Patent GB-164338-A (GB)
Title: Improved automatic charging mechanism for cages
IPC: B66B17/20
Filed: 1921-06-04
Abstract: 164,338. Siemens - Schuckertwerke Ges. June 4, 1920, [Convention date]. Void [Published under Sect. 91 of the Act]. Driving-gear for endless belt, chain, and rope ccnveyers and elevators. - Apparatus for the mechanical charging and discharging of tubs into and from mine cages is designed so that the power is proportioned automatically to the load at all points of the operation, provision being made when desirable for disconnecting the power and utilizing weights or the like to perform the return stroke, while in some cases the power is cut off automatically in the case of an overload Fig. 1 shows one construction in which a slipping friction clutch is employed. The motor pinion 12 is constantly in mesh with internally and externally toothed loose wheels. A friction disc 11 on the driven shaft 8 can be moved axially in either direction by the controlling-lever 15 against the action of one or other of the springs 17, 19, so as to press the disc against one or other of the driven toothed wheels, and thus transmit a regulatable proportion of the total power of the motor through the gearing 7, 6 to the endless band 3 which actuates the pusher 2 engaging the tub 1. Fig. 2 shows a construction in which the regulation of the power is obtained by varying the braking-pressure on one member of an epicyclic gear, and simultaneously varying the motor resistance. In this case the motor 10 drives a sun-wheel 25, the driven shaft 26 being connected to the planet pinions, while the ccntrolling-lever 15 is connected to a brake band 29 engaging the internally-toothed ring of the gear. When the controlling-lever is in the "off " position the brake is free, and the sun-wheel and ring revolve in opposite directions, the driven shaft remaining stationary. The continued movement of the controlling-lever applies the brake with increasing force and gradually decreases the rotation or slip of the ring, thus transmitting increasing power and speed to the driven shaft. The same movement of the controlling-lever regulates a resistance 22 in the motor circuit. Fig. 3 shows a construction in which the charging movement is performed by holding the planetary member of an epicyclic gearing stationary through the medium of a brake 37 and the return movement is performed by releasing the brake 37 and applying a brake 40 to fix a sun-wheel 42. In this construction 29 is the motor pinion and 39 the driven pinion connected to the gear wheel 27. Fig. 4 shows a construction in which the controlling-lever is returned automatically to the "off" position in the event of an overload. The drive in this case is through a worm gear 51 mounted on a shaft which can slide axially against the pressure of the spring 55. Any definite movement of the controlling-lever 15, in addition to operating the motor controller 22, puts a corresponding definite ccmpression on the spring 55, which is equivalent to the safe load. In the event of overload, the back thrust of the worm overcomes the spring and returns the handle 15. In a further modification, a worm drive similar to that shown in Fig. 4 is combined with a friction clutch somewhat similar to that shown in Fig. 1. In this case the regulation is obtained by setting springs mounted on the friction clutch to pre-determined stresses to vary the pressure between the parts of the clutch. The Specification also refers to the operation of the charging devices by compressed air.