Tamper-proof security alarm system
First Claim
1. A device of the kind described, comprising in combination:
- (a) a casing,(b) an electrical, gravity-responsive switch construction disposed wholly in the casing, said switch construction being open-circuited when motionless and in a given predetermined position, and being closed-circuited when it experiences either acceleration or arcuate movement, or both,(c) suspension means for suspending the switch construction from a pivotal point above the same for free swinging movement, said suspension means enabling the switch construction, under the force exerted thereon by gravity, to occupy an infinitely large number of different arcuate positions within and with respect to the casing,(d) manually releasable clamping means acting on said suspension means, for normally maintaining the switch construction in any given one of said infinitely large number of arcuate positions with respect to the casing, thereby to normally maintain said switch construction open-circuited except when experiencing said acceleration or arcuate movement or both,(e) a second electrical switch construction connected in parallel with the first-mentioned switch construction,(f) means responsive to operation of said manually releasable means, for closing the circuit of said second electrical switch construction,(g) an electro-responsive device, and(h) circuit means connected with both said switch constructions, for controlling said electro-responsive device.
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Accused Products
Abstract
A tamper-proof security alarm system comprising basically a radio transmitter unit to be located at equipment which is to be protected, and a radio receiver unit with alarm and control circuits located at a point remote from the transmitter. The transmitter unit comprises a unique, wholly self-contained, small portable sensing and triggering assemblage constructed in a novel manner by which it is completely, 100 percent tamper-proof. The sensing and triggering assemblage employs an ultra-sensitive, gravity-responsive electrical switch connected to energize the transmitter, said switch incorporating a suspension system with reset means whereby the switch can be properly oriented to take care of various angularities of the supporting surface on which the assemblage is placed. The reset means clamps the switch in any of an infinite number of oriented positions. Whenever the unit is moved, however slightly, the switch closes and energizes the transmitter. A unique system of additional switches, including an on-off switch, is so arranged that the transmitter is also unfailingly excited to send out a pulse whenever any effort is made to disable the unit. Shifting of the on-off switch from the "on" to the "off" position momentarily excites the transmitter, and actuation of the reset mechanism likewise effects an excitation of the transmitter. The receiver at the remote point responds to all signals of any duration from the transmitter, by giving an alarm or effecting a control function.
47 Citations
17 Claims
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1. A device of the kind described, comprising in combination:
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(a) a casing, (b) an electrical, gravity-responsive switch construction disposed wholly in the casing, said switch construction being open-circuited when motionless and in a given predetermined position, and being closed-circuited when it experiences either acceleration or arcuate movement, or both, (c) suspension means for suspending the switch construction from a pivotal point above the same for free swinging movement, said suspension means enabling the switch construction, under the force exerted thereon by gravity, to occupy an infinitely large number of different arcuate positions within and with respect to the casing, (d) manually releasable clamping means acting on said suspension means, for normally maintaining the switch construction in any given one of said infinitely large number of arcuate positions with respect to the casing, thereby to normally maintain said switch construction open-circuited except when experiencing said acceleration or arcuate movement or both, (e) a second electrical switch construction connected in parallel with the first-mentioned switch construction, (f) means responsive to operation of said manually releasable means, for closing the circuit of said second electrical switch construction, (g) an electro-responsive device, and (h) circuit means connected with both said switch constructions, for controlling said electro-responsive device. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A device of the kind described, comprising in combination:
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(a) a casing, (b) an electrical, gravity-responsive switch construction disposed wholly in the casing, said switch construction being open-circuited when motionless and in a given predetermined position, and being closed-circuited when it experiences either acceleration or arcuate movement, or both, (c) suspension means for suspending the switch construction from a pivotal point above the same for free swinging movement, said suspension means enabling the switch construction, under the force exerted thereon by gravity, to occupy an infinitely large number of different arcuate positions within and with respect to the casing, (d) manually releasable clamping means acting on said suspension means, for normally maintaining the switch construction in any given one of said infinitely large number of arcuate positions with respect to the casing, thereby to normally maintain said switch construction open-circuited except when experiencing said acceleration or arcuate movement or both, (e) an electro-responsive device disposed in said casing, having switching circuitry connected with said electrical switch construction, whereby the electro-responsive device is operated when the casing and switch construction experience accleration or arcuate movement, (f) an on-off electrical switch connected in said switching circuitry, said on-off switch including a manually operable switch member having a circuit-closing movement and a circuit-opening movement, (g) a monitoring electrical switch connected with said switching circuitry to switch on the electro-responsive device, and (h) means responsive to circuit-opening movement of said manually operable switch member, for momentarily closing the said monitoring switch to activate the electro-responsive device prior to opening of the circuit by said on-off switch. - View Dependent Claims (9, 10, 11)
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12. A device of the kind described, comprising in combination:
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(a) a casing, (b) an electrical, gravity-responsive switch construction disposed wholly in the casing, said switch construction being open-circuited when motionless and in a given predetermined position, and being closed-circuited when it experiences either acceleration or arcuate movement, or both, (c) suspension means for suspending the switch construction from a pivotal point above the same for free swinging movement, said suspension means enabling the switch construction, under the force exerted thereon by gravity, to occupy an infinitely large number of different arcuate positions within and with respect to the casing, and (d) manually releasable clamping means acting on said suspension means, for normally maintaining the switch construction in any given one of said infinitely large number of arcuate positions with respect to the casing, thereby to normally maintain said switch construction open-circuited except when experiencing said acceleration or arcuate movement or both, (e) said means for suspending the switch construction comprising an upstanding, upwardly-facing pivot member carried by the casing, and a downwardly-facing socket member carried by the switch construction and disposed over the pivot member, (f) said socket member being adapted to hang the switch construction pendant under the pivot member. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification