Abstract: This invention directs itself to an improved ladder positioning mechanism which includes an external shell member (1) in combination with an internal shell member (2) rotatably displaceable each with respect to the other. A claw member (4) is insertable within the external shell member (1) and is rotatable to linearly displace a lock block member (37) into and out of slots (22) formed in a peripheral surface of the internal shell member (2). The lock block member (37) is coupled through a shaft (36) to a ball shaped edge member (33) which is insertable within a pair of biased arm members (323) and (324) formed within an engagement seat (32).