ELEVATOR BRAKE MONITORING
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United States of America Patent
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app pub date -
Dec 18, 2015
filing date -
Dec 19, 2014
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Abstract
An elevator brake, having a rotatable component mounted to a shaft, is monitored for contamination by projecting electromagnetic radiation onto the rotatable component or onto the shaft, and receiving reflected electromagnetic radiation. If the monitored zone on the rotatable component or the shaft becomes contaminated, for example with oil or grease, the nature of the electromagnetic radiation reflected from the zone will change noticeably.
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