• 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.

Fig. 14.24. Rolling gate.

  • 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.