US3690286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hair trigger burglar alarm
Assignee: Individual
•
Filing: 1971-07-26
•
Granted: 1972-09-12
•
Expires: 1991-07-26
Abstract
Abstract A burglar alarm for detecting the unauthorized opening of a door or window in a building comprises a unitary, compact structure for attachment of the alarm with an actuating cable or chain connected in a manner to trigger the alarm upon very slight opening of the door or window. A horn and a can of pressurized fluid are mounted adjacent each other on a frame with a connection for the flow of pressurized fluid from the can to the horn when a normally closed valve is opened. A spring is biased in a manner to cause opening of the valve when the spring bias is released. A lever normally holds the spring in biased position with an arrangement whereby the slightest pull on the lever by the flexible connection to the door or window causes release of the spring and actuation of the horn.
Inventors
- 👤 Kenneth T Gantt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:24
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/02; G08B13/08; Y; Y10; Y10T; Y10T74/00; Y10T74/11
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
203 words
A burglar alarm adapted for mounting on or adjacent a closing device adapted normally to close an opening in a building such as a door or a window, comprising a unitary structure including a frame for attachment of the alarm in a fixed position, an assembly of a horn and a can of pressurized fluid having a discharge neck and a flow connection communicating between said can neck and said horn mounted on said frame, there being a normally closed valve in said can neck preventing discharge of said pressure fluid, an actuating member on said frame operatively connected to cause opening of said valve, spring means mounted on said frame operatively associated with said actuating member and biased in a direction to cause opening of said valve, restraining means on said frame normally holding said spring means biased including a support approximating a point in engagement with said restraining means, and means attached to said restraining means in a manner to be pulled from its holding position by opening movement of said closing device, whereby slight opening movement of said closing device will cause release of said restraining means, whereupon said spring will open said valve and cause said horn to sound.
Claim 2
Dependent Claim
203 words
A burglar alarm adapted for mounting on or adjacent a closing device adapted normally to close an opening in a building such as a door or a window, comprising a unitary structure including a frame for attachment of the alarm in a fixed position, an assembly of a horn and a can of pressurized fluid having a discharge neck and a flow connection communicating between said can neck and said horn mounted on said frame, there being a normally closed valve in said can neck preventing discharge of said pressure fluid, an actuating member on said frame operatively connected to cause opening of said valve, spring means mounted on said frame operatively associated with said actuating member and biased in a direction to cause opening of said valve, restraining means on said frame normally holding said spring means biased including a support approximating a point in engagement with said restraining means, and means attached to said restraining means in a manner to be pulled from its holding position by opening movement of said closing device, whereby slight opening movement of said closing device will cause release of said restraining means, whereupon said spring will open said valve and cause said horn to sound.
Claim 3
Dependent Claim
36 words
A burglar alarm as defined in claim 1, wherein said restraining means comprises a lever, and said support is a needle point on said frame maintaining said lever in a position holding said spring means biased.
Claim 4
Dependent Claim
39 words
A burglar alarm as defined in claim 1, wherein said restraining means comprises a lever, and said support is a wedge inserted between said lever and said frame maintaining said lever in a position holding said spring means biased.
Claim 5
Dependent Claim
61 words
A burglar alarm as defined in claim 1, wherein said restraining means comprises a lever, and said support is a projection on said lever effective between said frame and said actuating member for holding said spring means biased, and said projection movable to an ineffective position by a pull on said attached means caused by opening movement of said closing device.
Claim 6
Dependent Claim
54 words
A burglar alarm as defined in claim 1, wherein said actuating member is a plunger, means on said frame mounting said plunger for reciprocation into and out of engagement with said normally closed valve, and a seal between said last named means and said plunger preventing leaking of pressure fluid from said flow connection.
Claim 7
Dependent Claim
89 words
A burglar alarm as defined in claim 1, wherein said horn is substantially rigidly connected near one end to said can discharge neck, said valve is of the tilt-opening type and normally closed when said neck is in axially straight position, said actuating member is connected to said horn at a point spaced from said neck connection, said neck is axially straight in biased position of said spring means, and said spring means when released from said restraining means causing said horn to tilt said valve to open position.
References Cited (Backward Citations)
US60897A
Cited
US301862A
Cited
US2570438A
Cited
US2793651A
Cited
US3185127A
Cited
US3244137A
Cited
US3391367A
Cited
US3451369A
Cited
US3561395A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |