Overhead door

Details Overhead door Overhead door

1981-09-04

1983-08-09

Downey, Kenneth

Movable or removable closures

Combined

49197, 49114, E06B 700

Patent

active

043971156

ABSTRACT:
An overhead door for use in selectively blocking large openings such as aircraft hangar doors, warehouse doors, etc. The door includes a primary or main door member pivotally mounted to the door opening and one or more secondary door members pivotally mounted within the main door member. A tracking mechanism causes the secondary door members to move to a substantially horizontal opened position when the main door member initially begins movement toward a substantially horizontal opened position and to maintain this horizontal position throughout the opening cycle of main door thus providing minimum wind resistance as the door is opened.

REFERENCES:
patent: 1947691 (1934-02-01), Baldwin et al.
patent: 2433583 (1947-12-01), Thurman
patent: 2689766 (1954-09-01), Blackman
patent: 2748855 (1956-06-01), Siems et al.
patent: 3953940 (1976-05-01), Zaslow

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