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:
Oct. 03, 1989
Filed:
Aug. 14, 1987
Masaomi Suzuki, Tokyo, JP;
Hiroyasu Koizumi, Kanagawa, JP;
Nihon Radiator Co., Ltd., Tokyo, JP;
Abstract
A method for producing a piston rod for securing a ball to each end of a rod through projection welding which comprises detachably retaining the ball to be secured in a ball holder for presenting the proximate rod end to the ball; the ball holder being constructed of electrically conductive material to provide a first electrode, with the rod holder being constructed of electrically conductive metal to provide a second electrode. The ball holder and rod holder are adapted for relative travel toward each other to effect a mutual zone of ball and rod contact. Electric current is then passed through the first and second electrodes for projection welding of the ball and rod through the zone of contact while the same are in an inert gas atmosphere. Then the now welded contact is cooled; and thereafter a second electric current is passed therethrough to temper the weld. Apparatus useful for effecting such method is provided having suction means for retaining the ball during performance of the method; there being further provided a stopper element for limiting the relative travel of the ball holder and rod holder toward each other.