US Patent 10059230 Seat sliding device

A seat sliding device that supports a seat so that the seat is slidable is provided. The seat sliding device includes a fixed rail having a first rail-surface and a second rail-surface, a movable rail that is configured to be slidable relative to the fixed rail, a roller that is mounted on the movable rail, a first rolling element that is formed into a sphere, and a first retainer that is mounted on the movable rail. The roller receives a downward load imposed on the movable rail and rolls to contact the first rail-surface. The first rolling element rolls to contact the second rail-surface. The first retainer presses the first rolling element against the second rail-surface while rotatably retaining the first rolling element.