A locking hinge assembly (32) has first and second hinge members (38, 40) having a respective hinge section (50, 51), proximate wall (46, 47) and mounting flange section (42, 43) for mounting on respective first and second panels (24, 26). The first and second hinge members are pivotably connected together at the hinge sections and are pivotably movable between a first position and a second position. The mounting flange section (42) has a channel (54) extending along the proximate wall section (48) for slidably receiving a locking member (56). The locking member (56) has at least one locking flange (60) extending through aligned apertures in the proximate walls. The locking flange has a hook section (62) at a distal end such that when the locking member slides to a locking position, the hook section engages a proximate wall to lock the hinge members in the first position.