Surface Machinery and Methods for Oil-Well Pumping Page: 88
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88 SURFACE MACHINERY AND METHODS FOR OIL-WELL PUMPING.
Pennsylvania jacks cost less than those of the Oklahoma type, but
are not so well suited for heavy duty. In some types the support-
ing legs are clamped around the casing head, in others they are bolted
to the derrick floor.
The Oklahoma type of jack is easier to disconnect and lay
aside during a pulling job than is the Pennsylvania type. When
a well "sands up," which is generally on the up stroke, the
jack automatically falls apart, because the pitman (c, in P1.
XXIII, B) drops out of the upper bearing. The stroke of the
Oldahoma jack can be more easily regulated at the well than that
of the Pennsylvania type. In California, where many Oklahoma
Rod 10 feet long
FIGURE 12.-Lightning pumping jack.
jacks are used, it is considered good practice to mount them on a
rigid support of Oregon pine.
Figure 12 shows a new type of pumping jack, known as the light-
ning pumping jack, recently introduced into some of the Mid-Conti-
nent oil fields. The frame is made of three tubular steel members,
a, b, and c. Pieces a and b serve as the supporting legs, and termi-
nate at their lower ends in a bearing, d, which in turn is supported
on a timber or concrete foundation placed directly back of the casing
head. The upper ends of these supporting legs are attached by a
bolted hinge joint e to the lower end of the member c. The upper
end of c is attached by a bearing and coupling, f, to the polish rod.
The shackle line is attached to the hinge joint e by a turnbuckle,
g, and a long stirrup, h, bolted to the bearing iron k. The bearing
iron k is held in the proper position by the steel cable 1, which is
attached at its upper end to the upper end of the upper member c,
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George, H. C. Surface Machinery and Methods for Oil-Well Pumping, report, 1925; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc12407/m1/117/: accessed November 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.