Elongated tube expander tool

Metal deforming – By relatively receding work-engaging tool-faces – Embodying three or more tools

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Details

291574, 29523, 29727, 292835, B21D 4102

Patent

active

046946772

ABSTRACT:
An elongated tube expander tool and method for its use for remotely expanding a tube end to provide a close fit in an existing tube, such as before welding the tube end to the existing tube. The expander tool comprises an elongated central shaft attached to a cylinder which is attached to a collet having multiple expandable fingers. The cylinder contains a slidable front piston connected to a mandrel located within the collet, so that when the piston is pressurized and moved forward the multiple fingers are expanded radially outwardly within the tube end. In use, the tool is inserted into a replacement tube until a front shoulder of the tool housing contacts the replacement tube end portion to be expanded. The front piston is then pressurized and the mandrel forced axially forward through the collet so as to expand the collet fingers, which action expands the tube end firmly against the existing tube suitable for a weld to be reliably made between the closely fitting tubes. The rear piston is then pressurized and pulls the collet fingers free from the expanded joint, after which the tool is removed.

REFERENCES:
patent: 688429 (1901-12-01), Monroe
patent: 691446 (1902-01-01), Colby
patent: 1039948 (1912-10-01), Hunter
patent: 1049173 (1912-12-01), Turek
patent: 2319216 (1943-05-01), Dewald
patent: 3345730 (1967-10-01), Laverty
patent: 3583388 (1986-04-01), Hogenhout
patent: 3829948 (1974-08-01), Miller et al.

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