Methods and apparatus for manufacturing piston rods
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 3, 1989
Grant Date -
N/A
app pub date -
Aug 14, 1987
filing date -
Aug 25, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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