Patent ID: 8151671

Claim:
A tool adaptor, comprising a first work piece and a second work piece, the first and second work pieces being pivoted by a pivoting axle, the first work piece being swayable about the second work piece, a block element being sleeved on the first work piece and slidable between a first position and a second position, the block element abutting against the first and second work pieces simultaneously as the block element locates at the second position, restricting the sway of the first work piece about the second work piece; wherein the block element is tube-shaped, the block element has a first opening and a second opening communicating with each other, the second opening mounts the second work piece as the block element locates at the second position; wherein the second work piece has a mounting portion laterally extending therefrom, the mounting portion has a configuration substantially corresponding to the second opening to be selectively received in the second opening; wherein a positioning body and a positioning groove structure are disposed between the block element and the first work piece, the positioning body is engageable with the positioning groove structure to limit the travel of the block element within the first and second positions; wherein the block element has an inner surface contacting the first work piece, the positioning groove structure includes two annular positioning grooves spaced disposed on the inner surface, each annular positioning groove has an inner side wall close to the other annular positioning groove and has an outer side wall away from the other annular positioning groove, each outer side wall is perpendicular to the inner surface, each inner side wall makes an obtuse angle to the inner surface, each annular positioning groove has a profile being trapezoid, the positioning body is disposed on the first work piece and selectively protrudes from an outer periphery of the first work piece to be received in one of the annular positioning groove as the block element locates at the first position or the second position.