Abstract: A method of induction heat treatment of articles having curved outer surfaces, such as differential housings. The method employs a semi-rectangular induction coil that is adapted to provide a plurality of lateral magnetic fields that are used to induce currents in, and thereby provide heat to, a portion of the curved section of the article. The method and induction coil are particularly adapted to provide an induction hardening heat treatment of a curved heat treatment portion of a differential housing. The differential housing was cast from nodular iron. The induction-hardening heat treatment comprised heating the heat treatment portion of the differential housing above the austenite transition temperature and quenching to below the martensite transformation temperature.

Abstract: A telescoping device uses pins resting in grooves to serve as stop means for telescoping tubes. Each of a set of telescoping tubes has at least one groove running longitudinally along the outer tube circumference. A set of two right angled pins rests in a groove, the first pin extending outward through an aperture in the next largest tube's wall, the second pin extending inwardly through a groove aperture to serve as a stop for the next smallest tube. When the tubes are collapsed inwardly, the progress of each tube is stopped by the second pin in the next largest tube. When the tubes are extended outwardly, the progress of each tube is stopped by the abutting of the first and second pins' ends in a groove.

Abstract: The subject invention involves a device for sensing the depth to which a worn railroad wheel must be machined in order to reclaim the wheel tread and flange contour. The device consists of an assembly of gaging elements mounted on a support block which is, in turn, mounted on a guide rail for radial movement into contact with the wheel tread. The gaging elements include a flange edge contactor slidably mounted on the support block, a tread contactor slidably mounted on the flange edge contactor, and a flange contacting finger pivotally mounted to the tread contactor. In operation the assembly is moved radially toward the wheel until the wheel tread is contacted. The tread contactor thereafter retracts, causing the flange contacting finger to engage the gaging point on the wheel flange. Further, downward movement of the assembly causes the flange edge contactor to move into engagement with the wheel.