Spot welding machine

Details Spot welding machine Spot welding machine

1997-07-16

1998-11-03

Mills, Gregory L.

Electric heating

Metal heating

For bonding with pressure

219 89, B23K 1110

Patent

active

058312340

ABSTRACT:
In opposition to a lower electrode (31) fixed to a frame (3), an upper electrode (29) is carried by an upper pressing base (23), which is engaged with a vertical guide rail (25) and joined by a resilient slide mechanism to a piston rod (35L) of a hydraulic cylinder (35) connected to a hydraulic circuit operable for an increased distance (L3) between electrode shanks (15, 7) and fastened at a head end thereof to a lower pressing base (33), which is engaged with the guide rail and joined to a piston rod (37L) of an air cylinder (37) fastened at a head end thereof to the frame and connected to a pneumatic circuit operable for supplying a balancing pressure to have the piston rod (37L) thereof contracted to stand with a total load and for relieving the pressure when a mechanical valve (85) is operated with a pedal arm (49) stepped down for starting a welding, while the pneumatic circuit is changed over by a limit switch (57) to force down the lower pressing base.

REFERENCES:
patent: 1315876 (1919-09-01), Southall
patent: 2283826 (1942-05-01), Soehner
patent: 2293393 (1942-08-01), Humphrey
patent: 2476187 (1949-07-01), Gordon
patent: 2712585 (1955-07-01), Domeny
patent: 2793283 (1957-05-01), Wellman
patent: 2859330 (1958-11-01), White
patent: 3889094 (1975-06-01), Needham

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