The Ratchet Wheel

Reference no 415
 

  When winding the watch the Barrel Arbor is rotated by a wheel called the Ratchet Wheel (415) attached to the Barrel Arbor with the squared hole as can be seen in the figure above. The Ratchet Wheel is driven by the Crown Wheel.

 
 
 

In the figure above it can be seen how the Click (430) interacts with, and locks, the Ratchet Wheel preventing the Mainspring from unwinding in an uncontrolled way. The figure also shows the Crown Wheel (420) and the Crown Wheel Ring (422) in place. The latter is a washer allowing the Crown Wheel to rotate freely as an intermediate power transferring wheel.

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