| 摘要 |
<p>An anti-theft alarm device for a video cassette recorder comprises a housing in which is mounted an abutment member pivotal between an inoperative position within the housing and an operative position projecting from the housing by appropriate operation of an associated control mechanism. On location of the housing in the cassette-receiving mechanism of a recorder and with the abutment member in its operative position, said member co-operates with the recorder such as to prevent removal of the housing other than by actuation of the control mechanism. Also mounted in the housing is a battery-operated electrical switching mechanism including a movement-sensitive electric switch movable between an inoperative position and an operative position and a warning mechanism the circuit of which is completed on movement of the switch to its operative position.</p> |
