Drawer rail structure

Claim 1

A DRAWER RAIL ASSEMBLY INCLUDING A DRAWER RAIL, A CASE RAIL, AND AN INTERMEDIATE RAIL; SAID CASE RAIL AND DRAWER RAIL BOTH BEING OPEN SIDED CHANNEL ELEMENTS HAVING AN INNER TRACK SPACE, AND HAVING WHEEL RETENTION FLANGE MEANS AT THE OPEN SIDES DEFINING AN ELONGATED RECEIVING OPENING AT SAID OPEN SIDES; SAID INTERMEDIATE RAIL ELEMENT BEING SHAPED IN CROSS SECTION LIKE A Z ON ITS SIDE HAVING EACH OF ITS CONNECTED LEGS GENERALLY NORMAL TO THE ADJACENT LEG, AND HAVING A PLURALITY OF VERTICAL WHEEL TYPE ROLLERS ROTATABLY MOUNTED THERETO ON OPPOSITE SIDES OF THE CROSS MEMBER OF SAID INTERMEDIATE ELEMENT TO COMPRISE UPPER ROLLERS AND LOWER ROLLERS; FIXED STOP MEANS BETWEEN SAID CASE RAIL AND SAID INTERMEDIATE RAIL TO LIMIT RELATIVE EXTENSION THEREBETWEEN; THE HEIGHT OF SAID CASE RAIL TRACK SPACE BEING GREATER THAN THE DIAMETER OF SAID WHEELS, AND THE HEIGHT OF SAID OPENING BEING LESS THAN THE DIAMETER OF SAID WHEELS; THE VERTICAL HEIGHT BETWEEN THE TOP OF SAID TRACK SPACE AND THE BOTTOM EDGE OF SAID OPENING BEING GREATER THAN THE WHEEL DIAMETER, AND THE VERTICAL DISTANCE FROM THE BOTTOM OF SAID TRACK SPACE TO THE TOP OF SAID OPENING BEING LESS THAN THE WHEEL DIAMETER; WHEREBY SAID UPPER ROLLERS ARE INSERTABLE LATERALLY INTO SAID CASE RAIL BY TILTING THE TOP EDGE OF SAID INTERMEDIATE RAIL TOWARD SAID CASE RAIL TO INSERT SAID UPPER ROLLERS, AND THEN TIPPING SAID INTERMEDIATE RAIL BACK TO THE VERTICAL POSITION TO INSERT THE ENTIRE UPPER ROLLERS.