STEERING AND POSITIONING STRUCTURE OF A RATCHET SCREWDRIVER

摘要

A steering and positioning structure of a ratchet screwdriver has a main body, ratchet assembly, radial holding tank, two upper snapping blocks in multi-tooth meshed pattern and two downward abutting pieces, as well as an elastic abutting member, revolving drum and revolving drum split positioning member. The upper snapping blocks are activated in tune with the downward abutting pieces, such that the upper snapping blocks can be formed by means of powder metallurgy and demolding. Multiple snapping teeth could be formed on the snapping blocks. As the snapping teeth can mated with the ratchets of the ratchet assembly in multi-tooth meshing pattern, the structure can meet the multi-tooth meshing structural demands for convenient forming, and also improve substantially the torsion of the ratchet screwdriver, enhance the ease-of-operation and mass production for higher economic benefits.

主权项

1. A steering and positioning structure of ratchet screwdriver, wherein said steering and positioning structure is mounted into a preset ratchet screwdriver, so as to control the positive, reverse or bi-directional rotation mode and positioning state of the shaft lever of the ratchet screwdriver; said steering and positioning structure comprising:
a main body, at one end of which a mating portion is formed to be incorporated onto the ratchet screwdriver, and a central axle hole is transversely set across the main body; a ratchet assembly, rotarily set into the central axle hole of the main body; multiple ratchets with fine teeth pattern are arranged on the predefined periphery of the ratchet assembly, and a coupling portion is formed onto one end of the ratchet assembly located towards the central axle hole, enabling insertion of the shaft lever of said ratchet screwdriver; two radial holding tanks, arranged vertically in parallel across the main body correspondingly to the central axle hole; the radial holding tanks are defined to form an upper chamber and a lower chamber, and located correspondingly at two lateral sides of the ratchet of the ratchet assembly; two upper snapping blocks in multi-tooth meshing pattern, separately assembled into the upper chamber of the radial holding tank; said upper snapping blocks are fabricated by means of powder metallurgy and &molding to form the predefined blocks; stepped multiple snapping teeth are formed on the upper snapping blocks correspondingly to the ratchets of the ratchet assembly, enabling multi-tooth meshing with the ratchets of the ratchet assembly; two downward abutting pieces, separately assembled into the lower chamber of the radial holding tank in a vertical sliding state; said downward abutting pieces comprise of a cross frame and limited abutting portions; the top of the limited abutting portion is normally extended upwards to be abutted onto the bottom of the upper snapping block, an elastic abutting member, assembled above two upper snapping blocks of the main body, and used to flexibly press downwards two upper snapping blocks; so the upper snapping blocks in normal state are meshed with the ratchet assembly; a revolving drum, sleeved on the periphery of the main body in a rotatable state; two grooves are set at interval on inner wall of the revolving drum correspondingly to the downward abutting pieces, such that the bottom of the cross frame of the downward abutting pieces could be snapped-in; when the revolving drum is rotated positively or reversely, the bottom o cross frame of one downward abutting piece is disengaged from the groove, and shifted upwards under the pushing of the inner wall of the revolving drum; then the limited abutting portions of the downward abutting pieces push upwards the corresponding upper snapping blocks, so that the upper snapping blocks are disengaged from the ratchet assembly to switch the rotatable direction of the ratchet screwdriver; a revolving drum split positioning member, assembled onto the revolving drum correspondingly to the main body, such that the revolving drum can be positioned when its rotated to preset angle; with this design, the present invention could meet the multi-tooth meshing structural demands for convenient fabrication and demolding, and also increase substantially the torsion of the ratchet screwdriver and mass production by means of powder metallurgy and demolding.