Knockdown steel shelving and cabinet hardware therefor

Claim 1

IN COMBINATION, A STEEL SHELVING UNIT INCLUDING A PAIR OF VERTICAL FRONT CORNER POSTS HAVING TRIM FLANGES, UPPER AND LOWER VERTICALLY SPACED HORIZONTAL SHELVES SECURED AT THEIR FRONT CORNERS TO SAID CORNER POSTS, THE FRONT EDGES OF SAID SHELVES IN COMBINATION WITH SAID TRIM FLANGES OF THE CORNER POSTS DEFINING A RECTANGULAR FRONT ACCESS OPENING COMMUNICATING WITH THE INTERIOR OF THE SHELVING, A RECTANGULAR DOOR FRAME INCLUDING UPPER AND LOWER HORIZONTAL FRAME MEMBERS EXTENDING BETWEEN SAID CORNER POSTS AND VERTICAL SIDE FRAME MEMBERS EXTENDING BETWEEN THE TWO SHELVES AND HAVING INNER FLANGES ALONGSIDE SAID VERTICAL SIDE FRAME MEMBERS DISPOSED IN SUPPORTED RELATION BETWEEN SAID TRIM FLANGES AND FRONT EDGES OF SAID SHELVES, MEANS FOR SECURING THE UPPER HORIZONTAL FRAME MEMBER TO THE FRONT EDGE REGION OF THE UPPER SHELF, IN MUTUALLY SUPPORTED RELATIONSHIP, MEANS FOR SECURING THE LOWER HORIZONTAL FRAME MEMBER IN SUPPORTED RELATION TO THE FRONT EDGE REGION OF THE LOWER SHELF, SAID UPPER FRAME MEMBER PRESENTING A DOWNWARDLY FACING CHANNEL PORTION AND SAID LOWER FRAME MEMBER PRESENTING AN UPWARDLY FACING CHANNEL PORTION OPPOSED TO SAID DOWNWARDLY FACING CRADLE PORTION, AN ANTI-FRICTION GUIDE STRIP DISPOSED IN EACH CRADLE PORTION AND SUBSTANTIALLY COEXTENSIVE THEREWITH, EACH GUIDE STRIP BEING FORMED WITH A MEDIAL FLANGE THEREON DIVIDING ITS RESPECTIVE CRADLE PORTION INTO INNER AND OUTER CHANNELS, AN OUTER DOOR PANEL HAVING ITS UPPER AND LOWER EDGES SLIDABLE IN THE OUTER CHANNELS DEFINED BY SAID GUIDE STRIPS, AND AN INNER DOOR PANEL HAVING ITS UPPER AND LOWER EDGES SLIDABLE IN THE INNER CHANNELS DEFINED BY SAID GUIDE STRIPS.