Electrical lead
AssigneeTherm-O-Disc, Incorporated
InventorDavid A. Hohider
Life of this patent
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Abstract
An elongated electrical lead has a first part of a hard and brittle arc quenching metal integrally joined to an easily bendable second part of a ductile metal. The lead is used in a thermal cutoff with the first part being inside of the thermal cutoff housing and having an end portion defining an electrical contact. The second part of the lead extends outwardly from the thermal cutoff for connecting same in an electrical circuit.
Claims9
An elongated electrical lead of first and second parts integrally joined together at a joint located intermediate the opposite ends of the lead, each of said first and second parts forming part of the overall longitudinal length of said lead, said second part having a length substantially greater than the length of said first part, said first part being of a hard and brittle arc quenching metal and said second part being of a ductile metal, said first part having an enlarged terminal end portion that terminates in a convexly rounded terminal end, and said joint defining an enlargement in said lead intermediate the opposite ends thereof.
A temperature responsive thermal cutoff including a tubular housing having a closed end and an opposite open end receiving a dielectric bushing having a hole therethrough, an elongated electrical lead having a first part of hard and brittle arc quenching metal integrally joined to a second part of ductile metal at a joint, said lead being received in said bushing hole and having an end portion that is formed by said first part and defines a fixed contact projecting externally of said bushing within said tubular housing, a movable contact within said housing normally engaging said fixed contact on said end portion of said first part, and a normally solid meltable dielectric thermal pellet in said housing that melts at a predetermined temperature for providing permanent separation of said contacts, said first part of hard and brittle arc quenching metal inhibiting arcing upon separation of said contacts to thereby inhibit welding together of said contacts.
Dependencies are inferred from the claim text.