. The Street railway journal . as is also the connec-tion between transoms and frame fillings. If desired theend frame may consist of an angle iron secured to the sideframes by means of corner gussets or may be omitted en-tirely by strengthening the transom channels and proportioned and constructed it is practically im-possible for this frame to get out of square in the hardestkind of service. For outside hung motors the type of frame is necessarilymodified, as shown by Fig. 4. The end frames are of angleiron bolted or riveted to the side frame extensions. Thelocation of motor
. The Street railway journal . as is also the connec-tion between transoms and frame fillings. If desired theend frame may consist of an angle iron secured to the sideframes by means of corner gussets or may be omitted en-tirely by strengthening the transom channels and proportioned and constructed it is practically im-possible for this frame to get out of square in the hardestkind of service. For outside hung motors the type of frame is necessarilymodified, as shown by Fig. 4. The end frames are of angleiron bolted or riveted to the side frame extensions. Thelocation of motors require the equalizing springs to beplaced on the outside of the pedestals to give a longerspring base which necessitates a proportionately greaterdepth of section in the top members of the side frame, dueto the overhang from the trucks. The end braces also be-come necessary to support the end frames, which carryabout 40 per cent of the dead weight of the motor. Fortrailer trucks the frames usually conform in general design. FIG. 4.—TRUCK FRAME FOR OUTSIDE HUNG MOTORS to those of the motor trucks with which they are to beused. The chief advantages of equalizers are a shorter trussin the side frame, a slightly added resiliency of the helicalsprings and diminution of frame height over the journalboxes which could be avoided otherwise only by a multiplenest of helical springs. The transfer of weight from oneaxle to another is entirely uninfluenced by them. Some-times these equalizers are fastened rigidly to the journalboxes, but this is not good practice. The object sought isa prevention of spread of wheel base during brake applica-tions, which means a loss of brake piston travel. In thebest electric trucks, journal boxes are accurately machinedinside and outside, as are also the pedestal legs, and theclearances are small. Therefore, the spread of the wheelbase during braking is small. When the journal boxes arerigidly fastened to the equalizers, the faces of the journalboxes
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
