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:
Mar. 28, 1978
Filed:
Feb. 04, 1977
Wallace C Rudd, New Canaan, CT (US);
Humfrey N Udall, Darien, CT (US);
Thermatool Corporation, Stamford, CT (US);
Abstract
In-line electrical welding apparatus for welding small diameter, thin-walled, metal tubing as it is advanced longitudinally comprising a high frequency electrical current source, a pair of upstream electrical contacts connected to one terminal of the source and a pair of downstream electrical contacts connected to the other terminal of the source through a proximity conductor which extends in close relation to the edges of the tubing to be heated from the downstream contacts to adjacent the upstream contacts. The contacts are each independently movable toward and away from the tubing along paths parallel to planes parallel to and intersecting the tubing axis and at an acute angle to each other. Guiding means adjacent to the downstream contacts apply welding pressure to the tubing, and further guiding means upstream of the downstream contacts but at least as close to the weld point as the upstream contacts guide the tubing as it is advanced. Both guiding means have surfaces which engage the tubing and which cause the tubing to maintain a non-circular cross-section as it is advanced from the upstream contacts to the weld point.