. Material handling cyclopedia; a reference book covering definitions, descriptions, illustrations and methods of use of material handling machines employed in industry . eand other loose material have been removed. Hand-Power Cranes Hand-power traveling cranes are particularly applicableto light or infrequent service in foundries, machine shops,engine rooms and other places where speed of operationis not required. The bridge of such a crane generally is constructedeither of a single or a double standard I-beam girder, ora special Bethlehem beam. A single-web or a box-girderbridge is used for
. Material handling cyclopedia; a reference book covering definitions, descriptions, illustrations and methods of use of material handling machines employed in industry . eand other loose material have been removed. Hand-Power Cranes Hand-power traveling cranes are particularly applicableto light or infrequent service in foundries, machine shops,engine rooms and other places where speed of operationis not required. The bridge of such a crane generally is constructedeither of a single or a double standard I-beam girder, ora special Bethlehem beam. A single-web or a box-girderbridge is used for some cranes of this type when designedfor special heavy service. The bridge is mounted on two-wheel end trucks propelled by means of gears attachedto one wheel or to an axle extension on each end truckand to the squaring shaft. The power is applied by meansof an endless chain running over a sheave usually keyedto the squaring shaft or in some cases, to a separatesheave shaft, and is operated by hand from the floor. Single Girder Cranes On single girder cranes, the trolley either has only twowheels and travels on top of the beam or has two or 160 HOISTING MACHINERY. CRANES 161 more wheels on each side of the beam and travels along power overhead traveling cranes as determined by good the lower flange of it. Usually the trolley is equipped engineering practice are given in the following table: with gearing and is propelled across the bridge by means of hand chains, but on some cranes of very light capacity ^^™^°^,^^ ^^^^^^ the trolley is a simple traveler and is moved by pulling Capacity, Span wheel Weight of or niishino- nn thp 1nar1 ? Tons Ft. In. load (lb.) rail (lb.) Girder or pusmng on tne load. 5 ,(, g ggoQ 25 Beth beam The hoisting apparatus on hand-power cranes of the ^^ 60 0 10,600 25 |in|k web girder lightest capacities usually consists of a chain block or 60 0 30 Single web girder hoist which may be permanently attached to the trolley Hy. 60 0 ll
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Keywords: ., bo, bookcentury1900, bookdecade1920, booksubjecthoistingmachinery
