. The Street railway journal . andrigging when placed on cars in conjunction with air orother power brakes for use in case of their failure only. Theusual plain sway-bar, Fig. 13A, is so much simpler than thedouble or equalizer bar, Fig. 13B, and works with so muchless friction that it is not advisable to incur the extra com- October 4, 1902.] STREET RAILWAY JOURNAL. plication for a brake which is to be used in emergenciesonly. The rigging of each truck should, however, be pro-vided with dead or equalizing levers, as shown in Fig. 14,to increase the leverage on the shoe A enough to compen-sate
. The Street railway journal . andrigging when placed on cars in conjunction with air orother power brakes for use in case of their failure only. Theusual plain sway-bar, Fig. 13A, is so much simpler than thedouble or equalizer bar, Fig. 13B, and works with so muchless friction that it is not advisable to incur the extra com- October 4, 1902.] STREET RAILWAY JOURNAL. plication for a brake which is to be used in emergenciesonly. The rigging of each truck should, however, be pro-vided with dead or equalizing levers, as shown in Fig. 14,to increase the leverage on the shoe A enough to compen-sate for the direct pull on the head of the live lever trans-mitted to the shoe B. For successful operation, the hand-brake rigging, and toa less extent any power brake, must be very direct in itsaction in all parts. The fewer the parts and joints that gointo its make-up the less will be the lost motion and springor stretch, and consequently the less will be the number ofturns necessary on the brake staff to apply the shoes to the. FIG. 15.—REACTIONS OF INSIDE AND OUTSIDE BRAKE RIGGING wheels. The application of the shoes between the wheelsinstead of outside shortens up and reduces the number ofparts in the brake rigging, and for this reason, and others,generally proves the most satisfactory brake inside brake is convenient also in that the tops of thelevers are well away from parts of the car body liable to in-terfere. The greatest advantage of the inside brake, how-ever, is the reduced tendency toward tipping the truckframe when brakes are applied. This can be best illus-trated from Fig. 15. If the shoes between the wheels, asshown at a ant! b, be applied while the truck is running inthe direction indicated by the arrow, shoe a will press upand shoe b will pull down, each on its link, thus establishinga couple with a lever arm d c tending to raise the end / andlower the end e of the truck frame. This couple is re-sisted by the equalizer springs g h or the yoke s
Size: 2662px × 939px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
