. Railway mechanical engineer . be of 150,000 lb. capacity andthe Mechanical Committee later defined a 150,000 lb. ca-pacity draft gear in the following words: A 150,000 lb. draft gear should be defined as one thatwill sustain a drop of 16 in. (including travel of gear) of a9,000 lb. weight, without shearing the rivets of one or bothlugs, which are to be secured to suitable supporting membersby nine l/t in. rivets of .15 carbon or under, driven in 9/16in. holes. A representative number of gears of each type used cars were selected at random and subjected to theabove test. The averag
. Railway mechanical engineer . be of 150,000 lb. capacity andthe Mechanical Committee later defined a 150,000 lb. ca-pacity draft gear in the following words: A 150,000 lb. draft gear should be defined as one thatwill sustain a drop of 16 in. (including travel of gear) of a9,000 lb. weight, without shearing the rivets of one or bothlugs, which are to be secured to suitable supporting membersby nine l/t in. rivets of .15 carbon or under, driven in 9/16in. holes. A representative number of gears of each type used cars were selected at random and subjected to theabove test. The average of the results for each type was usedto determine whether or not that type of gear met the termsof the specifications. In these tests the gears were supportedupon a solid anvil and the weight was dropped from suc-cessive heights, increasing by 1 in. increments until the rivetssheared. In testing the Sessions K gears, the highest capacity gearssheared the rivets at a lower drop than .the lower capacity Rivet Value >>> * * 236,000 In. V Drop A- ■■ ■ . ool A Fig. 3—Diagrams of Rivet. Shearing Action of Draft Gears gears. In five instances the rivets sheared before the solidpoint of the gear was reached. In three instances the rivetssheared at the point of gear closure; and in but two instancesdid it require a blow from above the solid point to shearthe rivets. In three instances the rivets were sheared at apoint below the specification requirement when the successiveblows by 1 in. increments were given the rivets. In each ofthe cases, however, when the gear was again set up and asingle blow given from a height sufficient to produce a totalfall of 16 in. the rivets did not shear. Thus, one of thesegears, when given blows increasing by 1 in. increments,sheared the rivets at a total fall of 11 in., and when it wasimmediately thereafter given a single blow from a total fallof 16 in. the rivets were not sheared. The rivets in thisre-tes
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
