Surface Machinery and Methods for Oil-Well Pumping Page: 72

Plate XV shows a plan and vertical section of this power, now
operating in the Humble oil field near Houston, Tex. It con-
sists of a base plate, a, bolted to a concrete foundation by eight
large bolts. In the center of the base is a vertical shaft around
which the table b revolves. Between this table and the shaft
is a replaceable liner to take up wear. The table is supported on
the base by a horizontal bearing surface, which has an outside
and an inside oil channel running around the entire circumference.
By means of a pump the surfaces are supplied with oil to insure
ample lubrication. Any surplus oil runs into a sump at the base
of the vertical shaft and is led off in a drain pipe. A mud band
that entirely surrounds the gib over the bearing surface protects
the surface from dirt and other foreign matter.
The table also carries the cranks c and d and the gear table e,
both of which are firmly bolted to it. A steel pinion, f, firmly held
in place by a key and a large nut and lock washer, drives the gear
table. The pinion and shaft are supported at the table by a strong
heavy bearing box, g, which is firmly bolted to the base. The
cranks are of cast steel and carry two disks or crank rings, h and k,
one above the other and 38 inches between centers. These rings
are of cast iron, babbitted to the crank, and are cast in halves fas-
tened together by six bolts which can be tightened to take up the
wear. Each disk or ring has 16 brass bushing holes, to each of
which a shackle line leading to a well can be attached. Each ring
is well lubricated and has a stroke of 38 inches, but this stroke may
be varied according to the size of the crank used. The gear ratio
in the power is 8 to 1.
Fifty-five horsepower is needed, and a steam, gas, or oil engine
may be direct connected. This " power " was especially designed to
pump wells 3,500 to 4,000 feet deep. The 55-horsepower oil engine
is shown at 1 connected by a coupling, m, to the drive shaft n. At
o is a clutch that is thrown out until the engine is started. The air
compressor p belt-connected to the pulley m on the drive shaft sup-
plies air to a receiver, where it is stored to start the engine. A
rotary pump, q, is driven by the pulley r.
For more than 20 years bevel gear and eccentric powers have
been common in the oil fields. In construction they are similar to
the bevel-geared disk type, except that eccentrics, instead of crank
and disk, are used on the vertical gear shaft to impart motion to
the shackle lines. Generally they are made with one, two, or three
eccentrics, according to the number of wells to be pumped. Two
eccentrics are generally placed 180 apart and three eccentrics 1200

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George, H. C. Surface Machinery and Methods for Oil-Well Pumping, report, 1925; Washington D.C.. ( accessed June 26, 2017), University of North Texas Libraries, Digital Library,; crediting UNT Libraries Government Documents Department.