Self adjusting tensioning device for endless chain using biased ratchet and pawl arrangement

摘要

In order to adjust an endless chain 458 self adjusting device 450 consists of a primary block 466 mounting a steel compression plate 468 which with a threaded fastener (not shown) can be compressed to hold member 460 in place. On releasing plate 468 a biasing spring forces ratchet teeth past pawl 476.