Spring counterbalance apparatus and method
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United States of America Patent
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Aug 11, 2015
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app pub date -
Apr 13, 2013
filing date -
Apr 13, 2013
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Abstract
A spring counterbalance apparatus and method consists of a shade system with a torque profile, where the shade system is connected with a drive shaft. A first spring system is connected with the drive shaft where the first spring system is a standard wound spring system. A second spring system is connected with the drive shaft where the second spring system is a reverse wound spring system and where, in combination, the first spring system and the second spring system produce a counterbalance torque profile approximately equal to the shade system torque profile.
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