Abstract: An electromagnetic linear drive has a stationary unit, a mobile unit centered and coaxially placed with respect to the stationary unit and an enclosing assembly made of diamagnetic material to support and protect the stationary unit and the mobile unit. The stationary unit contains a coil, wound around a bobbin made of non-conductive and diamagnetic material including a stationary magnet coaxially attached to the lateral face of the bobbin. The mobile unit includes a mobile magnet fastened to a shaft made of diamagnetic material which holds, positions and further transfer the linear motion of the mobile magnet to the driven device. Two stationary units are used to obtain controlled movement in both direction. The permanent magnets are magnetized in the direction of their thickness, coaxially positioned and arranged to repulse each other. The coils are connected in series with the magnetic fields opposed.

Abstract: A spherical joint has an upper bearing assembly, a main supporting body, a lower bearing assembly, a linking body for linking the main supporting body and the lower bearing assembly, and an enclosing assembly. Four active hemispherical surfaces are defined. The upper bearing assembly has an active convex surface which, together with an active internal surface of the main supporting body forms an internal coupling. The external convex surface of the main supporting body cooperates with a concave active surface of the lower bearing assembly to define an internal coupling. The external and internal couplings compensate and adjust for wear and any deviation in concentricity between the couplings. The active surface of the lower bearing assembly is comprised a number of spring-loaded lobes equispaced from each other, and is covered with antifriction material.