Relative movement obtained by co-operating spherical surfaces, e.g. ball-and-socket joints

Full Title

Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members (B23Q37/00 takes precedence ) > Movable or adjustable work or tool supports > characterised by constructional features relating to the co-operation of relatively movable members; Means for preventing relative movement of such members > Relative movement obtained by co-operating spherical surfaces, e.g. ball-and-socket joints