The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 06, 1976
Filed:
Mar. 13, 1975
Robert A McFall, East Peoria, IL (US);
Caterpillar Tractor Co., Peoria, IL (US);
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.