Metal working – Method of mechanical manufacture – Repairing
Patent
1985-08-05
1986-08-05
Golderg, Howard N.
Metal working
Method of mechanical manufacture
Repairing
2940218, 29557, 30 96, 4082035, B23P 600, B23P 604
Patent
active
046034633
ABSTRACT:
A method and apparatus for the in situ repair of a failed compression fitg is provided. Initially, a portion of a guide tube is inserted coaxially in the bore of the compression fitting and locked therein. A close fit dethreading device is then coaxially mounted on the guide tube to cut the threads from the fitting. Thereafter, the dethreading device and guide tube are removed and a new fitting is inserted onto the dethreaded fitting with the body of the new fitting overlaying the dethreaded portion. Finally, the main body of the new fitting is welded to the main body of the old fitting whereby a new threaded portion of the replacement fitting is precisely coaxial with the old threaded portion. If needed, a bushing is located on the dethreaded portion which is sized to fit snugly between the dethreaded portion and the new fitting. Preferably, the dethreading device includes a cutting tool which is moved incrementally in a radial direction whereby the threads are cut from the threaded portion of the failed fitting in increments.
REFERENCES:
patent: 1255304 (1918-02-01), Gairing
patent: 2477482 (1949-07-01), Florin
patent: 3568721 (1971-03-01), Ross et al.
patent: 3944379 (1976-03-01), Elrod
patent: 3966349 (1976-06-01), Osman et al.
patent: 4459881 (1984-07-01), Hughes, Jr.
Jandrasits Walter G.
Wolbert Ronald R.
Constant Richard E.
Golabi I.
Golderg Howard N.
Hightower Judson R.
The United States of America as represented by the Department of
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