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A ratchet is a mechanical device that allows continuous linear or rotary motion in only one direction while preventing motion in the opposite direction. A ratchet may be on a drive shaft and the ratchet is there to stop the shaft  from reversing by the action of the ratchet pawl falling into the gap between 2 ratchet teeth when the drive motion ceases. Conversely, the ratchet can be driven by the ratchet pawl if it is oscillating back and forth. The ratchet pawl will have to move at least 1 circumferential pitch of the ratchet wheel for this action to take place.

Just a few applications for the use of ratchets are in machinery, tools, capstans on ships, clocks, jacks, turnstiles and handcuffs.

Our maximum diameter is 500mm (19.625 inches) * 100mm (4 inches) face width.


Hewitt & Topham Limited, Dyneley Road, Greenbank Business Park, Blackburn BB1 3AB United Kingdom
Tel: +44 (0) 1254 679222  Fax : +44 (0) 1254 680534  Email: sales@hewitt-topham.co.uk


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