Patent ID: 7591604

Claim:
A hand-operated, motor driven screwdriver comprising: a body having a knuckle joint mechanism providing relative pivotal movement between a first and second body member about a pivot axis, said first and second body members each having axially spaced first and second sets of teeth, said mechanism comprising: an actuator having a first and a second push button portion, the first and second push button portions being coaxially aligned on the pivot axis and each having a set of teeth arranged to engage the sets of teeth of the first and second body members, said first and second push button portions being moveable along the pivot axis relative to the body members, between a locking position in which both sets of push button portion teeth engage both first and second sets of body members teeth, and (a) a first release position in which the set of first push button teeth engages the first body member first set of teeth only and the set of second push button teeth engages the second body member first set of teeth only and (b) a second release position, in which the set of first push button teeth engages the second body member second set of teeth only and the set of second push button teeth engages the first body member second set of teeth only, the first push button portion being rotatable about the pivot axis relative to the second push button portion to enable the second body member to move with respect to the first body member when the actuator is in either the first release position or the second release position.