Pitman rod

Pitman rod

Connecting rod used to convert from rotation to reciprocating motion. A Pitman rod was used, for example, on a mowing machine to drive the reciprocating sickle bar. They were generally made of wood so that if there were a jam, the wood (easily replaceable) would break before any of the other machinery was bent or broken.
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Note: A pitman rod is a device by which lateral motion is converted to rotary motion, or vice versa.