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Rack and Pinion Gates
A rack and pinion gate consists of a gate frame, blade, rack(s), pinion gear(s), pinion shaft, shaft bearings and a manual or powered shaft drive. Some larger manual drives may incorporate v-belts and/or gear boxes for mechanical advantage. Most powered rack and pinion gates will incorporate some type of mechanical advantage between the driver and pinion shaft.
Due to their limited actuating speed, rack and pinion gates are rarely used to regulate flow into a process or onto a conveyor; however, they are sometimes used to discharge small hoppers that always discharge completely. For example, a rock bin that has a maximum capacity of one truckload may use a rack and pinion gate to shut off flow when a truck is not being loaded.