Internal Pipe-Gripper Page: 3 of 5
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1,069,560
or secured on the lower end of the draw rod
12. Between the shoulders 26. are the jaw-
seats 28, which are upwardly. inclined to-
ward the axis of the swivel member, so that
5 the jaw-seating' element is wedge shaped,
and converging upwardly.. This jaw-seating
element is provided with a relatively large
aperture, communicating with the aperture
which receives the draw rod 12, and in this
. relatively large aperture, the lower e.nd of
the rod 12 and the studs 27 have consider-
able room to move up and down, so that the
jaws 13 may be caused thereby to travel on
the jaw-seats 28, while the studs 27 have
15 longitudinal movement in the apertures 26.
The spear head may be of ordinary con-
struction, and secured in any proper way,
as for instance, by screw-threaded engage-
ment with the element 25, as indicated at 29.
20 When a casing has been inserted in a well,
having been driven or packed therein, it. is
usually held very tightly, by meats of the
surrounding earth and rocks, and. there-
fore, it becomes necessary to jar and jerk
25 the pipe, for the purpose of disengaging it.
Therefore, it is necsary.to provide the jar
elements 30, 31 and 32. The jar element 30
consists of the bifurcated extension of the
jaw-seating element 33, while the element 32
30 extent between the furcations 30, and is
provided with a rectangular and elongated
vertical aperture 34, in which. is slidably
seated the - element 31, the latter being se-
cured between the ends of the furcatipis 30,
35 as indicated by the bolt 35, which may
either constitute a pivotal o" a rigid secur-
ing means, as desired. Th, element 33 is
provided - with dove-tail ;ja*' seats 36, ;n
which are slidably seated the jaws 37, which
40 have downwardly inclined sharp teeth 37'.
It will be seen that if the element 32 is
held stationary while the element 3 is
moved downward, the block 31 will m ve
downward in the slot 34, while the down-
46 wardly converging element 33 will have rel-
ative movement to the jaws 17, thereby sepa-
rating the jaws: said jaws being supported by
lateral extensions 38, which . are formed or
secured on the upper end of the element 32,
5o and constitute jaw-actuating elements.
During the operation of drilling a well,
the drilling tool is often deflected by con-
tact with a boulder or slanting ledge, which
causes the well to be out of vertical aline-
55 ment, and therefore, when the casing is in-
serted. it is likely to become disconnected at
one or more of the joints, owing to its con-
tact with said boulider or ledge, and the
necessary bending of the casing in conform-.
60 ing to- the shape of the well. Moreover, it
frequently occurs that after a well -has been
drilled to a very considerable depth, the ex-.
pected result in. obtaining water or oil is
not attained, and therefore, the casing must
as either be extracted from the vell or. lost.In attempting to iemovl..the casing in see-
tions, it sometimes occurs that dirt and stones
will be dislodged from the side of the well,
and will cover the casing which remains in
the well, so that it is impossible to grapple
or grip the remaining casing for removing
it. It is contenmplatea by the present i-nven-
tion, -to overcome the foregoing difficulties,
in the following manner': When it is desired
to remove a-well casing,.tliespear and swivel 76.
elements shown in Fig-. 3 are employed .fbr
raising: the top section of. pipe sufficiently
to be grasped by a pipe jack (not shown),
whereupon the rests 15 are depressed, so
that the spear and swivel. element may. be so
lowered through the pipe. If the pipe is
separated at any place, the upper section
having been previously lifted there will
e-xist a space betweep the upper and lower
sections, so. that the rests 15 after-passing 8
through the upper section, :ill be forced
outward into the position shown in Fig. 3;
so that, when the spear element has been
lowered sufficiently, .it will be arrested by
contact of said rests with the top of the 90
lower section (see Fig. 3). At this stage .of
the operation, it is desired' to. grasp this
lower section and lift is slightly, for the
purpose of ascertaining'whether the pipe is-
disconnected at any other place therebelow, 95
and after thus raising this section, -aing
39 Mnay be lowered into position. around the
spear element, so as to depress'the rests 15,
when the spear is slightly raised, so that the
spear may then descend through this.lower 1
easing section, leaving the ring gn top of
said casing section. When the spear has
been sufficiently lowered, it-will "main rest
upon the upper end of a pipe section which
has been disconnected. and the last said pipe 105
section may be slightly raised, for the pu-
pose of locating other disconnected paces
in the casing. In gripping the pipe'sections,
for the purpose o raising them the swivel
element 11 is- rotated, through the medu in 10
of its suspending .element, in cntri-clok-
wise direction, so as to force the draw rod 12
downward, and'thereby force thejaws down-
ward on the wedge shaped jaw-sea.ting ele-
ment,.so as to separate the -as and force 115
them into engagement with th iniiers-
face of the pipe section, ths vtgiving the
jaw teeth 13' an initiatory hrild or bite in
the caii:g. The spear .is now raised,- and
the weight of the casniidraws the jaws f'f- -120
the, down upon the wedge shaped portion
25, against the action of the..spring 12'
thereby further- separating .the - jaws- and
cau ,ing tie teeth. 13' to bite deeper into the.
casing 125
SWheh it is desired to fret the spear from
the casing, the swivel element is rotated in
clockise direction,.tb reby raising the jaws
relative to the wedge shaped pQrtion 25 and
directing their teeth out of engagement .3o0
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Reference the current page of this Patent.
McConnell, Scott R. Internal Pipe-Gripper, patent, August 5, 1913; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth853625/m1/3/: accessed June 20, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.