A hub assembly for use in collapsible structures, said assembly having: a hub body (20) having a centre opening and a plurality of slots extending from the centre opening to a periphery of the hub body (20), a cover (22) disposable in the centre opening, a plurality of flexible members (24) having a plurality of first portions and a plurality of second portions, the first portion being disposed in the slots and a plurality of poles (26) coupled to the second portions of the flexible members (24) by a plurality of hinges (28), wherein the flexible members (24) are operable to move about a plurality of interface points (36) between the first portions and the second portions to rotate each of the poles having a constant rotating centre between a close position and an open position.