. Rivista americana di ingegneria e ferrovia. els. Le ruote dentate sono in acciaio e presentano un design estremamente pesante. L'albero da uno un leggero movimento ad angolo retto rispetto alla mezzeria del binario su cui il carrello viaggia, e ciò consente l'espansione e la contrazione delle travi principali della gru. Inoltre, permette che i mandrini su cui si muove la gru siano leggermente fuori allineamento, poiché le sfere formano giunti universali tra i carrelli e la gru. La disposizione degli ingranaggi che collegano gli alberi guidatiai carrelli è tale che le vibrazioni dei carrelli intorno a t.
1593 x 1568 px | 27 x 26,6 cm | 10,6 x 10,5 inches | 150dpi
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. American engineer and railroad journal . els. The gear-wheels are steel castingsand are of extra heavy design throughout. The shafting from one a slight motion at right angles to the center line of the track onwhich the truck travels, and this permits of the expansion andcontraction of the main girders of the crane. It also allows thetrucks upon which the crane travels to be slightly out of align-ment, as the balls form universal joints between the trucks andthe crane. The arrangement of the gearing connecting the driving shaftsto the trucks is such that the vibrations of the trucks around thecenters of the balls do not disturb the alignment of the gearingto an appreciable amount as the centers of the main driving spurwheels are on the same lines as the centers of the balls. in the center of the crane is placed a 50-horse-power electricmotor, connected directly to the main shaft with one reduction ofsteel gearing. The trolley which travels upon the suspended run-away beneath the main chord is of the ordinary crane type, with. Truck for 200-foot Gantry Crane- truck to theother is four inches in diameter. The couplings are allrigid flanged couplings, tightly keyed to the shafts, and fitted withturned bolts of a tight driving fit. The main shaft, extending thelength of the crane, is carried in universal bearing pillow-blocks ofvery heavy design. These pillow-blocks are bolted to the crossbeams of the floor system, with packing pieces between them andthe beams, and are lined up perfectly true and level. The endbearings, where the main shaft is geared to the diagonal shaftsthat connect it to the trucks at each end, are carried bv compoundboxes, so that it is impossible for the main and angular shafts toget out of line. The top of each truck carries a steel socket or cup and in thissocket is placed a hard steel ball 6 inches in diameter. The bottom of the end supports are also provided withcorresponding cupped sockets. The ball rests in a slightlyelongated groove; the m
