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N_Cook

On 20/11/2017 21:18, wrote:
On Mon, 20 Nov 2017 20:30:39 +0000, 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.
"Ball detent overload release" is one name for this type of clutch.
Eric

I'll go for that term. A similar sort of mechanism as the percussion
part of a percussion drill, hence the clattering noise when triggered.
In the gear train of a posket digital camera, jamming due to a silly bit
of plastic anti-dirt skirt, that has aged or degraded and gets between
the sliding barrel segments. So what sounds like a nasty slipped
gear/broken gear tooth, is designed-in noise