Abstract: An anti-hijacking and theft prevention device for motor vehicles having a fuel restricting solenoid valve assembly including an interchangeable solenoid operated fuel restricting valve and a circuit for operating the system. The solenoid operated fuel restricting valve is installed in the vehicle's fuel line. When the ignition key is inserted into the ignition switch of a vehicle and turned to the "on" position and the engine is started, a timer will start to count down from a predetermined period of time. If the system is not disabled by activating a hidden switch during the count down period, the solenoid operated fuel restricting valve moves from an open position to a closed position. The solenoid valve has a small valve orifice which allows only a small restricted amount of fuel to flow through the valve assembly in the fuel line. While the amount of fuel is sufficient to keep the engine from stalling, the vehicle will be capable of a speed of no more than 5 to 10 miles per hour.

Abstract: A spring loaded door hinge comprising a rod that moves with the door as the door pivots. Attached to the door frame is a flange. The door is attached to the rod by means of collars. The tails of the coil springs extend from the rod so that they may, depending upon their position, be in position to strike the door frame flange thereby preventing a large shock from being transferred to the door if it is swung open violently. Also the spring hinge allows the door to be easily opened initially with resistance to the door opening being controlled by the positioning of the tails of the coil springs. The springs are distributed vertically to prevent twisting of the door and frame. The tails of the spring coils are hooked so that the can engage the door frame flange if extreme force is placed upon the door when opening. The hooks set a limit as to how far the door may be opened and prevent the spring tail from binding between the flange and the spring coil.