Surface Machinery and Methods for Oil-Well Pumping Page: 80
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80 SURFACE MACHINERY AND METHODS FOR OIL-WELL PUMPING.
ing. The plate also shows the braces b, made of pipe gas-welded in
place, the guide blocks c bolted to the concrete foundation, the at-
tachment d for the take-off hook, the old cable shackle line babbitted
to the attachment hooks at e, and the take-off hook f.
PENDULUM MULTIPLIER FRICTION-POST SUPPORT
Used as hold down,
hold up,or multiplier.
FIGURE 11.-Shackle-line structures.
EQUIPMENT FOR SUPPORTING SHACKLE LINES.
The swing post, Figure 11, A, is commonly used in Pennsylvania
where it is made of the green timber at hand. A log is split and
the two pieces placed flat side down for ground sills; across
these another piece of split log with the round side down fits into
notches cut in the sills which serve as bearings. To the upper side
of the crosspiece, two mortised or bolted arms extend up to meet
the shackle line and are coupled to it by a clamp and loose bolt at-
tachment. The two ground sills must have the same elevation and
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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/m1/109/: accessed November 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.