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Vehicle theft-preventing device acting on the brake system

  • US 4,621,874 A
  • Filed: 10/16/1984
  • Issued: 11/11/1986
  • Est. Priority Date: 02/18/1983
  • Status: Expired due to Fees
First Claim
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1. A device for preventing the theft of vehicles and trailers, the deceleration brakes and parking brake of which are brakes operated with pressure medium, and which include at least two wheel pairs, a decelerating brake circuit, and a foot-operated decelerating brake valve, comprising a valve controlled by a code lock;

  • said valve being a three-way valve having one inlet port and two outlet ports;

    said valve being disposed in a feed line between a pressure medium source for actuating the parking brake and a control valve for the parking brake;

    said inlet port of said outlet ports being connected to said control valve, and the second one of said outlet ports being connected to the decelerating brake circuit for either one of the wheel pairs via a first check valve;

    a feed line from the foot-operated deceleration brake valve comprising a second check valve;

    by the locked position of a code lock, maintained in a first position, wherein the connection between said inlet port and said one of said outlet ports, is closed while maintaining the connection between said inlet port and said second one of said outlet ports open; and

    vice versa in a second, open position of said code lock, the line between said three-way valve and said first check valve being relieved of pressure when said code lock assumes said open position;

    said three-way valve including a pressure relief opening which is maintained in connection to said second outlet port of said valve body of said three-way valve when said valve body closes the connection with said inlet port and said second outlet port.

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