Tool for Unscrewing Pipe-Joints from Wells Page: 4 of 4
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1,277,624
is connected to the sleeve 11 by right hand
threads and is driven from the rotary (not
shown) in a well known manner. The
upper end of the shaft 3 extends up through
5 the member 11, and carries the nut 13 to
prevent the detachment of said member
therefrom.
The anchor 6 has a plurality of slots 14
cut therethrough and spaced apart there-
10 around, and in these slots work the dogs 15
which are pivoted therein.
When the device is being let down into
the well it will be suspended from the stem
12, the nut 13 resting against the upper end
15 of the member .11 and the sloping, shoulder
5 of the shaft will force the dogs 15 out-
wardly against the casing 1 so as to hold the
device centered and direct the head 4 into
the upper end of the joint 2. Inasmuch
20 as these dogs sustain only the weight of the
anchor 6 in lowering the device, they will
not engage with the casing. When the de-
vice is. lowered and the head 4 is received
by the upper end of the joint 2, the weight
25 of the stem 12 will then be sustained by the
shoulder 8 and the dogs 15 will be forced
to engage with the casing 1 and will pre-
vent the anchor 6 from turning. When the
stem 12 is rotated it will operate through
30 the spur gears 10 to rotate the shaft 3 in
the reverse direction, causing the head 4 to
engage with the joint 2 and unscrew the
stem. Said joint may then be withdrawn
from the bore.
35 What I claim is:-
1. A device of the character described in-
cluding an anchor having a central bearing,
a member rotatable in said bearing, pipe.
engaging means carried by said member, en-
40 gaging means adapted to be held in engage-
ment with a well casing by said member to
prevent the 'rotation of said anchor, and a
driving stem operatively connected to said
member whereby the member may be ro-
45 tated through said stem and in the opposite
direction.
2. A device of the character described for
unscrewing the joints of a drill stem in-
cluding an anchor provided with a central
50 bearing and slots radiating therefrom, dogs
working through said slots, a rotary mem-
ber operating in said bearing and holding
said dogs projected through the slots to en-
gage with the well casing and prevent the
55 rotation of the anchor, means carried by the
rotary member to engage with the.drill stem
and rotate the same, a driving stem, and
means operatively connecting the stem withthe rotary member whereby the rotation of
the former operates to rotate the latter in 60
the opposite direction.
3. A device of the character described in-
cluding an anchor provided with a bearing,
a member rotatable in said bearing, pipe en-
gaging means carried by said member, means 65
carried by the anchor and held in engage-
ment with a well casing to secure the anchor
against rotation, a rotatable drive stem and
means operatively connecting said stem with
said rotatable member through which said 70
member is rotated from the stem but in the
opposite direction.
4. A device of the character described in-
cluding an anchor having a bearing and
member rotatable in said bearing whose 75
lower end is formed to engage with the drill
stem, means carried by the anchor and held
in engagement with the well casing by said
member to prevent the rotation of the an-
chor, a drive stem and means operatively 80
connecting said stem with said rotatable
member through which the rotation of the
stem is imparted to said member in the oppo-
site direction.
5. A device for unscrewing and withdraw- 85
ing pipe from wells including an anchor
having a central bearing and radiating slots,
a member rotatable in said bearing, whose
lower end is formed to engage with the pipe
joint, dogs pivoted in said slots and held in 90
engagement with the well casing by said
member, a drive stem, a train of gears
through which the rotation of the stem is
imparted to said member in the opposite
direction. 95
6. A device for unscrewing and withdraw-
ing pipe from wells including an anchor
having a central bearing and radiating slots,
a member rotatable in said bearing whose
lower end is formed into a head adapted 100
to engage in a pipe, dogs operating through
said slots and held in engagement with the
well casing by said member to prevent the
rotation of the anchor, a rotatable drive
stem and a train of gears through which the 105
rotation of said stem is imparted to said
member so as to rotate said member in the
opposite direction from the rotation of the
stem.
In testimony whereof I have signed my 110
name to this specification in the presence of
two subscribing witnesses.
JOSEPH R. MATULA.
Witnesses:
Orro voN ROSENBERG,
MAx REIssm.
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Reference the current page of this Patent.
Matula, Joseph R. Tool for Unscrewing Pipe-Joints from Wells, patent, September 3, 1918; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth1256796/m1/4/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.