Electricity: conductors and insulators – Conduits – cables or conductors – Combined
Patent
1970-12-03
1976-05-04
Broome, Harold
Electricity: conductors and insulators
Conduits, cables or conductors
Combined
29628, 174 90, 339 95R, 339223R, 339276T, H02G 1508
Patent
active
039550443
ABSTRACT:
A crimped corrosion proof terminal for crimping onto solid or stranded aluminum wire is disclosed. The precrimped combination includes a tubular, plated copper terminal, the forward portion of which is flattened and closed and the rearward portion houses a perforated insert. The rearward portion of the terminal carries an insulation sleeve disposed on a metallic ferrule. The rearward portion of the ferrule houses a bushing. This assembly is crimped such that the resulting crimped terminal and wire are progressively reduced in diameter in a stepwise fashion, a forward deeply crimped portion elongates and is provided with a reservoir which substantially fills with extruded wire.
The forward portion of the termination incurs the greatest reduction and the rearward portion the least. The crimping causes the aluminum wire to extrude through the perforations in the insert, thereby establishing good electrical contact between the wire and the terminal by breaking the aluminum oxide film on the aluminum wire. Longitudinal stress is developed at the interface of the extruded aluminum and the walls of the perforations which substantially prohibits longitudinal creep of the aluminum. The crimping also causes stranded aluminum wire to cold weld creating interstrand contact at the forward portion of the terminal where the greatest reduction in diameter takes place.
The crimped termination is closed in the forward portion and sealed in the rearward portion by the bushing to provide protection from harsh environments by eliminating electrolytic corrosion.
REFERENCES:
patent: 2109837 (1938-03-01), Davis
patent: 2251189 (1941-07-01), Jensen
patent: 2327650 (1943-08-01), Klein
patent: 2533200 (1950-12-01), Rogoff
patent: 2681439 (1954-06-01), Carlson
patent: 2692422 (1954-10-01), Pierce
patent: 2806215 (1957-09-01), Redslob
patent: 2810897 (1957-10-01), Shinske
Aluminum Joining Processes for the Electrical Industry, "Compression Connectors," Ref. Code: C, p. 8, Copyright 1968, by Aluminum Company of America, Pittsburgh, Pa. 15219.
Hoffman Ronald Clarence
Lemke Timothy Allen
Swengel, Sr. Robert Charles
AMP Incorporated
Broome Harold
Kita Gerald K.
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