Model: 007 Chain Drives
This panel shows early and modern forms of chain drive, the later type on the right being the universally used chain. It is called the silent chain and has small rollers at the contact points, making an almost frictionless performance. The speed of the sprocket wheels is inversely proportional to the number of teeth. Therefore model 1 shows a speed ratio of 1 to 1 and model 2 a ratio of 2 to 1.
[Virginia Downward & William M. Clark, 1930]

[Editor's Note: Chain drive designs can be found in the drawings of Leonardo da Vinci in the Codex Madrid I. Look at KMODDL references to view on-line. FCM]

Francis Moon 2005-00-00

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