. Railway mechanical engineer . Thesetables are made to show 60,000, 80,000 and 100,000 cars, both empty and loaded. Xo matter with what make, type or capacity of draft gear gear used was of the spring type, the cushioning valuebeing two M. C. B. class G springs having a combinedcapacity of 60,000 lb. By referring to the diagram you willnote that it required a fall of the hammer to closethe springs, at which time the pressure on the sills was ap-proximately 60,000 lb. In one instance it went up to 72,000lb. or an average of 12,000 lb. for each one inch fall of l
. Railway mechanical engineer . Thesetables are made to show 60,000, 80,000 and 100,000 cars, both empty and loaded. Xo matter with what make, type or capacity of draft gear gear used was of the spring type, the cushioning valuebeing two M. C. B. class G springs having a combinedcapacity of 60,000 lb. By referring to the diagram you willnote that it required a fall of the hammer to closethe springs, at which time the pressure on the sills was ap-proximately 60,000 lb. In one instance it went up to 72,000lb. or an average of 12,000 lb. for each one inch fall of lb. hammer. Selecting test No. 4 for comparison, it will be noted thatat the 14-in. fall of the hammer, the maximum strengthwithout over-straining the sills was reached, showing apressure of 1,025,000 lb. Deducting the 72,000 lb. pressuredevelo{>ed at the six-inch fall while the draft gear wasworking there remains 953,000 lb. pressure that was de-velojjed on the sills between the 6-in. and 14-in, falls, which 100,000 2OOp0O 300,000 400,000 700,000 800,000 300,000 1,000,000 1,100,000 /,200,000 Pressure in Pounds. Fig. 1âDiagram Showing Strength of Sills Obtained by Varying the Location of the Center Line of Draft. cars are equipped, the gear should at all times Ije workingas nearly to 100 per cent as possible if damage to cars andlading is to be avoided. The effects of shocks on cars areillustrated by the diagram, Fig. 1., presented herewith show-ing the results of a .scries of tests made in the Union DraftGear Companys laljoratory by Professor Endsley, assistedby Mr. Barnard, mechanical engineer of that tests were made to show the loss in the strength valueof the draft sills by moving the center line of draft l>clowor above the center of the channels. This diagram is shownin order to compare the difference in jjressures on the sillsbefore and after the draft gear is driven solid or all of the five tests sho
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
