. Material handling cyclopedia; a reference book covering definitions, descriptions, illustrations and methods of use of material handling machines employed in industry . angement of a basement freight elevatora car of the simple platform type with access from two ELECTRIC ELEVATORS 479 sides is used and the lifting and counterweight cables passover the overhead sheaves to the winding engine and coun-terweight respectively. The arrangement of counterweightsis a matter of layout. As a general rule they are placedwhere convenient, after the location of car gates has beendecided. The type of car
. Material handling cyclopedia; a reference book covering definitions, descriptions, illustrations and methods of use of material handling machines employed in industry . angement of a basement freight elevatora car of the simple platform type with access from two ELECTRIC ELEVATORS 479 sides is used and the lifting and counterweight cables passover the overhead sheaves to the winding engine and coun-terweight respectively. The arrangement of counterweightsis a matter of layout. As a general rule they are placedwhere convenient, after the location of car gates has beendecided. The type of car illustrated is suitable for speedsnot to exceed 50 ft. per min. The loads should not exceed5,000 lb., but with suitable changes in the design thecarrying capacity may be made much higher. to the motor pinion adjacent to the drum. The control isobtained by means of a cable actuated b\- hand-rope, leveror wheel in the car. Internal Gear Worm Drive The chain drive engine just described showed a methoduf acquiring gear reduction in addition to that obtainedby the simple worm drive. Another solution of the sameproblem is offered by the internal geared engine, where the. Worm Gear Winding Engine—Basement For freight service an overhead installation has the par-ticular advantage in that it requires less rope. The inertiaof the cables is decreased and therefore also the power con-sumption. The increased cost of installing overhead may,however, be sufficient to make it advisable to locate theelevator in the basement, even with the disadvantage ofincreased power consumption. This is particularly trueof heavy machines. Chain Drive Worm Gear Where loads are unusually heavy and may be operated atlow speeds the gear reduction obtained by a single wormand worm wheel may be insufficient. One solution of thisproblem is the chain driven elevator in which a chain driveis used in addition to the worm and wheel drive. In atypical arrangement which is used when considerable gearreduction is desire
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Keywords: ., bo, bookcentury1900, bookdecade1920, booksubjecthoistingmachinery
