Gripping Device. Page: 4 of 7
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UNITED STATES PATE 1FI@EOC9
JrOSEPH F. MOODY, OF BANGED, TEXAS.
GRIPPING DEVICE.Specifcation of Letters Patent.
Patented July 11, 1922.
Application filed December 17,.1920. Serial No. 431,443.
To all whom it may concern:
Be it known that I, JOSEPH F. Moonr, a
citizen of the United States, residing at
Ranger, in the county of Eastland and State
5 of Texas, have invented new and useful Im-
provements in Gripping Devices, of which
the following is a specification.
This invention relates to apparatus or ap-
pliances employed in connection with well
10 drilling machinery for gripping the casing
sections, pipes, etc., as they are being raised
or lowered, and the invention has for its
object to provide a novel and improved
means for holding a section while another
15 section is being coupled or uncoupled.
The invention also has for its object to
provide a means which operates automati-
cally to grip the pipe, casing or the like in
the event of the same starting to go down
20 too fast while being run in.
Other objects and advantages of the in-
vention will be pointed out in the detailed
description appearing hereinafter, and in
order that the invention may be better un-
25 derstood, reference is had to the accompany-
ing drawings forming a part of this specifi-
cation.
In the drawings,
Figure 1 is a plan view of the apparatus;
30 Fig. a is a central longitudinal section there-
of ; Fig: 3 is a cross-section on the line 3-3
of Fig. 1, and Fig. 4 is a horizontal sectional
view on the line 4-4 of Fig. 2.
Referring specifically to the drawings, the
35 supporting frame of the apparatus is com-
posed of laterally spaced, parallel side walls
5, and cross walls 6 connecting the same at
their ends, said side and end walls being
rigidly connected in- any suitable manner.
40 This frame is supported on cross beams 7 at
the top of the usual cellar 8 beneath the floor
9 of the derrick, and it is fastened down on
said cross beams by hook bolts 10.
Intermediate its ends, the supporting
45 frame carries two spaced cross members 11
and 12, the same being secured by trans-
verse bolts 13 passing through the side walls
5, the latter also having inturned bottom
flanges 14 on which the cross members seat.
50 To the inner faces of the side walls 5 are
secured vertical ribs 15 between which the
cross members 11 and 12 seat at their ends.
On the cross members 11 and 12 seats a
base 16 having a vertical opening 17 in
55 which are adapted to be seated wedge-shaped
gripping jaws 18 commonly known in theart as slips, the same being arranged in a
circular series so that the pipe or casing
sections may pass therethrough. The open-
ing 17 has a downward taper and the slips 60
18-are slidable therein, and hence when they
move downwardly in said opening they arc
crowded inwardly to grip the pipe or casing,
whereas when they move upwardly they re-
cede and release the latter. 65
The slips 18 are suspended by chains 19
or other suitable connections, from a ring
20, and between this ring and the top of
the slips is located a ring 21, the same being
supported by the chains and serving to hold 70
the slips in a circular series. Each slip is
suspended from the ring 20 by a chain 19,
and between said ring and the top of the
slip is located a spring 22, the latter being
coiled around the chain. The ring 21 is 75
split and has a normal tendency to expand,
whereby it holds the chains 19 spread to keep
the slips in contact at their outer surface
with the wall of the opening 17 when in
non-gripping position, the slips now extend- 80
ing only partly into the opening. Upon low-
ering the slips in the opening 17 they grip
the pipe or casing as hereinbefore described.
The springs 22 assist the downward move-
ment of the slips when the supporting ring 85
20 is lowered.
The ring 20 is carried by two vertical and
diametrically opposite supporting stems 23
passing through openings 24 in the base 16,
and connected at their lower ends, below 90
said base, to levers 25 which are pivotally
supported intermediate their ends by the
walls 5, the arrangement being such that
when the levers are swung the stems 23 move
upwardly or downwardly and thus elevate 95
or lower the ring 20 to raise or lower the
slips 18. As shown in Fig. 1, the levers 25
have lateral bends 26 intermediate their
ends which pass through apertures in the
walls 5, whereby the pivotal support of the 100
levers is had. The outer ends of the levers
25 have a connecting portion 27 so that they
may operate together.
To the levers 25 are connected springs 28
for swinging the same in a direction to move 105
the stems 23 downwardly to lower the ring
20 and allow the slips 18 to come to grip-
ping position. The levers 25 are normally
held in a position in which the ring 20 is
elevated and supporting the slips 18 in non- 110
gripping position. This holding means is a
counterweight 29 carried by a suspension1,422,289.
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Moody, Joseph F. Gripping Device., patent, July 11, 1922; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth1259419/m1/4/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.