Mechanical tube expander

Details Mechanical tube expander Mechanical tube expander

1976-11-15

1978-01-03

Larson, Lowell A.

Metal deforming

By relatively receding work-engaging tool-faces

Embodying three or more tools

269 481, B21D 3104

Patent

active

040659534

ABSTRACT:
A mechanical pipe expander for a step-by-step expanding of steel pipes formed with a spiral welded seam. The expander includes an expander head that performs the expanding made up of circumferentially arranged segments over which the pipe assumes a circumjacent position and after which the segments move radially outward to forcibly engage the inside of the pipe. In order to avoid the segments contacting the inside welded seams of the pipe, the segments are formed with one or more complementary spiral slots and if the pipe has cross welded seams with one or more corresponding cross spiral slots.

REFERENCES:
patent: 1719720 (1929-07-01), Olsen
patent: 3981172 (1976-09-01), Hess et al.

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