Patent US3896426A successfully refreshed from Google Patents.
US3896426A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Theft alarm employing self-adjusting disturbance switch
Assignee: Klaxon SA
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Filing: 1973-01-09
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Granted: 1975-07-22
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Expires: 1993-01-09
Abstract
Abstract This invention relates to an alarm device comprising a sensitive element and electric circuit arranged for releasing an alarm signal when the sensitive element is exposed to shocks or vibration. The sensitive element comprises at least one flexible rod adapted to contact an annular abutment, the contact thus formed between the rod and said abutment being inserted in the electric circuit. This device is suitable for protecting rooms, premises or vehicles against intruders.
Inventors
- 👤 Philippe Laurent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:04
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/16; G08B13/1654
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
247 words
A disturbance switch for use in an alarm device comprising at least one element sensitive to shocks and vibration, and electric means, said sensitive element comprising at least one rod having a circular cross-sectional contour and one end fitted in a frame structure to assume a generally upright position, said rod having flexibility characteristics at least in the vicinity of its fitted end, and an abutment member disposed on said frame structure for limiting the beat of said rod in at least one direction, said abutment member being remote from the fitted end of said rod, at least one portion of said abutment member and at least one portion of said rod which is adapted to contact said abutment member consisting of electrical conducting material, and electric means comprising said portions of said abutment member and rod consisting of electrical conducting material, a source of current and a relay controlling the relasse of an alarm circuit, said relay being so connected to said current source that said relay is closed when a contact takes place between said portions of said abutment member and rod, and remains closed even after said contact is discontinued, the improvement in the disturbance switch comprising said abutment member consisting of an annular member surrounding said rod with a certain clearance and said annular member being adapted to move freely radially with respect to said rod whereupon vibration of said flexible rod self-centers the freely radially moveable annular member about said flexible rod.
Claim 2
Dependent Claim
247 words
A disturbance switch for use in an alarm device comprising at least one element sensitive to shocks and vibration, and electric means, said sensitive element comprising at least one rod having a circular cross-sectional contour and one end fitted in a frame structure to assume a generally upright position, said rod having flexibility characteristics at least in the vicinity of its fitted end, and an abutment member disposed on said frame structure for limiting the beat of said rod in at least one direction, said abutment member being remote from the fitted end of said rod, at least one portion of said abutment member and at least one portion of said rod which is adapted to contact said abutment member consisting of electrical conducting material, and electric means comprising said portions of said abutment member and rod consisting of electrical conducting material, a source of current and a relay controlling the relasse of an alarm circuit, said relay being so connected to said current source that said relay is closed when a contact takes place between said portions of said abutment member and rod, and remains closed even after said contact is discontinued, the improvement in the disturbance switch comprising said abutment member consisting of an annular member surrounding said rod with a certain clearance and said annular member being adapted to move freely radially with respect to said rod whereupon vibration of said flexible rod self-centers the freely radially moveable annular member about said flexible rod.
Claim 3
Dependent Claim
20 words
Disturbance switch according to claim 1, characterised in that said sensitive element comprises two flexible rods having different inherent frequencies.
Claim 4
Dependent Claim
39 words
Disturbance switch according to claim 1 including a metal block of substantially frustoconical configuration, slidably mounted to said flexible rod at the level of said annular abutment, said metal block being adapted to be moved along said flexible rod.
Claim 5
Dependent Claim
23 words
Disturbance switch according to claim 1, characterised in that said flexible rod is provided with an auxiliary weight displaceable along said flexible rod.
Claim 6
Dependent Claim
33 words
Disturbance switch according to claim 1, wherein said flexible rod has its lower end embedded in said frame structure and a displaceable weight is mounted to said flexible rod at its upper end.
Claim 7
Dependent Claim
45 words
Disturbance switch according to claim 4, characterised in that said auxiliary weight consists of a pair of disks having their centers of gravity off-set in relation to the rod axis, said disks being displaceable angularly in relation to each other and along said flexible rod.
Claim 8
Dependent Claim
14 words
Disturbance switch according to claim 1 characterised in that said flexible rod is telescopic.
Claim 9
Dependent Claim
44 words
Disturbance switch according to claim 1 characterised in that the inherent frequency of said flexible rod is adjusted to a value slightly lower or slightly greater than the inherent frequency value of the partition, wall or panel on which the sensitive element is mounted.
Claim 10
Dependent Claim
52 words
Disturbance switch according to claim 2 characterised in that one of the pair of flexible rods has a higher inherent frequency and a lower clearance in relation to its annular abutment, and that the other flexible rod has a lower inherent frequency and a greater clearance in relation to its annular abutment.
Claim 11
Dependent Claim
106 words
Distrubance switch according to claim 2 characterised in that said relay controls the actuation of at least one alarm circuit, said relay comprising a coil adapted to actuate a pair of contacts, the terminals of said coil being connected the one to the source of current and the other on the one hand to one of the pair of flexible rods and abutment associated therewith and on the other hand to one contact of said pair of contacts of said relay, the other contact of said pair being inserted in said alarm circuit, to the other of the pair of flexible rods and abutment associated therewith.
Claim 12
Dependent Claim
47 words
Disturbance switch according to claim 10, including timer means for discontinuing operations of the alarm device wherein said relay is provided with a timing device inserted between said coil of said relay and the contact of said relay which is adapted to receive the relay energizing current.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |