The advanced design of the operator features a small, self-contained unit composed of an electric motor with a built-in clutch and a reduction gear box, both housed in a die-cast aluminum casing. The motor drives the rack or chain to slide the gate. An adjustable friction clutch is located on the input side of the gear box so that when torque exceeds a preset value, the drive torque on the output shaft remains at a constant level. The holding power of the gear mechanism ensures that the gate stays perfectly shut. There is no need to fit an additional lock on the gate.
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