Resistance pulley - Does this exist?
Resistance pulley - Does this exist?
(OP)
I am in the process of inventing a new water sport that uses a rope rigging system. I am trying in vain to find a mechanism that applies resistance onto a rope that is passing through the system.
What I have now is a pulley that allows the rope to pass through freely, with no friction or resistance. I want the rope to pass through the pulley at a slower rate, perhaps 35% slower. Is there such a pulley (or other mechanism) out there that simply applies resistance on a rope? What comes to mind is what you see on a chairlift, where the wire cable passes between two sets of wheels. I need a miniature version of this (one wheel on top, one below) with the rope passing through and getting squeezed to slow its movement either direction. Right now, with the rope free flowing, the system is fouling up due to un-regulated rope movement. Does anyone have an idea of where to look for this type of item? I've been searching now for 2 weeks with nothing found in the climbing or safety gear industries. Any help would be greatly appreciated.
What I have now is a pulley that allows the rope to pass through freely, with no friction or resistance. I want the rope to pass through the pulley at a slower rate, perhaps 35% slower. Is there such a pulley (or other mechanism) out there that simply applies resistance on a rope? What comes to mind is what you see on a chairlift, where the wire cable passes between two sets of wheels. I need a miniature version of this (one wheel on top, one below) with the rope passing through and getting squeezed to slow its movement either direction. Right now, with the rope free flowing, the system is fouling up due to un-regulated rope movement. Does anyone have an idea of where to look for this type of item? I've been searching now for 2 weeks with nothing found in the climbing or safety gear industries. Any help would be greatly appreciated.





RE: Resistance pulley - Does this exist?
RE: Resistance pulley - Does this exist?
This brake could be a fluid or viscous arrangement as well as centrifugal/frictional. This brake might apply significant torsional loads to whatever it is attached, but two similar contra rotating pulleys could balance this torque out.
One problem I can see, is you mention water-sports ? Braking a rope or anything else requires friction to be developed somewhere. Things might change rather dramatically and suddenly between the wet and dry condition.
RE: Resistance pulley - Does this exist?
Related: Thread406-55486
See www.dictator.de, look for rotational dampers. There are more suppliers like this.
Regards,
Pekelder
RE: Resistance pulley - Does this exist?
http://www.ogura-clutch.com