The Mechanical Handling and Storing of Material

COAL TIPS OR HOISTS 571 fitted tooth racks into which the two pawls of the shoot are geared, so as to relieve the ropes of the tension until the shoot is to be raised or lowered again. No power is required to lower the shoot, as its own weight is always sufficient to turn the winch as soon as the brake has been released. 5. Winch for Lifting or Lowering the Anti-Breakage Crane.—This is illustrated Figs. 810 and 811. Winch for the Anti-Breakage Crane. in Figs. 810 and 811. The crane itself is fitted to the frame of the tip in the usual manner, and the winch will lift the weight on the crane at the rate of 2 ft. per second. The connection between the winch and anti-breakage crane, by means of wire ropes, may be seen from Figs. 812 and 813, which explain themselves. The winch is driven by an 18 H.P electro-motor, which runs at a speed of 630 revs, per minute, and the bra e is similar to those previously described. Figs. 812 and 813. Rope Connection between Winch and Crane. 6. Winch for Turning the Anti-Breakage Crane.—This is illustrated in Figs. 8 and 815. The motor is connected to the turning gear by worm and worm wheel, and a pair of spur wheels. The whole apparatus is so small and is so seldom used that the operator’s cabin was undoubtedly the most suitable place foi it. The motor is o ’ making 1,000 revs.