| 摘要 |
<p>ACCESS ALARM 5 An alarm system comprises a tripwire having at least one end attached to a detection assembly comprising an elongate shank, a housing supporting the elongate shank, a coil spring mounted on the shank which provides a restoring force to movement of the shank outwardly from the housing, a micro switch operatively associated with the shank and an alarm electrically connected to 10 the micro switch such that tripping of the wire activates the alarm. 4 8 61- 59 60- 53 -48 64 T ------L1 24--- F IG 8A 63)7 70 62 69 48 I63, 24 6171 66 2 18-- - -2 -24 FIG 10</p> |
