| 摘要 |
<p>TITLE DOOR OPERATING MECHANISM INVENTOR Tebor MITRO A novel door mechanism for use with vertically movable doors, in one aspect; (a) eliminates the need for torsion springs, drums, and cables in the operator. This eliminates bird nesting and other ailments associated with that species of doors; and, (b) in vertical lift doors eliminates one of the many counter weights. This is achieved by use of a door moving control line which has flex in only one plane in eg. that the plane is orthogonal to the linear extent of the control line.</p> |
