Overhead door
OwnerJacob H. Crawfordinventor
Life of this patent
Estimating the term…
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.
Claims10
An overhead door for selectively blocking an opening in a wall, the opening being defined in part by a first side edge and a second side edge, said door comprising:
- (a) first door means having a first side and a second side and having an opening therein, said opening in said first door means being defined by a first side edge and a second side edge;
- (b) first pivot means for pivotally mounting said first door means to the first and second side edge of the opening in the wall and for allowing said first door means to move between a substantially vertical closed position and a substantially horizontal opened position;
- (c) second door means having a first side and a second side;
- (d) second pivot means for pivotally mounting said second door means to said first and second side edges of said opening in said first door means and for allowing said second door means to move between a substantially vertical closed position and a substantially horizontal opened position;
- and
- (e) tracking means for causing said second door means to move from said closed position substantially completely to said horizontal position when said first door means initially begins movement from said closed position toward said opened position and to maintain said horizontal position until said first door means has reached said opened position.
Dependencies are inferred from the claim text.