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need a 110V winch
Frank, a 6k load is a LOT to hang on a cable, might be a better deal to find an old used forklift.
As for a winch itself though, we use a regular 1/2 hp. motor into a lovejoy coupler, then into a 90° deep reduction gearbox that then chain drives a pulley to lift the hangar doors. I don't know the weight exactly, but I can tell you a 45' wide, 16' high door is hefty!! It lifts it without even thinking about it.
Best of luck.
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need a 110V winch
Frank, you're on the right track, but if I may offer a little suggestion.
Use two cables.
Figure out some way to have the winch hold two cables on the drum and have the other ends terminate separately on the fixed point of the mechanism. This way if one cable lets go for some reason the other will prevent a sudden drop.
I would also suggest you figure out some simple ratchet mechanism with spring loaded arms on the lift platform and ratchet stops or dogs on the wall that the lift climbs and a pull string to release them. That way when the lift stops the weight is not sitting on the cable (which will be springy) and in the event of a catastrophic failure of the lift, the load is held before your "Butt Head" helmet gets tested. 
Best of luck.
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need a 110V winch
Jeff, wouldn't that be marbles between the fingers, not in the mouth?
You surprised me too, I figured you'd make some crack about insurance people not being too clear.
But I'm jiss' sayin's all.......
Best of luck.
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need a 110V winch
Frank, a 'safety mechanism' doesn't have to be rocket science.
Although I wouldn't want to stake my licence on it, as an Engineer I can tell you, a couple of stout hardwood beams with ratchet dogs carved into them, and a pair of ratcheting bars that engage the dogs on the beam would be more than enough to do the trick and only let the car drop as far as the last dog the ratcheting bar slid over, maybe a couple of inches at most.
My suggestion would be two horizontally opposed hardwood planks under the car, sliding back and forth in a track in the center of the car with a spring between them pushing them outwards and into the notched beams.
Of course I still stand by my original suggestion too. For about the same cost as fabricating an elevator you buy a used forklift that would be useful for far more than just getting stuff up and down off the mezzanine.
Best of luck.
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need a 110V winch
Joel, I understand what you're saying about space, but think you're missing a few salient facts.
In the original post Frank said "I'm in need of a 110V winch that will lift 5-6000 lbs. in a reasonable amount of time.".
My first thought is that unless Frank's in better shape than me he's going to need a forklift or something similar to it just to load the lift itself. I doubt too many here are up to humping 5-6k pounds around by hand anymore.
Secondly, I doubt a forklift would be any larger in footprint size than an elevator would be.
Finally, a forklift can be stored elsewhere and not take up 'prime' storage space, an elevator is sort of tough to move around.
Best of luck.
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need a 110V winch
We do something similar, but the pallet jack permanently resides on the mezzanine and there is a shelving unit that stands against the wall where the lifting is done. When something has to go up or down that is too heavy to be moved by hand, the shelf unit is carried out of the way with the forklift, and the stuff moved up or down, then the shelving put back.
We can't afford to waste that much space by having a permanent elevating device taking up room that can't be used for anything but moving heavy stuff up & down on rare occasions. The commonly used stuff is all on grade, the only stuff upstairs are long term storage, light stuff, and the bulk tanks for oil, & etc.
Besides, in Ontario, as in most every other jurisdiction in North America, a permanently installed elevating device has to by approved by the Government as well as UL or a comparable safety authority. Lot's of hoopla for naught.
Best of luck.
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need a 110V winch
Joel, I think you will find that ANY lifting device is required to be certified as safe by UL or others.
The licensing of passenger elevators is a whole other matter.
In my case the few square feet of floor space was worth far more than the $1,500 I paid for the forklift, the additional uses are just a huge bonus over & above getting stuff to & from the mezzanine level.
Best of luck.
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