Abstract: A disengagable locking arrangement for holding an inductor assembly for heating a valve seat, which assembly is reciprocally movable along a path through a support structure. The support structure includes a "P" shaped clamp disposed within a cavity in the support structure. The clamp has arcuate arm portions substantially surrounding the movable inductor assembly with surfaces for frictional engagement therewith. The clamp also has base arm portions laterally offset from the movable assembly through which a spindle generally transverse to the path of the member extends. A mechanism associated with the spindle is provided for drawing the arcuate arm portions toward each other when the spindle is rotated about its axis in a predetermined direction to effect locking engagement between the clamp and the assembly.

Abstract: A method of hardening the radially, outwardly facing surfaces of a generally circular, toothed workpiece adapted to rotate about a central axis generally concentric with the outwardly facing surfaces whereby the extremities of the surfaces define an outer circle by the tips of the teeth of the workpiece. This type of workpiece is generally a gear.

Abstract: A method and apparatus for the heat treating of quench hardenable ferrous alloy workpieces utilizing periodic eddy current excitation and reflection to determine the in-line cooling rate from the critical temperature of the workpiece material and comparing the in-line cooling rate against a standard rate for establishing acceptance or rejection of the quenched workpiece.

Abstract: An inductor for inductively heating the valve seat of an engine component includes non-magnetic spacer pads on the inductor coil which engage the valve seat surface to establish the inductive coupling gap, and a centering nose which enters the valve stem bore and coacts with a universal coupling between the inductor and the inductor frame to provide concentricity between the valve seat and the core and to accommodate angular variations between the valve seat and the inductor frame.

Abstract: An induction heating apparatus for inductively heating the valve seats of a family of engine component designs includes a plurality of rotatably mounted inductors which are selectively indexed and cycled in accordance with the component design presented at the heat treating station.

Abstract: An induction hardened valve seat insert is provided with a ridged outer surface which establishes a mechanically locked engagement with the wall of the insert bore during the induction heating cycle.

Abstract: A power inverter particularly suited for use in applications requiring serially inductively heating workpieces in a predetermined manner, having a main inverter and an auxiliary starting inverter, in an arrangement in which the starting inverter is selectively applied and removed from the load in predetermined timed relationship with the application of the main inverter across the load, and providing a decrease in the inherent instability of the main inverter operation through an increase in the apparent Q of the load, while adjusting the output of the starting inverter to a value greater than the instability level of the main inverter.

Abstract: Ferrous parts are heat treated by preheating the part to an elevated temperature, inductively heating the preheated part to an austenitizing temperature followed by quenching and isothermal transformation in a media maintained at a predetermined isothermal transformation temperature.

Abstract: An induction heating device is provided which can be easily and inexpensively modified to inductively heat and quench harden workpiece bores of various diameters. The device consists of a permanently mounted mandrel and easily interchangeable inductor coil and quench modules which can be easily and rigidly connected to the mandrel.

Abstract: A camshaft heat treating apparatus for processing a plurality of camshaft designs, which camshaft identifies and thereafter automatically inductively heats, quenches and inspects the camshaft in accordance with its design parameters.

Abstract: A method and apparatus for heat treating camshafts includes a retractable shield positioned between a previously hardened surface and a surface being heat treated. During the induction heating and quenching cycle, a coolant is delivered to the hardened surface to maintain the temperature thereof below the tempering temperature. The shield prevents the coolant from contacting the unhardened surface and interfering with the heating and quenching thereof.

Abstract: Thin walled broached parts are heat treated from manufactured dimensions to predetermined dimensions through control of heating, cooling and pressurization parameters during the heat treating cycle.

Abstract: A single loop inductor for inductively heating elongated workpieces is provided with flux concentrator assemblies accurately located on the parallel conductors by lamination keepers retained in keyways in the conductor.

Abstract: A single loop inductor for inductively heating elongated work pieces is machined including cooling passages for a single piece of electrically conductive material without fabricated joints between the conductor sections.

Abstract: A method and apparatus for inductively heating valve seats wherein an inductor is driven to a predetermined magnetic coupling with the valve seat under the control a range detecting transceiver unit.