Abstract: This releasable screw and nut bearing mechanism comprises an internal central screw, a coaxial external nut constituting a socket made of several segments, the outer diameter of the screw being smaller than the inner diameter of the socket in order to provide a free gap therebetween in which a plurality of angularly spaced planet rolling members are disposed and adapted to mesh both with said screw and with said socket, this assembly being releasable by moving the socket segments radially outwards in order to free the screw from any meshing engagement with the rolling members, at any time, irrespective of the relative angular positions between the screw, the socket and the rolling members. Spring means may be provided for constantly urging the rolling members away from the screw, and cage means are provided for guiding the rolling members both axially and radially.

Abstract: This rolling-contact bearing is of the type comprising an internal screw, an external nut and, therebetween, in proper engagement with said screw and nut, a plurality of threaded planet rollers held at the proper relative angular spacing by means of their trunnions engaging bores provided to this end in end rings, said rollers comprise a cylindrical central plain portion having a diameter at the most equal to the root diameter of the threads of said rollers, said plain cylindrical portion is connected through rounded fillets to the adjacent threads of the rollers. This assembly, in the case of a simple nut, affords a higher degree of rigidity with a lesser degree of losses of movement.

Abstract: A screw-and-nut mechanism with a ball recirculation channel comprising bent, tubular inlet and outlet elements connected to each other by a connecting means, the tubular elements being engaged in a bore of the nut member in such a way as to emerge at the bottom of the thread, and the connecting means being embedded in an overmolding of the nut member.

Abstract: A ball-equipped screw and nut mechanism for conversion of axial to rotary motion and the reverse, includes mating screw and nut members, with a plurality of balls in a helical, ball-recirculation channel, and a transfer component in said nut providing a portion of the recirculation channel.

Abstract: A ball-equipped screw and nut mechanism including a train of balls in a helical ball-circulation channel defined between mating surfaces of screw and nut members. The screw member is tubular and has within its bore a core with a helical groove as a ball recirculation channel which communicates with the ball-circulation channel via radial holes extending through the wall of the screw member.