Bearing for rectilinear motion

Bearing having in a body two rectilinear inner raceways interconnected by semi-circular inner end surfaces, particular outer end surfaces defining roller re-circulation passages with the semi-circular inner surfaces, and rollers which roll along the raceways and pass round the re-circulation passage. The rollers are guided at the roller ends by guide surfaces and are exposed on one of the sides of the bearing body. The rollers are retained radially to within a predetermined distance from the rectilinear inner raceways by means associated with the rollers and disposed in grooves in the bearing body adjacent the guide surfaces. Alternatively, the means associated with the rollers may be engaged in grooves defined between an edge of an aperture in a plate and a part of the bearing body, the plate being interposed between the corresponding end of the rollers and a part of the bearing body and defining an end guide surface for the rollers.