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.

Abstract: A plasma arc cutting torch is disclosed which includes a nozzle assembly below the electrode for injection of water around the plasma flow so as to constrict the arc. The nozzle assembly includes upper and lower disc like nozzle members which are spaced apart to define a water gap therebetween, and the members include aligned bores for permitting the plasma to flow therethrough to the underlying workpiece. The lower nozzle member is of extended length, and its forward or lower end portion is beveled to define a frusto-conical exterior surface, so as to permit the torch to be positioned closely adjacent the workpiece when making beveled cuts and so as to achieve the predetermined standoff which maximizes the quality and speed of the cut.