Name for a mechanism

[N_Cook]

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.

 

[Tim R]

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.

 

[whit3rd]

On Monday, November 20, 2017 at 12:30:40 PM UTC-8, 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 ...

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?

 

[Jon Elson]

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.
Overload clutch?

Jon

 

On Mon, 20 Nov 2017 20:30:39 +0000, N_Cook <diverse@tcp.co.uk> 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

 

[pfjw@aol.com]

On Monday, November 20, 2017 at 4:12:20 PM UTC-5, et...@whidbey.com wrote:

"Ball detent overload release" is one name for this type of clutch.
Eric

http://www.directindustry.com/industrial-manufacturer/ball-torque-limiter-148825.html

AKA "Ball Torque Limiter".

Peter Wieck
Melrose Park, PA

 

[John Robertson]

On 2017/11/20 12:30 PM, 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.

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.

https://www.icegame.com/category/22/super-chexx#parts

number SC3012X

John :-#)#

--
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MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3
(604)872-5757 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."

 

On Monday, November 20, 2017 at 2:30:40 PM UTC-6, 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.

Over-running clutch?

 

[Jon Elson]

tschw10117@gmail.com wrote:

On Monday, November 20, 2017 at 2:30:40 PM UTC-6, 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.

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

 

[Tim R]

On Monday, November 20, 2017 at 10:19:06 PM UTC-5, Jon Elson wrote:

tschw10117@gmail.com wrote:

On Monday, November 20, 2017 at 2:30:40 PM UTC-6, 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.

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.

 

[N_Cook]

On 20/11/2017 21:18, etpm@whidbey.com wrote:

On Mon, 20 Nov 2017 20:30:39 +0000, N_Cook <diverse@tcp.co.uk> 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

 

We used to use this type of clutch in linear actuators in some of our machines, I think we may have called them torque clutches or ratcheting clutches.. The ratcheting noise proved unacceptable to customers. We developed circuitry to detect the stall current of the motor and controlled the actuator travel that way, rather than thru brute force timing.