Adjustable height bed

Claim 1

AN ADJUSTABLE HEIGHT BED COMPRISING A RECTANGULAR FRAME HAVING FOUR CORNER LEG ASSEMBLIES, EACH LEG CONSISTING OF AN UPPER SECTION RIGIDLY SECURED TO THE BED FRAME, A LOWER MAIN SECTION IN SAID LEG ASSEMBLY, HINGE MEANS CONNECTING SAID LOWER MAIN SECTION TO SAID UPPER SECTION ENABLING SAID LOWER MAIN SECTION TO SWING IN BENEATH SAID FRAME, AN EXTENSIBLE SUPPLEMENTAL LOWER LEG MEMBER SLIDABLY MOUNTED IN SAID UPPER SECTION AND STRADDLED BY SAID LOWER MAIN SECTION WHEN SAID LOWER MAIN SECTION IS IN VERTICAL POSITION, A SPRING CARRIED IN SAID UPPER SECTION AND IN SAID EXTENSIBLE LOWER MEMBER URGING SAID EXTENSIBLE LOWER MEMBER RELATIVELY DOWNWARDLY WITH RESPECT TO SAID UPPER SECTION, A FREELY SWIVELING CASTER ON THE BOTTOM OF SAID EXTENSIBLE LOWER MEMBER, A GROUNDENGAGING WHEEL CARRIED BY SAID LOWER MAIN SECTION, COOPERATING LIFTING MEANS FOR SAID LOWER MAIN SECTION CARRIED BY SAID EXTENSIBLE LOWER MEMBER AND SAID LOWER MAIN SECTION SO ARRANGED AND POSITIONED THAT WHEN SAID LOWER MAIN SECTION IS SWUNG INTO VERTICAL POSITION SAID LOWER MAIN SECTION WILL RIDE ON AND BE SUPPORTED BY SAID EXTENSIBLE LOWER MEMBER AND SAID WHEEL WILL BE RAISED OFF THE FLOOR, MEANS LIMITING THE SLIDING OF SAID EXTENSIBLE LOWER MEMBER IN SAID UPPER SECTION, AND MEANS FOR SWINGING THE LOWER MAIN SECTIONS OF THE FOUR LEG ASSEMBLIES IN UNISON BETWEEN VERTICAL POSITION AND RETRACTED POSITION EXTENDING BENEATH SAID FRAME.