. The Street railway journal . are usually very long, and of course have a total deflectionin proportion. On these trucks no brake-beam is necessarywhere inside brakes are used, as a tie to hold the shoes inplace is all that is required. With this style of truck, twolive and two dead levers are used with a curved brake-hangers are usually connected with links directlywith the shoe-head and, as a rule, fastened towards the topof the head, but the same general conditions prevail in re-gard to shoe wear. The links should be started \yith aboutten degrees slant, so that the weight of th
. The Street railway journal . are usually very long, and of course have a total deflectionin proportion. On these trucks no brake-beam is necessarywhere inside brakes are used, as a tie to hold the shoes inplace is all that is required. With this style of truck, twolive and two dead levers are used with a curved brake-hangers are usually connected with links directlywith the shoe-head and, as a rule, fastened towards the topof the head, but the same general conditions prevail in re-gard to shoe wear. The links should be started \yith aboutten degrees slant, so that the weight of the shoe and headhave a tendency to release the brake-shoes from the wheel,independently of any release or kick spring. The pivot pointone the brake-shoe head, in this style of brake rigging, shouldbe a trifle below the center line of head to obtain the bestresults in ordinary service, as shown in Fig. 2. It is veryhard indeed to overcome these defects entirely on trucksthat are operated in both dii°ctons, but no trouble should. FIG. 1.—SHOE AND HEAD DESIGNED SO THAT PRESSURE ISAPPLIED IN A CENTRAL LINE FIG. 2. -PIVOT POINT ON BRAKE-SHOE HEAD A TRIFLEBELOW CENTER LINE OF HEAD a central line as possible, taking the center line at the pointwhere the brake-beam fits against shoe-head, as shown inFig. I, and applies to the brake-rigging so common on shortwheel base trucks where a brake-beam is used, and thepressure is applied to the center of the beam from a liveand dead lever. The brake-hanger in this case is also as-sumed to be suspended from the brake-beam independent ofbrake-head. The slides and guides to hold the brake-beamlevel should be fastened to either one of the beams witha slide for the other beam to work in. This reduces thefriction, and allows the beams to rise as the shoes wear,for the brake links swing in an arc and raise the beam asthe latter swings forward. In addition to these conditions, the truck builders, in try-ing to give the customer the easiest riding tru
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
