Abstract: Hardware for converting a door panel into a sliding door includes a pair of two-wheel trolley assemblies for supporting a door panel, a one piece track for attachment above a door opening, and a guide assembly for the bottom of the door panel for stabilizing the door when it is in the closed position. The track has running surfaces at 90.degree. to each other on which the wheels run. For use with doors for refrigerated rooms, one of the running surfaces has elevated portions for raising one wheel of each trolley. When on the elevated portions, the door panel is moved outwards from the door opening, thereby minimizing damage by the sliding panel to the door seals.

Abstract: The panel fastener includes an externally driven crank having a first pin slidably engaging a first cam surface formed on a hook member. A second pin fixed on said hook member slidably engages a second cam surface having a fixed position. Rotation of said crank on center axis induces cam action causing said hook member to first rotate and then retract. Thereby, the hook member when located on one panel can engage a pin fixed on an independent second panel and join and draw together said panels. Alignment of the pins and crank axis prevents loosening or disengagement of the joined panels without intentional reverse operation of the crank.

Abstract: A self-closing, non-rising hinge in cartridge form fits into a socket, generally, in the upper edge of a door. The hinge mechanism is completely enclosed within a housing and provides a strong returning force for closing a door. The hinge is reversible in that it can be mounted for opening the door either from the left or from the right. Where two doors are present, one above the other, as in refrigerators, the hinge may be inserted, in inverted position, into the lower edge of the door to minimize space requirements.

Abstract: A device for holding a door firmly closed includes a bracket for attachment to a door and a bistable assembly for attachment to the door jamb. A spring-biased piston within the bistable assembly presses one arm of a rotatable bell-crank against the tip of the bracket to hold the door firmly closed against the door jamb. Opening the door against the urging of the spring-biased piston rotates the bell crank to a standby position in which it is held stably by the spring-biased piston.In a preferred embodiment, a solenoid within the housing of the bistable assembly rotates the bell crank from engaged position to standby position in response to an external signal, thereby moving the door away from the door jamb automatically.