. Railway mechanical engineer . on under all conditions of collision impact,it is generally recognized that anything which will tend tohold the underframes in the same horizontal plane will exerta powerful influence in the prevention of telescoping, theform of destruction usually responsible for the greatest lossof life in train accidents. The use of a locked center pin as a means of resisting thetendency of one underframe to climb over the top of anotherhas received considerable recognition and at least one self-locking center pin has been developed. The locked cen-ter pin is effective only s
. Railway mechanical engineer . on under all conditions of collision impact,it is generally recognized that anything which will tend tohold the underframes in the same horizontal plane will exerta powerful influence in the prevention of telescoping, theform of destruction usually responsible for the greatest lossof life in train accidents. The use of a locked center pin as a means of resisting thetendency of one underframe to climb over the top of anotherhas received considerable recognition and at least one self-locking center pin has been developed. The locked cen-ter pin is effective only so long as it holds thetruck and car body together. The self-locking type is opento the possible objection that the full area of the pin sec-tion is not available to resist tension or shearing therefore under certain conditions might not be as ef-fective in preventing a separation of the truck and carbody as a pin of solid section. These considerations have led to the design of the center -^msfeel Spring Lock Washer. Buiit-Up Pedestal for Pullman Trucks pin sliown in one of thi drawings. The pin is a forged steelIjolt four inches in diameter with a shallow hexagonal headand a square nut of special design. The head sets in ashallow hexagonal socket at the bottom of a pocket in thecenter sill filler casting. The nut is placed in a square re-cess in the under side of the truck bolster and two %)olts applied througli flanges of the bolster casting hold itin position wlien the center pin is not in iilacc. In applyingtlie bolt it is dropped in place and screwed into the nut, 592 RAILWAY MKCHAXKAl. V.)i,. 94. No 9 which is held in sufficiently close alinement by the squarerecess in which it is placed to prevent any difficulty instarting the threads. When drawn up as far as it is possi-ble to turn the bolt, the head is brought into register withthe socket and dropped in. This locks the bolt and nutexcept for the slight turning of the nut due to the curvingof
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
