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:
Oct. 23, 1990
Filed:
Mar. 13, 1989
Donald F Wilkes, Albuquerque, NM (US);
Other;
Abstract
An apparatus for converting rotary motion to linear motion includes a centrally located screw member and a concentrically positioned outer member that surrounds the screw member but is spaced therefrom in order to define an annular space between the outer member and the screw member. A plurality of planet assemblies are positioned around the screw member and within the annular space. Each planet assembly is comprised of a roller that has a plurality of annular grooves extending circumferentially around its exterior surface. Each pair of adjacent grooves define a ridge therebetween whereby each roller has a plurality of spaced annular ridges extending circumferentially around its exterior surface. The ridges on the rollers engage the helical thread on the screw member as well as annular grooves on the inner surface of the outer member. The outer diameter of the planet assemblies is at least equal to the outside diameter of the screw member. Further, a planet assembly carrier can be provided for holding the planet assemblies and for maintaining the planet assemblies in a symmetrical arrangement around the screw member.