Polish rod locking clamp
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United States of America Patent
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Apr 28, 2015
Issued Date -
N/A
app pub date -
Oct 7, 2004
filing date -
Jun 9, 2000
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A pump drive head for a progressing cavity pump comprises a top mounted stuffing box rotatably disposed around a compliantly mounted standpipe with a self or manually adjusting pressurization system for the stuffing box. To prevent rotary and vertical motion of the polish rod while servicing the stuffing box, a polished rod lock-out clamp is provided with the pump drive head integral with or adjacent to a blow-out-preventer which can be integrated with the pump drive head to save space and cost. A centrifugal backspin braking system located on the input shaft and actuated only in the backspin direction and a gear drive between the input shaft and output shaft are provided.
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