Patent GB-266107-A (GB)
Title: Improvements in hoisting apparatus
IPC: B66D5/02
Filed: 1926-01-19
Abstract: 266,107. Marks, E. C. R., (Nordberg Manufacturing Co.). Jan. 19, 1926. Compressed-air engines.-A hoisting engine for a deep mine shaft is connected to a compressed air engine or other fluid pressure motor which is adapted to supplement or to retard the action of the engine, the retarding action being such that large friction brakes may be dispensed with. The air compressed during the braking action is stored and used for driving the motor. The winding drum 8, Fig. 1, is driven by a steam engine 1, the piston rod 4 ,Fig. 2, of which is connected to the piston rod 5 of the air engine. A gear 10 mounted on the engine frame is provided with two eccentrics, one of which actuates the wrist plate 12 of the engine 1 by means of the rod 13, and the other of which is connected by a rod 14 to a lever 15. The wrist plates for the air engine are connected to opposite ends of the lever 15. The gear 10 meshes with the gear 18 of a pair of intermeshing gears 17, 18 mounted in a frame 19. The arm 26 of a bell-crank lever mounted on a shaft 21 is connected to the frame 19 and its other arm 25 is connected by a rod 24, bell-crank lever 28 and rod 27 to a lever 26<a>. The shaft 21 is driven from the shaft of the drum 8 and carries a gear 20 on which the gear 17 rolls when the frame 19 is shifted and thereby changes the action of the valve gears of the engines. The air engine is changed from a motor to a compressor by turning levers 53, 56 which are connected to the trip cams controlling the points of cutoff of the inlet and exhaust valves. These levers are connected by rods 85, 84 with forked and slotted ends, respectively to pins 82, 81 on a bell-crank lever 79 which is pivoted to a bellcrank lever 75 mounted below the platform 30. A rod 76 attached to the lever 75 has a pin-andslot connection with an arm 74 of a hollow sleeve 61, Fig. 4. This sleeve is rotatably mounted in brackets and receives a plunger 62 which is connected by a link 63 to a lever 58. The lever 58 is pivoted in an arm 60 of the sleeve and is connected by a rod 64 to an arm 65 of a shaft 66. Arms 69, 72 of this shaft are connected by rods 71, 74 to the throttle valves 70, 73 of the air and steam engines, respectively. The lower arm of the lever 79 is connected by a rod 86 and bellcrank lever 87 to a member 92 carrying a pivoted block 93 which slides in a link 94. The lever 87 is connected by a rod 89 with a forked end to a pin 90 on an arm 91 on the sleeve 61. The link 94 is pivotally connected to and supported by plungers 97 slidably mounted in a support on the engine frame and riding on cams 100 fixed to intermeshing gears 101 on shafts 102. One gear 101 is connected by worm gearing to a shaft 104 which is driven by worm gearing from a shaft 107 connected by chain gearing to a shaft 21. The ratio of the gearing is such that each cam makes almost one complete revolution while the cage is traversing the shaft. The cam 114 of an intensifier for the air engine is driven from the shaft 21 and actuates a piston valve 115 to connect one side of the cylinder of the air engine with the other when the engine is acting as a compressor. In a modification the hoisting engine comprises two steam cylinders one of which is connected to a high-pressure cylinder of an air engine for co-operative driving of the winding drum shaft, and the other of which is connected to a low-pressure cylinder for the same purpose. A heater is placed between the air cylinders when they are acting as motors, and a cooler is interposed when they are acting as compressors. The steam engine may be replaced by an electric motor.