Apparatus for forming circularly bent articles from a straight p

Details Apparatus for forming circularly bent articles from a straight p Apparatus for forming circularly bent articles from a straight p

1977-08-04

1979-03-06

Keenan, Michael J.

Metal deforming

By use of roller or roller-like tool-element

Comprising tool movable relative to stationary work-portion...

72386, 72297, 72 15, B21D 700

Patent

active

041423941

ABSTRACT:
Apparatus for forming circular rims for bicycle wheels from metal profiled strip material in which first strip pieces are cut to a length corresponding to the circumferential length of the rims, curved end portions are formed on each strip piece, and each strip piece is introduced into a three-roll ring rolling apparatus. After the strip piece has been worked up to the trailing curved end portion thereof, the adjustable middle roll of the rolling apparatus is shifted a small distance towards the two outer rolls into a position corresponding with a substantially bending-free passage of the trailing curved end portion of the strip piece.

REFERENCES:
patent: 2036745 (1936-04-01), Diehl
patent: 2178926 (1939-11-01), Brickman et al.
patent: 2288273 (1942-06-01), Enghauser
patent: 2922324 (1960-01-01), Honerkamp et al.
patent: 3466914 (1969-09-01), Gilchrist
patent: 3618353 (1971-11-01), Meyer

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