Enhanced movement detection arrangement

Details Enhanced movement detection arrangement Enhanced movement detection arrangement

1999-01-13

2000-04-25

Tong, Nina

Communications: electrical

Condition responsive indicating system

Specific condition

340571, 3406861, 340689, G08B 1314

Patent

active

06054922&

ABSTRACT:
An anti-theft arrangement includes a sensor (10) that has a conductive seat (22) connected to a first electrical contact (32). The seat (22) has an opening (34) therethrough. The sensor (10) further has a deflectable, conductive cantilever spring (20) connected to a second electrical contact (36). A conductive plate (26) is disposed between the spring (20) and the seat (22). The conductive plate (26) is in constant electrical communication with the spring (20) and is urged in a direction toward the seat (22) by the spring (20). The plate (26) is movable from a switch-off position in which the seat (22) is spaced away from the plate (26), to a switch-on position in which the plate (26) electrically communicates the spring (20) with the seat (22). The sensor (10) further includes an insulating foot (24) fastened to a lower surface of the plate (26), and which has a frusto-conical base (44) locatable directly on a surface of a support member (14). The base (44) tapers away from the surface of the support member (14), and includes a base edge that forms essentially a step-free transition with the surface, so as to prevent the sliding of an object beneath the insulating foot (24). Any sliding movement causes the insulating foot (24) and the plate (26) to tilt, thereby moving the plate (26) from the switch-off position to the switch-on position. Further, lifting of the sensor (10) away from the surface of the support member (14) allows the spring (20) to urge the plate (26) from the switch-off position and into the switch-on position.

REFERENCES:
patent: 4540269 (1985-09-01), Nishiyama
patent: 4847597 (1989-07-01), Dobosi et al.
patent: 4985695 (1991-01-01), Wilkinson et al.
patent: 5574786 (1996-11-01), Dayan et al.
patent: 5578991 (1996-11-01), Scholder
patent: 5730009 (1998-03-01), Westfield
patent: 5754108 (1998-05-01), Ungarsohn
patent: 5760690 (1998-06-01), French

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