Do it Yourself: Re: [DIY] Lift Assist Hinges

Think lever arms!!!

google the "lever arm formula"

.the point is gas assist arms placed closer to the front require
a tremendously less force (moment of rotation/length of arm from rotation poiint)
which makes torque needed to open less as you probably know..so adding
gas assist 2/3 from hinge towards front should solve the problem if I
understand your mechanics correctly...and make it lift as light as a feather
like it does on my 200 lb truck bed cover!!
____________________

Forever bonded We Band of Brothers

Ad Inexplorata; De oppresso liber

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On Tue, 10/27/15, subprong subprong@gmail.com [DoIt_Yourself] <DoIt_Yourself@yahoogroups.com> wrote:

Subject: Re: [DIY] Lift Assist Hinges
To: DoIt_Yourself@yahoogroups.com
Date: Tuesday, October 27, 2015, 12:46 PM

To answer
some questions in the thread...

David, it's a mini-roof that opens
up.

Mountain Master,
there is room on the inside (and actually that's what
I'd prefer) for the assist hinges so long as they are
not massive. I hate to narrow or constrain the field but
was hoping to find something for purchase and also
relatively priced and located.

Bob, I think I'm using the correct
term but perhaps not. As I've been researching these
devices, I've seen a formula given with several
products. The formula is to basically determine how much
force or torque your item needs in order to lift it so that
you can compare it to the pound rating for the hinges. The
formula is weight (pounds) x (TIMES) width (inches) (front
to back) / (DIVIDED BY) 2 . What I need is between
1000-2000. The highest I've seen in-store is about 100
per hinge.

Something I've also been
wondering.... I imagine the perfect rating matchup will
perfectly assist the device up or let it down (essentially
floating up and down). It would be fine if it simply makes
it easier to lift. I'm wondering if a device rating of
200 will have any impact on a lid that optimally requires a
1500 or so rating.

On Tue, Oct 27, 2015 at
1:17 PM, Bob Davis bob@wrobertdavis.com
[DoIt_Yourself] <DoIt_Yourself@yahoogroups.com>
wrote:

pounds per square inch is an odd rating for this
application. Are you sure it was rated in pounds per
square inch?
Bob
On Oct 27,
2015, at 12:34 AM, subprong subprong@gmail.com
[DoIt_Yourself] <DoIt_Yourself@yahoogroups.com>
wrote:

Any ideas
or help with this please. I need some sort of device that
would make a heavy lid/top easier to lift. The device
would work in conjunction with existing hinges. I've
seen things such as assist hinges, self balancing hinges and
gas springs. The problem is that the torque value for
these devices is well below what is needed for this
application. The highest I've seen (at least readily
available) would be a value of about 300 pounds per square
inch (and that's using 3 hinges). I need something
well above 1000.

Any ideas on products and where I can
find them? Thanks.

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