Abstract: The joint comprises a ball (4) held between two seats (5 and 6) of the members (1, 2) to be joined, and it further comprises fittings (7, 8) bound to the members (1, 2) respectively, connected together through an intermediate jointed ring (12). A spring (13) maintains the contact between the ball and the seats. A rim (15) of the ring retains the ball (4) in case of disjunction. The ball (4) provides large accuracy in the position of the centre of rotation and the remainder of the joint maintains cohesion of the assembly.

Abstract: The joint comprises a ball (4) held between two seats (5 and 6) of the members (1, 2) to be joined, and it further comprises fittings (7, 8) bound to the members (1, 2) respectively, connected together through an intermediate jointed ring (12). A spring (13) maintains the contact between the ball and the seats. A rim (15) of the ring retains the ball (4) in case of disjunction. The ball (4) provides large accuracy in the position of the centre of rotation and the remainder of the joint maintains cohesion of the assembly.

Abstract: Machine for measuring by coordinates having 1 to n measuring axes comprising a piece support and at least one carriage moving on a measuring axis, a sensing device equipping a carriage, characterized by the fact that each axis comprises a carrying structure (1, 2) and a metrological reference structure (11, 21) associated with position sensors (23, 24, 33), these two structures being connected by a connection member, said sensors determining the position of the reference structure of row n in relation to the reference structure of the measuring axis of row n-1.