. Journal of electricity, power, and gas . intermittent character, the power required is at amaximum only a part of the time, even though the hoist beoperated practically continuously. In many cases the hoistis in operation only a very small part of the day. Theseconditions offer special advantages from an economical pointof view for the use of electric motor-driven hoists. Theelectric hoist is always ready, and uses power only in pro-portion to the load handled when it is in actual operation. The bearings are self-oiling and the motors seldom re-quire any other attention than an occasional in
. Journal of electricity, power, and gas . intermittent character, the power required is at amaximum only a part of the time, even though the hoist beoperated practically continuously. In many cases the hoistis in operation only a very small part of the day. Theseconditions offer special advantages from an economical pointof view for the use of electric motor-driven hoists. Theelectric hoist is always ready, and uses power only in pro-portion to the load handled when it is in actual operation. The bearings are self-oiling and the motors seldom re-quire any other attention than an occasional inspection andcleaning. There are no complicated parts to get out oforder or to require continual oiling, packing, etc. The elec-tric hoist may be operated by almost anyone, as no previousexperience or mechanical knowledge is required and anengineers license is unnecessary. The single and double drum electric motor-driven minehoists of the S. Flory Manufacturing Company, Bangor, Pa.,are well shown by the accompanying pictures. These hoists,. Single Drum Hoist. which are especially designed for mines, quarries, planes,shafts, etc., are equipped with I. O. Werner patent band fric-tion and are driven by Westinghouse motors. The patent band friction is of special design and pos-sesses many features of superior merit. It is actuatedthrough different members; the gear, drum, rocker shaftsand strap bands. The strap bands tighten on a cast rim onthe drums and are actuated by shafts which have doublestub ends and are connected to the ends by jaw ends andturnbuckles. The lever arms are keyed to the rocker shaftson opposite ends and are actuated by the levers which movearound fixed points on the gear. Slides are secured on thegear supporting the lever arms. The slides are actuatedthrough a sleeve on the main drum shaft and two radialarms which are secured to the slides. The frictions are thrownin and out of contact by means of hand levers in a battery,as shown by the cut of the double drum
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Keywords: ., bookcentury1800, bookdecade1890, bookidjo, booksubjectelectricity
