Patent ID: 8225699
Filing Date: 2012-07-24
Classification: F16B

Abstract:
1. A screw and nut structure coaxially driven by a sun gear, comprising: a stud having an axial blind hole for rotatably receiving a boss of a sun gear cylinder, said sun gear cylinder having sun gear formed thereon or integral therewith and a polyhedral structure at a top end for engaging a driving tool to cause said sun gear to rotate, a cover arranged to be secured to a top end of the stud, said cover providing protection for said sun gear cylinder and at least one planetary gear and including an opening to enable engagement between said polyhedral structure of the sun gear cylinder and said driving tool; and a drivable nut having an exterior including a surface with a polygonal shape and an interior including an internally threaded portion and a ring gear formed in the nut or integral therewith, said nut being threaded onto said stud when rotated by the said sun gear and said planetary gear; wherein said cover includes a central opening for rotatably receiving a sun gear cylinder, and an opening for rotatably mounting a planetary gear, wherein rotation of said sun gear causes rotation of the ring gear via the planetary gear to exert a magnified driving force on the nut, and wherein said cover is secured to said stud by at least one threaded jack post, said jack post being threaded into an opening in a top of said stud and extending through said planetary gear, said planetary gear being rotatable around said jack post.