The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 30, 1980
Filed:
May. 04, 1978
Sven W Nilsson, Partille, SE;
SKF Nova AB, Gothenburg, SE;
Abstract
A device for transferring a rotational motion into a longitudinal movement or vice versa. The device comprises a cylindrical shaft (1), a sleeve (2) enclosing the shaft and displaceable along and rotatable relative thereto. A cage (3) is mounted between the sleeve and shaft for axial movement with the sleeve as a unit. A plurality of rolling bodies (4) are mounted in elongated apertures in the cage and are arranged during operation to roll in a closed track around the shaft. The track has a helical portion and a recirculation portion. The rolling bodies contact the shaft and the sleeve in the helical portion and are axially moveable in the recirculation portion. Cam profile members (5, 6) are arranged at the ends of the cage for actuating the rolling bodies in the recirculation portion. The rolling bodies are arranged in the apertures in the cage in such a manner that their axes form an angle to the cylindrical shaft, this angle corresponding to the pitch angle of the helical form of the helical track portion.