Display apparatus and system

Claim 1

IN A DISPLAY SYSTEM, A PLURALITY OF FRAME PARTS, MEANS REMOVABLY SECURED THE FRAME PARTS INTO A UNITARY ASSEMBLY, A PLURALITY OF DISPLAY PLATFORMS MOUNTED UPON THE FRAME PARTS, AT LEANST ONE OF THE FRAME PARTS BEING IN THE FORM OF AN H-FRAME, THE H-FRAME BEING COMPRISED OF A PAIR OF SPACED PARALLEL TUBULAR MEMBERS, THE TUBULAR MEMBERS HAVING HOLES INTERMEDIATE THE ENDS THEREOF, A LOCK ROD EXTENDING THROUGH THE HOLES IN THE TUBULAR MEMBER, A CROSS TUBULAR MEMBER MOUNTED COAXUALLY ON THE LOCK ROD AND ADAPTED TO HAVE ITS END ENGAGE THE SPACED PARALLEL MEMBERS, AND LOCKING MEANS DISPOSED WITHING THE SPACED PARALLEL MEMBERS AND ENGAGING THE LOCK ROD TO LOCK THE SPACED PARALLEL MEMBERS AND THE CROSS MEMBER INTO A UNITARY RIGID H-FRAME, SAID LOCK ROD BEING PROVIDED WITH CUT-OUT PORTIONS FORMING SURFACE WHICH ARE INCLINED WITH RESPECT TO THE SPACED PARALLEL MEMBERS, THE LOCKING MEANS CONSISTING THE LOCK MEMBERS, THE LOCK MEMBERS BEING FORMED WITH ELONGATED SLOTS HAVING INCLINED FACES ON OPPOSITE SIDES OF THE SLOT AND ENGAGING THE INCLINED SURFACES OF THE LOCK ROD AND MEANS MOUNTED IN THE LOCK MEMBERS AND ENGAGING THE LOCK ROD FOR RETAINING THE LOCK MEMBERS ON THE LOCK ROD IN A PREDETERMINED POSITION TO LOCK THE LOCK ROD INTO SAID FIRST AND SECOND FRAME MEMBERS.