Patent ID: 7363989

Claim:
A pulling tool for use in pipelines and boreholes, the pulling tool comprising: a body that is elongated along a central longitudinal axis; a terminal element that is displaceable in a direction that is parallel to the central longitudinal axis; at least one link arrangement being displaceable in a radial direction with respect to the central longitudinal axis, the link arrangement comprising first, second and third elongated links, the second link hingedly connecting one end of the first link to the elongated body and the third link hingedly connecting the other end of the first link to the terminal element; a hinge pin connecting the third link to the terminal element, the hinge pin located on the opposite side of the central longitudinal axis relative to the first link; wherein displacement of the terminal element in the direction parallel to the central longitudinal axis causes displacement of the link arrangement in the radial direction with respect to the central longitudinal axis.