File:Cassier's magazine (1904) (14765908531).jpg

Identifier: cassiersmagazi2719041newy (find matches)
Title: Cassier's magazine
Year: 1891 (1890s)
Authors:
Subjects: Engineering
Publisher: New York Cassier Magazine Co.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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SPECIAL FORMS OF CRANES 397 A Titan crane possesses a certainamount of similarity to a portal crane,because space is left underneath betweenthe frames or uprights for the rows ofblock trucks as the crane runs overthem. It is much quicker to work inthis way than to slew the crane each high quality. The joints are plated inthe girder work, and as the mechanismhas to be shipped in sections, this meansthat these sections have to be bolted to-gether temporarily during erection andfor testing. Punched holes are neverallowed here, but the holes are either
Text Appearing After Image:
(7.—A 75-TON ELECTRIC REVOLVING CRANE BUILT BY THE DUESSELDORFERKRAHNBAUGESELLSCHAFT LIEBE-HARKORT, M. B. H. time a block is fitted and deposited.Most of them have racking jennys,as well as capacity for longitudinaltravel. The workmanship in these machineshas always been, and necessarily so, of reamered or drilled, and turned boltshave to be inserted. The gears, thoughcast, are mostiy machine moulded. Thelarge slewing ring is cast in sections andheld down with turned bolts in ream-ered holes. Wire rope is generally 39* CASSIERS MAGAZINE used in preference to chains for lift-ing. The functions of these cranes are notquite restricted to the work for whichthey were originally designed. Besideshandling the concrete blocks, they areused for grabbing, for lowering divingbells and for depositing concrete in bags.Fig. 16 shows two of these functions ina crane built by Ransomes & Rapier.The grab is operated by a special fixtureat the end of the jib. It is used in pre-paring the ground at

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