GB797674A - Improvements in or relating to conveyors and elevators - Google Patents

Abstract

797,674. Endless-belt elevators. HURST, J., and WESTHURST, Ltd. March 9, 1956 [March 16, 1955; April 25, 1955; Jan. 19, 1956], Nos. 7715/55, 11850/55 and 1905/56. Class 78(1). A push-plate type elevator consists of a series of pairs of moulded flights 53, Fig. 3, mounted on a rubber-and-canvas belt 31. Each pair of flights is connected by a pair of rods 52 which are bonded into rubber enlargements 51 formed integrally with the belt. The ends of the rods are received in bosses 54 on the flights. Each flight has a flat body portion which is bounded by stiffening flanges 55, 56, 57. The belt and the flights may be made of polyvinylchloride, stainless steel, fibreglass or an inodorous plastic, e.g. polythene. The elevator works in a sheet-metal casing 11, Fig. 1, and raises material through a duct 13 from a hopper 22 mounted on the outside of the casing to a discharge shoot 45. Material passes from the hopper into the part 12 of the casing through a slot 21. The pulleys 33, around which the belt passes, each consist of two parallel plates with inclined rims which are spaced apart and provided with openings 65, Fig. 5, for the outlet of material trapped between the belt and pulley. The openings in one plate are staggered with respect to those in the other. The shaft 93 of the pulley 33 is mounted in an arm 94 which is pivoted to the casing and can be moved to alter the tension of the belt by screw-and-nut mechanism 95, 96, 97. When in use the casing rests on the ground and is kept stable by a pair of legs 23 provided with protuberances 26 which keep the wheels 25 provided for transport out of engagement with the ground. The spindle 35 of the upper pulley projects through the casing and is connected by gears 34, 36 to the outlet shaft of a gear-box 37. Belts 40, 42 and an intermediate pulley 41 connect the gear-box to an electric motor 43. The pulley 41 has outer conical flanges 71, 72, Fig. 8, fixed to a spindle 73 and a central double conical flange 75 which is slidable along the spindle. The spindle runs in ball bearings in a block 74 which is slidably mounted on a guide-bar 76, Fig. 7, and is engaged by a lead-screw 80. This screw is connected by bevel gears to a shaft 83 carrying an operating handle 46. The relative speeds of the belts 40, 42 are varied by turning the handle.