Method and apparatus to raise and lower an overhead door
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United States of America Patent
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Jun 2, 2015
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N/A
app pub date -
May 7, 2014
filing date -
Oct 29, 2013
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Abstract
A method and apparatus to raise and lower an overhead door comprising a lift mechanism, a master pulley block, a fixed pulley mounted to the lift mechanism, a plurality of guide sheaves each associated and spaced from with the master pulley block and supported by the elongated support member, and a plurality of cables each having two opposing ends and passing over the fixed pulley and the master pulley block and further passing over an associated one of the plurality of guide sheaves, wherein each cable of the plurality of cables attaches by attachment means to an overhead door.
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