Pulley Help
Pulley Help
(OP)
I got shot a few times overseas which left me a Paraplegic in a wheel chair. Ive always been a 4x4 truck person Jacked up..I have a Cj7 Jeep on 38.5 swampers. Now even though i know i cant load the wheelchair up and go somewhere and get out, but i want to just drive it desperately. I need that freedom again. So how can i make a pulley system where i hang it and transfer over to like a swing set seat or something and pulley myself up to the jeep seat level, tie it off and transfer over to the seat?? Then go riding come home jum\p back into the pullet seat and lower myself down to wheelchair?? A while back before i was shot i had heard briefly about the guy who got into a car wreck leaving him in a wheelchair, he was a farmer,drove a big combine. Which are prob 15ft off the ground, he hung a pulley from one of the beams in the metal building that he kept the tractor under. So i know it can be done, i just have no idea how to do, how many pulleys i need,what kind of seat to use, if anyone can help me you have no idea what you will be doing. But it would change my life. Thanks to all.





RE: Pulley Help
I think a platform lift would be better than a cable hoist, since the cable hoist would not be stable.
Good luck to you.
RE: Pulley Help
Thank you! And good luck!
RE: Pulley Help
RE: Pulley Help
The biggest difficulty is making it reliable enough that it never drops you. With pulleys there is generally little friction, so if are the one supplying the lifting energy and you let go you would end up in free-fall, possibly doing a lot of damage on top of what you have now. Designs that aren't back-driveable, such as chain hoists, will take a very long time to lift you and set you back down because the drive ratio is so high. A lot of other equipment, like simple engine hoists, aren't built to prevent the user from accidentally damaging the payload.
I don't know if they reach as high as you like, but 'old-fashioned' bumper jack mechanisms are fairly safe - they are designed to avoid accidentally dropping the payload, requiring actual input to lower the vehicle, and are fairly efficient and linear for raising the load.
RE: Pulley Help
Say you weigh around 200 lb including weight of the sling etc. and are happy 'pulling' 50 lb for the duration needed to winch you up. In that case you'll need a block & tackle pulley ratio of 4:1 http://en.wikipedia.org/wiki/Block_and_tackle
If more specific solutions aren't available for persons in your situation then maybe look ingo 'bosun's chair' and rock climbing supplies. Maybe even overhead hoists would be a term worth googling though many of them won't be 'man rated'.
Make sure and include some kind of brake or equivalent in the system so that if you let go of the rope for some reason you don't come crashing down.
Also make sure what ever beam or structure you mount this on is adequate.
Jboggs idea is pretty good one, good luck.
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RE: Pulley Help
Link
Chris, CSWA
SolidWorks '15
SolidWorks Legion
RE: Pulley Help
The tricky part is probably the final bit of getting from hoist to the seat and vice versa.
(Accidentally posted this in the wrong forum yesterday)
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RE: Pulley Help
Warn ATV Winches
http://www.gowarn.com/?ppcfon=1&gclid=CNq5oeuT...
WARN PullzAll Handheld Cordless Pulling Tool — Red, 24 Volt, Model# 885005
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I hope you persevere and concur this obstacle! Keep your solution as simple as possible!
Walt
RE: Pulley Help
Walt
RE: Pulley Help
In a prior career I worked for a mobility company that made wheelchair lifts, ramps, etc for all types of vehicular access. If it moved or had wheels (planes, trains, and autos), we had a product for it. I don't think you want a manual pulley system as you don't want your hands to slip when you are 3-4ft off the ground I'd go with an electrically powered winch that you could control with a pendant. Better yet, but more expensive, would be a hydraulic system. The benefit of a hydraulic system is they allow for quicker manual operation should you experience an equipment failure, where an electric system usually takes many turns of a crank as is much slower. In both cases you probably wouldn't be able to manually operate the lift by yourself during a failure.
As for transferring from your chair to the Jeep seat, have you considered removing the seat entirely? If you are the sole operator, this may be more accessible for you, if your vehicle has the head room to accommodate you and your chair. All you would have to add would be some sort of restraint system designed for your chair. http://www.qstraint.com/ comes to mind as an option. Do you already have hand controls installed for your Jeep?
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RE: Pulley Help
RE: Pulley Help
Mike Halloran
Pembroke Pines, FL, USA