Force-balancing mechanisms especially useful for assisted lifting/lowering of aircraft stairs
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United States of America Patent
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Aug 23, 2016
Grant Date -
May 14, 2015
app pub date -
Nov 8, 2013
filing date -
Nov 8, 2013
priority date (Note) -
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Abstract
The disclosed embodiments herein are generally directed toward force-balancing mechanisms for weighted members and/or loads. According to one embodiment, the force-balancing mechanism includes at least one gear rack, at least one spring assembly comprising a spring member operatively connected to the at least one gear rack, a pinion gear intermeshed with the at least one gear rack; and a variable radius cam. Rotation of the cam causes the pinion gear to rotate to thereby in turn linearly drive the at least one gear rack and accumulate spring force of the spring member. The spring member may be a compression or a tension spring. Preferably, the spring member is a compression spring.
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