Patent ID: 7191677

Claim:
An adjustable angle drive attachment releasably connectable to and usable with a rotary tool, the adjustable angle drive attachment comprising: an input housing; an output housing; an input shaft having a chuckable free end not part of the rotary tool and journalled to the input housing for rotation about an input axis; an output shaft journalled to the output housing for rotation about an output axis; a circular interface between the input housing and the output housing concentric about an adjustment axis that is oblique relative to the input and output axes, the input housing and the output housing rotating relative to each other about the adjustment axis to adjust the angle between the input shaft and the output shaft; gearing rotatably coupling the input and output shafts such that the input and output shafts rotate in unison; an input gear on the input shaft; an output gear on the output shaft; an intermediate transmission gear including a first gear face meshing with the input gear and a second gear face meshing with the output gear, the transmission gear mounted for rotation about the adjustment axis between the input and output axes to transmit rotation between the input and output shafts; a transmission shaft having a first and second ends earned by the input and output housings, respectively, the transmission shaft supporting the intermediate transmission gear between the first and second ends; and wherein the first and second ends of the transmission shaft are journalled to the input and output housings, respectively.