Türanordnung mit Drehstabfederausgleich

摘要

A counterbalanced door assembly particularly suited for heavy-duty load bearing applications such as sidewall access doors, and for precasting into concrete slabs, comprises a door (12), a frame (20) surrounding the door (12), a hinge connecting the door to the frame for rotation about a first axis (22), a torque rod arm (42) mounted to rotate about a second axis (50) displaced from the first axis (22), and one or more torque rods (38, 40). One end of the torque rod arm (42) is connected to the torque rod (40) to twist the torque rod as the torque rod arm (42) rotates about the second axis (50) thereby generating a counterbalance force. A force control mechanism, which may be a cam (48) with a properly shaped cam surface or a link (86) hinged at either end, receives the counterbalance force from the torque rod arm (42) and applies it in a controlled direction over a controlled effective moment arm relative to the first axis (22) to generate the desired counterbalance torque. The door assembly has a height, when the door is closed, no greater than the height of the frame (20), so that the door assembly is suitable for use as a flush-mounted sidewalk or floor access door and for precasting the door assembly into a concrete slab.