Abstract: A hitch for vehicle trailers for facilitating interconnection of the tow and towed vehicles, suitable for use with recreational vehicle trailers, wherein the hitch includes an extensible and universally pivotable support for one of the hitch components permitting an easily achieved interconnection between the vehicles whereby the tow vehicle can pull the trailer to a near alignment and the hitch members to a towable condition.

Abstract: A control system for tracer controlled machine tools, such as milling machines and the like, wherein a template is employed to machine a contour on a workpiece. In accord with the invention the machined contour is of a uniform transverse cross-sectional configuration throughout its longitudinal length, and the template is supported on a carriage as to be fixed with respect to the tracer control in the direction of the length of the machined contour. The support of the template, and the use of positioning means to maintain the template in a predetermined relationship to the cutting tool and tracer permits a two-dimensional template to be utilized in the machining of three-dimensional contours.