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Old 08-20-2007, 05:05 PM   #1
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Weight of a hard top

Hey everyone,

I'm in the process of making a hard top hoist for my garage. I need a couple pointers as well as how much the top weighs. Umm 97 wrangler full hard top. I'm going to be using some pullies and about 50' of steel cord for one man lifting operation. I need to see what you folks think about hanging everything from one location ie lag bolt or really strong eye bolt through a 2x4 (thoughts?)

Thanks for reading and responding. Everytime I post I always get great responses.

Thanks

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Old 08-20-2007, 05:08 PM   #2
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The last time I removed mine I'd say it had to be in the 150 to 175# range.

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Old 08-20-2007, 05:41 PM   #3
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Mopar specs say 145lbs.
I have a powered hoist hanging from my garage ceiling. Used the larged eye bolt I could find to attach the pully to. Ran the eye bolt through a 2x10 in the attic (horizontally) and then attached the pully to it with a link so it would drop down into the garage just below the ceiling. I've hoisted the top and let it hang indefinitely with no problems or even the slightest movement of the eye bolt.
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Old 08-20-2007, 09:18 PM   #4
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I had a cj hard top. All you need is to raise the top an inch or two. Back into the garage and with a pulley set up hoist it up and drive out. Back in and lower it back in place. I plan on doing the same with the new one if it ever gets here. It can be a 1 person job, my wife likes riding with the top off but is not happy helping with the labor. Good luck!
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Old 08-21-2007, 09:47 AM   #5
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Once again my fellow jeepers have come through!!!!
I just needed the wieght for breaking strength on the cord, pullies and eye bolt.

Another question for the math/physics lovers out there. If my eye bolt is strong enough and I use 2 125lb pullies does that mean the two pullies can hold 250 lbs? I know that the eye bolt will support all the wieght but I want to make sure that the two pullies I have don't give out in mid hoist. (125lb pully is the biggest I can find at home depot)

The lay out of steel cord will look like this


Roof
------------------------
eye bolt ! /O\ 125lb pully
l / \
l / \ pully O/ \ clamp on the wall to tie off cord
____i______
hard top
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Old 08-21-2007, 09:48 AM   #6
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Ok when I made the diagram (in the Reply window) it looked fine!!
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Old 08-21-2007, 10:04 AM   #7
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That's a little better
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Old 08-21-2007, 10:56 AM   #8
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nope b/c that puley on the hard top there is getting all 145 #'s pulling up on it/down
you wil need to find heaveir duty onesor another two and make one on eather side of the top, this way it will stay balanced as well
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Old 08-21-2007, 12:19 PM   #9
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Not sure. I do know, if you were to use a rope hoist, every time the rope circles back onto another pulley, it "reduces" the load by a certain %, which translates into less pull effort on your end, which translates into less load on all components - with the exception of the primary eye hook which will still only be supporting the weight of the top and the pulley hoist under the above circumstances. Sorry couldn't be of more help.
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Old 08-21-2007, 01:24 PM   #10
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I'm just theorizing but...... wouldn't the Eye bolt have to take on all 145lbs + hardware and that each pully would take on half the weight......Or am I way off?????
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Old 08-21-2007, 01:25 PM   #11
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Damn It!!!!!!

Calling All Engineers!!!!!

Ha Ha
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Old 08-21-2007, 01:52 PM   #12
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This is a little bigger and there for better...


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Old 08-21-2007, 02:00 PM   #13
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the eye bolt and top pully will each support half of the hartop
the pully attatched to the ahrtop will suppoert the whle weight

you will have to pull on the rope with 1/3 the weight of the hard top
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Old 08-21-2007, 02:30 PM   #14
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Debruins nailed it. 1/2 weight at eyebolt, 1/2 weight at top pully. The pully attached to the top will support 100% of the weight. The tension on the rope will be 1/3 the weight of the top at any section of rope and will require just 1/3 the weight of the top in pulling force to move the top. The tradeoff is that you must move your arm 3 inches for every 1 inch of movement in the top.

The best design is to mount the double pulley system like so.
Click image for larger version

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With this design, the pulley at the top is now holding 100% of the weight instead of 1/2 so it is up to you.
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Old 08-21-2007, 02:34 PM   #15
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debruins.... Thanks....Looking at the diagram, that now makes sense....

Also I have to give myself some props .... I made a hell of a drawing from microsoft paint...
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Old 06-05-2008, 02:28 PM   #16
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How do you attach a harness to the Hard Top?

Just wondering how you get the top off. I understand the lift and puley setup but was wondering if you using a moving strap or 2 to attach to the lift since I don't want to scratch the top. Hope someone is around since this search yielded results from along time ago.
By the way I jsut got my 99 Jeep wrangler in niiice condition, low mileage from a guy in Iraq who could not drive it for a few years. HE reupped and sold it for the money.

TIA,
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Old 06-06-2008, 08:14 AM   #17
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you can see pics of my setup here.... http://smg.photobucket.com/albums/v2...rdtop%20Hoist/

should give an idea of how the whole thing works.
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Old 06-06-2008, 12:05 PM   #18
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Thanks. A picture's worth a 1000 words

that puts it in to perspective for me. Where did you get the bars and how much was it to weld them? Thanks again. That's a great setup you have there.
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Old 06-06-2008, 01:41 PM   #19
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i got the square tube at tractor supply, but i have seen it at home depot too. the welding (if you want to call that slop welding) was free from someone at work. if you took the stuff to a welding/fab place, they probably wouldn't charge you anything for it if they were cool, otherwise expect someone to charge you an hour's shop time fee (~$20-$50). i certainly wouldn't want to pay someone to do it. it was only a matter of 4 passes, maybe being 12" in total weld.

doing that part over again (which i probably will if i get a LJ or a JK next), i would actually just get more of that "uni-strut" metal stuff i used to hang the hoist with in the attic. they have a bracket that joins two pieces together to make a "T", and the holes in the strut would be even easier to hang the hooks from.

the straps i used worked really well, but having two more of the hooks like i used for the back part would be even faster and easier to use. i couldn't use them though b/c the square tube did not come long enough to reach the sides. the straps were a good solution, but #2 version will be wider.

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