Method of extracting a bushing from a bore

Details Method of extracting a bushing from a bore Method of extracting a bushing from a bore

1993-06-29

1995-04-11

Kisliuk, Bruce M.

Metal working

Method of mechanical manufacture

Disassembling

29468, 29255, 29252, 29263, B23P 1900

Patent

active

054046319

ABSTRACT:
A bushing installed in a bore with an interference fit is extracted concentrically from the bore using an elongated mandrel which is maintained coaxially on the bore centerline by a guide inserted in one end of the bore while the bushing is extracted from the other end of the bore. The force to press the bushing out of the bore is exerted by a pulling tool to which the mandrel is coupled, and that force is transmitted through the mandrel to the bushing by way of a collar attached to the mandrel. The force of the pulling tool exerted on the mandrel is reacted through an anvil attached to the barrel of the pulling tool and in contact with a cup having a cylindrical sidewall surrounding the bushing to be extracted and in contact with the side of the part opposite from which the bushing is being extracted from the bore. The faces of the collar, the cup, and the anvil are machined flat and perpendicular to the axis of the mandrel so that the squeezing force exerted between them on the bushing and the part is parallel to the axis of the bore. This ensures that the bushing is pressed straight out of the bore and is held in a concentric orientation during the extraction so there is no gouging of the walls of the bore and the bushing is extracted exactly concentrically with the bore.

REFERENCES:
patent: 2596549 (1952-05-01), Hamilton
patent: 5056477 (1962-10-01), Wooley

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