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Name the mechanism shown and explain how it operates - Leaving Cert Engineering - Question m - 2010
Question m
Name the mechanism shown and explain how it operates. The diagram shows a ratchet and pawl mechanism which will only rotate in an anticlockwise direction.
Worked Solution & Example Answer:Name the mechanism shown and explain how it operates - Leaving Cert Engineering - Question m - 2010
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Explain how it operates
Answer
A ratchet and pawl mechanism is used to permit rotation in one direction only. In this case, the ratchet rotates anticlockwise. As the ratchet turns, the curved surface engages with the pawl allowing it to lift. However, when the ratchet rotates clockwise, the pawl is pulled back by a spring, preventing backward movement.
This mechanism is commonly employed in tools such as ratchet spanners, fishing reels, and ratchet screwdrivers. It allows for continuous movement in a single direction while maintaining a secure hold against reversal.