File:Illustrated catalogue and general description of improved machine tools for working metal (1899) (14586832989).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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ove the trolleyor any portion of it; while with the external trolley, a separate structure must beerected for this purpose, unless the roof of the building can be relied upon tostand the load, which is not usually the case. We are not restricted however tothe internal trolley, and build many cranes of the deck or outside trolley type andare prepared to modify our constructions as required by the given conditions or tomeet the preference of purchasers. There are two general arrangements of machinery employed in our travel-ling cranes ; these form two distinct types or styles. In the first, the trolley con-tains the hoisting mechanism and drums. In the other, the drum and hoistingmachinery are attached to the bridge at some fixed point, and the chain or wirerope is led around suitable sheaves and through the trolley or carriage ; this isexactly the arrangement of hoisting machinery which is used in jib-cranes. The Wm. Sellers & Co., Incorporated, Philadelphia, Pa. 283 Plate No. 231.
Text Appearing After Image:
6-TON TRAVELLING CRANE.In Flask Shop, Works of Wm. Sellers & Co., Incorporated. 43 feet span. With hoisting drum fixed at one end of the bridge. Allmovements by electric motors. This is a special crane designed for occasionaluse. No regular attendant is required ; can be operated by any workmanin the shop. Operator stands on a hanging platform, which is accessible fromthe floor. 284 Wm. Sellers & Co., Incorporated, Philadelphia, Pa. Travelling Cranes—Continued. first type requires usually a larger and deeper bridge, but the movement of thehook is steady, and is free from any irregularity of motion such as may be pro-duced by the sagging of the chains in the fixed drum or jib-crane type. Thisirregularity is insignificant in short cranes, and for many purposes the fixeddrum-cranes are perfectly satisfactory, and as they occupy very little head-room,are adapted for old shops and other locations where vertical height is limited.Both types of our cranes hoist the load in a vertic

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