Hold back retractor

Claim 1

A DOOR LOCK COMPRISING A RELATIVELY STATIONARY FRAME HAVING A BEARING MEMBER ON AT LEAST ONE SIDE THEREOF, A TUBULAR SPINDLE ROTATABLY MOUNTED ON THE BEARING MEMBER AND HAVING ROLL-BACK MEANS THEREON, A LATCH RETRACTOR SLIDE MEMBER RECIPROCATABLY MOUNTED IN SAID FRAME FOR MOVEMENT TO TRANSVERSE DIRECTION AND MEANS ON THE SLIDE ENGAGEABLE WITH SAID ROLL-BACK MEANS FOR OPERATION THEREBY, AND A BLOCKER ASSEMBLY FOAR SAID SLIDE COMPRISING A CAM MEMBER MOUNTED IN SAID SPINDLE AND HAVING AN OBLIQUELY EXTENDING CAMWAY THEREON, A SECOND CAM MEMBER WITHIN SAID SPINDLE HAVING A CAM ELEMENT EXTENDING INTO CAMMING ENGAGEMENT WITH SAID CAMWAY, ONE OF SAID CAM MEMBERS BEING MOVABLY AXIALLY, ACTUATING MEANS EXTENDING THROUGH THE SPINDLE FROM THE OTHER OF SAID CAM MEMBERS TO THE EXTERIOR, AND A SINGLE BLOCKER IN OPERATING ENGAGEMENT WITH THE CAM MEMBER WHICH IS MOVABLE AXIALLY WHEREBY SAID BLOCKER IS SLIDABLE IN RESPONSE TO ACTUATION OF SAID CAM ELEMENTS BETWEEN BLOCKING AND UNBLOCKING POSITIONS, SAID RETRACTOR SLIDE HAVING A SHOULDER MEANS IN ALIGNMENT WITH THE BLOCKER WHEN THE RETRACTOR SLIDE IS IN WITHDRAW POSITION AND ENGAGEABLE WHEN THE BLOCKER IS ADVANCED TO BLOCKING POSITION WHEREBY THE RETRACTOR SLIDE IS WITHHELD IN SAID WITHDRAW POSITION.