Rod lock out clamp
AssigneeOil Lift Technology Inc.
InventorRoss Willard Senger
Life of this patent
Estimating the term…
Abstract
A rod lock out clamp includes a housing having a central bore for receiving a rod in spaced relation therethrough and clamp members in the housing for grippingly and frictionally engaging the rod in the bore. At least one of the clamp members has an inner end and a recess in the inner end, the recess having a profile with an arcuate portion having a radius of curvature that reduces from a maximum radius to a minimum radius. Manipulating means are coupled to the housing and the clamp members for moving the clamp members between a rod gripping position and a retracted position.
Claims26
A rod lock out clamp for use on a well bore in a production oil, water or gas well installation, the lock out clamp comprising:
- a housing having a central bore for receiving a rod in spaced relation therethrough;
- clamp members in the housing for grippingly and frictionally engaging the rod in the bore, at least one of the clamp members having an inner end and a recess in the inner end, the recess having a profile with an arcuate portion having a radius of curvature that reduces from a maximum radius to a minimum radius, wherein the at least one clamp member comprises a generally cylindrical body;
- and
- manipulating means coupled to the housing and the clamp members for moving the clamp members between a rod gripping position in which the clamp members grippingly engage the rod to prevent rotation or axial movement thereof, and a retracted position in which the clamp members are removed from the rod to permit rotational and axial movement of the rod in the bore.
A rod lock out clamp for use on a well bore in a production oil,
- water or gas well installation, the lock out clamp comprising:
- a housing having a central bore for receiving a rod in spaced relation therethrough;
- clamp members in the housing for grippingly and frictionally engaging the rod in the bore, at least one of the clamp members having an inner end and a recess in the inner end, the recess having a profile with an arcuate portion having a radius of curvature that reduces from a maximum radius to a minimum radius;
- and
- manipulating means coupled to the housing and the clamp members for moving the clamp members between a rod gripping position in which the clamp members grippingly engaged the rod to prevent rotation or axial movement thereof, and a retracted position in which the clamp members are removed from the rod to permit rotational and axial movement of the rod in the bore, wherein the recess includes an inner surface, the inner surface having a plurality of parallel notches.
A rod lock out clamp for use on a well bore in a production oil,
- water or gas well installation, the lock out clamp comprising:
- a housing having a central bore for receiving a rod in spaced relation therethrough;
- clamp members in the housing for grippingly and frictionally engaging the rod in the bore, at least one of the clamp members having an inner end and a recess in the inner end, the recess having a profile with an arcuate portion having a radius of curvature that reduces from a maximum radius to a minimum radius;
- and
- manipulating means coupled to the housing and the clamp members for moving the clamp members between a rod gripping position in which the clamp members grippingly engaged the rod to prevent rotation or axial movement thereof, and a retracted position in which the clamp members are removed from the rod to permit rotational and axial movement of the rod in the bore, wherein the clamp members comprise two radially opposed rams, the rams having mutually engageable end faces at the inner ends thereof and elastomeric seal means disposed between the end faces, the rams being sealingly disposed in a respective clamping bore and being sealingly engageable with the rod and with each other to prevent well fluids from escaping past the lock out clamp when the clamp members are disposed in the gripping position.
A clamp member for use in clamping a rod, the clamp member comprising:
- a body having a recess for receiving the rod, the recess having a profile with an arcuate portion having a radius of curvature that reduces from a maximum radius to a minimum radius, wherein the minimum radius is at a halfway point between two ends of the profile, and wherein the body is generally cylindrical and has a first end and a second end, the recess being positioned within the first end;
- and
- a coupling portion configured for coupling to manipulating means for advancing the clamp member towards the rod to be clamped.
A clamp member for use in a clamping rod, the clamp member comprising:
- a body having a recess for receiving the rod, the recess having a profile with an arcuate portion having a radius of curvature that reduces from a maximum radius to a minimum radius, wherein the arcuate portion of the profile is a portion of an ellipse, and wherein the body is generally cylindrical and has a first end and a second end, the recess being positioned within the first end, and
- a coupling portion configured for coupling to manipulating means for advancing the clamp member towards the rod to be clamped.
Dependencies are inferred from the claim text.