Motion detectors and security devices incorporating same
First Claim
1. A motion detector comprisinga container having a conductive inner surface forming a first element,a conductive member contacting said conductive inner surface and forming a second element,a tether connecting said conductive member to said container, said tether being spaced from said conductive surface and providing means mounting said elements for relative movement with respect to each other in response to movement of the container,said conductive inner surface and said tether being, respectively, connected in series across an electrical potential,whereby a motion signal is produced by an increase in resistance between said conductive member and said conductive inner surface when there is movement of said container.
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Accused Products
Abstract
A security device for the prevention of theft is described. It comprises an alarm, a motion detector which provides a signal, effective through an electrical circuit for actuation of the alarm. The motion detector includes a tubular cylinder, a sphere and a tether which are conductive and connected in series across an electrical potential. Movement of the detector, from any initial orientation and in any direction results in an increase in contact resistance between the sphere and cylinder and generates a motion signal. After actuation of an arming switch, a motion signal energizes the alarm. Once armed, a disarming switch must be actuated to prevent or halt energization of the alarm. The device is detachably mounted on a brief case, with the switches on the exterior and connected by conductors to the remaining elements of the device mounted on the interior of the brief case. Delay means enable the brief case to be moved after arming and before disarming, without sounding the alarm, to facilitate its storage and retrieval. In an alternate embodiment, a switch, mounted on a flexible conductor permits energization of the alarm independently of the motion signal responsive means.
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Citations
20 Claims
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1. A motion detector comprising
a container having a conductive inner surface forming a first element, a conductive member contacting said conductive inner surface and forming a second element, a tether connecting said conductive member to said container, said tether being spaced from said conductive surface and providing means mounting said elements for relative movement with respect to each other in response to movement of the container, said conductive inner surface and said tether being, respectively, connected in series across an electrical potential, whereby a motion signal is produced by an increase in resistance between said conductive member and said conductive inner surface when there is movement of said container.
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17. A brief case, in combination with a security device,
said brief case having opening-defining portions movable between a juxtaposed, closed position and a spaced, open position, said security device comprising an alarm, a motion detector and electrical means for energizing the alarm in response to a motion signal from said detector, switch means for controlling said electrical means, and conductor means interconnecting said switch means and electrical means, characterized in that the switch means are detachably mounted on the exterior of said brief case, the alarm, the motion detector and the electrical means are detachably mounted interiorly of said brief case, and the conductor means extends between the juxtaposed portions of the brief case in their closed position, whereby the security device may be removed from the brief case and used in combination with another brief case or for other security purposes.
Specification