Implements or apparatus for applying pushing or pulling force – Pipe or rod jack – Lifter
Patent
1998-08-07
2000-08-01
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Pipe or rod jack
Lifter
E21B 1900
Patent
active
060954981
ABSTRACT:
A device which comprises (a) at least one receiving means for receiving a free end portion of an elongate first object, the elongate first object being comprised of (i) the free end portion and (ii) an embedded end portion which is embedded in a second object, (b) at least one clamping means connected to or integral with the receiving means for applying at least one clamping force to the free end portion of the elongate first object, and (c) at least one jack which comprises a cylinder, a piston, a piston rod, and a base, the jack being connected to the receiving means so that when (i) the elongate first object is received by the receiving means, (ii) the base is in contact with the second object and (iii) a pressurized fluid is introduced into the jack to provide a separating force, the receiving means may be urged away from the second object while the clamping means applies the clamping force to the elongate first object, the amount of clamping force applied by the clamping means being proportional to the magnitude of the separating force. Other devices and methods are also described which enable the efficient removal of elongate objects such as, e.g., wooden stakes, from other objects such as, for example, the ground in which the elongate objects are embedded.
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