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Originally Posted by
eesakiwi
Someone told me the door springs can be used on horse floats, where they need the big door to drop down & become a drawbridge/ramp for getting the horse outta the trailer.
The spring is put in pretensioned & compensates for the weight of the big door.
I haven't actually sold one or checked it out yet, but I do have one put aside, just in case its true.
I know we are off topic here but I think I should give some words of advice here on the spring subject for people reading this thread.
First and foremost these springs are no joke! They can kill you! Winding springs with the wrong tools can get you broken fingers or dead and any where in between!
Eesakiwi you are correct you can use the same idea of counter balancing a door or a tailgate. The type of spring for a drop gate would be a torsion spring.
With a garage door the door weighs less and less as it goes up as the panels fall back onto the horizontal track. A drop gate would remain the same weight as it drops so for each application requires different drums for the cables. Springs are rated at foot pounds per turn. There is more math involved to these springs then one may expect.
Not only are the springs very dangerous to handle by untrained workers they are also rated for a set amount of cycles! Most doors have 2 springs, when one breaks it is best to replace both as they have cycled the same number of times and there life is about up! So when people find a spring that is not broken they think it is a good spring but really that spring is near the end of it's usable life. Trust me you don't want to be winding (preload) a spring and have it break on you!
Just think of the spring in a lighter. When you take the wheel off the flint the flint and spring flies across the room. Now think about a spring that is 32" long with a 0.250" gauge wire at 2" ID.
Just thought I should warn folks of the dangers!
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