Wells – Processes – Placing or shifting well part
Reexamination Certificate
2005-07-26
2005-07-26
Neuder, William (Department: 3672)
Wells
Processes
Placing or shifting well part
C166S206000, C166S216000, C166S241100
Reexamination Certificate
active
06920936
ABSTRACT:
A substantially constant force actuator that is applicable to centralizers, anchors and tractors for use in wells and is applicable to lifting devices such as jacks and load supporting devices. One or more sets of linkage arms are angularly movable by the force of one or more force transmitting members from a minimum angle with the force transmitting members at maximum spacing to a maximum angle with the force transmitting members at minimum spacing to impart a substantially constant force to an object or surface, with the direction of the force being substantially perpendicular to the direction of relative linear movement of the force transmitting members. With the linkage arms at their minimum angles, movement control elements on at least one of the force transmitting members react with guide surfaces of the linkage arms to achieve angular linkage movement and to develop a substantially constant force during angular linkage movement.
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Cordera Joseph F.
Post Roger A.
Roy Carl J.
Sheiretov Todor K.
Curington Tim
Kanak Wayne
Nava Robin
Neuder William
Schlumberger Technology Corporation
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