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How to determine support bracket location?

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Forum topic by HabaneraHal posted 02-09-2013 02:02 AM 603 views 0 times favorited 4 replies Add to Favorites Watch
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HabaneraHal

9 posts in 813 days


02-09-2013 02:02 AM

Topic tags/keywords: gas strut lid support question

I’m finishing up a trunk for my daughter. I plan to use a gas-charged strut to ease lowering the lid. I want the lid to be able to open a tad over 90. The strut I’m using is 7-1/4” center-to-center on the pivot points extended with a 2-1/8” stroke.
Do I just locate the brackets so the strut is at a 45
angle when open and equi-distant from the hinge center-line?
Thanks!

-- I've yet to find a nice piece of wood I couldn't mess up.


4 replies so far

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Dan Krager

1672 posts in 951 days


#1 posted 02-09-2013 03:32 PM

Habanero, is this a spring loaded strut? Another thought comes to mind; will the trunk top flex, as in twist, if only one strut is used? And one more; how close to shut does the strut stop the falling motion of the lid?
So far more questions than answers. I think that you will have to experiment a bit, especially if the strut didn’t come with installation template. My concern is that unless the falling check occurs before it reaches 6” closed, it will still be a hazard to small necks.
My choice? A pair of adjustable friction stops where no free fall is possible.
DanK

-- Dan Krager, Olney IL http://www.kragerwoodworking.weebly.com

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HabaneraHal

9 posts in 813 days


#2 posted 02-09-2013 11:42 PM

Hi Dan, thanks for the reply.
This is a gas-filled strut (like the ones that you see on automotive trunks). No concern about twist or flexing of the top, it’s quite substantial. Yes, due to design I can only use one strut. Also, daughter is 24 yo adult, no worries about neck (LOL) just don’t want wind to blow top over and slam down. Here’s a shot of the mounting area:


and the strut assembly:

I tried a Rockler Soft Down support, http://www.rockler.com/product.cfm?page=415&site=ROCKLER but it isn’t strong enough.

-- I've yet to find a nice piece of wood I couldn't mess up.

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RussellAP

2959 posts in 1003 days


#3 posted 02-09-2013 11:45 PM

You could try spring loaded hinge on the back side. some of them are adjustable. I don’t mean in place of the hinges you have now, but in addition to them.

-- A positive attitude will take you much further than positive thinking ever will.

View Dan Krager's profile

Dan Krager

1672 posts in 951 days


#4 posted 02-10-2013 03:14 AM

I’m always concerned about future events because I want to believe that I assemble heirlooms. Heirlooms are passed from generation to generation and almost always kids are involved. I mean, stuff happens; visitors, friends, and other casual encounters are often where the unexpected happens. Just sayin’.

I don’t think you’ll find any patters for where to place your fasteners. Lacking them, the only approach I can think of is to mimic the two pieces involved in a sample and see how it behaves. I.e. take two boards, orient them like the lid and side of trunk, put a hinge roughly where your trunk hinge is (you might only get one screw in each leaf but that’s OK) and test different locations. Start with what you suggested, but I think you will find the ultimate position to be quite a ways from where you thought it would be. I suspect that the lid won’t shut using a 45 degree angle for the strut, or if it does shut, it won’t open as far as you like. I’ve had to do this with some drop leaves, too, and it is purely guess work with a bit of reasoning thrown in. I think you will have to keep the trunk end of the strut fairly close to the top edge and move the lid contact toward the hinge until you get maximum benefit of the full plunger travel.

Good luck. When you find the sweet spots, do the world a favor and post the locations relative to the hinge pivot!
DanK

-- Dan Krager, Olney IL http://www.kragerwoodworking.weebly.com

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