File:Illustrated catalogue and general description of improved machine tools for working metal (1899) (14793344203).jpg

Identifier: illustratedcatal00sell (find matches)
Title: Illustrated catalogue and general description of improved machine tools for working metal
Year: 1899 (1890s)
Authors: Sellers, William, & co. (from old catalog)
Subjects: Machine-tools Machinery
Publisher: Philadephia, Levytype company
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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accompanying illustrations, which combines lightness andstrength in a marked degree. In this form the trolley or carriage travels withinthe jib, which is cross-braced from side to side above the carriage. The post inthe same manner is cross-braced and latticed on all four sides, while at the topand bottom of the post wide plates are used to thoroughly unite the parts of theframe. Cranes can be built in this form of great torsional strength, and able tostand the strain produced by rapid rotation of the loaded crane and its suddenstoppage, while the omission of the separate strut permits work to be moved muchnearer to the axis of rotation than is possible with the old form of construction. Jib-cranes may be supported on the top by bearings attached to the roof-girders or by struts from walls or columns, or they may be made to embrace col-umns which support the upper floor of a building, as in Plate No. 221, or the Wm. Sellers & Co.. Incorporated. Philadelphia, Pa. 265 Plate No. 218.
Text Appearing After Image:
5-TON STEAM PILLAR JIB-CRANE. Carried upon riveted steel pillar, bolted to foundation, driven by indepen-dent steam engine, and receiving steam from stationary boiler through top pintlebearing. Post of crane protected by cylindrical guard. Operating platform ele-vated. Maximum height of hook, 25 feet, Effective radius of the hook, 30feet. 266 Wm. Seli^krs & Co., Incorporated, Philadelphia, Pa. Swing Cranes—Conthmed. column may be a pillar, like that of the crane shown in Plate No. 218, secured toa sufficient foundation and requiring no support from roof or wall ; or the pillarmay be bolted to the platform of a car of sufficient weight and size for use invarious locations. Besides the jib-cranes described, in which the carriage sup-porting the load is arranged to travel radially along the jib, there are a number ofswing-cranes having a fixed radius of action or a limited variation, by raising orlowering the end of the frame, which, vibrating about an axis near the centre ofrotati

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