On Monday, November 20, 2017 at 3:30:40 PM UTC-5, N_Cook wrote:
A sort of slip clutch in a gear train that transmits torque until ther
is a jam. Then at a preset back-torque a "ratchet" mechanism engages
making a clicking noise as the drive side turns relatively freely to
protect a motor etc and alerts a user to a problem.

That's how a torque wrench works, but I don't know the name of the mechanism.