Vehicle theft detector for detecting the pulling out of a lock

• US 4,737,762 A
• Filed: 10/04/1985
• Issued: 04/12/1988
• Est. Priority Date: 12/20/1984
• Status: Expired due to Fees

• Current Assignee: Toyota Jidosha Kabushiki Kaisha 1 Toyota-Cho Toyota-Shi Aichi-Ken Japan
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Ohnishi, Kenichi
• Primary Examiner(s): Crosland, Donnie L.
• Assistant Examiner(s): Swarthout, Brent A.
• Application Number:
  US06/784,314
• Time in Patent Office: 921 Days
• Field of Search: 340/63, 340/64, 340/541-543, 307/10 AT, 180/173, 180/287, 200/61.64, 200/61.66, 200/61.93, 200/DIG. 26, 200/43.01, 200/43.11, 70/1.5, 70/262, 70/237-239, 70/416, 70/422
• US Class Current: 340/426.28
• CPC Class Codes: B60R 25/1001 Alarm systems associated with another car fitting or mechanism, e.g. door lock or knob, pedals features related to the general power supply B60R25/1018
• CPC Class Codes: E05B 45/06 Electric alarm locks E05B45/005 takes precedence
• CPC Class Codes: Y10T 70/20 Attack-actuated defeating mechanisms

Abstract

A vehicle theft detector apparatus includes a key cylinder attached to a door or an opening/closing part, this cylinder having a built-in key switch which sends locked and unlocked signals to an alarm device and a locking device, the lead wires from this lock switch leading to the alarm device and locking device via connectors. When the key cylinder is removed for the purpose of entering the vehicle, the lead wires attached to the cylinder are pulled out from the connector and then the thief enters the vehicle, the alarm is sounded and the thief detected. The above-mentioned detector apparatus is provided with apparatus for taking up the slack in the lead wires, thus ensuring that the connector is immediately disconnected no matter how slightly the cylinder is pulled outwards.

Claims

1. A vehicle theft detector for detecting the pulling out of a lock comprising:

locking means for locking and unlocking an opening/closing part of a vehicle;

a cylinder with a built-in key-operated unlock switch which outputs locked and unlocked signals to said locking means to lock and unlock the part;

an alarm device which is capable of being activated or deactivated responsive to the lock and unlock signals from said unlock switch respectively; and

connecting means for transmitting said lock and unlock signals from said unlock switch to said alarm device and to said locking means;

including

a first connector connected to said unlock switch through lead wires,

a second connector, which couples with said first connector, is fixed to the inside of the part and leads to said alarm device and to said locking means, wherein said alarm device is activated when a lock signal is output to said alarm device and said first and second connectors are uncoupled from each other, so that the lock signal transmitted from said unlock switch to said alarm device is interrupted.

2. A vehicle theft detector according to claim 1, wherein on installation of said detector there is slack in the lead wires and further comprising:

means for taking up the slack in said lead wires.

3. A vehicle theft detector according to claim 2, wherein said means for taking up the slack comprises an upper clamp fixed to the wires near the cylinder, a band-like member fixed to said upper clamp, said member meshing with a ratchet member on a lower clamp fixed to the lead wires near the first connector.

4. A vehicle theft detector according to claim 3, wherein said member has a side with saw-teeth and said ratchet member on the lower clamp is provided with teeth that hold said saw-teeth side of said band-like member.