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RATCHET-TYPE MECHANISM OF A HOIST

A counterclockwise torque is applied about fixed axis A to ratchet wheel 1 to hoist load Q. Pawl 2 turns about fixed axis B and engages the teeth of wheel 1, preventing its rotation in the reverse direction and dropping of load Q. Pawl 2 is held in engagement with wheel 1 by spring 3.
$2773$RG,MH$