Metal door jamb strike plate assemblies

Claim 1

IN A METAL DOOR FRAME OF THE CHARACTER IN WHICH A STRIKE PLATE JAMB SECTION IS SUPPORTED BY A ROUGH BUCK AND IS NORMALLY UNSECURED TO SAID ROUGH BUCK THROUGH ITS CENTER SPAN AND THE STRIKE PLATE JAMB SECTION HAS A HOLE TO RECEIVE THE LATCH OF A DOOR IN SAID FRAME, THE IMPROVEMENT COMPRISING A DUST BOX PROPORTIONAL TO FIT IN THE HOLE IN TTHE STRIKE PLATE JAMB SECTION AHD HAVING A PAIR OF OPPOSITELY DISPOSED FLANGES ADAPTED TO BEAR ON THE FACE OF THE JAMB SECTION ALONG THE MARGIN OF SAID HOLE, SAID DUST BOX HAVING A BOTTOM WITH A SCREW RECEIVING HOLE IN IT; A SCREW EXTENDING THROUGH SAID HOLE, SAID SCREW BEING OF A LENGTH TO SCREW INTO THE ROUGH BUCK AND HAVING A HEAD OF A SIZE TO ENGAGE THE WALL OF SAID BOTTOM AROUND THE MARGIN OF SAID HOLE, A SCREW HEAD HAVING A SCREWDRIVER RECEIVING RRECESS IN IT; CLAMPING MEANS MOUNTED WITHIN SAID DUST BOX, SAID CLAMPING MEANS HAVING A BOTTOM WEB WITH AN OPENING IN IT PROPORTIONED TO ADMIT A SCREWDRIVER BUT NOT TO ADMIT THE HEAD OF SAID SCREW, SAID HEAD BEING POSITIONED BETWEEN THE BOTTOM OF SAID DUST BOX AND THE BOTTOM WEB OF SAID CLAMMPING MEANS, WITH THE SCREWDRIVER RECEIVING RECESS OF SAID HEAD FRAMED WITHIN THE SAID OPENING AND MEANS FOR RETAINING SAID CLAMPING MEANS WITHIN SAID DUST BOX.