Abstract: A sliding universal joint comprises a male element (1) intended to be fixed to a first shaft and including arms (6). Each arm bears a ball-type journal (7) which is integral therewith. A female element (20 intended to be fixed to a second shaft defines two guide paths which are situated on either side of each journal. Intermediate member (3, 4) are interposed between each journal and the associated guide paths. These intermediate members comprise a first member (3) which interacts with a first path (8) of the guide paths and has properties, with respect to the transmission and/or generation of vibration, which are different from those exhibited by the interaction between the second member (4) and the second guide path.

Abstract: The machine comprises a support surface for a reference surface on the body of the workpiece, and a device for fixing the body on the support surface and releasing the body. A withdrawable device is provided for angularly positioning the blank on the support surface. The device comprises a V-shaped recess facing the support surface. The machine permits a center-less grinding of cylindrical surfaces in overhanging relation and in particular trunnions of tripods for homokinetic joints.

Abstract: The or each workpiece carrying plate is connected to a rotary spindle by three elastically yieldable struts which are arranged around the axis of rotation of the spindle. The plate carries a peripheral cam which is engaged by a roller carried by an elastically yieldable strip. Application is to the center-less grinding of trunnions of tripod elements for homokinetic joints.