1. A HINGE BRACKET FOR PIVOTALLY CONNECTING TUBE, ROD AND LIKE MEMBERS FOR RELATIVE SWINGING MOVEMENT WITH RESPECT TO ONE ANOTHER COMPRISING: AN ELONGATED BODY PORTION HAVING GENERALLY U-SECTION AND ADAPTED TO RECEIVE AND PARTIALLY ENCLOSE THE UPPER END PORTION OF ONE SAID MEMBER AND SIDE WINGS EXTENDING FORWARDLY-UPWARDLY FROM SAID BODY PORTION AND TERMINATING AT THEIR UPPER ENDS IN EAR FORMATIONS WHICH ARE SPACED APART AN AMOUNT ENABLING THE RECEPTION OF THE OTHER OF SAID MEMBERS THEREBETWEEN; MEANS FOR FIXEDLY SECURING SAID BODY PORTION TO THE UPPER END PORTION OF SAID ONE MEMBER AND IN POSITION SUCH THAT THE RELATIVELY TOP EDGE PORTIONS OF EACH ARE SUBSTANTIALLY AT THE SAME LEVEL; SAID EAR FORMATIONS HAVING ALIGNED HOLES FOR THE RECEPTION OF A PIVOT PIN WHICH IS ADAPTED TO BE PASSED CROSS-WISE THROUGH SAME AND THROUGH SAID OTHER MEMBER RECEIVED THEREBETWEEN; AND SAID TOP EDGE OF THE BODY PORTION OF THE BRACKET HAVING AN INTEGRAL, INWARDLY PROJECTING TAB WHICH IS ADAPTED TO EXTEND OVER THE TOP EDGE OF SAID ONE MEMBER TO LIMIT VERTICAL EXTENSION OF SAID ONE MEMBER WHEN RECEIVED IN THE BRACKET AND WHOSE RELATIVELY UPPER SURFACE IS SHAPED TO CONFORM TO THE RELATIVELY UNDER SURFACE OF SAID OTHER MEMBER RECEIVED BETWEEN SAID EAR FORMATIONS, SAID EAR FORMATIONS BEING PROVIDED WITH INWARD DEPRESSIONS SO LOCATED ALONG CORRESPONDING EDGES THEREOF THAT THEY MOVE OVER-CENTER OF THE ALIGNED HOLES PROVIDED IN SAID FORMATIONS WHEN SAID BRACKET IS SWUNG WITH SAID ONE MEMBER TO A POSITION IN WHICH SAID ONE AND OTHER MEMBERS ARE SUBSTANTIALLY PARALLEL.