Door assembly for a temperature controlled storage structure

Details Door assembly for a temperature controlled storage structure Door assembly for a temperature controlled storage structure

1993-06-07

1995-04-04

Johnson, Blair M.

Flexible or portable closure, partition, or panel

Plural strip, slat, or panel type

With mounting or supporting means

160209, E05D 1506

Patent

active

054028418

ABSTRACT:
An overhead door assembly is disclosed having a pair of rails each with upright and horizontal segments. Pivot supports at the lower ends of the upright segments permit the rails and a door thereon to move into and out of the doorway of a temperature controlled storage structure. A control shaft imparts movement to the rails by arm assemblies each including pivotally coupled arms to tilt the rail segments and door thereon between open and closed positions. The door is held in a closed position by an over-center relationship in each arm assembly. The control shaft is manually actuated while modified rail positioning arrangement includes a pneumatic cylinder and a valve control for rail positioning. Seals about the door and between panels of the door render the storage structure airtight.

REFERENCES:
patent: 2045060 (1936-06-01), Wheatley
patent: 2069665 (1937-02-01), Bouthillier
patent: 3507322 (1970-04-01), Tetrick et al.
patent: 4350199 (1982-09-01), Pino
patent: 4509383 (1986-02-01), Wentzel
patent: 4901538 (1990-02-01), Anthony

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