Variable tension device with adjustable features for spring rate, initial tension and connection to external parts

摘要

In a variable tension device having an elongated torsion member adapted to be connected at axially spaced points to a relatively fixedly mounted support and to an object rotatably movable relative to said support, novel structure is provided for adjusting (a) the effective length of the torsion element, thereby to vary the effective spring rate, (b) the angular anchor position of that portion of the torsion bar secured to the support, and (c) the axial and, if desired, angular position relative to the torsion element of the member connecting that element to said external object.