Anti-theft or use device for self propelled or stationary engines

Claim 2

A fuel cutoff device comprising a plurality of serially connected valves including at least one normally closed valve, and at least one normally open valve, each of said at least one normally closed valve and each of said at least one normally open valve having menns to operate said valve including a solenoid coil mounted on said valve to move said valve from its normal position; a switching means operated from a control panel and connected electrically to said solenoid, a voltage divider in series with said switching means, a control rectifier with a gate electrode connected to an intermediate point on said voltage divider and its anode connected to said solenoid; power supply means connected to the anode of said control rectifier through said switching means; and ignition switch means connected to said power supply means in series with each of said switching means.

Claim 3

The fuel cutoff device of claim 1, further characterized by there being at least two normally closed valves, and at least one diode having its cathode connected to said anode of said control rectifier of one of said operating means of said normally closed valves and its anode connected to another intermediate point on said voltage divider of another one of said operating means of another of said normally closed valves whereby a sequence of operation is determined.

Claim 4

The fuel cutoff device of claim 1, further characterized by a holding switch means to retain switching means settings when said ignition switch means is shut off, said holding switch means connected to said power supply means in parallel with said ignition switch means.

Claim 5

A full cutoff device comprising a plurality of serially connected valves including at least one normally closed valve, and at least one normally open valve, both said normally closed valve and said normally open valve presenting similar outer appearances, each of said at least one normally closed valve and each of said at least one normally open valve having means to operate each said valve including solenoid means positioned to move each of said valves individually from its normal position, a switching means operated from a control panel and connected to said solenoid means, said plurality of valves having a continuous open passage through all of said plurality of valves upon operation of said switching means to operate said solenoid means only to each of said at least one normally closed valve, power supply means and ignition switch means connected in series with each of said switching means.

Claim 6

A full cutoff device comprising a plurality of serially connected valves including at least one normally closed valve, and at least one normally open valve, both said normally closed valve and said normally open valve presenting similar outer appearances, each of said at least one normally closed valve and each of said at least one normally open valve having means to operate each said valve including solenoid means positioned to move each of said valves individually from its normal position, a switching means operated from a control panel and connected to said solenoid means, said plurality of valves having a continuous open passage through all of said plurality of valves upon operation of said switching means to operate said solenoid means only to each of said at least one normally closed valve, power supply means and ignition switch means connected in series with each of said switching means.

Claim 7

The fuel cutoff device of claim 4, further characterized by each of said valves having a similar shaped valve body, said valve body having an upper chamber and a lower chamber connected to each other, a downward sloping passageway connecting to said lower chamber from one side of said valve body, an upward sloping passageway connecting to said upper chamber from the other side of said valve body, said passageways having openings to the opposite sides of said valve body on the same center line through said body.

Claim 8

The fuel cutoff device of claim 5, further characterized by a valve head positioned in said upper chamber of said normally open valve, and a valve head positioned in said lower chamber of said normally open valve.