Hydraulically Operated Polished Rod Clamp
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United States of America Patent
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N/A
Issued Date -
May 21, 2015
app pub date -
Nov 21, 2013
filing date -
Nov 21, 2013
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A polished rod clamp includes a clamp housing having a central passage passing through a tapered bore. A wedge lock is arranged in the tapered bore such that a first surface of the wedge lock is in sliding engagement with a tapered surface of the tapered bore and a second surface of the wedge lock grips a rod in the central passage in a lock position. A first reciprocating piston is arranged to apply a first force to the wedge lock that effects a relative sliding motion between the wedge lock and the tapered surface in a first direction corresponding to the lock direction of the wedge lock. A second reciprocating piston is arranged to apply a second force to the wedge lock that effects a relative sliding motion between the wedge lock and the tapered surface in a second direction that is opposite to the first direction.
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