Patent ID: 8220365
Filing Date: 2012-07-17
Classification: B25B

Abstract:
1. A planetary gear-driven 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 secured to a nut driving ring body, said cover including a central opening for rotatably receiving a sun gear cylinder, and an opening for rotatably mounting a planetary gear, 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 supports a sun gear and 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 sun gear and the stud structure when the nut is driven by the nut driving ring body, said planetary gear being engaged with the sun gear and the ring gear, wherein said planetary gear includes at least one planetary gear stud that extends through said cover, said planetary gear stud being rotated by a driving device to cause said planetary gear to rotate, and wherein rotation of said planetary gear causes relative rotation between the ring gear and the sun gear, thereby causing the nut driving body to exert a magnified driving force on the nut.