Abstract: A method of attaching a hollow end knob to the handle portion of a hollow ball bat, in which the hollow bat handle portion positioned within the cavity of the hollow end knob is outwardly deformed to a transverse cross-section substantially larger than the cavity opening. The outward deformation is preferably accomplished by applying pressure against the transverse exterior surface of the end knob which in turn bears against the circular end of the hollow bat handle. The interior transverse surface of the end knob may have a circular recess corresponding to the end of the bat handle.A hollow metal ball bat having a hollow end knob encompassing an enlarged section of a hollow handle portion. The opening of the end knob is smaller than the contained enlarged handle portion, and fits over the smaller cross-section of the handle portion adjacent the enlarged portion.

Abstract: A flexible mandrel for use in bending tubes and especially for producing tight bends in thin wall, high strength metal tubing. The mandrel comprises a series of ball members each of which is adapted to nest within the preceding ball of the series as the mandrel is flexed. The balls are free to rotate transversely and to slide longitudinally on a series of rigid link members which are flexibly interconnected. The balls and links are so constructed that as the mandrel is flexed, each ball pivots around a point located at or near the geometrical center of its outer curved surface.

Abstract: A novel structure in a scooter type sport vehicle is presented. The vehicle is of the type which includes a supporting frame structure in combination with at least front and back wheels mounted for rotation with respect to said frame to define a wheeled vehicle. A rockable platform for supporting a standing rider is supported pivotably on said frame. The platform includes an extended forward portion so as to make the platform non-symmetrical with respect to the pivot, and the platform may be rocked back and forth on the frame about the pivot point with increased leverage exerted in the forward direction. Driving means responsive to the forward rocking movement of the platform is included for producing a unidirectional turning moment on the real wheel, whereby a rider may shift his weight to forwardly rock the platform and thereby propel the wheeled vehicle forward.

Abstract: A food-cutting machine for slicing, grating or shredding foodstuffs such as fruits, vegetables, meats or cheeses. The device is designed particularly for home kitchen use and features a hollow body or housing, the interior of which is adapted to storage of a set of stacked or nested cutters having blades for producing different cuts in various food items. The housing latches to a suction base by means of a cam lock operated by a lever which also operates the suction disc of the base. When the housing is latched to the base, the base is simultaneously fastened to an appropriate work surface by the suction of the disc. When the lever is raised to unlatch the housing, the suction is released so that the device may be moved to another location.

Abstract: An operating circuit for a semiconductor switch device of the type that passes electrical current from a source to an electrical load by forward biasing of the semiconductor's control terminal includes a resistance bridge network having in an arm thereof the control terminal to one main terminal circuit of the semiconductor switch, and a bias control for alternately applying forward bias and reverse bias to the control terminal through the bridge network, whereby a voltage is developed across the bridge output during the interval in which the control terminal is reverse biased that is representative of the junction temperature within the semiconductor. The temperature representative voltage is observed, monitored, and used for indication and control.

Abstract: A side pocket mandrel is of hollow metal tubing having a cross-section that is symmetrical about an axis and in which one of the symmetrical cross-section halves reveals a smoothly continuous convex curve, comprises a first, second and third circular arc portions of different radii and different centers of gyration; the first having a radius r.sub.1, the second r.sub.2, and the third a transcending radius r.sub.3 with r.sub. 1 greater than r.sub.2 and with r.sub.3 being less than three times the sum of the radii r.sub.1, r.sub.2 and the distance between the centers of the first and second portions, but no less than one-half of such sum of r.sub.1, r.sub.2 and that distance between the centers.

Abstract: A hockey stick is formed of a fiber-reinforced plastic blade integrally molded onto a tapered metal shank which mates with a rectangular tubular metal shaft or handle to form a four-plane lap joint which is bonded with a thermoplastic adhesive. The metal shank includes a longitudinally tapered recess which is filled by the molded plastic of the blade to form a virtually indestructible bond between blade and shank. The configuration provides great strength and precisely controllable flexibility with easy replaceability of the blade.