Chair construction

Claim 1

A CHAIR ASSEMBLY COMPRISING: A LEG SUB-ASSEMBLY INCLUDING TWO SUBSTANTIALLY TUBULAR U-SHAPED MEMBERS, EACH HAVING TWO DISTAL LEG PORTIONS AND A SUBSTANTIALLY RECTILINEAR MEDIAL CROSS-PORTION, SAID MEMBERS BEING FIXEDLY INTERFITTED SO THAT SAID MEDIAL CROSS-PORTIONS INTERSECT EACH OTHER AND SAID LEG PORTIONS ARE COTEXTENSIVE; A SEAT HAVING A CONVEX-UPWARD UNDERSURFACE AND A SOCKET PORTION EXTENDING DOWNWARDLY FROM SAID UNDERSURFACE, SAID SOCKET PORTION INCLUDING A PLURALITY OF PAIRS OF DOWNWARDLY EXTENDING LONGITUDINAL WALLS, EACH OF SAID PAIRS OF LONGITUDINAL WALLS BEING SPACED APART BY A DISTANCE SUBSTANTIALLY EQUAL TO THE OUTER DIAMETER OF SAID MEDIAL CROSS-PORTION OF SAID LEG SUB-ASSEMBLY AND ADAPTED TO RECEIVE A SUB-PORTION OF ONE OF SAID LEG MEDIAL CROSSPORTIONS THEREBETWEEN, AND A PLURALITY OF DOWNWARDLY EXTENDING TRANSVERSE WALLS DISPOSED BETWEEN AND EXTENDING FROM EACH OF SAID PAIRS OF LONGITUDINAL WALLS AND EACH HAVING A CONCAVE-UPWARD LOWER SURFACE ADAPTED TO MATE WITH AN UPPER SURFACE OF THE SUB-PORTION OF SAID LEG MEDIAL CROSS-PORTION DISPOSED BETWEEN THE ADJACENT PAIR OF LONGITUDINAL WALLS; AND A RETAINING PLATE DISPOSED BELOW SAID SEAT SOCKET PORTION HAVING CONCAVE-DOWNWARD GROOVES THEREIN WHICH ARE COMPLEMENTARY TO SAID SOCKET PORTION PAIR OF LONGITUDINAL WALLS, SAID GROOVES BEING SUBSTANTIALLY EQUAL IN WIDTH TO THE OUTER DIAMETER OF SAID MEDIAL CROSS-PORTIONS OF SAID LEG SUB-ASSEMBLY AND ADAPTED TO RECEIVE A SUB-PORTION OF ONE OF SAID LEG MEDIAL CROSS-PORTIONS THEREIN; SAID RETAINING PLATE BEING FIXED TO SAID SEAT SOCKET PORTION, WITH SAID LEG MEDIAL CROSS-PORTIONS BEING CAPTURED THEREBETWEEN, PARTIALLY IN SAID GROOVES OF SAID RETAINING PLATE AND PARTIALLY IN SAID CONCAVE-UPWARD LOWER SURFACES OF SAID SOCKET TRANSVERSE WALLS, SAID RETAINING PLATE ALSO HAVING AN UPWARDLY EXTENDING PERIPHERAL FLANGE PORTION, ENCLOSING SAID SOCKET PORTION, AND HAVING APERTURES THEREIN FOR THE PASSAGE THERETHROUGH OF SAID LEG MEMBERS.