Mortise lock knob locking means

Claim 1

IN A MORTISE TYPE LOCK INCLUDING A CASE, A LATCH BOLT RECIPROCATABLY MOUNTED IN SAID CASE, HAND-HOLD MEANS OPERATIVELY MOUNTED IN SAID CASE INCLUDING A ROLLBACK, AN OPERATING CONNECTION BETWEEN SAID ROOLBACK AND SAID LATCH BOLT, AN INTERLOCK FOR BLOCKING ROTATION OF SAID ROLLBACK, A TURN DEVICE IN OPERATIVE ENGAGEMENT WITH SAID INTERLOCK, SAID INTERLOCK INCLUDING SLIDE MEANS SLIDABLY MOUNTED, SAID SLIDE MEANS INCLUDING A BLOCKING SLIDE MEMBER AND A RECIPROCATING DRIVING SLIDE MEMBER, SAID DRIVING SLIDE MEMBER HAVING A SLIDABLE MOUNTING ON THE CASE, OPPOSITELY FACING CAMS ON RESPECTIVELY OPPOSITE EDGES OF SAID DRIVING SLIDE MEMBER SLOPING IN A DIRECTION OBLIQUE RELATIVE TO THE DIRECTION OF MOVEMENT OF SAID DRIVING SLIDE MEMBER, SAID CAMS BEING IN SLIDING ENGAGEMENT WITH RESPECTIVE ADJACENT CAMS ON SAID BLOCKING SLIDE MEMBER FOR RECIPROCATABLY DRIVING THE BLOCKING SLIDE MEMBER, SAID ROLLBACK HAVING A SLOT THEREIN IN LINE WITH SAID BLOCKING SLIDE MEMBER WHEN THE ROLLBACK IS IN THE POSITION OCCUPIED WHEN THE LATCH BOLT IS EXTENDED, SAID SLOT BEING ADAPTED TO RECEIVE SAID BLOCKING SLIDE MEMBER IN LOCKED POSITION, WHEREBY SAID ROLLBACK IS BLOCKED BY OPERATION OF SAID TURN DEVICE.