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. 22, 1998
Filed:
Jul. 29, 1996
James E Shaffer, Maitland, FL (US);
Other;
Abstract
A roller screw assembly includes a threaded rod, a nut having internal, non-helical grooves and a plurality of externally grooved elongated rollers seated circumferentially about the rod and captured in place by the nut. The grooves in the nut and rollers are selected to have the same spacing as the pitch of the rod threads and with a corresponding profile so as to allow intermeshing engagement between the nut, rollers and rod. The inner surface of the nut is formed such that a cross-section normal to the axis of the rod illustrates at least one lobed area which is of sufficient extent to allow a roller in that area to translate axially with respect to the rod. The number of lobes is dependent on the number of threads or parallel helices formed on the rod. Rotation of the nut with respect to the rod enables axial translation of the nut with respect to the rod by recirculation of the grooved rollers at the lobed region.