The Mechanical Handling and Storing of Material

CHAPTER XVI TIGHTENING AND EQUALISING GEARS FOR ELEVATORS AND CONVEYORS TIGHTENING GEARS The same sort of tightening gears can be used for a variety of elevators and conveyors. Those shown in Figs. 3 to 6, page 12, are also suitable for small conveyors, but the adjust- ment will not allow of great lati- tude. The tightening gear shown in Fig. 256 is more suitable for tighten- ing a conveyor chain or band, although as shown it allows of only a short movement. Tightening gears of the same design can be made of much greater lengths. The ad- justment screw is fitted with a nut, so that the position, once adjusted, can be firmly secured. The screw can also be fitted with a hand wheel, which is often more convenient. Fig. 257 shows a similar tighten- ing gear, manipulated by screws and long conveyors where a great deal Fig. 256. Tightening Gear for Conveyors. hand wheel. This gear is particularly suitable for of adjustment is required, as the position of the tightening gear can be altered on a base plate into a variety of places. I Fig. 257. Type of Tightening Gear for Long xA.djustments. The band or chain should always be tightened at the terminal opposite to that carrying the driving pulley, but where this is not practicable the gears shown in Figs. 258 and 259 are suitable for the driving end of elevators or conveyors in cases where i9i