Sheet material rack

Claim 1

A RACK STRUCTURE COMPRISING, IN COMBINATION, A HOUSING HAVING AN OPEN FRONT AND CLOSURE MEANS THEREFOR PERMITTING ACCESS TO BE HAD TO THE INTERIOR OF THE HOUSING, A PAIR OF UPPER AND LOWER ALIGNED BRACKETS MOUNTED IN SAID HOUSING AND SECURED TO ONE WALL THEREOF ONE ABOVE THE OTHER, A VERTICAL SUPPORT MEMBER FIXED BETWEEN THE RESPECTIVE BRACKETS AND CIRCULAR IN CROSS-SECTION, AT LEAST ONE SLEEVE MOUNTED FOR FREE TURNING MOVEMENT ON SAID SUPPORT MEMBER, A SUPPORT ARM SUBSTANTIALLY L-SHAPED IN PLAN AND EMBODYING LONG AND SHORT LIMBS, THE SHORT LIMB HAVING AN END THEREOF ATTACHED TO AND EXTENDING RADIALLY FROM SAID SLEEVE, THE LONG LIMB BEING SUPPORTED IN A HORIZONTAL PLANE AT RIGHT ANGLES TO THE LENGTHWISE AXIS OF SAID SUPPORT MEMBER, AN ELONGATED MEMBER SUBSTANTIALLY CHANNEL-SHAPED IN CROSS-SECTION AND OPPOSED TO AND GENERALLY PARALLEL WITH SAID LONG LIMB OF SAID SUPPORT ARM AND PROVIDED WITH CLIPS DETACHABLY AND ADJUSTABLY MOUNTED ON SAID LONG LIMB, SAID CHANNEL BEING ADAPTED FOR RECEPTION OF A STACK OF BLUEPRINTS OR THE LIKE, AT LEAST A PAIR OF WEDGE-SHAPED BLOCKS FITTING INTO THE CHANNEL PORTION OF SAID CHANNEL MEMBER AND DETACHABLY AND ADJUSTABLY BOLTED IN PLACE THEREIN IN A MANNER TO COOPERATIVELY ENGAGE AND RETAIN COACTING EDGE PORTIONS OF THE BLUEPRINTS IN SAID CHANNEL.