Antitheft ignition lock structure for car

• US 20070052526A1
• Filed: 08/23/2005
• Published: 03/08/2007
• Est. Priority Date: 08/23/2005
• Status: Abandoned Application

• Current Assignee: Ching Yuan Tsai
• Original Assignee: Ching Yuan Tsai
• Inventors: Tsai, Ching Yuan
• Application Number:
  US11/208,708
• Publication Number:
  US 20070052526A1
• Time in Patent Office: Days
• US Class Current: 340/426.300
• CPC Class Codes: B60R 25/04 operating on the propulsion system, e.g. engine or drive motor
• 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: B60R 25/1004 Alarm systems characterised by the type of sensor, e.g. current sensing means using door lock sensors B60R25/1001

Abstract

An antitheft ignition lock structure for car includes two timing circuits, a monostable circuit, a non-stable circuit, an analog switch, and an RS flip-flop. The first timing circuit causes the monostable circuit to drive a relay for connecting to a voltage. The flip-flop is triggered through turning on and off the ignition lock. When the ignition lock is not turned off within a predetermined time after it is first turned on and then turned on for a second time, the engine of the car could not be started and the horn of the car would sound continuously as a warning to protect the car against theft.

Claims

1. An antitheft ignition lock structure for car, comprising:

a first timing circuit connected to an ignition lock of a car, an output of said first timing circuit being connected to a reverse buffer circuit and a monostable circuit, said monostable circuit being connected to a driving circuit that is further connected to a first relay, and said first relay being connected at a normal opened contact to a positive voltage and other circuits at a rear part of said antitheft structure, such that said first relay is enabled for a predetermined time when the ignition lock is turned on for the first time;

a buffer driving circuit connected at an input to the ignition lock, and at an output to an analog switch, said analog switch being connected at a trigger end to a contact on said first relay;

an RS flip-flop connected at a trigger end to a contact on said analog switch, and at an output to a second relay; and

said second relay being connected at a normal opened contact to an engine coil of the car; and

a second timing circuit connected a gate circuit, said gate circuit being connected to a non-stable circuit, which is connected to a third relay; and

said third relay being connected at a normal opened contact to a horn of the car;

whereby the engine of the car can be started only when said ignition lock is turned off within a predetermined time after it is first turned on, and then turned on for a second time; and

the engine could not be started and the horn is driven to sound continuously as an antitheft warning when said ignition lock is not turned off within said predetermined time after being turned on for the first time.