An articulating power tool (10; 120) comprising: a main body (12; 126); a base member (17; 143) including a first power transmission part configured to receive mechanical driving power from the main body; an articulating member (15; 141) pivotably coupled to the base member, the articulating member including a second power transmission part (40; 130) mechanically coupled to said first power transmission part; and a locking device coupled to the articulating member for locking an orientation of the articulating member with respect to the base member, the locking device including an actuation lever rotatable about a pivot axis between a free position and a lock position; the locking device further comprising: a transitional locking member having a first cam surface; and an actuation locking member having a second cam surface, the actuation locking member coupled for rotation with the actuation lever; wherein the first and second cam surfaces cooperate to displace the transitional locking member between the lock position and the free position as the actuation locking member rotates about the pivot axis with respect to the transitional locking member, wherein the articulating member (14; 124) is configured to pivot with respect to the base member (17; 143) in the free position, and wherein the articulating member is configured to be locked at one of a plurality of predetermined angles with respect to the base member in the lock position; and, characterized in that the transitional locking member, the actuation locking member, and the actuation lever are disposed coaxially about the pivot axis. a main body (12; 126); a base member (17; 143) including a first power transmission part configured to receive mechanical driving power from the main body; an articulating member (15; 141) pivotably coupled to the base member, the articulating member including a second power transmission part (40; 130) mechanically coupled to said first power transmission part; and a locking device coupled to the articulating member for locking an orientation of the articulating member with respect to the base member, the locking device including an actuation lever rotatable about a pivot axis between a free position and a lock position; the locking device further comprising: a transitional locking member having a first cam surface; and an actuation locking member having a second cam surface, the actuation locking member coupled for rotation with the actuation lever; wherein the first and second cam surfaces cooperate to displace the transitional locking member between the lock position and the free position as the actuation locking member rotates about the pivot axis with respect to the transitional locking member, a transitional locking member having a first cam surface; and an actuation locking member having a second cam surface, the actuation locking member coupled for rotation with the actuation lever; wherein the first and second cam surfaces cooperate to displace the transitional locking member between the lock position and the free position as the actuation locking member rotates about the pivot axis with respect to the transitional locking member, wherein the articulating member (14; 124) is configured to pivot with respect to the base member (17; 143) in the free position, and wherein the articulating member is configured to be locked at one of a plurality of predetermined angles with respect to the base member in the lock position; and, characterized in that the transitional locking member, the actuation locking member, and the actuation lever are disposed coaxially about the pivot axis.