Electrically-Controlled Puller For Oil-Well Casings. Page: 3 of 3
[1], 2 p. : ill. ; 23 cm.View a full description of this patent.
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1,374,833
14 extending upward into a housing ring 15,
which is placed around the screw-threaded
stud 16 to receive the lower end of the pull-
ing rod 17. The electro-magnet leads 14
5 pass into a suitable covering 18 and extend
to the top of the well, where they will be
connected with any desired electrical source
and controlled by any suitable switch (not
shown). This housing ring 15 is attached
10 to the upper end of the body 1 by means of
suitable bolts 18, and the leads 14 are em-
bedded in suitable waterproof cement 19,
which fills the housing ring 15.
In operation, the lifting tool is lowered
15 into the well casing to the desired point and
the locking balls may be drawn upward in
the sleeves 7, by the electro-magnets, as
shown in Fig. 4, to prevent them from en-
gaging the casing, so that the puller can be
20 freely moved, up and clown in the casing
until the desired location therein is obtained.
At this time, the balls are released by mak-
ing the electric circuit and they fall to the
positions shown in Figs. 2 and 4, whereby
25 they will engage the inner wall of the casing
3, so that an upward pull on the tool will
cause the balls to roll downward and form
locking wedges between the casing and body
1. The casing may then be pulled or lifted
30- as desired. The puller can be released at
any time from the casing by simply permit-
ting it to drop slightly and then closing the
circuit for magnetizing the magnets 13 to
lift the bails within their sleeves, permitting
35 the tool to be moved up and down freely
within the casing.
From the foregoing it will be observed
that the locking members 6 are normally in
their locking positions, but are held in their
40 unlocked positions by energizing the electro-
magnets 13.
I do not limit myself to the exact construc-
tion here shown, for that may be varied by
those skilled in the, art without departing
45 from the spirit and scope of my invention,
as defined in the following claims.
Having thus described my invention, what
I claim and desire to secure by Letters Pat-
ent is:-
50 1. A casing puller, comprising a body
having a plurality of normally projectinglocking members and a plurality of electro-
magnets for holding the locking members in
their unlocked positions.
2. A casing puller comprising a body hav- 55
ing a plurality of inclined passages opening
through the side of the body, a locking ball
in: each passage, and an electro-magnet in
each passage for holding the balls in their
unlocked positions. 60
3. A casing puller comprising a body por-
tion, having a plurality of outwardly in-
clined passages with their upper ends open-
ing at the top of the body and their lower
ends passing out of the side of the body, a 65
plurality of locking balls in the passages,
the lower end wall of the passage constructed
to hold the balls therein with their periph-
eries projecting beyond the body, and an
electro-magnet in each passage having leads 70
extending to the top of the well, whereby the
locking balls are held in their unlocked posi-
tions when the magnets are electrically ener-
gized.
4. A casing puller comprising a body hav- 75
ing upper ;and lower series of outwardly in-
clined passage-ways with their lower ends
passing out through the body at different
elevations, a locking ball in each passage
adapted to project beyond the outer surface 80
of the body, an electro-magnet in each pas-
sage, the magnets having leads extending
upward through the well for the purpose of
energizing the magnets and holding the
locking balls in their unlocked positions. 85
5. A casing puller comprising a body hav-
ing an inclined passage with its lower end
opening through the outside of the body, a
locking ball adapted to have its periphery
project beyond the outer face of the body 90
and an electro-magnet adapted to lift and
hold the ball in its unlocked position.
6. A casing puller comprising a body hav-
ing an outwardly inclined passageway, a
brass tube within the passage, a ball within 95
the passage, an electro-magnet within the
passage and above the ball, whereby the ball
may be lifted to its unlocked. position by
electrically energizing the magnet.
In testimony whereof I hereunto affix my 100
signature.
WILLIAM D. DOOLEYP.
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Dooley, William D. Electrically-Controlled Puller For Oil-Well Casings., patent, April 12, 1921; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth1256687/m1/3/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.