File:Railway mechanical engineer (1916) (14761480815).jpg

Identifier: railwaymechanica95newy (find matches)
Title: Railway mechanical engineer
Year: 1916 (1910s)
Authors:
Subjects: Railroad engineering Engineering Railroads Railroad cars
Publisher: New York, N.Y. : Simmons-Boardman Pub. Co
Contributing Library: Carnegie Library of Pittsburgh
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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unway race for1-in. diameter steel balls, the whole to encompass and madeto revolve around the column on ball bearings, shown indetail at E, Fig. 2. The upper casting is supported by alower pair of castings, D, bolted permanently to the column.Castings D have a corresponding race for the above men-tioned steel balls. It will be noticed that in both top and bottom pairs ofcolumn castings, provision is made for a groove 1 % in. by2 in., in which are placed steel tempered rings (in halves)with the usual V runways for the accommodation of a totalof 69 one-inch steel balls for the bearings. On the outer end of the trolley jib is a casting which actsas a spacer for the two 10-in. channels as well as a portablesupport for them as shown at F, Fig. 2. Two wheels, 9J^ in.in diameter, provided with roller bearings, are employed tosupport the weight of the jib on the runway and provide asnearly as possible frictionless radial movement of the jib. The outer end of the jib and any load which may be
Text Appearing After Image:
Fig. 1—Elevation Showing Column and Arrangement of Jib Crane with Motor Hoist 714 RAILWAY MECHANICAL ENGINEER Vol. 95, No. 11 imposed upon it is supported by a circular lj/j-in. by 9-in.wrought iron runway 41 ft. 0 in. in diameter. This runwayis suspended from the ceiling above by 24 one-inch by four-inch wrought iron hangers (see details shown at H, Fig. 2),made to hook over the top of, and bolted to, the structuralsteel I-beams J which are framed into the steel beams usedfor supporting the floor overhead, as shown distinctly inFig. 1. A four-wheeled trolley traverses the jib a distance of 18ft., and has two flanged and two blind wheels, the latterbeing keyed to the axle on which are keyed two 45-toothwheels, engaging a pair of 19-tooth spur gears which inturn are operated by an endless chain thrown over a 14-in.sheave pulley. This arrangement enables the trolley position,with or without load, to be changed at the pleasure of the Keeping Shop Orders Clean.—In spite of the best ef

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