F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
121/62
F15B 13/00 (2006.01) B23K 11/31 (2006.01) F15B 11/028 (2006.01)
Patent
CA 2038297
ABSTRACT OF THE DISCLOSURE A multi-pressure control system for a backup type welding gun and similar apparatuses including a positioning directional control valve for controlling the extension and retraction of the positioning or backup cylinder. A multi- pressure air sequence circuit and a time delay means operatively connected to the air sequence circuit for controlling the admission of a predetermined low pressure into the retract port of a backup type welding gun positioning cylinder to speed up the extension movement of the position piston carrying a weld cylinder, and thence to control the admission of a predetermined higher retraction pressure higher retraction into said retract port, after a predetermined time delay interval. A welding pressure four- way directional control valve operatively connects a multi- pressure selector air circuit to the weld cylinder operating port to provide a plurality of pre-set pressures to the weld cylinder operating port for carrying out welding operations at selective pressures and in selected sequences.
Neff Robert H.
Voelker Tood C.
Borden Ladner Gervais Llp
Mac Valves Inc.
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