Patent ID: 8777195
Filing Date: 2014-07-15
Classification: A61F,F16F

Abstract:
1. A non-linear spiral torsion spring assembly comprising: a. a spiral torsion spring comprising: an elastic material; an inner surface; an outer surface; a neutral axis; an inner connection point; an outer connection point; and a cross-section b. a central support structure coupled to the inner connection point of the spiral torsion spring; and c. an outer support structure concentric to the central support structure coupled to the outer connection point of the spiral torsion spring; d. wherein said non-linear spiral torsion spring assembly is configured so that, in operation: e. wherein, the point of contact between the central support structure and the torsion spring and the point of contact between the outer support structure and the torsion spring may be either coplanar or out of plane, wherein the cross section of the spring along the neutral axis is nonuniform, and wherein the cross section and curvature along the spring's neutral axis achieves a uniform maximum stress at all points of the inner and outer surfaces.