. Material handling cyclopedia; a reference book covering definitions, descriptions, illustrations and methods of use of material handling machines employed in industry . ey rope and is again lowered intothe vessel. Two operators are required, one operator con-trolling the opening and closing and the raising and lower-ing movements of the bucket, the other controlling themovement of the trolley on the boom. Unloaders of this type have a capacity of from 75 to300 tons per hour, depending on size of bucket which rangesin capacity upward to about 2 cu. yd. One-Man Unloaders The one-man type of to
. Material handling cyclopedia; a reference book covering definitions, descriptions, illustrations and methods of use of material handling machines employed in industry . ey rope and is again lowered intothe vessel. Two operators are required, one operator con-trolling the opening and closing and the raising and lower-ing movements of the bucket, the other controlling themovement of the trolley on the boom. Unloaders of this type have a capacity of from 75 to300 tons per hour, depending on size of bucket which rangesin capacity upward to about 2 cu. yd. One-Man Unloaders The one-man type of tower unloader is used chiefly forunloading coal, ore, etc., from vessels. This machine con-sists of a steel-frame tower having a hinged boom carryinga hoisting unit of the man-trolley type which may be movedalong the boom. The trolley carries the drums, motorsand controllers required to operate a grab bucket and alsothe operator. The boom may be raised to clear the mastsof vessels, alongside the wharf. After the bucket has beenfilled and hoisted, the trolley is moved along the boom andthe material is discharged into a hopper. From the hopper 284 HOISTING MACHINfiRY. Coal Hoisting Tower Unloading from Vessel to Storage
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Keywords: ., bo, bookcentury1900, bookdecade1920, booksubjecthoistingmachinery
