ROLLING GATE This grate is show in Fig. 14.24. It consists of a steel cylinder as large in diameter as the height of the opening and spanning between the piers. Each pier has an inclined rack. The gate is wound around the periphery of the cylinder. The gate is also attach to the incline rack with the help of toothed gears. ItGate can be roll while opening and unroll which closing the gate.
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