Drive unit for door casement, has first energy storage device exerting torque on leaves in first wing opening angle region at specific angle, and second energy storage device exerting opening torque and closing torque on leaves

摘要

The drive unit has a damping device for attenuating closing and/or opening movements of a leaf. A first energy storage device is operatively connected with a closer axle (3) through a gear. A stroke cam (K1) is arranged on the closer axle and interacted with the first energy storage device. The first energy storage device exerts torque on leaves in a first wing opening angle region at an angular range between 0-30 degrees or 0-25 degrees. A second energy storage device exerts opening torque and closing torque on the leaves in a second wing opening angle region.