US3695212A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Burglar alarm fixed to door or the like
Assignee: Individual
•
Filing: 1970-10-22
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Granted: 1972-10-03
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Expires: 1990-10-22
Abstract
Abstract A burglar alarm is provided for use in connection with a door or other closure member for a building opening. A casing embedded in the door intermediate its inside and outside faces opens at that edge of the door which is presented to the frame when the door is closed. A plunger is slidably mounted in the casing and provided with a lock or keeper which either holds the plunger locked in an inoperative position approximately flush with the edge of the door and which, in unlocked position, is pushed outwardly by a spring in an abutting position against the door frame. If the door is opened by an unauthorized person while the plunger is in its unlocked condition, then the plunger is pushed outwardly by the spring and is operatively connected with an actuator which sounds an alarm. The plunger lock is preferably a Yale-type lock having two identical plugs which are turnable by a bitted key to turn the keeper between locked and unlocked positions. By this arrangement, the same key may be utilized to manipulate the keeper either from inside or outside the door.
Inventors
- 👤 Kenneth T Gantt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:12
CPC Classifications
E; E05; E05B; E05B45/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
203 words
A burglar alarm for use in association with a closure member oscillatable in a building opening which has a frame member against which said closure member approximately abuts when in its closed position, comprising an alarm having an actuator movable between ''''off'''' and ''''on'''' positions, a trigger mounted in one of said members in position abutting said other member when said closure member is in said closed position, means urging said trigger toward said abutting position, a keeper operatively associated with said trigger in one position to restrain it against said urging means, an operative connection between said trigger and said actuator, lock means operatively associated with said keeper having a first position for holding said trigger in said one inoperative position corresponding to said actuator in ''''off'''' position and non-responsive to said urging means, and said lock means having a second position moving said keeper to a non-restraining position and releasing said trigger to the action of said urging means for free movement to an operative position in the direction of said abutting position responsive to said urging means upon oscillation of said closure member toward its open position, said operative position of said trigger corresponding to ''''on'''' position of said actuator.
Claim 2
Dependent Claim
203 words
A burglar alarm for use in association with a closure member oscillatable in a building opening which has a frame member against which said closure member approximately abuts when in its closed position, comprising an alarm having an actuator movable between ''''off'''' and ''''on'''' positions, a trigger mounted in one of said members in position abutting said other member when said closure member is in said closed position, means urging said trigger toward said abutting position, a keeper operatively associated with said trigger in one position to restrain it against said urging means, an operative connection between said trigger and said actuator, lock means operatively associated with said keeper having a first position for holding said trigger in said one inoperative position corresponding to said actuator in ''''off'''' position and non-responsive to said urging means, and said lock means having a second position moving said keeper to a non-restraining position and releasing said trigger to the action of said urging means for free movement to an operative position in the direction of said abutting position responsive to said urging means upon oscillation of said closure member toward its open position, said operative position of said trigger corresponding to ''''on'''' position of said actuator.
Claim 3
Dependent Claim
70 words
A burglar alarm as defined in claim 1, wherein said closure member is a door having outside and inside faces, said lock means comprises two key-operated lock structures, one accessible by key from said outside face only and the other accessible by key from said inside face only and said lock structures each operable regardless of whether said lock means is in said first position or in said second position.
Claim 4
Dependent Claim
26 words
A burglar alarm as defined in claim 2, wherein said two lock structures are substantially identical, whereby the lock structures are operable by the same key.
Claim 5
Dependent Claim
117 words
A burglar alarm as defined in claim 3, whErein said two lock structures are of the Yale lock type each having a key-rotatable cylindrical plug having radially movable pins key-actuated between locked and unlocked positions, said lock means including an axially rotatable locking member in one rotated position interengaging said trigger in its said first position, said locking member having a second rotated position free of said trigger in its said second position, said lock means including a case holding said plugs and said locking member axially aligned, and said key when fully inserted in either of said plugs having a portion engaging said locking member whereby to rotate the latter upon key-rotation of the associated plug.
Claim 6
Dependent Claim
92 words
A burglar alarm as defined in claim 1, wherein said trigger comprises a cylindrical casing closed at one end and open at the other end, a plunger in said casing and slidable longitudinally thereof, said urging means comprises a compression spring between said closed end of said casing and said plunger for urging said plunger out of said open end of said casing, there being an opening crosswise through said casing at right angles to the axis of said casing, and said lock means comprises a keeper extending through said crosswise opening.
Claim 7
Dependent Claim
131 words
A burglar alarm as defined in claim 5, wherein said closure member is a door having outside and inside faces, said lock means comprises two lock structures, each having a rotatable locking plug, said plugs being cylinders of the same diameter, and said keeper is between said plugs and is of a size to pass through an opening snugly receiving a cylinder of said plug diameter, whereby a cylindrical hole may be bored in said door from one edge thereof parallel to and intermediate the faces of the door to snugly receive the full length of said cylindrical casing, and a second cylindrical hole may be bored through said door crosswise of said first hole and registering with said opening through said casing to snugly receive said plugs and said keeper.
Claim 8
Dependent Claim
61 words
A burglar alarm as defined in claim 1, wherein said alarm is a gas-operated horn, a pressure container is mounted on one of said closure members, a communicating passageway is provided between said container and said horn, a control valve is provided in said passageway, and said actuator is a valve control member operatively connected between said valve and said trigger.
Claim 9
Dependent Claim
28 words
A burglar alarm as defined in claim 1, including a manually resettable detent automatically holding said trigger in operative position, after movement thereof, until said detent is reset.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |