. Report of draft gear tests, United State Railroad administration, Inspection and test section; . hat should wear equivalent to % movement occur, the wedging ac-tion would cease except for a slight amountresulting from the tapered ways of thebarrel. After this the gear would be sub-stantially a spring draft gear. The gear has a friction spring value of19,500 lb. and an additional independentrelease spring value of 6,000 lb. The pre-liminary spring has an active value of14,800 lb. The friction area of this gear no additional metal being presented forthis load. The nominal length of
. Report of draft gear tests, United State Railroad administration, Inspection and test section; . hat should wear equivalent to % movement occur, the wedging ac-tion would cease except for a slight amountresulting from the tapered ways of thebarrel. After this the gear would be sub-stantially a spring draft gear. The gear has a friction spring value of19,500 lb. and an additional independentrelease spring value of 6,000 lb. The pre-liminary spring has an active value of14,800 lb. The friction area of this gear no additional metal being presented forthis load. The nominal length of the gear is 20%in., so that two followers of 21/4: in. thick-ness are required for it. The gears asfurnished weigh on the average about 200lb. each, or 400 lb. per car, to which mustbe added for comparative purposes fourfollowers per car, weighing 71 lb. each,giving a per car weight for this gear of684 lb. Westinghouse Type NA-1 Gears No. 4, 5, 6, 7 and 8 This new gear of the Westinghouse AirBrake Company is made with a cast steelbarrel of rectangular cross-section. The V//////M V///^///y-//AA. Fig. 3—Westinghouse NA-1 Gear increases as the gear closes, additionalmetal of both the moving and the stationaryelements coming into contact. The solidblow on this gear is carried by the samemetal that resists the frictional movement, friction elements comprise one series ofstationary plates and another series of rela-tively movable plates alternating there-with, the plates being loaded through aset of central wedge members. Four fric- Draft Gear Tests of the U. S. Railroad Administration tion springs are used, in addition to onecentral release spring. All five of thesprings are duplicate and the gear has afriction spring value of approximately17,000 lb. plus an additional release springvalue of approximately 4,300 lb. This gear has an absolute free length of23-7/32 in. and is held to a compressednormal length of 22% in. by means of akey arrangement. The gear is thus underan initial c
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