Convertible storage rack

Claim 1

IN A WAREHOUSE STORAGE RACK THE COMBINATION OF: A VERTICAL POST; AN INVERTIBLE HORIZONTAL SHELF BEAM HAVING A CROSSSECTIONAL SHAPE WHEN IN FIXED LOAD-SUPPORTING POSITION SUBSTANTIALLY RESEMBLING THE LETTER T IN RECUMBENT POSTURE LYING ON ONE SIDE AND COMPRISING AN ELONGATED BODY PORTION OF RECTANGULARY CROSS-SECTION FORMING THE CROSS-ARMS OF THE T AND HAVING A PAIR OF FLAT FACES LAYING IN PARALLEL HORIZONTAL PLANES AND ADAPTED TO BE INVERTED SELECTIVELY INTO UPWARDLY PRESENTED LOAD-SUPPORTING POSITIONS; A LONGITUDINAL RIB PORTION PROJECTING AT RIGHT-ANGLES TO ONE SIDE OF SAID BODY PORTION IN VERTICALLY SPACED RELATION TO SAID LOAD-SUPPORTING FACES OF THE LATTER TO FORM THE STEM OF THE T IN A MANNER TO PROVIDE A PAIR OF FLAT FACES LYING IN HORIZONTAL PLANES AND ADAPTED TO BE UPWARDLY PRESENTED SELECTIVELY WITH CORRESPONDING LOAD-SUPPORTING FACES OF THE UPPER BODY PORTION TO CONSTITUTE DECKING-SUPPORTING FACES WITH VERTICAL CO-PLANAR LIMITING FACES OF THE BODY PORTION ABOVE AND BELOW SAID DECKING-SUPPORTING FACES FOR EDGE-WISE ABUTMENT BY THE DECKING; AND MEANS PROVIDED ON SAID PORT AND SHELF BEAM TO SUPPORT ONE END OF THE LATTER OR THE FORMER IN A SELECTED FIXED OPERATIVE POSITION; THE RIB PORTION OF THE SHELF BEAM BEING UNEQUALLY SPACED FROM THE RESPECTIVE LOAD-SUPPORTING FACES OF THE BODY PORTION THEREOF IN SUCH A MANNER THAT DECKING OF DIFFERENT THICKNESS MAY BE SELECTIVELY SUPPORTED BY SAID RIB PORTION FLUSH WITH THE CORRESPONDING UPWARDLY PRESENTED LOAD-SUPPORTING FACE OF SAID BODY PORTION.