Engine disabling overheat protector

Claim 1

A SELF-CONTAINED ENGINE OVERHEAT PROTECTOR ATTACHABLE INDIVIDUALLY TO SPARK PLUGS OF AN INTERNAL COMBUSTION ENGINE AND ADAPTED TO AUTOMATICALLY SHORT-CIRCUIT THE SPARK PLUGS AND CAUSE THEM TO CREASE FIRING AFTER THE PLUG SHELLS REACH A TEMPERATURE WHICH IS A SELECTED NUMBER OF DEGREES ABOVE THEIR RESPECTIVE NORMAL OPERATING TEMPERATURES, SAID PROTECTOR COMPRISING: AN ELONGATED ELECTRICALLY CONDUCTIVE SPRING MEMBER HAVING AN INTEGRAL TERMINAL AT ITS OUTER END FOR SECURING THE MEMBER TO THE CENTRAL ELECTRODE TERMINAL OF A SPARK PLUG, WITH THE INTERMEDIATE PORTION OF THE MEMBER EXTENDING ALONGSIDE THE INSULATED PORTION OF THE PLUG, AND WITH THE INNER END OF THE SPRING MEMBER ADJACENT AND URGED TOWARD A PORTION OF THE SHEELL OF THE PLUG, WHICH CARRIES THE GROUND ELECTRODE; AND A FUSIBLE INSULATOR INTERPOSED BETWEEN THE INNER END OF THE SPRING MEMBER AND THE ADJACENT PORTION OF THE SPARK PLUG SHELL TO PREVENT THE PASSAGE OF ELECTRIC CURRENT FROM ONE TO THE OTHER DURING OPERATION OF THE ENGINE AT NORMAL TEMPERATURE; SAID INSULATOR BEING MADE OF A MATERIAL HAVING A MELTING TEMPERATURE WHICH IS A SELECTED NUMBER OF DEGREES ABOVE THE TEMPERATURE OF THE SPARK PLUG SHELL WHEN THE ENGINE IS OPERATING AT NORMAL TEMPERATURE, WHEREBY IF THE ENGINE OVERHEATS, CONDUCTION CAUSES THE SPARK PLUG SHELL TEMPERATURE TO RISE TO THE MELTING POINT OF THE INSULATOR, THE INSULATOR MELTS, THE INNER END OF THE SPRING MEMBER IS SPRING PRESSED INTO ELECTRICAL CONTACT WITH THE ADJACENT PORTION OF THE SPARK PLUG SHELL, AND THE SPARK PLUG IS SHORT-CIRCUITED.