Parking meter mechanism

Claim 1

IN COMBINATION WITH A COIN COMPARTRMENT OF A PARKING METER, A DOOR OPENING INTO SAID COMPARTMENT, SAID DOOR HAVINGA BORE THERETHROUGH WITH THE BORE HAVING AN OUTER PORTION, A CYLINDER LOCK HAVING A BARREL AND A PLUG MOUNTED ON THE INNER SIDE OF SAID DOOR, SAID BARREL HAVINGA DIAMETER GREATER THAN THE DIAMETER OF THE OUTER BORE PORTION WITH THE FRONT EDGE PORTION OF THE BARREL OF THE LOCK BEARING AGAINST THE AREA SURROUNDING THE INER END OF THE OUTER BORE PORTION, SAID AREA BEING DEFINED BY THE DIFFERENT DIAMETERS OF SAID OUTER BORE PORTION AND SAID BARREL, SAID PLUG HAVING A KEYWAY TO BE OPERATED BY A KEY INSERTED THROUGH THE OUTER PORTION OF SAID OUTER BORE PORTION, A TUBULAR GUARD COAXIALLY FIXED IN AND LKINING THE OUTER BORE PORTION, SAID TUBULAR GUARD HAVING A HARD METAL INNER SURFACE FOR RESISTING TAPPING THEREOF, THE A GUARD MEMBER FREELY ROTATABLY DISPOSED BETWEEN THE PLUG OF SAID LOCK AND SAID TUBULAR GUARD FOR ROTATION WHEN ENGAGED BY A CUTTING TOOL SUCH AS A DRILL BIT TO PREVENT PASSAGE OF THE TOOL THERETHROUGH, SAID GUARD MEMBER HAVING AN OPENING THERETHROUGH SELECTIVELY ALIGNABLE WITH SAID KEYWAY FOR THE PASSAGE OF THE KEY INTO SAID KEYWAY.