Patent ID: 6070503
Filing Date: 2000-06-06
Classification: B25B,B25G

Abstract:
A high torsion ratcheting driver handle for a driver bit having a shank, said handle comprising:an elongated body having an end portion formed with an inner annular wall that extends in an axial direction to define an axial hole that opens at said end portion;a ratcheting mechanism disposed in said axial hole, and including a gear member disposed to be rotatable and coaxial relative to said axial hole, said gear member having a coupling end adapted to engage the shank of the driver bit, and a rim portion disposed around said axial direction and provided with a tooth member that is spaced apart from said annular wall in a radial direction to define an annular chamber therebetween, said ratcheting mechanism further including a pawl member disposed in said annular chamber and having a fulcrum point lying in a fulcrum line parallel to said axial direction, and first and second tooth portions disposed at two sides of said fulcrum line opposing each other in such a manner that one of said first and second tooth portions engages said tooth member when said fulcrum point is shifted between first and second positions along a line parallel to a chord line relative to said gear member;a spring member including a mounting end secured to said fulcrum point, and a free end extending angularly from said mounting end around said gear member, said free end being slidably retained in first and second anchored points that are disposed angularly on said inner annular wall when said fulcrum point is shifted between said first and second positions, respectively;a retaining member disposed on said inner annular wall to slidably anchor said free end at, in clockwise direction, a downstream location which corresponds to said second anchored point, and an upstream location which corresponds to said first anchored point, wherein said tooth member is ratcheted by said second tooth portion in the counterclockwise direction against a first biasing action of said spring member generated when said free end is at said second anchored point and said mounting end is at said second position, and wherein said tooth member is ratcheted by said first tooth portion in the clockwise direction against a second biasing action generated when said free end is at said first anchored point and said mounting end is at said first position; andfirst and second barrier members disposed respectively to hinder the disengaged one of said first and second tooth portions from moving away from said tooth member in said radial direction when one of said first and second tooth portions is brought to engage said tooth member by shifting said fulcrum point between said first and second positions, thereby pulling or pushing said mounting end so as to drag or to move over said free end into said upstream location or said downstream location, respectively.