The Birmingham age-herald., 1920-12-30
LARGEST STEAM
 DRIVEN HOIST
 RECONSTRUCTED
Notable Achievement in Me- ChanicaI Engineering Is the Quincy Hoist That Has
 Been Recently Installed

As an item of special interest to those engaged in the mechanical and engineer ing department of the mining industry, Erskine Ramsay calls attention 10 de- scriptiou of the largest steam driven hoist yet constructed, which appeared m a recent issue of the Engineering and Mining Journal:
 At the Quincy company's No. 2 shaft at Hancock, Mich, the largest steam driven hoist as vet constructed has just been completed. The hoist operates in balance and is designed to raise a load of ten tons of rock at q rope speed of 3.2o0 feet per minute The drum is of the cylindro-conical type, with maximum diameter of 20 feet. minimum diameter l6 feet and q rope capacity of 10000 feet of ] 5-S-inch rope sufficient to attain ver- teal depth in the incline shaft of 66D0 feet. By winding the rope down on the opposite cone the rope capacity reaches 1S,500 feet, equivalent to q vertical depth os $500 feet. The drum is carried by two main bearings 2S inches in diameter by 54 inches long, upon triangular-shaped castings. which in turn. rest upon the concrete foundation and also support the four engine frames and cylinders
 A cross-compound steam engine. with
 
 cylinders each side respectively, is at tached to the cranks of the drum. Each engine is set at f5 degrees to the verti- cal and both engines a side are at tached 10 common crank pin l5Xl51a inches in diameter. High-pressure cylm- ders are g inches i'll diameter, low-pres- sure 50 inches, and stroke is G6 inches. The low-pressure pistons are supported by crosshead and tail guides. tTigh- nTpSSlIrp niGtpn rodG uO low-pressure 10 inches in diameter Cross head pins are Sxi2 in. Between eacn high pressure and low-pressure cylinder relocating receiver is placed the pres sure within which is under the control of the operator
 The condensing equipment is designed to handle l,460 pounds of steam per trip Of 10000 feet. The low pressure cyIn- ders exhaust into a steam drum & rec, in diameter and 17 feet long, from which the exhaust steam passes to the air pumps
 The hoisting drum weighs 5t6000 pounds exclusive of the shaft If is constructed in forty-eight sections. which are bolted together. Inner trusting prevents any Reflection. Eight impulses per revolution together with the great mass of the hoist eliminate all pulsatious m the rope. Post brakes of an improved type. l6 feet in diameter. arc attached to each end of the drum Each pair of brake shoes Is operated by an oil cylinder which re- ceves it's oil from loaded accumula- tors The oil cylinders are controlled by special valves, one controlling the lift and the other the drop of the piston. and so arranged that both valves cannot be opened at the same time Throttle ana reverse mechanism are handled in the Same way.
 All of the mechanism is operated by a floating lever gear and is under the con trol of the operator. By means of an lm- proved safety stop the throttle can be automatically closed as the skip ap- breaches the landing. Overwinding ap- plies the brakes automatically and the control is so arranged as to prevent starting the hoist in the wrong direction. A speed governor controlling the cut-on cams of the valve gear prevents over speeding.
 The total weight of the hoist with con densng equipment is 1765.000 pounds; floor space covered is 60x54 feet, and vertical height from foundation to top of drum is 60 feet. The weight of lO- OO9 feet of 1 5-S-inch rope is 4l5p pounds; weight of skip. 10000 pounds time required for one trip of l0,o0o feet, minutes, seconds.
 The Nordberg Manufacturing Co.. Of Milwaukee, Wis, designed and manu- factured the hoist