Self-orientable wheel mechanism for furniture

Claim 1

A two wheel castor for furniture, comprising a vertical wall, a seat extending through said wall perpendicularly thereto and defining front tubular projections on either side of said wall, a shaft supported in said seat and having its opposed ends projecting outside of said seat on either side thereof, a pair of wheels pivotally secured to said opposed ends and having tubular hubs provided with outer collars close to said projections, a sleeve formed in said wall in the plane thereof and perpendicular and offset with respect to said seat, a pivot pin journaled in said sleeve and adapted to be inserted in a vertical socket of an article of furniture to which the castor is to be fitted, front bushings defined on either side of said wall and disposed around said projections such as to accomodate said hub slots cut at the lower area of said bushings and extending along an arc of a circle and defining ring portions between said slots and free ends of said bushings, said ring portions being deformed for engagement behind said collars such as to retain said wheels axially, a vertical hole formed in said wall and communicating with said seat, elastic means arranged in said hole and acting on said shaft, said seat being elongated in a substantially vertical plane thus permitting friction contact of said hubs with said deformed ring portions when the castor is in unloaded condition and free rotation of the hubs when the castor is in loaded condition.