Pawl

For other uses, see Pawl (disambiguation).
A ratchet and pawl mechanism
A parking pawl in an automatic transmission

A pawl is a movable lever that engages a fixed component to either prevent movement in one direction or restrain it altogether. As such, it is a type of latch and can also be considered a type of dog. It typically consists of a spring-loaded lever that engages a mating component at a steep enough angle to restrain it. Pawls are often tapered, being widened at their pivot for anchoring and narrow at their tip.

Applications

Anchor windlass
A pawl is used in an anchor windlass to prevent a free-spooling chain by grabbing and snubbing an individual link. Similar mechanisms include a Devil's claw, or a claw and dog.
Ratchet
A pawl is used in combination with a ratchet gear in socket wrenches, bicycle freehubs, winches, ratchet reels for diving, fishing, and many other applications.[1][2]
Ladder
Dogs (in the form of pawls) are used on extension ladders to temporarily anchor their sections to one-another.[3]
Table saw
Pawls are used on table saws to prevent a workpiece being sawn from kicking back.[4]
Transmission
A parking pawl is a device in an automobile automatic transmission which prevents it from moving when the vehicle is parked .[5]
Revolvers
The hand (pawl) indexes the cylinder.

References

  1. ^ Nitaigour Premcahnd Mahalik, Mechatronics: Principles, Concepts and Applications, p. 271, Tata McGraw-Hill Education, 2003 ISBN 0070483744.
  2. ^ Richard Krolak, Cruising World, "Servicing your winches", April 1990, pp. 107-108
  3. ^ International Association of Fire Chiefs, Fundamentals of Fire Fighter Skills, p. 363, Jones & Bartlett Publishers, 2012 ISBN 1449666507.
  4. ^ Table Saw Techniques: Use Your Saw Like a Pro, p. 12, Quarto Publishing Group USA, 2003 ISBN 1610602951.
  5. ^ Keith Santini, Kirk Vangelder, Automotive Automatic Transmissions and Transaxles, p. 174, Jones & Bartlett Learning, 2017 ISBN 1284122034.

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