Manipulator transporting heavy discs - has cams which pass through disc bore and are spread by rotary shafts

The manipulator incorporates at least one arm on which an actuator is mounted. The rod from the actuator engages with a rack which in turn engages with two pinions which are mounted at the end of parallel shafts (4). Two cams (1, 2) are mounted at the end of the shafts. The cams when folded together have a circular contour and can be inserted in e.g. the bore of a wheel. When the cams are rotated by the actuator, the top sections centralise the bore, while the bottom sections grip under the edge of the bore.