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RATCHET-TYPE RACK MECHANISM OF A HOIST

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An upward force is applied to ratchet-tooth rack 1, sliding along fixed guides a-a, to hoist load Q. Pawl 2 turns about fixed axis A and is held in engagement with the teeth of rack 1 by spring 3. Downward motion of rack 1 (and dropping of load Q) is prevented by pawl 2.
$2768$RG,MH$

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Documents: Gear mechanisms  [Streambook]
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