Importance

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Abstract

A chain and sprocket mechanism having a first sprocket, a second sprocket, and a chain engaged with the first and second sprockets, such that rotating the first sprocket moves the second sprocket via the chain. A tensioner is engaged with the chain between the first and second sprockets so as to apply tension to the chain. The tensioner is at least partly made of an elastic material, such as rubber or flexible plastic. The flexible material isolates the tensioner from vibrations, cushioning the tensioner and inhibiting the conduction of vibrations such as engine noise through the chain and the tensioner. The tensioner may be made partially or entirely of elastic material. The tensioner may be adjustable in a linear motion, to adjust the tension in the chain. The tensioning mechanism may be made so as to be mechanically simple, using translational motion only, without pivotal motion. The tensioning mechanism also may be functional without the use of springs or other elastic structures.

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First Claim