Machine element or mechanism – Mechanical movements – Rotary to or from reciprocating or oscillating
Patent
1983-07-13
1987-08-18
Staab, Lawrence
Machine element or mechanism
Mechanical movements
Rotary to or from reciprocating or oscillating
74 41, 74108, F04B 4702
Patent
active
046868623
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 wall 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 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.
REFERENCES:
patent: 1979675 (1934-11-01), Croom
patent: 2123679 (1938-07-01), Mahan
patent: 2152701 (1939-04-01), Mansfield
patent: 2245117 (1941-06-01), Shimer
patent: 2428142 (1947-09-01), Carter
patent: 2441255 (1948-05-01), Ashton
patent: 2618172 (1952-11-01), Shoup
patent: 3027221 (1962-04-01), Winfrey
patent: 3159107 (1964-12-01), Hallmark
patent: 3310988 (1967-03-01), Gault
patent: 4631970 (1986-12-01), Pauls
Greeno Industries Inc.-drawing of a pump, admitted prior art.
Durham Clyde S.
Mair Steven M.
Mark IV Industries, Inc.
Staab Lawrence
LandOfFree
Low profile pump jack does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Low profile pump jack, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low profile pump jack will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1110524