Pipe joints or couplings – For plural component line – Metal and elastomeric layers
Patent
1975-03-13
1976-07-06
Moon, Charlie T.
Pipe joints or couplings
For plural component line
Metal and elastomeric layers
29458, 29523, 2853824, 403404, 285405, F16L 4100
Patent
active
039678407
ABSTRACT:
The invention is concerned with an improvement in a process for forming a tubing-machined metallic member joint and with said joint, the process comprising providing a metallic member of substantially full theoretical density having a portion thereof adapted to matingly receive a metallic tube, placing one end of said tube against the mating portion of said member, said tube being formulated of a less hard metal than said member, and urging said one end of said tube against said mating portion of said member thereby forming said joint. The improvement comprises an increase in the torque strength of said joint attained by contacting said member, prior to the placing the one end of said tube in mating contact with the mating portion of said member, with steam at a temperature and for a time sufficient to form a thin hard metal oxide on said mating portion and cooling the member after completion of the contacting and prior to placing said tube in mating contact with said mating portion. The resulting tubing-member joint has a far greater resistance to torque than do the tubing-member joints of the prior art.
REFERENCES:
patent: 1348667 (1920-08-01), Snyder
patent: 1988418 (1935-01-01), German
patent: 2329653 (1943-09-01), Rogoff
patent: 2685461 (1954-08-01), Mueller
patent: 3188733 (1965-06-01), Rickard
patent: R21903 (1941-09-01), Brenneisen
Caterpillar Tractor Co.
Moon Charlie T.
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