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Vehicle theft-prevention system

  • US 4,834,207 A
  • Filed: 10/06/1987
  • Issued: 05/30/1989
  • Est. Priority Date: 10/06/1987
  • Status: Expired due to Fees
First Claim
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1. A system for the prevention of theft of a motor vehicle having doors, an engine, a driver area, an ignition system and an hydraulic brake system including at least one master cylinder, at least one slave cylinder, and a network of hydraulic fluid-flow lines coupled to said brakes, said brake system being capable of locking the wheels of the vehicle in response to the application of pressure within said brake system and the maintenance of said pressure upon said slave cylinder, said theft prevention system comprising:

  • a valve system connected between said master cylinder and said slave cylinder of said vehicle, said valve system being selectively actuatable to allow passage of fluid only from said master cylinder to said slave cylinder for creating pressure and engaging said brakes and maintaining said pressure thereon;

    an electronic package connected to said valve system and said ignition system for generating an alarm signal for selectively actuating said valve system;

    a keyboard connected to said electronic package for controlling the operation thereof, including means for receiving multi-digit code in said keyboard to effect de-actuation of said valve system and the release of said brakes for the operation of said vehicle;

    said valve system including at least one one way valve and a remotely actuatable solenoid valve in parallel flow relationship therewith and coupled to said electronic package, said solenoid valve having a normally closed position when not remotely actuated by said electronic package for permitting closure once said ignition system of said vehicle is turned off therein allowing only one-way flow of said hydraulic fluid to said slave cylinder; and

    a manual fluid flow valve disposed in parallel flow communication with said solenoid valve for facilitating the select bypass thereof by manual operation and disabling said system.

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