Abstract An apparatus for guiding the axial displacement of a cylindrical member comprises a bush in which the member is guided by means of several series of balls, each of which forms a closed circuit and comprises a rectilinear row of balls in rolling contact with the guided member. The series of balls are guided in guide races by means of a cage arranged in the bush and comprising, for each series of balls, a rectilinear slot in which the balls of the rectilinear row roll, a groove parallel to the slot and defined by the outer side of the cage, and two incurved ramps connecting the corresponding ends of the slot and groove. The cage is constituted by a tubular socket in a single piece with a solid wall in which are provided the slots, grooves and ramps. The bush is tubular and cylindrical and is constituted by a hard injected or moulded material in which are embedded parts projecting inside the bush, these parts serving as a race for the balls in rolling contact with the guided member.
Apparatus for guiding axial displacement of a cylindrical member, the apparatus comprising a bush, several series of bearing means for guiding the member in the bush, each series forming a closed circuit and comprising a rectilinear row of balls in rolling contact with the cylindrical member; cage means located in the bush for guiding the several series of bearing means in guide races and having, for each series of bearing means and for allowing the balls of the respective rectilinear row to roll, a rectilinear slot in the cage means, a groove parallel to the slot and defined by the outer side of the cage means and two incurved ramps connecting the corresponding ends of the slot and groove; the cage means being constituted by a tubular socket with a solid wall in which the slots and grooves are provided; the bush being tubular and cylindrical and being constituted by a hard material and in which are embedded means, projecting inside the bush, for providing said races for the balls in rolling contact with the guided member, and said races being curved with respect to the rolling axis of the balls in order to be able to adjust the clearance of the balls by rotating the tubular socket.
Claim 2
Dependent Claim
208 words
Apparatus for guiding axial displacement of a cylindrical member, the apparatus comprising a bush, several series of bearing means for guiding the member in the bush, each series forming a closed circuit and comprising a rectilinear row of balls in rolling contact with the cylindrical member; cage means located in the bush for guiding the several series of bearing means in guide races and having, for each series of bearing means and for allowing the balls of the respective rectilinear row to roll, a rectilinear slot in the cage means, a groove parallel to the slot and defined by the outer side of the cage means and two incurved ramps connecting the corresponding ends of the slot and groove; the cage means being constituted by a tubular socket with a solid wall in which the slots and grooves are provided; the bush being tubular and cylindrical and being constituted by a hard material and in which are embedded means, projecting inside the bush, for providing said races for the balls in rolling contact with the guided member, and said races being curved with respect to the rolling axis of the balls in order to be able to adjust the clearance of the balls by rotating the tubular socket.