Overspeed safety means for fuel injection pumps of internal combustion engines

Claim 1

An overspeed safety apparatus for a fuel injection pump provided on an internal combustion engine, said injection pump having a work chamber and a suction chamber, said work chamber communicating with said suction chamber via an electrically activated valve, said electrically activated valve being operated by an electrical circuit and normally being held in an open position during operation of said engine, said pump further having means for ascertaining a threshold rpm for fuel shut-off and thereupon permanently interrupting the electrical circuit to close the electrically activated valve, characterized in that said means for ascertaining the threshold rpm comprises a centrifugal, electrical conductor, interruptor means provided with a flyweight, said flyweight pivoting counter to means providing a restoring force in proportion to increasing rpm in response to centrifugal force, said electrical circuit having an electrical conductor loop means positioned adjacent to said centrifugal, electrical conductor, interruptor means, said electrical conductor loop means being severed by said flyweight upon said centrifugal electrical conductor, interruptor means attaining the threshold rpm, thereby permanently interrupting said electrical circuit thereby closing said electrically activated valve to prevent fuel flow from the suction chamber to the work chamber whereby said electrical conductor loop means must be replaced in order to complete the electrical circuit to said electrically activated valve.