Latch mechanism for die block of punch press

Claim 1

A PUNCH AND DIE MECHANISM COMPRISING A PUNCH RECIPROCATORY UP AND DOWN, A DIE FORMED WITH A PASSAGE ACCOMMODATING THE PUNCH AND ADAPTED FOR SHEARING COACTION WITH THE PUNCH, A RETAINER HAVING A SOCKET WHEREIN THE DIE IS REMOVABLY RECEIVED, THE PERIPHERAL FACE ON THE SOCKET HAVING A RECESS FROMED IN THE PERIPHERAL FACE OF THE SOCKET, A PLUNGER SLIDABLE IN SUBSTANTIALLY UP AND DOWN TRAVEL IN THE DIE AT ONE SIDE OF SAID PASSAGE, A BOLT SLIDABLE IN THE DIE TO HAVE RELEASABLE ENGAGEMENT IN SAID RECESS TO RESIST WITHDRAWAL OF SAID DIE FROM SAID SOCKET, THE PLUNGER AND BOLT HAVING INTERENGAGEABLE CAM FACES, RETRACTABLE DRIVE MEANS TO ACTUATE THE PLUNGER IN DOWNWARD SLIDING TRAVEL WHEREBY SAID CAM FACES URGE SAID BOLT INTO SAID RELEASABLE ENGAGEMENT, MEANS YIELDABLE URGING SAID PLUNGER IN UPWARD TRAVEL RESPONSIVE TO RETRACTION OF SAID DRIVE MEANS, AND MEANS TO URGE SAID BOLT TO SLIDABLY DISENGAGE FROM SAID RECESS CONSEQUENT TO SAID UPWARD TRAVEL TO AFFORD WITHDRAWAL OF SAID DIE FROM SAID SOCKET.