| US 7,458,786 B2 | ||
| Oil well pumping unit and method therefor | ||
| Robert George Mac Donald, 3500 Sahara La., Bakersfield, Calif. 93313 (US) | ||
| Filed on Mar. 04, 2005, as Appl. No. 11/73,339. | ||
| Claims priority of provisional application 60/549873, filed on Mar. 04, 2004. | ||
| Prior Publication US 2005/0196286 A1, Sep. 08, 2005 | ||
| Int. Cl. F04B 17/00 (2006.01); F04B 35/00 (2006.01); F04B 9/08 (2006.01) | ||
| U.S. Cl. 417—328 [417/390; 417/904; 166/68; 166/69] | 13 Claims |
| 1. An oil well pump comprising:
a fluid reservoir in fluid communication with a first side of a pump;
a cylinder having a top side, a bottom side and an internal chamber, the internal chamber of the cylinder in fluid communication
with a second side of the pump;
a cylinder mount attached to the bottom side of the cylinder;
a load beam having a first end and a second end, and wherein the cylinder mount is attached between the first end and the
second end of the load beam;
a fulcrum arm having a first end, a second end and a pivot point, the pivot point positioned between the first end and the
second end, and wherein the first end of the fulcrum arm is pivotally attached to the first end of the load beam;
a vertical post having a first end and a second end, and wherein the fulcrum arm is pivotally attached to the vertical post
between the first end and the second end of the vertical post at the pivot point of the fulcrum arm;
a cylinder link having a first end and a second end, the first end of the cylinder link pivotally attached between the first
end of the fulcrum arm and the pivot point of the fulcrum arm;
a ram having a first end and a second end, the first end of the ram pivotally attached to the second end of the cylinder link
and the second end of the ram positioned through the top side of the cylinder to move into and out of the internal chamber
of the cylinder without detaching from the top side of the cylinder; and
a belt or chain coupled to near or at the first end of the fulcrum arm.
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