Twist-handled power tool with locking system

A power tool comprising:

• a first housing portion;
• a second housing portion disposed about the first housing portion for pivoting motion about a pivot axis;
• a powertrain having an output member, the output member extending from the second housing portion and being movable relative to an output member axis;
• a mounting hub coupled to one of the first and second housing portions for movement along the pivot axis;
• a lock bar mounted to the other one of the first and second housing portions;
• a first set of stop members coupled to the mounting hub;
• a second set of stop members coupled to the lock bar;
• a spring biasing the mounting hub toward the lock bar to cause engagement of the first set of stop members with the second set of stop members;
• an actuator coupled to the other one of the first and second housing portions, the actuator being configured to move the mounting hub away from the lock bar such that the first set of stop members disengages the second set of stop members;
• wherein the second housing portion is inhibited from pivoting about the pivot axis relative to the first housing portion when the first set of stop members is engaged to the set of second stop members, and wherein the second housing portion is permitted to pivot about the pivot axis relative to the first housing portion when the first set of stop members is disengaged from the set of second stop members.