Automobile security system

Vehicle security apparatus of the type including a tubular housing;

• a lock barrel having a rotary lock cylinder that controls a retractable latch, said barrel being slidably received in the housing bore and movable between an unlocked extended position and a locked retracted position within the bore;
• a spring positioned in the housing bore and which biases the barrel toward its extended position;
• detent means for establishing the extended and retracted positions of the barrel by engagement with the latch;
• means permitting rotation of the barrel within said housing to a release position when the barrel is not in its locked position so that the latch no longer engages the detent means whereby the barrel can be pulled entirely out of the housing;
• a movable switch contact comprising a conductive annulus supported by said spring;
• a stationary switch contact comprising a small diameter conductive post;
• and means for supporting said post in said bore so that said post projects toward and is engaged by said annulus when the barrel is moved to its retracted position.

Vehicle security apparatus of the type including a tubular housing;

• a lock barrel having a rotary lock cylinder that controls a retractable latch, said barrel being slidably received in the housing bore and movable between an unlocked extended position and a locked retracted position within the bore;
• a spring positioned in the housing bore and which biases the barrel toward its extended position;
• detent means for establishing the extended and retracted positions of the barrel by engagement with the latch;
• means permitting rotation of the barrel within said housing to a release position when the barrel is not in its locked position so that the latch no longer engages the detent means whereby the barrel can be pulled entirely out of the housing;
• means in said bore defining a switch including a stationary switch contact and a movable switch contact movable into engagement with said stationary contact when said barrel is moved to its retracted position;
• alarm signal producing means connected electrically to said switch for producing an alarm signal in response to an intrusion noise, said alarm signal producing means comprising a transducer for producing an electrical signal in response to noise within a selected frequency band;
• means for amplifying said electrical signal to produce said alarm signal;
• and switching means responsive to said alarm signal for connection in a battery circuit, said switching means closing upon receipt of a said alarm signal to cause a voltage drop in the battery circuit that can be sensed by alarm means.

Vehicle security apparatus of the type including a tubular housing;

• a lock barrel having a rotary lock cylinder that controls a retractable latch, said barrel being slidably received in the housing bore and movable between an unlocked extended position and a locked retracted position within the bore;
• a spring positioned in the housing bore and which biases the barrel toward its extended position;
• detent means for establishing the extended and retracted positions of the barrel by engagement with the latch;
• means permitting rotation of the barrel within said housing to a release position when the barrel is not in its locked position so that the latch no longer engages the detent means whereby the barrel can be pulled entirely out of the housing;
• means in said bore defining a switch including a stationary switch contact and a movable switch contact movable into engagement with said stationary contact when said barrel is moved to its retracted position;
• alarm signal producing means connected electrically to said switch for producing an alarm signal in response to an intrusion noise, said alarm signal producing means comprising a transducer for producing an electrical signal in response to noise within a selected frequency band and means for amplifying said electrical signal to produce said alarm signal;
• means for producing an alarm disable signal;
• switch means switchable between at least first and second positions for applying either the alarm signal or the alarm disable signal to alarm circuit means;
• and first and second indicating means for indicating whether said switch means are in said first or second position.

Vehicle security apparatus comprising a transducer for producing an electrical signal in response to an intrusion noise within a selected frequency band;

• a switch having open and closed positions and means for locking the switch in its closed position;
• circuit means responsive to said electrical signal for producing and alarm disable signal for associated alarm means when said switch is in its closed position;
• first indicating means which are activated when said switch is in its closed position;
• second indicating means which are activated in response to said electrical signal;
• means for applying said electrical signal to activate said second indicating means when said switch is open;
• switching means connected to said circuit means and which, when closed, apply to the associated alarm means said alarm disable signal from said circuit means;
• and third indicating means for indicating when said switching means are closed.