| 摘要 |
Vehicle security apparatus includes a tubular housing, a lock barrel having a rotary lock cylinder that controls a retractable latch, the barrel being slidably received in the housing bore and movable between an unlocked extended position and a locked retracted position within the bore. There is also a spring positioned in the housing bore which biases the barrel toward its extended position and detents for establishing the extended and retracted positions of the barrel by engagement with the barrel latch. The barrel is rotatable within the housing to a release position when the barrel is not in its locked position so that the latch no longer engages the detents, enabling the barrel to be pulled entirely out of the housing. The lock barrel also operates a switch for enabling an alarm signal circuit which produces an alarm signal in response to an intrusion noise within a selected frequency band. That circuit also generates an alarm disable signal in certain circumstances and a signal for indicating whether the apparatus is enabled or disabled. |
