mechanically operatable shaft mounted coupling for light load; shift at no load
mechanically operatable shaft mounted coupling for light load; shift at no load
(OP)
Need an inexpensive coupling to engage/disengage shaft mounted sprocket from 1/2"shaft when idle, foot operated load. application shown on attachment.





RE: mechanically operatable shaft mounted coupling for light load; shift at no load
RE: mechanically operatable shaft mounted coupling for light load; shift at no load
Walt
RE: mechanically operatable shaft mounted coupling for light load; shift at no load
When it comes to couplings we are always here to help.
WWW.PSCCOUPLINGS.COM
RE: mechanically operatable shaft mounted coupling for light load; shift at no load
Walt
RE: mechanically operatable shaft mounted coupling for light load; shift at no load
RE: mechanically operatable shaft mounted coupling for light load; shift at no load
Mike Halloran
Pembroke Pines, FL, USA
RE: mechanically operatable shaft mounted coupling for light load; shift at no load
That is the exact description of what a freewheel or freehub does.
It looks like you are driving a hub off the pedals of the bike. Your rear wheel has a free wheel in the hub or sprocket, that allows that rear sprocket to sit idle while the rear wheel is moving. You need the same thing on the out side of your pedals before the hub. The only way this won't work is if you are trying to drive torque in both directions. (forward and reverse)
When it comes to couplings we are always here to help.
WWW.PSCCOUPLINGS.COM
RE: mechanically operatable shaft mounted coupling for light load; shift at no load
RE: mechanically operatable shaft mounted coupling for light load; shift at no load
RE: mechanically operatable shaft mounted coupling for light load; shift at no load
RE: mechanically operatable shaft mounted coupling for light load; shift at no load
I'll bet that you can find one with the actuation fork ready made.
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P.E. Metallurgy, Plymouth Tube
RE: mechanically operatable shaft mounted coupling for light load; shift at no load
RE: mechanically operatable shaft mounted coupling for light load; shift at no load
I am mildly confused by your statement, the purpose of a freewheel is to ALLOW for relative motion in one direction, not prevent it. Otherwise you would just use a rigid coupler. Maybe just semantics, but there are a lot of ways to prevent relative motion.
WALT1A,
based on the fact you don't want the action to lock when the bike is pushed backwards, orient the freewheel so that direction is not impeded. Seems to me you have a one directional torque application, since you don't want torque transmitted in the backwards direction of rotation.
When it comes to couplings we are always here to help.
WWW.PSCCOUPLINGS.COM
RE: mechanically operatable shaft mounted coupling for light load; shift at no load
Allowing relative motion in one (and only one) direction is the same as preventing it in one (and only one) direction. Philosophically, is a freewheel the thing that lets you coast...or is it the thing that lets you go? You imply that a freewheel replaces a rigid coupling to enable coasting. I counter that the freewheel replaces NO coupling to enable going.
If you have a bike with a freewheel, go push it backwards. The crank will turn backwards, too. Perhaps you do not doubt this.
Any input to either the wheel or the crank that tends to tension the top span of the chain will give a rigid connection, no freewheeling. It must be. Putting any freewheel into the system that prevents tensioning that top span, well, prevents tension in the top span. Of course, no tension there means no ability to go. As I said above, the freewheel has no notion of which direction the chain is moving. There's no such thing as backwards or forwards.
RE: mechanically operatable shaft mounted coupling for light load; shift at no load
RE: mechanically operatable shaft mounted coupling for light load; shift at no load
RE: mechanically operatable shaft mounted coupling for light load; shift at no load
When it comes to couplings we are always here to help.
WWW.PSCCOUPLINGS.COM
RE: mechanically operatable shaft mounted coupling for light load; shift at no load
https://patents.google.com/patent/US6206164B1/en
Walt
RE: mechanically operatable shaft mounted coupling for light load; shift at no load
RE: mechanically operatable shaft mounted coupling for light load; shift at no load
https://www.google.com/patents/US8215645
I tried to find a patent with that date; not much luck due to a detour to http://wheelbike.blogspot.com/search/label/patent about the hundreds of ways people have tried to improve bicycles by finding the same solutions that didn't work before.
RE: mechanically operatable shaft mounted coupling for light load; shift at no load