Automatic chain tensioner
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United States of America Patent
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Feb 27, 2001
Grant Date -
N/A
app pub date -
Sep 1, 1998
filing date -
Sep 1, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
The drive-chain tensioner is automatically self-adjusting. A chain-slipper is guided to follow wear-movement of the chain. A cam is mounted on the follower. If slack in the chain increases, the cam is rotated by a cam spring to a position in which a larger radius of the cam lies under the follower. The cam provides a solid abutment that prevents the chain from compressing the tensioning springs and becoming slack when drive is reversed. For compactness and good load distribution, the chain is supported on a saddle between two cams. The cams have ratchet teeth.
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