. Journal of electricity, power, and gas . are thrown out of contact, the drums areloose on the shaft and will revolve free at high speed whenlowering or paying out the rope. The single drum hoist is shown with a Westinghouseelectric railway air compressor and air reservoir mountedon the base of the hoist. The reservoir is ocnnected to theair cylinder at the end of the drum shaft. The air valvesare actuated by a lever shown close to the battery of twolevers and controller. Very little exertion is required by themotorman to throw the friction in and out of contact as itis of the toggle type. Af
. Journal of electricity, power, and gas . are thrown out of contact, the drums areloose on the shaft and will revolve free at high speed whenlowering or paying out the rope. The single drum hoist is shown with a Westinghouseelectric railway air compressor and air reservoir mountedon the base of the hoist. The reservoir is ocnnected to theair cylinder at the end of the drum shaft. The air valvesare actuated by a lever shown close to the battery of twolevers and controller. Very little exertion is required by themotorman to throw the friction in and out of contact as itis of the toggle type. After the air compressor is put onthe contact continues until the friction is reversed by thereverse motion. The drums are turned off smooth or machine spirallygrooved for any size wire rope, and mounted on a self-contained cast-iron base arranged to receive the motor andcontroller. The drums for long planes or heavy loweringare equipped with asbestos brakes made out of long fibrematerial. The blocks are formed in sectors with iron flanges,. Double Drum Hoist. securely bolted under high pressure, and treated with are secured between cast-iron flanges and surroundedwith steel bands of the differential type. The brake bandsare operated with hand levers in notched quadrants fittedwith thumb latches, and are thereby securely held in anyposition. The advantage of asbestos brakes for long planesor shafts is decided. The single-drum hoist shown by the photograph was in-stalled at the Bliss Colliery of the D. L. & W. Company. Thedrum is 60 inches in diameter; 48 inches long between theflanges, and is designed for an 8,000 lb. rope strain at aspeed of 500 ft. per minute. The hoist is operated by aWestinghouse type HF 150 hp. alternating current type of induction motor is especially suited for applica-tion where a strong starting effort is needed. It is welladapted for use on circuits carrying lighting loads, as thestarting of it does not appreciably affect the voltage
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Keywords: ., bookcentury1800, bookdecade1890, bookidjo, booksubjectelectricity
