Animal cage

Claim 1

A PORTABLE ANIMAL CAGE CAPABLE OF BEING MANUALLY HANDLED AND STACKED ON AND SEPARABLY CONNECTED TO CORRESPONDINGLY CONSTRUCTED COMPANION CAGES COMPRISING: A ONE-PIECE U-SHAPED BODY SECTION EMBODYING SPACED PARALLEL HORIZONTAL TOP AND BOTTOM WALLS JOINED TO EACH OTHER AT CORRESPONDING REARWARD ENDS BY AN INTERVENING VERTICAL BACK WALL, SAID TOP WALL HAVING SPACED PARALLEL UPSTANDING FLANGES ALONG MARGINAL SIDE EDGES THEREOF AND AN UPSTANDING FLANGE EXTENDING ACROSS THE FRONT MARGINAL EDGE, THE EDGE OF SAID FRONT FLANGE BEING DIRECTED REARWARDLY AND OVERLYING THE TOP WALL IN SPACED PARALLEL RELATION AND DEFINING A FIRST RIGIDIFYING MEMBER, SAID BOTTOM WALL HAVING DOWNBENT FLANGES ALONG ITS SIDE MARGINAL EDGES AND ALSO HAVING A DOWNBENT FLANGE ACROSS SAID FRONT MARGINAL EDGE THE FREE LENGTHWISE EDGE OF WHICH IS ALSO BENT REARWARDLY AND DISPOSED IN SPACED PARALLEL RELATION TO SAID BOTTOM WALL TO DEFINE A SECOND RIGIDIFYING MEMBER, SAID BACK WALL HAVING REARWARDLY DIRECTED LATERAL REINFORCING FLANGES, A PAIR OF OPPOSITELY DISPOSED VERTICALLY POSITIONED SIDE WALLS SPANNING THE RESPECTIVE OPEN END PORTION OF THE U-SHAPED BODY SECTION AND HAVING SURFACES THEREOF ABUTTING THE COOPERATING FLANGES ON THE TOP, BOTTOM AND BACK WALLS, EACH SIDE WALL HAVING LATERAL INWARDLY BENT FLANGES AT UPPER AND LOWER MARGINAL EDGES THEREOF AND SAID FLANGES OVERLYING AND PROJECTING BEYOND THE COOPERATING SIDE FLANGES OF THE TOP AND BOTTOM WALLS AND BEING SPACED FROM THE EXTERIOR SURFACES OF THE RESPECTIVE TOP AND BOTTOM WALLS AND COACTING IN PROVIDING ADDITIONAL RIGIDFYING MEMBERS, SAID THUS ASSOCIATED AND CONNECTED WALLS PROVIDING AN OPEN FRONT ANIMAL CAGE, AND AN OPENWORK DOOR OPERATIVELY MOUNTED ON AT LEAST ONE OF SAID WALLS, CLOSING SAID OPEN FRONT AND PROVIDED WITH MANUALLY ACTUABLE FASTENING MEANS.