Patent ID: 9145648
Filing Date: 2015-09-29
Classification: B25B,B25C,E01B,Y10T

Abstract:
1. A pulling tool comprising: a housing; a tube disposed within the housing, the tube configured to supply hydraulic fluid; a piston rod connected to a piston, the piston rod having a hollow axial bore, the piston and the piston rod being axially moveable relative to the tube; and a passage communicating fluid from the tube to the piston, the passage being contained within the housing, wherein the passage is variable between a first configuration in which hydraulic fluid flows at a first restricted flow so as to provide a slower retraction of the piston rod and a second configuration in which hydraulic fluid flows at a second less restricted flow so as to provide a faster retraction of the piston rod, and wherein the passage is inside a boundary defined by an internal surface of the housing against which the piston is configured to slide.