Abstract: A mattress having a head end and a foot end comprises a first support section configured to support an occupant's feet, legs, and seat, and a second support section located adjacent the head end of the mattress to support an occupant's back and head. A portion of the head support section is movable toward the head end of the mattress as the second support section is moved to an elevated position relative to the first support section.

Abstract: The constant velocity universal joint comprises an outer joint member 1 that has three curved guide grooves 1b formed in the axial direction on a spherical inner circumferential surface 1a thereof, an inner joint member 2 that has three curved guide grooves 2b formed in the axial direction on a spherical outer circumferential surface 2a thereof, three torque transmitting balls 3 disposed in ball tracks that are formed by the coordination of the guide grooves 1b of the outer joint member 1 and the guide grooves 2b of the inner joint member 2, a cage 4 that holds the balls 3, and elastic pressing means 5 interposed between the outer circumferential surface 2a of the inner joint member 2 and the inner circumferential surface 4a of the cage 4.

Abstract: A fixed member is fixed to a rotation shaft. The rotation member is rotatably fitted to the rotation shaft. In a state in which one of end surfaces of the rotation shaft abuts against one of side surfaces of the fixed member, the rotation shaft and the fixed member are welded and fixed to each other by high density energy beams radiated from a direction of the other side surface of the fixed member.