The combination of a special 180V DC motor and lever system represents a simple drive with high reliability. This drive system permits fast opening and closing times without bouncing of the boom in end positions. The special lever system ensures that the boom is locked in both end positions. For boom lengths of over 3 metres, a counterweight balancing spring is used. In the event of a power failure, however, it can be easily operated manually. The complete drive system is installed on a metal base frame and can be detached easily by removing 4 bolts. The boom weight is exactly balanced by means of a counterweight spring.
Adjustment to the appropriate boom length is carried out in the factory prior to delivery.