Identifier: streetrailwayrev14amer (find matches)
Title: The street railway review
Year: 1891 (1890s)
Authors: American Street Railway Association Street Railway Accountants' Association of America American Railway, Mechanical, and Electrical Association
Subjects: Street-railroads
Publisher: Chicago : Street Railway Review Pub. Co
Contributing Library: Carnegie Library of Pittsburgh
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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st carries a vertical channel about 5x3 in., built up of 3 x 3 x J^angles, in which the tower legs move. These legs are 4 x 4 in. andform a square about 4 ft. 6 in. and are braced strongly together in alongitudinal direction, but the pairs of legs are not connected at thebottom and have no bracing in a transverse plane. This gives a per-fectly free passage through the car regardless of the position of the two crank handles applied to the end of a shaft extending clearacross the car. Two pinions on this shaft drive, through trains ofgearing placed on the tower posts, shafts on which the hoistingchains wind. Each chain, after passing over a sheave near the roof,is attached to the cross piece at the bottom of the tower leg and apawl working on a ratclict wheel keyed to the first shaft holds thetower in its raised position. To lower the tower the pawl is dis-engaged by a handle on each side of the car and the cranks are al-lowed to revolve freely, no brake having been found necessary. The
Text Appearing After Image:
lower has a vertical travel of 4 ft. 9 in., so that the floor of theplatform is at a height of 16 ft. above the track level when it is inits highest position. The clearance height above the rail when thetower is lowered is 12 ft. 3 in. The working platform is 12 ft. 7 in. long .x 4 ft. 6 in. wide, andwhen swung out extends 10 ft. 3 in. from the center line of track.Its construction is light and strong, consisting of three 4-in. x ij^-in.longitudinal pieces with cross pieces of the same size at the endsand a J^-in. truss rod on each side resting on a 12-in. king-post. Railings 2 ft. high, hinged to fold down when not in use, areprovided on the sides. Eight small rollers on the bottom of theplatform run on a fifth wheel of 2V2 x J/j-in. steel on top of the towerand take the weight, while a center pin prevents lateral displace-ment and a stout clamp on a timber placed transversely on top of the

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