Abstract: A multipoint contact ball bearing in constructed to prevent damage to rolling surfaces of the balls and to ensure durability while maintaining radial load capacity. An inner raceway has a complex curved surface including a pair of side surface sections having a generating line shape with a radius of curvature larger than 50% of the ball diameter, and an inner raceway bottom section connecting inside end edges in the width direction of the side surface sections. The inner raceway bottom section is a concave curved surface having a generating line shape with a radius of curvature less than 50% of the ball diameter. The edges of both sides in the width direction of the inner raceway bottom section and the inside end edges of the inner raceway side surface sections are smoothly continuous, and finishing is performed on the inner raceway bottom section and the inner raceway side surface sections.

Abstract: In one embodiment, an apparatus for transferring carts may include a transfer surface, a loading station lift, a working station lift, and a controller. The transfer surface may include a loading station and a working station arranged laterally with respect to the loading station. The loading station lift may include loading station rollers that are in rotatable engagement with the loading station lift. The working station lift may include working station rollers that are in rotatable engagement with the working station lift. The controller that can actuate the loading station lift and the working station lift between a loading state with the loading station rollers and the working station rollers offset a relatively low distance above the transfer surface and a transferring state with the loading station rollers and the working station rollers offset a relatively high distance above the transfer surface.