Abstract: A trailer hitch for attachment to a vehicle bumper for providing releasable coupling with a trailer coupling member. The hitch includes a coupling ball partially surrounded by an enclosure extending above the top of the coupling ball. A safety bar is received in slots formed in the surrounding wall. The safety bar, when installed, overlies the coupled arrangement of a ball joint and trailer coupling member so as to prevent their unintended separation. Further, the walls surrounding the coupling ball are pivotally mounted to the vehicle bumper and include a spring which contacts either the vehicle or its bumper to orient the enclosing walls in a preferred direction.

Abstract: An exercise machine especially for the legs and lower trunk of the human body includes a pair of foot supports mounted on a plate. Means connected to the plate oscillates the plate up and down in simple harmonic motion, and a pair of handles are provided above the plate at about hip level for gripping to steady a person exercising on the machine.

Abstract: A portable ski support fixture is disclosed which facilitates support and retention of a ski in either a flat or edgewise position for maintenance and repair of the ski, the fixture being manipulatable to a collapsed position for transporting and storage.