Abstract: A twin-wheel castor has a moulded body with a through bearing bore in which stub axles of twin moulded wheels are received. The axles have circumferential grooves respectively engaged by two axially-spaced circumferential series of internal body projections moulded within the through bore of the body. The projections are arranged with the two series thereof angularly staggered so that in axial projection no two projections overlap. The engagement of the projections with the axle grooves provides positive retention of the wheels with snap-on assembly thereof to the body.

Abstract: A castor has a domed wheel rotatably mounted about an inclined axis on a body itself pivotally mounted on or about a vertical mounting spindle. The wheel axis is offset laterally of the spindle axis and the wheel has a rim with a convex part-spherical ground-engaging surface. The body is moulded with an integral bearing boss and the wheel is moulded with an integral bearing boss, the bosses engaging one within the other to provide a bearing for the wheel. The spindle is located in a bore in the body and engages in a peripheral groove in the boss to locate the wheel axially with respect to the body. A sleeve-like portion of the body moulding concentric with and surrounding the boss provides an outer female bearing surface for the wheel boss.