Surface Machinery and Methods for Oil-Well Pumping Page: 85
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timber arms and pipe braces attached by bearings to a vertical piece
of old casing concreted in place. Plate XXII, B (p. 77), shows a
butterfly that has a single steel arm, with shackle-line attachments at
each end, mounted and oscillating on a shaft the lower end of which
is set in a concrete foundation. This type of butterfly is used for
pumping a well from the side of the power, opposite the side on
which the well is located, thus insuring a balanced load. A butterfly
is sometimes made from timber arms bolted to flanges and shaft
made of rig iron. The shaft is placed vertically and reciprocates in
a bearing bolted to a conrete foundation.
The hold-over serves the same purpose as the butterfly. Most
hold-overs consist of a steel rod, attached by an eye and ring to the
shackle line at one end and attached by an eye to an anchored eye-
bolt at the other end, which is anchored to a tree or rock, or a piece
of timber or casing concreted in place. Plate XXII, C, at a shows
a hold-over anchored to. a piece of old casing.
Shackle lines should approach and leave the butterfly in the plane
of the two arms in order to prevent " side play " in the bearings
and structure. This is usually done by using either a rocker or pen-
dulum as a hold-down or hold-up, as required. Plate XIX, B, at c
(p. 76) shows a butterfly that provides a change in direction in
the shackle line both in a vertical and a horizontal plane. Peculiar
conditions required this installation.
When during a pulling job the shackle line of a well has been dis-
connected at the power, and the jack is disconnected at the well, often
the end of the shackle line at the well is attached to a hook to keep
the shackle line taut, so that connections to the jack can be readily
made when work at the well is completed.
EQUIPMENT TO CONNECT TO JACK AND POWER.
Shackle lines are attached to the power disk, or eccentric, by means
of devises or yokes with an eye or stirrup connection to a rod ex-
tending to the point, outside of the power building, where the throw-
off equipment is situated. Shackle lines are attached to the jack at
the well by means of a stirrup and bolted clamp. Some of these
power and jack attachments for shackle lines are shown in Plates
XX, A, at c (p. 77) ; XIX, C, at d (p. 76) ; XX, B, at e; and XX, C,
A turnbuckle at some convenient point in the shackle line per-
mits the length of the line to be changed without the well being
taken off. A turnbuckle so situated may also be used to pull a broken
line together, and to change the position of the working valve in the
When shackle lines not provided with turnbuckles break, they are
pulled together to their former position by means of a set of tackle
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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/m1/114/: accessed April 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.