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US 4,884,466 AGranted
Screw with recirculated satellite rollers
OwnerBernard Duruisseauinventor
Life of this patent
Estimating the term…
Abstract
Rollers situated on the circumference of a threaded screw inside a nut have a cavity at each end containing a spring and a pin. When a roller enters the recirculation groove, the spring/pin assembly bearing against the cap recirculates the roller towards the interior of the nut. By enabling the roller to be repositioned at the time of its reinsertion between the threads of the screw and of the nut, this arrangement provides for flexible operation of the screw.
Claims23
A device for providing rotation and longitudinal displacement of a screw comprising a threaded nut;
- a threaded screw centrally positioned within said nut by a set of rollers, said screw having a circumference and said set of rollers being arranged around said circumference;
- at least one clearance space for the recirculation of said rollers;
- a cap attached to each end of the nut leaving a free passage for said screw but retaining each of the rollers in said set of rollers inside the nut;
- and elastic means associated with the rollers for returning each roller to a substantially central position in the nut when the roller is positioned in said at least one clearance space, wherein the returning is caused by a force of the elastic means which builds during translation of each roller toward one of said caps while the roller is positioned out of said at least one clearance space.
1 more element
Dependencies are inferred from the claim text.