Canadian engineer . lted tothe gussets. The link bears on these collars. The endsof the link are fitted with cast steel bearing collars andbronze bushings lubricated from compression grease cups. The bridge is operated by an operating strut pin con-nected to the top chord of the tower at one of the inter-mediate panel points. This strut has bolted to its underside a cast rackwhich engages a pinion on the moving leafnear the hip joint, the pinion being held in mesh with therack, by means of a carriage with rollers bearing againstthe top and bottom flanges of the operating strut. Thispinion is d
Canadian engineer . lted tothe gussets. The link bears on these collars. The endsof the link are fitted with cast steel bearing collars andbronze bushings lubricated from compression grease cups. The bridge is operated by an operating strut pin con-nected to the top chord of the tower at one of the inter-mediate panel points. This strut has bolted to its underside a cast rackwhich engages a pinion on the moving leafnear the hip joint, the pinion being held in mesh with therack, by means of a carriage with rollers bearing againstthe top and bottom flanges of the operating strut. Thispinion is driven by means of two 40 electric motorsand a series of gears that are very clearly shown on PhotoNo. 4. The portal at this end of the moving leaf consistsof two girders, one with a vertical web and one with webinclined at the same slope as the post, as shown on Plate4. From the bottom of these two girders a platform iscantilevered out towards the counterweight tower and the 658 THE CANADIAN ENGINEER Volume machmery is carried on this platform andthe portal. The lubrication of this machinery was arranged so as to be ef-fective at any position of the bridge. Thebridge can also be operated by hand fromthe lower deck by a chain. The operators cabin is situated on thesouth side of the bridge and rests onbrackets that cantilever from the outsideof the tower truss almost directly over themain trunnion. It is indicated on PlateNo. 3, but has two stories instead of onlyone, as shown on the plate. The upperstory was added to accommodate the stor-age batteries to operate the electric inter-locking signals controlling the approachesto the bridge. It contains the switch-boaTras from which are operated the maindriving motors of the bridge^ the motorfor the latches on the toe of the movingleaf, the brakes, etc. An automatic cutout is arranged to prevent the bridge fromopening a greater angle than 80 degrees30 minutes or the fully open signals indicate for the rai
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishertoron, bookyear1893
