Patent ID: 9162348
Filing Date: 2015-10-20
Classification: B25B

Abstract:
1. A steering and positioning assembly for mounting into a ratchet screwdriver so as to control a rotation mode and positioning state of a shaft lever of the ratchet screwdriver, the steering and positioning assembly comprising: a main body having a mating portion formed at one end thereof, said mating portion adapted to be connected to the ratchet screwdriver, said main body having a central axle hole extending across said main body; a ratchet assembly rotatably mounted into said central axle hole of said main body, said ratchet assembly having multiple ratchets with a fine teeth pattern arranged on a periphery of said ratchet assembly, said ratchet assembly having a coupling portion formed at one end of said ratchet assembly adjacent said central axle hole, said coupling portion adapted to enable insertion of the shaft lever of the ratchet screwdriver; a pair of radial holding tanks arranged vertically in parallel relationship across said main body in relation to said central axle hole, each of said pair of radial holding tanks defining an upper chamber and a lower chamber, said pair of radial holding tanks arranged at a pair of lateral sides of the ratchet assembly; a pair of upper snapping blocks arranged in a multi-tooth meshing pattern, said pair of upper snapping blocks separately assembled into the upper chamber, each of said pair of upper snapping blocks being formed by powder metallurgy and molded into a block shape, each of said pair of upper snapping blocks having multiple snapping teeth arranged so as to mesh with the ratchets of said ratchet assembly; a pair of downward abutting pieces separately assembled in vertically slidable relationship into the lower chamber of said pair of radial holding tanks, each of said pair of downward abutting pieces having a cross-frame and an abutting portion, a top of the abutting portion normally extended upwardly so as to abut a bottom of the upper snapping block; an elastic abutting member assembled above said pair of upper snapping blocks, said elastic abutting member urging said pair of upper snapping blocks downwardly such that said pair of upper snapping blocks are normally meshed with said ratchet assembly; a revolving drum sleeved onto a periphery of said main body, said revolving drum having a pair of grooves in spaced relation on an inner wall thereof in correspondence to said pair of downward abutting pieces such that a bottom of said cross-frame snaps therein, a bottom of said cross-frame of one of said pair of downward abutting pieces is disengaged from the groove when said revolving drum is rotated in one direction or the other direction, said bottom of said cross-frame being shiftable upwardly by a pushing of said inner wall of said revolving drum, said pair of upper snapping blocks being disengaged from said ratchet assembly so as to switch a rotatable direction of the ratchet screwdriver when the abutting portions of said pair of downward abutting pieces push upwardly toward the corresponding upper snapping blocks; and a split positioning member assembled onto the revolving drum in correspondence to said main body so as to position said revolving drum when said revolving drum is rotated to a desired position.