Machine and method for repairing damaged grain aeration pipes

Details Machine and method for repairing damaged grain aeration pipes Machine and method for repairing damaged grain aeration pipes

1991-10-15

1993-03-16

Larson, Lowell A.

Metal deforming

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

During rotation of work

72106, B21D 302

Patent

active

051933764

ABSTRACT:
The method of straightening deformed hollow lightweight metal pipe by threading the deformed pipe over the uppermost of three rolls where the upper roll is positioned in overlapping condition with two horizontal lower rolls. The rolls are then moved so that they lightly engage the pipe. The lower rolls are rotated in one direction, and the upper roll in an opposite direction, whereupon deformations in the pipe are moved to the arc of the periphery of the tube defined generally by the two points of close positioning of the upper roll with each of the lower rolls. The machine for carrying out the method has a frame with the three horizontal rolls supported thereon. Hydraulic motors power each of the rolls. A movable end frame normally supports one end of the upper roll, but can be pivoted out of the way to permit the deformed pipe to be inserted on the upper roll. Circular or spiral rings are on the lower and/or upper rolls to accommodate corrugations in the deformed pipe.

REFERENCES:
patent: 455186 (1891-06-01), Elmore
patent: 1045161 (1912-11-01), Machlet
patent: 1209071 (1916-12-01), Taylor
patent: 1930562 (1933-10-01), Krueger
patent: 2550842 (1941-05-01), McClure
patent: 2649129 (1953-08-01), Schlank
patent: 3464253 (1969-09-01), Beyer

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