Helically wound mandrel assembly

Details Helically wound mandrel assembly Helically wound mandrel assembly

1975-01-17

1976-10-05

Larson, Lowell A.

Metal deforming

Process

72481, 85 64, 72479, B21D 3104

Patent

active

039837360

ABSTRACT:
A mandrel assembly for expanding holes through work pieces including a helically wound coil member with interconnected helical flights and a support member with the support member supporting the flights of the coil member so that the leadingmost flight has a first effective outside diameter smaller than the initial hole diameter and at least one of the flights trailing the leadingmost flight has a second effective outside diameter larger than the first outside diameter of the leadingmost flight. The support member may be a threaded fastener supporting the flights of the coil member by its threads or have a tapered support section to support the coil member. The method of using the mandrel assembly is contemplated.

REFERENCES:
patent: 2868056 (1959-01-01), Latorre
patent: 3316795 (1967-05-01), Tann
patent: 3515027 (1970-06-01), Textrom

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