Patent ID: 6202759
Filing Date: 2001-03-20
Classification: B25D

Abstract:
A Switching device for a power tool comprising:a housing;a rotary collar located outside said housing, said rotary collar having a plurality of axial slide grooves parallel to a central axis;an output axle with stepped portion having a speed reducer in said housing;a fixing gear wheel;a movable gear wheel provided serially with said fixing gear wheel at said stepped portion of said output axle, said stepped portion abutting said movable gear wheel, and said fixing gear wheel having peripheral teeth in cooperation with peripheral teeth provided on said movable gear wheel, said output axle, said fixing gear wheel and said movable gear wheel being combined in said housing, said fixing gear wheel being immovably fixed in said housing, said movable gear wheel being adapted to moving along said output axle;a fixing seat;a spring;a fixing ring; anda switching member, said fixing seat, said spring, said fixing ring and said switching member being serially provided on said output axle, said spring being mounted between said fixing seat and said switching member which is provided peripherally thereof with a plurality of protruding blocks with different sizes, said protruding blocks being matched with said axail slide grooves provided in said rotary collar, said switching member being rotated by rotation of said rotary collar, said fixing ring being provided also between said fixing seat and said switching member and being provided centrally thereof with a through hole for extending therethrough of said output axle, said through hole being provided on the inner edge thereof with a plurality of notches with their sizes corresponding to those of said protruding blocks, when said protruding blocks are aligned with said corresponding notches thereof, said switching member being allowed to get through said through hole of said fixing ring, on the contrary, when not in alignment, said switching member being not allowed to get through said through hoel.