
48 words
The safety device of claim 1 wherein said plunger includes a base portion attached thereto which fits closely adjacent the opening of said magazine well, closingly covering said magazine well when said chamber probe is fully extended when said main body is located properly within said magazine well.
Claim 10
Dependent Claim
42 words
The safety device of claim 1 including means for holding said chamber probe means retracted toward said main body far enough not to cause interference between said safety device and said firearm during insertion of said safety device into said magazine well.
Claim 11
Dependent Claim
55 words
The safety device of claim 9 wherein said means for holding said chamber probe means retracted includes a spring disposed within said main body and acting upon said main body and said indicator means, urging said indicator means toward a position in which said indicator means retracts said chamber probe means into said main body.
Claim 12
Dependent Claim
62 words
The safety device of claim 9 including detent means associated with said indicator means, for engaging said firearm and holding said safety device in place within said magazine well when said chamber probe means is extended, and means interconnecting said chamber probe means with said indicator means, for preventing engagement of said detent means unless said chamber probe means is fully extended.
Claim 13
Dependent Claim
48 words
The safety device of claim 1 wherein said chamber probe means includes a metal cable connected with said movable indicator means, said cable including a first end which extends into said chamber when said chamber is unobstructed and said safety device is inserted properly into said magazine well.
Claim 14
Dependent Claim
58 words
The safety device of claim 12 including a tip member attached fixedly to said first end of said cable, said tip member having a diameter great enough to prevent said probe means from entering said chamber when a cartridge is located therein and to prevent said cable from being retracted into said main body beyond a predetermined location.
Claim 15
Dependent Claim
42 words
The safety device of claim 12 wherein said main body defines an arcuate passageway and said cable includes a second end connected with said indicator means, said cable extending through said arcuate passageway from said indicator means to said first end thereof.
Claim 16
Dependent Claim
61 words
The safety device of claim 1 wherein said main body includes top portion means for preventing said bolt from moving from the open position to the closed position when said main body is properly located within said magazine well, and for preventing said main body from being inserted fully into said magazine well when said bolt is in said closed position.
Claim 17
Dependent Claim
48 words
The safety device of claim 15 wherein said chamber probe means includes a metal cable connected with said movable indicator means, said cable including a first end which extends into said chamber when said chamber is unobstructed and said safety device is inserted properly into said magazine well.
Claim 18
Dependent Claim
58 words
The safety device of claim 16, including a tip member attached fixedly to said first end of said cable, said tip member having a diameter great enough to prevent said probe means from entering said chamber when a cartridge is located therein and to prevent said cable from being retracted into said main body beyond a predetermined location.
Claim 19
Dependent Claim
42 words
The safety device of claim 16 wherein said main body defines an arcuate passageway and said cable includes a second end connected with said indicator means, said cable extending through said arcuate passageway from said indicator means to said first end thereof.
Claim 20
Dependent Claim
21 words
The safety device of claim 1 including flexible connector means for connecting said movable chamber probe means with said indicator means.
References Cited (Backward Citations)
US4528765A
Cited
US4619062A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-30 | 1991-06-01 | 1991-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-30 | 1995-06-01 | 1995-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-30 | 1999-06-01 | 1999-12-01 | $7700.00 | Window Closed / Lapsed |