A chain tension relieving device which prevents excessive tension being applied to a tension run of a chain. A shoe (5C) engages a tension run (3B) of a chain (3) stretched between a driving sprocket (1) and a driven sprocket (2) from another side of the chain in a bowed portion of the chain (3). When...http://www.google.sh/patents/US6050914?utm_source=gb-gplus-sharePatent US6050914 - Device for releasing the tension in a mechanical tensioner for a chain
