Patent US4812824A successfully refreshed from Google Patents.
US4812824A
Expired / Lapsed
US
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Pendulum alarm sensor
Assignee: Alarm Accessory Ltd
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Filing: 1987-10-09
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Granted: 1989-03-14
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Expires: 2007-10-09
Abstract
Abstract A housing contains a mercury tilt switch in electrical connection with an alarm circuit and has two, relatively long, highly flexible insulated lead wires extending from the tilt switch and housing and being in electrical connection with an alarm within the circuit. The lead wires support the housing containing the switch and extend upwardly therefrom to a support affixed to a window frame or the like, and then are connected to the alarm. The lead wires are at least ten feet long, preferably about fifteen feet long, with the housing and switch being supported by the lead wires in pendulum-like fashion adjacent to, but not contacting, the window. When a disturbance such as an intruder enters the window, the pendulum-like apparatus is disturbed and the alarm is sounded.
Inventors
- 👤 William Holt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:08
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/02; G08B13/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
129 words
An alarm sensor comprising a housing containing a mercury tilt switch in electrical connection with an alarm circuit, two highly flexible insulated lead wires extending from said tilt switch and housing and being in electrical connection with alarm means within said circuit, said lead wires also supporting said housing containing said switch and extending upwardly therefrom to a support affixed to a window frame or the like, and thence connected to said alarm circuit, said lead wires being at least ten feet long, said housing and switch being supported by said lead wires in pendulum-like fashion adjacent to, but not contacting, a window within said frame, whereby, when a disturbance occurs such as an intruder entering said window, said housing and switch are disturbed and said alarm is sounded.
Claim 2
Dependent Claim
129 words
An alarm sensor comprising a housing containing a mercury tilt switch in electrical connection with an alarm circuit, two highly flexible insulated lead wires extending from said tilt switch and housing and being in electrical connection with alarm means within said circuit, said lead wires also supporting said housing containing said switch and extending upwardly therefrom to a support affixed to a window frame or the like, and thence connected to said alarm circuit, said lead wires being at least ten feet long, said housing and switch being supported by said lead wires in pendulum-like fashion adjacent to, but not contacting, a window within said frame, whereby, when a disturbance occurs such as an intruder entering said window, said housing and switch are disturbed and said alarm is sounded.
Claim 3
Dependent Claim
14 words
The sensor of claim 1 wherein said lead wires are approximately fifteen feet long.
Claim 4
Dependent Claim
24 words
The sensor of claim 1 wherein said alarm circuit is normally open and is closed by disturbance of said switch, thereby sounding said alarm.
Claim 5
Dependent Claim
24 words
The sensor of claim 1 wherein said alarm circuit is normally closed and is opened by disturbance of said switch, thereby sounding said alarm.
Claim 6
Dependent Claim
40 words
The sensor of claim 1 wherein said alarm circuit includes radio transmitting means in proximity to said window and radio receiving means in proximity to said alarm, whereby said disturbance sounds said alarm at a location remote from said window.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-13 | 1992-09-12 | 1993-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-13 | 1996-09-12 | 1997-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-13 | 2000-09-12 | 2001-03-14 | $7700.00 | Window Closed / Lapsed |