Apparatus for flattening irregular circumferential surfaces in s

Details Apparatus for flattening irregular circumferential surfaces in s Apparatus for flattening irregular circumferential surfaces in s

1990-05-24

1991-06-04

Larson, Lowell A.

Metal deforming

By use of tool acting during relative rotation between tool...

With cutting of work or product

72 49, 72 96, B21C 3712

Patent

active

050203517

ABSTRACT:
An apparatus for flattening irregular circumferential surfaces in spirally formed pipe and for cutting such pipes is disclosed. The apparatus includes a pipe surface flattening assembly and a rotating knife assembly. The pipe surface flattening assembly includes an upper roller and a lower roller which are brought into flattening contact with the surface of the pipe in the area to be cut. The rollers move axially with the pipe and cooperate with an inner roller located inside the pipe to flatten any raised surface irregularities on the inside and outside surface of the pipe as the pipe rotates between the rollers. The rotating knife assembly includes an inner knife located inside the pipe and an outer wire positioned outside the pipe. A rotatable support roller is positioned outside the pipe, and opposite the outer knife. To cut the pipe, the outer knife punctures the pipe in the area previously flattened. The outer knife overlaps the inner knife and the support roller abuts the opposite side of the pipe. The inner and outer knives and the support roller move axially with the pipe. As the pipe continues to rotate, it is completely severed.

REFERENCES:
patent: 3093103 (1963-06-01), Berkeley
patent: 3268137 (1966-08-01), Martin
patent: 3662579 (1972-05-01), Lewis
patent: 4018072 (1977-04-01), Davis
patent: 4041747 (1977-08-01), Elkin
patent: 4091648 (1978-05-01), McCaslin
patent: 4711110 (1987-12-01), Castricum
patent: 4924684 (1990-05-01), Castricum

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