Abstract: A wheel chock assembly for preventing movement of a wheel relative to the surface on which it is resting includes a pair of wedge members positionable in spaced apart relation one to another and interconnected by a bar. At one end, the bar is slidingly received by aperture means provided in a first wedge member, and at its other end it is fixedly attached to the second wedge member. A tab having an aperture is slidingly received by the bar and is disposed adjacent the first wedge member. Abutment of a portion of the tab against the first wedge member causes pivoting movement of the tab and locking engagement between an edge of the tab aperture and the bar, thereby preventing relative outward movement of the two wedge members.

Abstract: A trolley assembly for use in an automobile lift rack employs individual trolley wheel mounts wherein the wheel is supported by a plurality of elastomeric mounts arranged in vertically displaced, mutual relationship to prevent bending of the mounts when the trolley assembly is loaded.

Abstract: A jack assembly is pivotally mounted to a carriage which is in turn mounted by trolley wheels to a pair of track mounted rails and carries a wheel at its lower end for engagement with the floor as the tracks are lowered, thereby to pivot the jack assembly into a folded-up, generally horizontal position.

Abstract: There is described an instrument and method for adjusting toe relative to the tracking axis of the vehicle by initially measuring the toe angles of the two front or rear wheels relative to the planes of the other two wheels on the same respective sides of the vehicle, and then adjusting the toe angles by one-half the difference between the initially measured angles.

Abstract: This invention relates generally to wheel alignment devices, and specifically to such a device in which accurate toe can be established even if the angular relationship of the device to a reference line, such as the horizontal, changes during the toeing procedure.