Patent ID: 8225698
Filing Date: 2012-07-24
Classification: B25B

Abstract:
1. A sun gear driving tool for rotating an internally-threaded nut relative to an externally-threaded stud structure, said externally-threaded stud structure including an axially-extending polygonal inner blind hole, opening, or projection at a top end, comprising: a cover arranged to be fixed to a nut driving ring body, said cover including a central opening for providing access to a sun gear cylinder, said sun gear cylinder being engageable through the central opening by an operating tool that rotates the sun gear cylinder relative to the cover and nut driving ring body, wherein said nut driving ring body includes a ring gear and a downwardly extending sleeve that fits over the nut to cause the nut to rotate with the nut driving body, wherein said sun gear cylinder includes or is integral with a sun gear and is rotatably mounted on a planetary gear radial arm base, wherein said planetary gear radial arm base has a polyhedral prismatic structure that engages said polygonal opening or polygonal projection at the top end of the stud structure to prevent relative rotation between the planetary gear radial arm base and the stud structure when the nut is driven by the nut driving ring body, wherein at least one planetary gear is rotatably mounted on the planetary gear radial arm base and engaged with the sun gear and the ring gear, and wherein rotation of said sun gear by said operating tool causes relative rotation of the ring gear through the planetary gear to drive the nut driving ring body and exert a magnified driving force on the nut.