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FRICTION-RACK RATCHET MECHANISM

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Toothless rack 1 can slide in fixed guide a to the right. Link (pawl ) 3 turns about fixed axis A and is connected by turning pair B to shoe 2 with serrations b. With sufficient friction between the serrated surface of shoe 2 and the top surface of rack 1 the shoe prevents motion of the rack in the reverse direction.
$2664$RG,3L$

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Documents: Gear mechanisms  [Streambook]
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