Extrusion puller jaws

Details Extrusion puller jaws Extrusion puller jaws

1990-03-30

1991-02-19

Larson, Lowell A.

Metal deforming

By extruding through orifice

With product handling

72422, B21C 3502

Patent

active

049932527

ABSTRACT:
An extrusion puller which comprises an upper jaw, a lower jaw, and means for mounting the upper and lower jaw relative to each other. The upper jaw comprises a plurality of jaw fingers with radially extending gripping teeth circumferentially spaced around the bottom portion of the tooth wherein the attack angle between teeth and the spacing angle between adjacent teeth is selected so that substantially full penetration of at least one of the gripping teeth into the workpiece is achieved without interference from an adjacent tooth. The lower jaw comprises a serrated upper surface comprising a semi-circular scalloped configuration of a plurality of peaks and valleys. The combination of the upper jaw and lower jaw configuration allows for increased gripping strength to be exerted on the workpiece and thereby avoid defects within the extruded workpiece.

REFERENCES:
patent: 3078984 (1963-02-01), Baker
patent: 3118539 (1964-01-01), Harwood
patent: 3230753 (1966-01-01), Walker
patent: 3587280 (1971-06-01), Engelhardt
patent: 3881339 (1975-05-01), Mannell
patent: 4307597 (1981-12-01), Elhaus
patent: 4522091 (1985-06-01), Toffolon
patent: 4566298 (1986-01-01), Elhaus
Smith Design, Exhibit A, prior to Mar. 30, 1990.

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