Patent ID: 8206038

Claim:
A linear motion guide unit; comprising: a pair of guideway members lying movable relatively to one another and having raceway grooves on their sides opposite to each other and extending in lengthwise direction, a flat cage plate extending in the lengthwise direction and retaining therein more than one rolling element of roller which is positioned at regular intervals in the lengthwise direction to roll through a raceway defined between the raceway grooves on the guideway members, and a mechanism for keeping the cage plate against straying or wandering out of a desired relative location to the guideway members, the mechanism being made up of a rack-pinion arrangement composed of a holder fitted into the cage plate, a pinion carried for rotation inside the holder, and racks lying in the lengthwise direction of the guideway members, one to each member, and in mesh with the pinion; wherein the cage plate has a window to fit over or conform to the holder; wherein the holder has a dimension in a transverse section to fit snugly within just a transverse area of the raceway defined between the raceway grooves opposite to each other, the holder having sides extended in the lengthwise direction and bulged into triangular shapes in a transverse section to closely conform to the raceway grooves on the guideway members, and the holder having recesses lying in the lengthwise direction at apexes or ridges of the triangular shapes; wherein the recesses each have a width parallel with a thickness of the cage plate; and wherein the cage plate has edges around the window to fit into the recesses of the holder, thereby fastening the holder to the cage plate.