Importance

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Abstract

Embodiments of the invention relate to a method and apparatus for reducing the space requirements of, and improving the performance of, a flat type spring formed to produce a negative gradient torque. In an embodiment, a retainer can be added over at least two coils on the free end of each spring to reduce the space requirement for the spring. Embodiments of the invention can incorporate a flat type spring with a negative gradient having reduced space requirements into a shade or blind. Such a shade or blind will then be able to fit into a smaller area or volume. Specific embodiments can use multiple springs restrained in accordance with the subject invention to achieve a desired counterbalancing of the shade or blind. Further embodiments can incorporate gearing to alter the torque output of the springs. Further specific embodiments can incorporate one or more springs restrained in accordance with the invention and gearing to alter the torque output of the one of more springs.

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First Claim