VEHICLE ANTI-THEFT SYSTEM COMBINATION

• US 3,735,834 A
• Filed: 12/27/1971
• Issued: 05/29/1973
• Est. Priority Date: 12/27/1971
• Status: Expired due to Term

• Current Assignee: St. Onge, Daniel A.
• Original Assignee: St. Onge, Daniel A.
• Inventors: St. Onge, Daniel A.
• Primary Examiner(s): Betts, Kenneth H.
• Assistant Examiner(s): McCormack, John
• Application Number:
  US05/212,366
• Time in Patent Office: 519 Days
• Field of Search: 180/82,103,111,112,113 192/3H 303/89,21CF 188/265
• US Class Current: 180/289
• CPC Class Codes: B60R 25/08 operating on brakes or brake systems

Abstract

An anti-theft system combination for vehicles, especially trucks and semi-trailers, which includes at least one double brake cylinder having a first compartment for applying the brakes with air-pressure for driving and a second compartment for automatically applying the brakes with spring force in the absence of air pressure when parked; the presence of air-pressure overcoming the spring force to give the first compartment control of brake application; at least one normally closed check valve in the air lines leading from air pressure supply, at least one normally open relief valve in the brake system down stream from said check valves; the check valve and the relief valve being solenoid actuated to their non-normal conditions; wires leading to the solenoid controlling the valves; a self-locking normally open relay in said wires; and a key operated mechanism for closing the relay; the anti-theft system having a driving condition upon connection of air pressure to the air lines and EMF to the wires established by the driver using the key to close the relay whereupon the check valves are open allowing introduction of air pressure into the brake system and the relief valve is closed holding air pressure in the brake system; the anti-theft system having a non-driving condition upon the disconnection of EMF to the relay whereupon it opens and stays open allowing the relief valve to open to vent air pressure in the brake system whereupon the spring force of the air cylinder sets the brakes under spring force preventing movement of the vehicle and the check valve closes preventing the introduction of air pressure to overcome the spring force to release the brakes.

Claims

1. An anti-theft combination for vehicles having an air-brake system including pressure supply lines wherein the brakes of the parked vehicle are applied with spring force to prevent movement of the vehicle, comprising, at least one double compartment brake cylinder having a first compartment for applying the brakes with air pressure for control while driving and a second compartment having a spring for automatically applying the brakes with spring force in the absence of air pressure for holding the vehicle when parked;

said second compartment having a diaphragm compressing said spring to a neutral position when air pressure is present in the brake system;

a normally closed check valve in the air lines leading from pressure supply to said brake cylinder for blocking air pressure supply when parked;

a normally open relief valve in said brake system down stream from said check valve for venting air pressure in the brake system when parked;

a solenoid on each said valve for moving each said valve to its non-normal position when said solenoids are energized;

wires leading to said solenoids for electrically energizing said solenoids;

a normally open relay in said wires normally interrupting EMF supply to said solenoids;

said relay being self-holding-in when closed and energized and opening automatically upon deenergizing;

a key operated lock mechanism for closing said relay, and a key for operating said lock mechanism;

the anti-theft system having a driving condition upon connection of air pressure to the air lines and EMF to the wires established by the driver using said key to close said relay whereupon said solenoids are energized and said check valves are open allowing introduction of air pressure into the brake system and said relief valve is closed holding air pressure in the brake system with said diaphragm compressing said spring to a neutral position;

the anti-theft system having a non-driving condition upon the disconnection of EMF to said relay whereupon it opens the stays open de-energizing said solenoids thereby allowing said check valve to close preventing the introduction of air pressure to said diaphragm to Release the brakes by compressing said spring to a neutral position, and allowing said relief valve to open to vent air pressure in the brake system including said diaphragm whereupon the spring force of said spring in said air cylinder sets the brakes preventing movement of the vehicle.

2. In a combination as set forth in claim 1, said vehicle having a door;

a spring pressed lock bolt normally locking said door when in closed position;

an air cylinder having a piston connected to said bolt; and

an air line leading to said air cylinder from said brake system;

presence of air pressure in said brake system moving said piston to withdraw said spring pressed lock bolt from its normal position to unlock said door;

absence of air pressure in said brake system allowing said spring pressed lock bolt to move to its normal position to lock said door.

3. In a combination as set forth in claim 1, said vehicle having a door;

a spring pressed lock bolt normally locking said door when in closed position;

a solenoid connected to said lock bolt, and a wire leading from said relay for energizing said solenoid;

closing said relay energizing said solenoid to withdraw said spring pressed lock bolt from its normal position to unlock said door;

opening said relay de-energizing said solenoid allowing said spring pressed lock bolt to move to its normal position to lock said door.