Bearing for a wind turbine
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United States of America Patent
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Jun 30, 2015
Grant Date -
Feb 20, 2014
app pub date -
Feb 29, 2012
filing date -
Mar 3, 2011
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Abstract
A rotary mechanism for incrementally advancing a rotary element (13) with respect to a ground member (12) comprises a unidirectional clutch (41) and a rotary actuator (21, 33, 39). Actuation of the actuator is against a resilient bias (34), and overcomes friction between the rotary element and the ground member to advance the rotary element with the unidirectional clutch locked. Release of the actuator allows re-setting thereof by the resilient bias, the friction between the rotary element and the ground member resisting further relative movement.
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