The RDBK type is based on the centrifugal lift-off RSCI freewheel spring high-speed backstop, which is also equipped with an integral non-positive torque limiter. The maximum torque to be transmitted is set at the factory according to customer requirements. This design is mostly used as backstops in multidrive systems, such as on large inclined conveyors, where they enable load balancing between the individual drives through torque limitation and offer effective protection against torque peaks.

The torque limiting function is performed through a multi-disc brake working in oil. This solution provides not only for a high torque density of the complete unit, but also ensures that the set slip torque remains constant over the working lifetime regardless of the environmental conditions.

The RDBK series sub-assembly which rotate backwards under overload is fully bearing supported. The unit is capable of performing as many reverse rotations as may be required to completely unload the conveyor prior to maintenance work being carried out. Within some time intervals, this type can rotate regularly backwards damage-free.

The option of a release function manually actuated is also available. A hydraulic solution is the preferred one, nevertheless, a full mechanical one can be supplied. The release is performed using a simple hand pump to actuate the internal hydraulic cylinder; progressively releasing the backstop. The backstop function is of the built-in design. The outer part must be centered and fixed on the machine housing. The run-out and squareness tolerances must be respected

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