Patent ID: 6792816
Filing Date: 2004-09-21
Classification: B25B

Abstract:
A bit adapter for a torque detector, comprising:a shaft pedestal including an integrally formed square step that closely engages with a bit coupling part provided on a torque detector, said shaft pedestal having a centrally located screw hole therein; a threaded shaft configured such that a first end thereof engages in a retractable manner with said screw hole, and such that a second end thereof couples with an output shaft of a rotary fastening device; a helical compression spring enclosing said threaded shaft in which the threaded shaft is inserted and disposed concentrically; a flange part disposed opposite said pedestal relative to said threaded shaft and elastically sandwiching said helical compression spring with said shaft pedestal; a bearing holder that fits with play with said threaded shaft and, with said flange part, encloses and holds said threaded shaft and said flange part via a thrust bearing and is disposed to abut the flange part in a freely slidable manner; and shaft positioning means for controlling the position of said shaft disposed to extend from said shaft pedestal to a position between a distal end of said helical compression spring and said second end of said threaded shaft so as to straddle said helical compression spring, said threaded shaft being inserted and disposed through opposed ends of said shaft positioning means, said shaft positioning means including a support plate enclosure member in a shape of a three-sided rectangle and having a side surface extending laterally along an exterior of said helical compression spring and said bearing holder into which said threaded shaft is inserted and disposed, one side of said shaft positioning means being fixed on said shaft pedestal and said threaded shaft passing through an other end thereof.