Method and devices for the extraction of a closure plug from a s

Details Method and devices for the extraction of a closure plug from a s Method and devices for the extraction of a closure plug from a s

1990-04-03

1992-02-04

Evans, Geoffrey S.

Electric heating

Metal heating

Cutting or disintegrating

219 692, B23H 100, B23H 726, B23H 900

Patent

active

050862014

ABSTRACT:
The body (4) of the plug (3) is rebored in the direction of its end wall (6) and the clamp block (7) is drilled by an electric machining process, over a substantial part of the length of the plug. The wall of the plug body (4) is relieved of stress with the aid of a welding torch introduced into the bore made by electric machining, and a gripping tool is introduced into the bore in order to extract from the tube the plug body (4) which has been relieved of stress.

REFERENCES:
patent: 2942092 (1960-06-01), Cammann
patent: 4366617 (1983-01-01), Nanstiel et al.
patent: 4476368 (1984-10-01), Cammann et al.
patent: 4555833 (1985-12-01), Hawkins et al.
patent: 4694677 (1987-09-01), Rabe
patent: 4696102 (1987-09-01), Overbay
patent: 4734972 (1988-04-01), Hawkins
patent: 4793056 (1988-12-01), Kurokawa et al.
patent: 4800637 (1989-01-01), Overbay
patent: 4804814 (1989-02-01), Southerland et al.
patent: 4829660 (1989-05-01), Everett et al.
patent: 4903392 (1990-02-01), Stickel et al.
patent: 4916282 (1990-04-01), Chamming et al.
patent: 4948933 (1990-08-01), Thompson

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