Wind-Up Motor Spring

Thanks for the Info!!! I will keep trying , but i have tried at least 8 of the Companys on the list .

Best Regards, Ralph Pope

Thanks , I will give it a look see !!!I have tried numerous Spring Manufacturers , nothing but various types .

A GA for looking here on GlobalSpec.

You might also try looking for power spring. A pancake shape might be easier to find than a roll of quarters shape.

Thanks, i wish i had room for a Pancake Shape, but i am restricted to a Tubular shape due to a restriction in space. Regards, Ralph

I wonder if you could achieve your goal using a normal (stretch/compression) spring but twisting it instead.

"I wonder if you could achieve your goal using a normal (stretch/compression) spring but twisting it instead." This is seldom optimal, and merely gripping the ends is a problem, the first of many . . . but it gives rise to another possibility.

Given the package size / shape constraints, is it possible that a compression spring can be used to move a nut to turn a helical shaft? I'm thinking in terms of a high lead-angle, non- self-locking leadscrew such as http://www.roton.com/torqspline-screws-nav.aspx?line=Torqspline (look under General Information for the non self-locking description). This would efficiently fit the shape, and number of turns can be optimized. It is even possible to use two nuts and two short springs, e.g., if you need more force and less stroke, or to use multiple concentric springs (alternating winding directions!).

On the other hand, if you need many turns, a helical torsion spring may still be your answer; roller window shades, and rollers for maps and projection screens, are of this type. One possible source is Graber division of Springs Industries (http://www.graberblinds.com/). You'd need to make contact; their website is all about fashion, not the technical side.

I think i have found something at Century Spring that i can modify, and make work .

Thanks , Ralph Pope

Good! Let us know how it works out!