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| telescopic umbrella |  | ||
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| Posted by: pianoman ® 01/24/2011, 23:30:41 Author Profile eMail author Edit |
Goodday folks how is everyone today?
Just a small question regarding an umbrella. We turned our backyard into a little resort and i came up with this crazy idea. We built a 16 foot umbrella which we want to telescopic out from under a roof to go over a pool. the umbrella weighs 148 lbs complete .we got the approval from the truss company to hold the umbrella and the weight of the two beams. We were going to use a 3 inch sq tubing x.188 mil wall x 16 feet long and have a 2 and a half inch sq tubing x .188 mil wall slide inside to move the umbrella in and out,we wanted to thatch this umbrella and to store it under the main roof when it rains ,to give it a longer life span.It also would never see snow as well. what i was going to do was to put a 1\4 inch slot on both sq tubing for 9 feet and attach the umbrella with four rollers that would slide inside . So with both pieces closed up the umbrella would be in the middle and totally under the roof ,then i would need the inside sq tubing to slide out for eight feet and the umbrella slide for 16 feet ,this would bring the umbrella to the center of the pool.I was gonna use a 3000 lb wench to bring this inside sq tubing in and out Do you think that this 2 and a half inch square tubing sticking out for eight feet hold a 148 lb umbrella safely? thks again and i hope to hear back from you john Kutcher |
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| Posted by: dalecyr ® 01/25/2011, 01:57:57 Author Profile eMail author Edit |
Perhaps a picture would help. If I understand you correctly, the 1/4" slot would run
This would turn the tube into something more like an upside down
Modified by dalecyr at Tue, Jan 25, 2011, 01:59:26 |
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| Posted by: pianoman ® 01/25/2011, 17:35:58 Author Profile eMail author Edit |
Hey guys thks for the quick response,
This 3x3 and 2 and half inch square tubing would have the slot on the bottom of each piece, so when i move out the inside piece for eight feet i would be able to move the umbrella 16 feet total.this would be enough to put the umbrella right on the center of one end of the pool. I was thinking of putting four rollers that would slide on the inside of the inner square tubing that would be mounted or fixed on the top center of the umbrella. I got the ok for the weight of the two square tubings to hang from the center of the trusses And yes very much like a barn door also i was going to use a dripless grease on the two sq tubing to make for easier sliding. I was going to send you a pic but they are bigger than 120kb or if you know how i could shrink or compress these pics id be glad to send you something thks again John |
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| Posted by: pianoman ® 01/26/2011, 21:45:26 Author Profile eMail author Edit |
Ok I think I got it now ,I emailed it to myself and it asked if i wanted smaller so here it is ,any question feel free
Thks guys John
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| Posted by: Pinkerton ® 01/25/2011, 09:48:28 Author Profile eMail author Edit |
John, I am with Kelly, a pic or sketch please. Dave |
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| Posted by: pianoman ® 01/26/2011, 18:46:44 Author Profile eMail author Edit |
Well i tried to draw you a pic and i scanned it but its over the 120 kb ,don't know how to make it smaller
actual size is 750 kb so not sure how to make it smaller in kb ill talk to my son when he gets home THKS |
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| Posted by: pianoman ® 01/26/2011, 22:55:43 Author Profile eMail author Edit |
Wow now that I figured out how to shrink a pic here is another to show you kinda what Iam trying to do with this umbrella
We want this umbrella to telescopic out from the center of this roof to go over one end of this pool also if you think that this 2 and a half sq tubing would hold the weight .Or if you can think of another idea iam all ears . The one thing we don't want to do is to have a post on the other side of the pool or anything going across the pool such as a rail system. anyways thks again guys,hope to hear back from you john
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| Posted by: Pinkerton ® 01/27/2011, 09:46:41 Author Profile eMail author Edit |
Hi John, OK, I get the idea. The first problem I see will be caused by the wind. A beam is very strong/rigid in the vertical direction but when it gets a twist, which can be as little as 5 or 10 degrees it loses it 's rigidity very quickly. That means you may need to contemplate two beams side by side maybe 24" apart and some bracing between them. I have used this video before and if you stop-start it you can see that the racks are falling after a very sight twist in the support legs. Especially easy to see on the right side racks. You may want to turn off the sound before viewing...
With a 16' diameter umbrella, a breeze as slight as 1 or 2 mph on that 200-sq ft sail, may well be enough to destroy the integrity of the sliding structure unless very well designed. I am not saying don't do it, but this is NOT a job for a home handyman. You will have around 200-lbs of stuff that can fall on someone and maybe the folds of the umbrella trap them underwater and they drown. Not so much fun! Dave |
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| Posted by: pianoman ® 01/27/2011, 20:11:53 Author Profile eMail author Edit |
Thks again for responding ,your moet likely right about the wind
But this umbrella will hardly ever be out cause we need the sunshine on the pool to keep it warm through the solar blanket .So we would only have it out on those blistering days . We also want to use it as a covering for the inside of the trusses. So do know if theres a formula for finding the how much bend would be with a 148 lb umbrella? thks hope to hear back from ya john |
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