F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
103/142
F04B 47/02 (2006.01) F04B 47/12 (2006.01)
Patent
CA 1207593
LOW PROFILE PUMP JACK ABSTRACT A pump jack for reciprocating a string of rods in a well is disclosed in which a drive shaft having an axis below the axis of a guide wheel supported above the well has a crank arm mounted to each end of the drive shaft for rotation therewith, counterweight means having a center of gravity offset from the axis of the drive shaft are mounted to each crank arm to assist in lifting the rods, and the inner ends of pitman arms are rotatably secured to the crank arms at a pivot point offset from the axis of the drive shaft. A cross bar is secured to the outer ends of the pitman arms and a flexible linkage extends over the guide wheel, this linkage having one end carried by the cross bar and the other end adapted to be secued to the string of rods. and the crank arm is constructed so that a radial from the drive shaft passing through the pivot point of the pitman arms will be substantially tangent to the top of the guide wheel when the counterweight means is at its uppermost position. All of this structure is mounted on a single skid with the drive shaft and its support being centrally located along the length of the skid, and and with the drive means for the drive shaft being mounted on the end of the skid remote from the guide wheel. Various safety and repair expedients are described and preferred operation involves a wedge- shaped counterweight member and a precise angle between the connection to the pitman arm and the centerline of the counterweight member.
441316
Durham Clyde S.
Mair Steven M.
Fetherstonhaugh & Co.
Mark IV Industries Inc.
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