With convertible greenhouses, a Venlo greenhouse cover is opened by a shaft where the cover hinges on the gutter. Because of the high surface area, the load is high. In cases of rain and/or wind, these systems need to be closed rapidly. Fast drives are necessary for these situations, these drives are to be self-locking in all cases.
Huima Specials produces special tooth-racks locking drives that are particularly designed for convertible greenhouses, to close and open the covers in a fast and controlled manner.