Terminal for establishing a stable electrical connection to alum

Details Terminal for establishing a stable electrical connection to alum Terminal for establishing a stable electrical connection to alum

1974-03-15

1976-03-16

Lake, Roy

Geometrical instruments

339269, H01R 908

Patent

active

039443140

ABSTRACT:
This invention relates to a new and improved terminal for electrically connecting an aluminum wire to a wiring device which is stable and will prevent overheating during use.
The subject terminal comprises a terminal plate of conductive material having a serrated surface coated with indium which is held in engagement with a bare end of an aluminum wire under pressure. The serrated surface contains a multitude or closely spaced serrations having sharp edges and is plated with a thin layer of indium. The bare end of an aluminum wire is urged into engagement with the serrated surface of the terminal plate under pressure from a terminal screw or the like. The serrations mechanically anchor the wire against movement relative to the terminal plate and create breaks or asperities in an oxide film on the surface of the aluminum wire to establish contact sites between the wire and the terminal plate through which electric current can flow with low resistance. The indium coating on the terminal plate spreads over and protects the asperities in the wire against further oxidation to maintain the electrical characteristics of the connection and permit the flow electric current between the wire and the terminal plate without overheating during use.

REFERENCES:
patent: 3511921 (1970-05-01), Pasternak
patent: 3719919 (1973-03-01), Tibolla
patent: 3786398 (1974-01-01), Snider

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