GB1089176A - Improvements in spot welding guns - Google Patents

Abstract

1,089,176. Welding by pressure. MIDDLETON SHEET METAL CO. Ltd. March 4, 1966 [March 8, 1965], No. 9679/65. Heading B3R. A spot welder has two relatively movable portions each carrying an electrode with a handle pivoted on one portion and connected to the other portion to move the portions together or apart to bring one electrode into engagement with or withdraw the electrode from a component to be welded, supported by one bus-bar and to bring the other electrode into engagement with or withdraw it from another bus-bar. An upper portion A carries an electrode a at its upper end and carries at its lower end a cylindrical member a<SP>2</SP> extending into the upper end of a lower portion A<SP>1</SP>, a lower electrode a<SP>3</SP> being carried on a screw D for adjustment in a rubber bush d<SP>1</SP> in the lower end of the lower portion A<SP>1</SP>. Laminated strips d connect the two electrodes and a handle B pivoted to the upper portion A has an arcuate slot b engaging a pin b<SP>1</SP> on the lower portion A<SP>1</SP>. The welder is arranged between a lower bus-bar C, a pin a<SP>4</SP> on the lower electrode engaging one of a number of locating recesses c in the bus-bar, and the upper electrode a engages the work 1 through a hole in the plate C<SP>2</SP>, a further bus-bar C<SP>1</SP> engaging the work. In a modification the lower electrode is carried adjustably on a lower bar and the upper electrode is carried on an upper bar carrying downwardly extending pillars engaging guide cylinders upstanding from the lower bar. The upper bar is connected to a bracket having a lug through which slides a spindle extending from the adjusting screw and a handle is pivoted to the bracket and to a lever pivoted to the upper end of the spindle.