Block position sensor
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United States of America Patent
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-
Aug 28, 1990
Grant Date -
N/A
app pub date -
Feb 12, 1987
filing date -
Feb 12, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A block position sensor which is responsive to rotation of a drawworks drum for indicating change in position of a traveling block in a drilling rig is disclosed. The sensor includes elements for providing a first output having a fixed relationship to the rotation of the drum, the sensor having a rotatable component reflecting the output, the first output capable of driving an adjustable drive unit for providing a second output having an adjustable relationship to the rotation of the drum; and sensor elements adapted to detect angular rotation of the rotatable component of the sensor for providing a first output and to provide a signal corresponding to amount of rotation of the rotatable component.
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