| CPC B25B 23/0014 (2013.01) [B25B 23/0035 (2013.01)] | 8 Claims |
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1. A driving head-changeable tool, including:
a main body, including a chamber and an assembling end connected to each other, the chamber including a plurality of concave portions and a plurality of convex portions alternatively arranged circumferentially, the chamber being configured for insertion of a polygonal ball joint, the chamber further including at least one receiving hole disposed therethrough radially, each of the at least one receiving hole receiving a blocking member;
an outer sleeve, disposed around the main body, an inner wall of the outer sleeve including a recess and a projection protrusive relative to the recess, the outer sleeve being slidable between a first position and a second position relative to the main body;
wherein when the outer sleeve is located in the first position, the projection urges the blocking member to project within the chamber to retain the polygonal ball joint in the chamber; when the outer sleeve is located in the second position, the recess corresponds to the blocking member, the blocking member is retractable in the recess to be not protrusive within the chamber so that the polygonal ball joint is disengageable from the chamber;
wherein an end of each of the plurality of convex portions remote from a bottom of the chamber includes a bevel, the chamber further includes an annular groove adjacent to the bottom thereof, the driving head-changeable tool further includes a conical coil spring, the conical coil spring includes a large diameter end and a small diameter end opposite to each other, the large diameter end is engaged within the annular groove, and the small diameter end biases the polygonal ball joint outwardly;
wherein the chamber further includes a first stepped portion near an opening thereof, and the first stepped portion is next to the bevel.
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