Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Charles E. Jennings0
Date of Patent
October 17, 2006
0Patent Application Number
108210720
Date Filed
April 8, 2004
0Patent Primary Examiner
Patent abstract
A centralizer is located in a passage of a tubular body of a wellhead assembly for centralizing well tools lowered through the passage. Centralizing members have outer ends mounted to axially extending stationary hinge members, which are mounted to the tubular body in a circular array around a circumference of the passage. A cam and a slot are located between the outer end of each of the centralizing members and the stationary hinge member. Each of the slots has an upward inclined portion, a downward inclined portion, and a neutral position located between the upward and downward inclined portions. A spring urges the cam and the slot to the neutral position, which orients the centralizing members radially inward.
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