. Report of draft gear tests, United State Railroad administration, Inspection and test section; . on elements being loose when the gearis first applied. This gear has a frictionspring value of approximately 23,000 separate release springs are used. Each gear consists of eight parts, fourof which are subject to wear. Wear of theparts cannot be taken up except by re-newal of parts. The gear is not self-contained but will fall apart when removedfrom the car. But little fitting or grindingis done in the manufacture of this gearand it is usually shipped loose, to be as-sembled in the car. Th
. Report of draft gear tests, United State Railroad administration, Inspection and test section; . on elements being loose when the gearis first applied. This gear has a frictionspring value of approximately 23,000 separate release springs are used. Each gear consists of eight parts, fourof which are subject to wear. Wear of theparts cannot be taken up except by re-newal of parts. The gear is not self-contained but will fall apart when removedfrom the car. But little fitting or grindingis done in the manufacture of this gearand it is usually shipped loose, to be as-sembled in the car. The friction area ofthe gear increases as it is compressed andthe solid blow is delivered upon the samemetal that receives the friction load. 10 Draft Gear Tests of the U. 5. Railroad Administration The normal length of this gear is 20y8in., requiring two 2*4 in. followers witheach gear. The average weight of one gearis 252 lb., or 504 lb. per car, to which must friction springs, having a combined valueof 30,000 lb. These springs are gradu-ated, the inner coils being shorter than theouter Fig. 4—Sessions Type K Gear be added for comparative purposes, fourfollowers per car, weighing 71 lb. each,giving a per car weight for this gear of788 lb. Sessions Jumbo Gears No. 13, 14 and 15 This is a heavier gear, and of 3 in. nomi-nal travel, recently developed by theStandard Coupler Company. In general,it follows the same principle of wedgeblocks as the older Type K gear of thiscompany, there being changes, however,in the angles of the wedge blocks. Thegear also includes both followers, being24% in. nominal length. The friction box is of drop forged steeland the spring barrel of cast steel with aclosed bottom. There are six double coil The friction box, spring barrel, springplate and center friction block are heldtogether as a self-contained unit by meansof a rivet and key arrangement. The sidefriction blocks and the follower are loose,however, so that the gear is not entirelysel
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