. The Street railway journal . they will be in shear. The vertical load upon the frame is carried by the sideframe trusses between the equalizer springs. No verticalload is carried by portion of frame beyond these top member is not subject to bending, due to the trac-tive effort, the bottom members also being in tension orcompression with it, and therefore its section can be selectedwith a view to assisting lateral stability without undueweight. By reason of the journal box flanges and theweight upon the journal boxes, very little deflection of thepedestal legs and consequent twist
. The Street railway journal . they will be in shear. The vertical load upon the frame is carried by the sideframe trusses between the equalizer springs. No verticalload is carried by portion of frame beyond these top member is not subject to bending, due to the trac-tive effort, the bottom members also being in tension orcompression with it, and therefore its section can be selectedwith a view to assisting lateral stability without undueweight. By reason of the journal box flanges and theweight upon the journal boxes, very little deflection of thepedestal legs and consequent twist of the top member ofthe frame will result in lateral thrusts, which are mostlytaken care of by the shearing resistance of the bolts hold-ing the pedestal legs to the frame. Lateral stability is se-cured by corner gussets between transoms and frames, bythe fit of the transom channels riveted to the frame fillings,by end frames which are usually forged solid with the topmembers of the side frames and by width of section of the. FIG. 3.—EQUALIZED TYPE OF TRUCK FOR INSIDE HUNGMOTORS top members of the side frames. When forged transomsare used they are lipped over the top members of the sideframes and the gussets are omitted, 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 fr
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
