Patent GB-544519-A (GB)
Title: Improvements in or connected with chutes for dealing with material such as coal
IPC: B65G67/00
Filed: 1941-01-22
Abstract: 544,519. Loading wagons from shoots. MAVOR & COULSON, Ltd., and THOMSON, J. Jan. 22, 1941, No. 833. [Class 78 (i)] In a tub-loading device comprising a shoot B of variable inclination which can be raised to allow a tub D to be wheeled underneath and lowered to discharge into the tub, the shoot is automatically raised and lowered by power means as a result of the action of running a tub into and withdrawing it from the receiving position under the shoot. In the construction shown in Fig. 1, coal is delivered from a conveyer (not shown) to the shoot B which is in two portions B<SP>1</SP>, B<SP>2</SP> hinged together at 1, the part B<SP>1</SP> being suspended by chains 2 and the part B<SP>2</SP> by ropes 4 connected to an hydraulic ram J and a counterweight P. The shoot may have a shaking movement imparted thereto by a motor C. An electrically-driven pump (not shown) is connected by pipes 3 to a stop valve F, the ram J, and a distributing or reversing valve H, controlled by the counterweight P. Normally the shoot is in the raised position shown in full lines. When a tub D is wheeled under the shoot its front axle strikes a trip device K and opens the valve F, thus admitting pressure through the valve H to the ram to lower the shoot. As the shoot descends its gate 5 automatically opens and coal is delivered to the tub. When the shoot reaches its lowest position the counterweight P strikes a lever L and shifts the reversing valve to its other extreme position so that the ram is reversed and the shoot raised again, delivery of coal continuing until the operator closes the gate 5 by hand. With the raising of the shoot the counterweight P falls and strikes a lever M to shift the valve H to an intermediate position in which liquid supply to the ram is cut off so that the shoot is held in its raised position. The tub is then run out and its rear axle strikes the trip K and closes the main stop valve F simultaneously opening a bye-pass to the valve H to shift the latter to its normal position ready to lower the shoot when the valve F is opened by the next tub run into position under the shoot. Compressed air may be used instead of hydraulic power. In the construction shown in Fig. 5, the shoot portion B<SP>2</SP> is raised and lowered by means of an electric motor R driving a winch S connected by a rope T to the end of the shoot. V is a counterweight for the shoot, and A is the conveyer feeding the shoot. When a tub D is run under the shoot its front axle strikes a trip device N connected by a lead W to the main switch box Q so that the motor is started in the direction to lower the shoot for deliving coal into the tub. As the shoot is lowered a screw shaft 7 is rotated by the motor and one of a number of nuts thereon actuates a reversing switch when the shoot has reached its lowest position, so that the motor is reversed and raises the shoot. When the shoot reaches its highest position the motor is stopped by means of another nut. The tub can now be pushed out, its second axle not affecting the motor which is only restarted when the first axle of the next tub strikes the trip N. Instead of using a trip device such as N the tub itself may make and break an electric circuit by means of one of its axles and the wheels thereon in conjunction with the rails on which the tub runs. Specification 533,659 is referred to.