Multiple sensor for preventing a crown-block incursion on an...

Implements or apparatus for applying pushing or pulling force – Apparatus for hauling or hoisting load – including driven... – Device includes rotatably driven – cable contacting drum

Reexamination Certificate

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C254S269000, C254S275000

Reexamination Certificate

active

07461830

ABSTRACT:
The technology disclosed herein provides a multiple sensor system that prevents crown incursion by a traveling block in an oil rig. This system calculates traveling block position, traveling block velocity and weight supported by the traveling block, and uses this information to calculate emergency stopping positions to prevent crown out by the traveling block. The system takes all these parameters into consideration when slowing and/or stopping the traveling block when it reaches a crown out position. The result is much safer operation of the traveling block on a workover rig, as well as on an oil drilling rig.

REFERENCES:
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patent: 5342020 (1994-08-01), Stone
patent: 5405027 (1995-04-01), Plass
patent: 6135421 (2000-10-01), Bartelme et al.
patent: 6343703 (2002-02-01), Fleagle et al.
patent: 7138925 (2006-11-01), Nield
patent: 7226037 (2007-06-01), Newman
patent: 7293761 (2007-11-01), Malek et al.

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