Compact casing head and hanger

Claim 1

IN A WELL HEAD ASSEMBLY: A COMPACT UNITARY HEAD FOR RECEIVING HANGERS AND ASSOCIATED STRINGS OF PIPE, SAID HEAD INCLUDINGA A UNITARY BODY MEMBER HAVING A VERTICAL BORE THROUGH, SAID BORE DEFINING AN UPPER ANNULAR TAPERED SEAT AND A LOWER ANNULAR TAPERED SEAT CONCENTRIC WITH SAID DISPOSED BELOW SAID UPPER SEAT, SAID UPPER SEAT FACING MORE TOWARD THE VERTICAL THAN SAID LOWER SEAT; A HANGER MEMBER IN ENGAGEMENT WITH ANS SUPPORTED ON SAID UPPER AND LOWER SEATS, SAID HANGER MEMBER INCLUDING A UNITARY TUBULAR BODY HAVING A LOWER PORTION, AN UPWARDLY EXTENDING ANNULAR EXTENSION AND MEANS ASSOCIATED WITH SAID LOWER PORTION FOR SUSPENDING A STRING OF CASING THEREFROM, SAID EXTENSION HAVING A DOWNWARDLY FACING ANNULAR SHOULDER IN MATING ENGAGEMENT WITH SAID UPPER SEAT AND SAID LOWER PORTION HAVING A DOWNWARDLY FACING ANNULAR SHOULDER IN MATING ENGAGEMENT WITH SAID LOWER SEAT, THE RELATIVE VERTICAL DISTANCES BETWEEN SAID SHOULDERS AND BETWEEN SAID SEATS BEING SUCH THAT THE SHOULDER ON SAID EXTENSION ENGAGES SAID UPPER SEAT BEFORE THE SHOULDER ON SAID LOWER PORTION ENGAGES SAID LOWER SEAT WHEN SAID HANGER MEMBER IS LOWERED INTO SAID HEAD, SAID EXTENSION BEING OF RADIALLY DEFLECTABLE CONSTRUCTION RELATIVE TO SAID LOWER PORTION AND, IN THE FINAL POSITION OF SAID HANGER MEMBER, BEING DEFLECTED RADIALLY INWARDLY FROM ITS UNDEFLECTED POSITION BY ENGAGEMENT WITH SAID UPPER SEAT WHEREBY THE WEIGHT OF A CASING STRING SUSPENDED BY SAID SUSPENDING MEANS WILL BE SUPPORTED PARTIALLY BY SAID UPPER SEAT AND PARTIALLY BY SAID LOWER SEAT.