@Robert F Jarvis Possibly a large inner tube?We want to lift about 400lb about 6 inches. We were looking at a pneumatic bag. The ones I've seen require a commercial air pressure supply. Is there anything out there that would use for example a car tire foot pump? Or other ingenious ways to lift this weight?
Oooo! Now that is an idea. Thanks Ron
@Robert F Jarvis Further to the innertube method; You have to keep in mind the inner tube will expand sideways to avoid lifting a heavy load.Oooo! Now that is an idea. Thanks Ron
We want to lift a dead weight about 4 or 5" to be able to loop it around a bar and then drop it to apply tension . I bought a small commercial air bag to try this morning after Ron's inner tube idea up.I repeat: What is the "400 lb."? What is it resting on now? What are you going to set it on? 6" sounds like a couple strong guys, pry bars & some blocks. (Unless you're moving a big box from the floor to the grid. Then, maybe some rope & pullys.) 400# ain't rocket science, people!
The thread is getting long so answering myself here to thank all who contributed. This morning we are going to try out a small commercial hand pumped air bag. Even if doesn't work for this it will be a useful tool in the workshop.We want to lift about 400lb about 6 inches. We were looking at a pneumatic bag. The ones I've seen require a commercial air pressure supply. Is there anything out there that would use for example a car tire foot pump? Or other ingenious ways to lift this weight?
We want to lift a dead weight about 4 or 5" to be able to loop it around a bar and then drop it to apply tension . I bought a small commercial air bag to try this morning after Ron's inner tube idea up.
Oh my Lorde. I mean....just...run.... far away.OK, I'm pleading the 5th on this. Actually it's going to be two counterweights at 200lb apiece. One for each of two bars. They have a table for Young Frankenstein and Igor. They want to raise it about 4'. The bars will be counterweighted to hold table and two people. When it comes down and the folks get off we are gong to have to substitute their weight. There are two boxes with the weights (actually very well constructed) and they need a bit of spare room to be able to hook the box's cables over the bars. They were going to allow a bit of slack in the cables and then let the brake off so the bars snapped up to take the slack out! Not! Not with me any where near the stage anyway. So I suggested this simple way to lift the weights temporarily to hook the bars then allow the bag to deflate so tightening the cables with no slack to snap! Is it my idea to haul tables and people up? Heck no. I'm just the lighting guy - these guys are idiots as far as I am concerned.
But you are aware of it happening and have posted now, and are involved in it, right? So you're liable too. If I understand, when you say bars, you're talking about using 2 battens to lift this table? Bring someone in who knows how to do it right, or don't do it, there are a lot of variables to account for. What Rigger nailed it and is one of those people I'd trust without question when it comes to these kinds of things.OK, I'm pleading the 5th on this. Actually it's going to be two counterweights at 200lb apiece. One for each of two bars. They have a table for Young Frankenstein and Igor. They want to raise it about 4'. The bars will be counterweighted to hold table and two people. When it comes down and the folks get off we are gong to have to substitute their weight. There are two boxes with the weights (actually very well constructed) and they need a bit of spare room to be able to hook the box's cables over the bars. They were going to allow a bit of slack in the cables and then let the brake off so the bars snapped up to take the slack out! Not! Not with me any where near the stage anyway. So I suggested this simple way to lift the weights temporarily to hook the bars then allow the bag to deflate so tightening the cables with no slack to snap! Is it my idea to haul tables and people up? Heck no. I'm just the lighting guy - these guys are idiots as far as I am concerned.
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