Patent ID: 11898389
Assignee: nan
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 10:
11. A method of closing a door opening of a building, comprising:
a. providing a door having a vertical closed position and being movable in an opening cycle to a generally horizontal open position and being movable in a closing cycle from the open position to the closed position;
b. providing a door frame including at least top and bottom horizontal members, at least left and right vertical side members each connected to the top and bottom horizontal members at opposite ends of the top and bottom horizontal members and a barrier fixed to said door frame;
c. each of the left and right vertical side members includes a pivot point positioned between the top and bottom horizontal members of said door frame, said pivot points engaged with an actuation mechanism which when powered raises or lowers said pivot points;
d. providing first and second cams, each mounted to a respective one of the vertical side members of said door frame, a lower end of each of said cams is affixed to the respective one of the vertical side members at a position at or slightly above a point approximately half-way down the respective one of the vertical side members when the door is in the closed position, and each said cam extending from the lower end thereof upwardly and arcuately toward an interior of the building to a distal upper terminal end of said cam when the door is in the closed position, said distal upper terminal end of each of said first and second cams contacts a cam follower when the door is in the closed position, said cam followers extend toward each other approximately at a right angle with respect to said vertical side members and parallel to the top horizontal member, wherein as the door moves between the closed position and the open position, said cam followers slide along the first and second cams and guide the first and second cams and the door; and
e. said actuation mechanism, when powered, causes each said pivot point to move, thereby causing the door to move between the open and closed positions.