. The Street railway journal . runs, as shown in Fig. 3. To take the downward thrust of thisnut a ball bearing is provided, since the four nuts of the hoist,when lifting the car body, must together support and turnunder the full weight of the car body. The 5-in. bars orcolumns slide up and down in 5-in. pipe. They are slotted atthe top, and the 12-in. I-beams rest in these slots, as seen inthe cuts, Figs. 3, 4 and 6. The bottom flange of the I-beam iscut away for 5 ins., so that the web of the I-beam slides directlyinto the slot in the end of the bar. As the sprocket chain drivesall four of th
. The Street railway journal . runs, as shown in Fig. 3. To take the downward thrust of thisnut a ball bearing is provided, since the four nuts of the hoist,when lifting the car body, must together support and turnunder the full weight of the car body. The 5-in. bars orcolumns slide up and down in 5-in. pipe. They are slotted atthe top, and the 12-in. I-beams rest in these slots, as seen inthe cuts, Figs. 3, 4 and 6. The bottom flange of the I-beam iscut away for 5 ins., so that the web of the I-beam slides directlyinto the slot in the end of the bar. As the sprocket chain drivesall four of the nuts simultaneously the I-beams on both of thetracks rise together. After hoisting a car it is necessary only toplace an old rail or I-beam under each end of the car, restingupon the I-beams of the hoist, and to start the motor drivingthe hoist. The motor used is an old Sprague railway motor with thedouble reduction gears just as they were used under the is placed with its shaft vertical, as shown in Fig. 7. It is in. use very little, and it was not thought necessary to provideany special thrust bearing on the armature shaft, as the usualcollar on the armature shaft was sufficient to sustain its thrust. The motor is mounted upon a frame, which can beslid along to tighten up the sprocket 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 nat
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
