Sounds like two coils and a straight extrusion to me, assuming you want to model the actual spring blade. Is there some reason a pair of disks and a thin blade between won't suffice?
Not sure if that would work for a positional representation...I could model the spring like that for the closed position and just turn it off for the open position I guess.
Would probably have to be turned off for any animations too.
Spiral Coil a line as a surface and then Thicken.
add additional sketch geometry as needed. Animate Parameter for motion of spring. (give a parameter name to the Pitch as well so that it can be animated)
You didn't indicate Inventor version - or I could have posted an example ipt file.
Image shows Studio increase Pitch between 0 and 1 sec, decrease pitch between 1 and 2 sec.
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