(Thought experiment: pull a single spiral out until it is completely straight, and it will rotate for each spiral turn and center attach point in alignment with the outer attach point. single spiral) will pull a little to one side. It makes sense to me that a geophone spring is similar in purpose.Īs in all the geophone springs I saw, I think you would want a symmetric (at least double-spiral) spring to balance the side forces. Looking forward to project pictures if you are willing to share. I definitely saw examples of planar springs for stirling engines, so you wouldn’t be alone. That doesn’t actually answer your question about existing code. It would look like three living hinges arranged radially. The goal of their patent was a little different from what you are looking at they wanted the axis to be stable with a single spring I’m inferring that you plan to use sets. For your case, if rotation would cause a problem, there’s a pretty obvious solution of stacking a set of zig-zag shapes in a Tri- n-1R for large n (10? 20?) using the nomenclature on page 4 of that patent. Look at figures 13-15 to see examples of how those springs could stack. That patent is dated 18 years ago and is assigned to the US Government so I presume it’s open without looking further. Unlike geophone (spider) springs, these ortho-planar springs do not experience significant rotation of the platform. Does the slight rotation of the rod when the spring is expanded in Z (where X,Y is the flat plane of your stock) not cause a problem for your application? See Ortho-Planar Linear-Motion Springs for whole classes of non-spiral flat springs which have no rotational moment. But instead of being the normal spiral torsion spring, being used to constrain motion to one since this is to replace a bearing, I assume you mean to rigidly attach the rod to the spring(s). The goal is to create a constraint, so it’s cutting a spiral out of flat stock, such that the material is held in two axes and can move in one.
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