Apparatus for gripping a pipe
AssigneeWeatherford/Lamb, Inc.
InventorsJoerg-Erich Schulze-Beckinghausen, Bernd-Georg Pietras
Life of this patent
Estimating the term…
Abstract
An apparatus for gripping a pipe comprises an outer member having at least one inclined inner surface and an inner member having an inclined outer surface, a tubular member having an opening to accommodate said inner member and a threaded part, and a threaded gear engaged with the threaded part of the tubular member. On rotation of the threaded gear the tubular member moves the inner member which co-operates with the outer member so that said inner member moves towards a pipe to be gripped. The apparatus is particularly useful for applying "non-marking" jaws to the outside of tubulars in the oil and gas industry.
Claims34
An apparatus for gripping a pipe, which apparatus comprises an outer member having at least one inclined inner surface and an inner member having an inclined outer surface, a tubular member with a first part thereof movably disposed inside said outer member and having a window which accommodates said inner member, the tubular member having a threaded part outside the outer member, and a drive member outside the outer member and operatively engaged with the threaded part of said tubular member and said outer member, so that when said drive member is rotated in one sense, said tubular member moves said inner member within said window and said inner member cooperates with said outer member so that said inner member moves towards a pipe to be gripped.
An apparatus as claimed in claim 7 wherein the inner member and outer member are separated by at least one beating.
An apparatus for gripping a pipe, which apparatus comprises an outer member having at least one inclined inner surface and an inner member having an inclined outer surface, a tubular member with a first part thereof movably disposed inside said outer member and having a window which accommodates said inner member, the tubular member having a threaded part outside the outer member, and a drive member outside the outer member and operatively engaged with the threaded part of said tubular member and said outer member, so that when said drive member is rotated in one sense, said tubular member moves said inner member within said window and said inner member cooperates with said outer member so that said inner member moves towards a pipe to be gripped, wherein the inner member and outer member are separated by a strip of linear bearings and the inclined surfaces are inclined at an angle such that the inner member and the outer member do not lock against one another, wherein said inner member is slidable with respect to said outer member, and wherein said outer member comprises two halves movable with respect to each other and openable to receive the pipe.
Dependencies are inferred from the claim text.