G - Physics – 08 – B
Patent
G - Physics
08
B
340/125, 349/30,
G08B 13/02 (2006.01) H01H 35/14 (2006.01)
Patent
CA 1085944
ABSTRACT OF THE DISCLOSURE Disclosed herein is a shock- or vibration- sensitive sensor for use as a switch in a security system, comprising a substantially toroidally-shaped body having an inwardly-facing surface area and an electrically conductive outwardly-facing surface area. The body is normally loosely seated upon at least a pair of contact elements within a housing. The contact elements cooperate with the conductive outwardly-facing surface area of the body to normally close an electrical circuit which will be interrupted whenever the body loses contact with at least one of the contact elements due to bouncing motion accompanied by displacement caused by shock or vibration applied to the sensor. A center post loosely extends through the aperture in the body, the center post limiting the range of possible displacement of the body by contac- ting the inwardly-facing surface area of the body upon shock- or vibration-induced displacement of the body. Thus, the center post prevents the conductive outwardly-facing surface area of the body from con- tacting any of the inner surfaces of the housing. In accordance with a specific aspect of the invention, sharp, pointed contact elements are used which penetrate any nonconductive film if present on the conductive outwardly-facing surface area of the body whose mass is of sufficient magnitute to cause such penetration.
271028
Litton Industries Inc.
Macrae & Co.
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