Electric heating – Metal heating – By arc
Patent
1994-10-14
1996-08-27
Paschall, Mark H.
Electric heating
Metal heating
By arc
21912144, 21912156, 21912154, 21912421, 21912434, B23K 1000
Patent
active
055503446
ABSTRACT:
An apparatus for mounting a cutting torch to a shape cutting machine is adapted to detect contact between the torch and a workpiece in the vertical direction, and between the torch and an obstruction in a lateral direction. The mounting apparatus includes a torch holding sleeve, a bearing assembly, a base ring, and a pressure release valve assembly. The bearing assembly includes an inner race portion of the sleeve, three bearing plates, three bearing pins, and an outer race which is mounted to the base ring by three compressed springs. When the torch contacts the workpiece, the base ring, the bearing plates and outer race of the bearing assembly displace linearly relative to the sleeve. An adjustment screw releases a ball stud which presses a ball against a ball seat in the valve assembly. With the ball unseated, pressurized gas is permitted to escape past the ball and to the atmosphere. A pressure differential switch senses the difference in pressure and signals the programmed control logic of the shape cutting machine to reverse the direction of the output drive which moves the torch. Similarly, when the torch contacts an obstruction, the bearing assembly rotates relative to the base ring and again displaces linearly relative to the sleeve. The mounting apparatus is also adapted to return the torch to the same operating position after the torch is removed, and the same vertical location and orientation after the torch contacts an obstruction in a lateral direction.
REFERENCES:
patent: 4284871 (1981-08-01), Mawson et al.
patent: 4415795 (1983-11-01), Ross et al.
patent: 4533078 (1985-08-01), Klien et al.
patent: 4547653 (1985-10-01), Franco-Ferreira et al.
patent: 4795882 (1989-01-01), Hardwick et al.
patent: 5160821 (1992-11-01), Oakley
Paschall Mark H.
The ESAB Group, Inc.
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