Expanding mandrel

Details Expanding mandrel Expanding mandrel

1988-04-20

1989-06-20

Watson, Robert C.

Work holders

Holder inserted within work aperture

Expandable mandrel

B21D 4102

Patent

active

048403601

ABSTRACT:
An expanding mandrel is disclosed for operation within a cylindrical sleeve, which may be rotated within the sleeve while engaging the workpiece. A three point contact is made within the inner diameter of the workpiece utilizing only a two piece device. A body member is provided having a working end which engages an inner diameter of a workpiece at a single point. A single wedge member which is generally elliptical in cross section slidably engages the body member. The wedge has a working end which engages the inner diameter of the workpiece at two points, the wedge being biased by a spring within the body member. In operation, the wedge and body member are forced against the inner diameter of the workpiece by the spring, and are released by the application of external pressure on an internal shaft to permit the application and removal of the mandrel from a workpiece.

REFERENCES:
patent: 670468 (1901-03-01), Collins
patent: 1683167 (1928-09-01), Cunningham
patent: 2790246 (1957-04-01), May
patent: 3117483 (1964-01-01), Brown
patent: 3833229 (1974-09-01), Hohwart et al.
patent: 3986383 (1976-10-01), Petteys
patent: 4464076 (1984-08-01), Leibhard

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