| 摘要 |
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 the micro switch such that tripping of the wire activates the alarm. |
