Abstract: A hinge movable between an extended position and a collapsed position via a hyper-extended position comprising a primary member, a secondary member and a coupling between the members, the coupling movable between a rotating position and a locking position and comprising: a pin connected to the secondary member; a retainer formed in the primary member in which the pin is retained, the primary member being rotatable about the pin and the pin being movable along at least a portion of the length of the retainer; a first arm connected to the primary member for acting against movement of the primary member relative to the pin in a first direction along the length of the retainer; and a second arm connected to the primary member for acting against movement of the primary member relative to the pin in a second direction along the length of the retainer.