. The Street railway journal . rocket chain. As shown in the general plan of the shops, , twenty-four of the repair tracks have car hoistsand twelve have pits. The remaining fifteen trackshave no pits. The motors, sprocket chains andjacks are entirely below the level of the concretefloor. The motor in each case is placed betweenthe tracks in a pit, which is covered over withplank, as shown at the far end of the pit, Fig. tracks is a narrow tunnel, which accom-modates the sprocket chains of the hoists of thetwo adjoining tracks. The dimensions and detailsof construction are all f
. The Street railway journal . rocket chain. As shown in the general plan of the shops, , twenty-four of the repair tracks have car hoistsand twelve have pits. The remaining fifteen trackshave no pits. The motors, sprocket chains andjacks are entirely below the level of the concretefloor. The motor in each case is placed betweenthe tracks in a pit, which is covered over withplank, as shown at the far end of the pit, Fig. tracks is a narrow tunnel, which accom-modates the sprocket chains of the hoists of thetwo adjoining tracks. The dimensions and detailsof construction are all fully given on the draw-ings, Fig. 3, so that further explanation of them isnot necessary. One of the first questions which would naturallybe asked in connection with this new form of hoistis as to its cost as compared with hydraulic jacksfor performing the same work. In selecting thistype of hoist, however, the management of the Transit Company did not consider this fea-ture a controlling one, because it believed this. FIG. -CAR ON HOIST, SHOWING LOCATION OF HOISTCONTROLLERS FIG. TRACK, SHOWING HOIST AND DEEP ANDSHALLOW PITS form of hoist to be so much superior to hydraulic jacksor chain-block hoists in point of safety as to makethe latter out of the question. Some personal experiencewith the breaking of chain blocks when used as hoistsfor car bodies led the management to give very earnestconsideration to the question of safety. It is believed thatthis screw-jack hoist is as nearly absolutely safe as anyhoist can be made. In fact, the liability of accident with it ispractically nil. The car body when hoisted is supported onfour solid columns of 5-in. round steel. These columns aresupported at the floor surface and at the nut 5 ft. below thefloor when the car is hoisted. The car body could not fall with-out bending at least two of these 5-in. columns. Anotherstrong point in connection with this hoist is that while it isfully as rapid as the hydraulic or pn
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
