| 摘要 |
A spring balanced door for closing a passage through a door frame comprises a closure panel having opposite lateral edges and movable from a closed position to an open position, fixed supports connected to the door frame at opposite sides of the passage, a vertical guide track connected on opposite sides of the door frame and rollers rotatably mounted to the panel at each lateral edge thereof and adjacent a lower corner of each lateral edge, movable in each track respectively. Rigid arms are connected to the panel at intermediate locations of each lateral edge and extend perpendicularly to a plane of the panel from an interior surface of the panel. A lever arm is journaled between each rigid arm and each support, with each lever arm pivotally connected to each rigid arm at a joint. A spring is connected between at least one of the supports and a corresponding lever arm with a stop provided on the support against which the lever arm stops during movement of the panel from its closed to its opened position. When the lever arm engages the stop, the panel continues its motion to its opened position by rotating about the joint.
|
