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.
In my imagination, I see a differential, with one output driving the load, and the other driving a bell, but secured with a brake.
Or, a shaft coupling with a shear pin, which makes a fuss when it breaks. Maybe a shear pin with a stinky mercaptan center?
Overload clutch?
Jon
"Ball detent overload release" is one name for this type of clutch. Eric
AKA "Ball Torque Limiter".
Peter Wieck Melrose Park, PA
Depending on how much torque you are talking about the ICE bubble hockey arcade games use a nylon slip clutch in their player gearboxes. This releases if the men are jammed and makes a ratcheting sound. They do wear out, but last years and they sell for around $15 for the entire gearbox.
number SC3012X
John :-#)#
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Over-running clutch?
No, an overrunning clutch allows it to slip in one direction and grab in the other. That is a different mechanism used for a different purpose.
Jon
Like a bicycle freewheel.
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
We used to use this type of clutch in linear actuators in some of our machi nes, I think we may have called them torque clutches or ratcheting clutches . The ratcheting noise proved unacceptable to customers. We developed circu itry to detect the stall current of the motor and controlled the actuator t ravel that way, rather than thru brute force timing.
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