Lockout mechanism for lock sets

Claim 1

IN A LOCK SET HAVING A LOCKING MECHANISM, THE COMBINATION OF: AN EXTERIOR KNOB; AN EXTERIOR SPINDLE CONNECTED TO SAID EXTERIOR KNOB; AN INTERIOR KNOB; AN INTERIOR SPINDLE CONNECTED TO SAID INTERIOR KNOB; A CYLINDER LOCK MOUNTED IN SAID EXTERIOR KNOB AND INCLUDING A HOUSING AND A PLUG ROTATABLE IN SAID HOUSING FOR UNLOCKING THE LOCKING MECHANISM OF THE LOCKSET, SAID PLUG INCLUDING A KEYWAY FOR RECEIVING A KEY TO ROTATE SAID PLUG; LOCKOUT MEANS OPERATIVE TO OBSTRUCT SAID KEYWAY AND INCLUDING A PUSH ROD, AN ACTUATING ELEMENT LOCATED IN SAID INTERIOR KNOB AND OPERATIVE TO AXIALLY MOVE SAID PUSH ROD TO RENDER SAID LOCKOUT MEANS OPERATIVE, AND BIAS MEANS TENDING TO AXIALLY MOVE SAID PUSH ROD TO RENDER SAID LOCKOUT MEANS INOPERATIVE; A LATCHING MECHANISM; FIRST DOGGING MEANS HAVING COOPERATING PORTIONS ON SAID LATCHING MECHANISM AND ON SAID PUSH ROD, RESPECTIVELY, SAID PORTIONS BEING ENGAGEABLE, UPON OPERATION OF SAID LOCKOUT MEANS, TO OVERCOME THE BIAS OF SAID BIAS MEANS AND MAINTAIN SAID PUSH ROD IN A POSITION RENDERING SAID LOCKOUT MEANS OPERATIVE; AND SECOND DOGGING MEANS HAVING COOPERATING PORTIONS, RESPECTIVELY, ON SAID PUSH ROD AND ON ONE OF SAID EXTERIOR AND INTERIOR SPINDLES, SAID PORTIONS OF SAID SECOND DOGGING MEANS BEING NORMALLY DISENGAGED TO PERMIT SAID BIAS MEANS TO AXIALLY MOVE SAID PUSH ROD, SAID PUSH ROD BEING ROTATABLE TO EFFECT ENGAGEMENT OF SAID PORTIONS OF SAID SECOND DOGGING MEANS TO PREVENT AXIAL MOVEMENT OF SAID PUSH ROD BY SAID BIAS MEANS.