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Патент USA US3056296

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Oct. 2, 1962
F. L. G|LLETT
3,056,287
CABLE ANCHOR
Filed OOÍ.. 2l, 1957
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Oct. 2, 1962
F. l.. GILLETT
3,056,287
CABLE ANCHOR
Filed Oct. 2l, 1957
2 Sheets-Sheet 2
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Patented Get. 2, 1952
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torque arm 28 and the lug 33 on the base y1t). This pres
3,956,237
CABLE ANCI-IGR
Frank L. Gillett, Sherman Üaiäs, Calif., assigner, by mesne
assignments, to Armee Steei Corporation, Middletown,
Üiiio, a corporation of Ühio
Filed Get. 21, 1957, Ser. No. 691,184
11 Claims. (Cl. 731-443)
sure capsule generally designated 34 includes a pair of
relatively movable plates or disks 35 and 36 defining a
ñuid pressure chamber 37 between them. A ñexible seal
ing member 28 prevents leakage between the parts 35 and
36. The upper plate 35 is connected by means of bolts
39 to the frame 40 which is pivoted at 41 to the lug 33
on the base 1t). Similarly the lower plate 36 is connected
This invention relates to apparatus for securing a cable
by means of bolts 42 to the cover 43 which is connected
at a location between its ends and for providing a measure 10 to the torque arm 28 by means of the pivot pin 44. From
of the tension load on the cable. Devices of this type are
this description it will be understood that when an upward
employed in connection with the drilling of wells; the
cable passes from the drawworks drum through the hoist~
ing blocks and is anchored by such a device near the
derrick door. The anchor device includes apparatus for
measuring the tension in the cable. A device of this gen
force is applied by the pin 44 to the cover 43, the fluid
body within the chamber 37 is pressurized in proportion
to the magnitude of the force exerted. Suitable piping
connections 45, 46 and 47 connect the interior of the ñuid
chamber 37 to the pipe 4S. This pipe 48 communicates
eral type is shown in the Spalding Patent 2,488,070,
granted November 15, 1949.
It is the principal object of this invention to provide
with the pressure gauge 49 which may be calibrated to
indicate tension in the cable.
Means are provided for connecting the load carrying
an improved cable anchor device of this type, the device 20 member 24 to turn as a unit with the drum 17 on the axis
including a snubbing drum which is rotatably mounted to
of the stub shaft 16. As shown in the drawings, this
facilitate transfer movement of the cable into the receiv
means includes the axially movable pin 51 which extends
ing system when desired, together with novel means for
through aligned apertures 52 and 53 provided in the drum
securing the drum against rotation and for measuring the
17 and load carrying member 24 respectively. The pin
torque load thereon. Another object is to provide a cable 25 may be shouldered as shown at 54 and provided with a
anchor device of this type in which the snubbing surface
handle 55. A retaining cotter pin 56 prevents accidental
of the drum is tapered to cause the cable to travel axially
withdrawal. When the pin 51 is in the operative position
thereon as the drum rotates. Another object is to provide
shown in FIGURE 5 the ring 25 and torque arm 2S are
a cable anchor device of this type having cable clamp
connected as a unit to the drum 17. When the pin 51
means mounted on a torque arm, together with means for 30 is withdrawn from the aligned apertures 52 and 53, the
applying a friction drag force to the cable as it passes
through the clamp means and around the drum during the
operation of feeding cable into the reeving system. Other
and more detailed objects and advantages will appear
hereinafter.
In the drawings:
FIGURE 1 is a side elevation showing a preferred em
bodiment of my invention.
FIGURE 2 is a sectional elevation taken substantially
on the lines 2_2 as shown in FIGURE 1.
FIGURE 3 is an enlarged sectional view of a portion
of FIGURE 1.
FIGURE 4 is a sectional elevation taken substantially
drum 17 is free to rotate on the bearings 18 and 19.
The clamp device 29 includes jaw 60 fixed on the torque
arm 2S and jaw 61 mounted on the movable carrier 62.
This carrier 62 is provided with apertures 63 which re
ceive a plurality of parallel studs 64. The upper ends
of the studs are threaded to receive clamping nuts 65.
The carrier 62 slides on the parallel studs 64 and the
extent of movement is limited by the position of the nuts
65. When the nuts 65 are tightened down, the cable 3i)
is clamped against movement between the jaws 60 and 6l.
Integral upstanding lugs 70 are provided on the torque
arm 2S and a cross pin 71 mounted in these lugs sup
ports brake arm 72 and brake lever 73. When a down
ward force is applied to the lever 73 the brake arm 72
on the lines 4_4 as shown in FIGURE 3.
FIGURE 5 is a sectional detail taken substantially on 45 is caused to swing about the pivot pin 71 and cause the
the lines 5-5 as shown in FIGURE 3.
nose portion 74 to exert a clamping force on the carrier
Referring to the drawings, the base 1t) is provided with
62.
a footing portion 11 having apertures 12 to receive anchor
In operation, several loops of the cable 30 are spooled
bolts 13. The base 10 is also provided with an upright
on the snubbing surface 23 of the drum 22. The active
portion 14 having a bore 15 to receive a stationary pintle 50 portion 32 of the cable extends upward to the hoisting
or stub shaft 16. A snubbing drum 17 is rotatably
blocks (not shown). A portion of the cable is received
mounted upon this stub shaft 16 by means of axially
between the clamping jaws 6G and 61. When it is de
spaced bearings 18 and 19. The bearings are received
sired to pass additional cable into the reeving system to
within the hub 20 of the drum 17.
replace worn cable cut from the end spooled on the
The outer periphery of the drum 17 is provided with 55 drawworks spooling drum, the torque transmitting con
a pair of axially spaced radial flanges 21 and 22 and an
necting pin 51 is withdrawn from the aligned apertures
inclined or tapered snubbing surface 23 extending between
52 and 53. The drum ‘17 is then free to turn on the
the flanges.
bearings 18 and 19. The nuts 65 are loosened to permit
A load carrying member generally designated 24 in
the cable 30 to slide between the gripping jaws 60 and
cludes a ring 25 rotatably mounted on the drum hub 20 60 61. The brake lever 73 is employed to exert pressure
by means of anti-friction bushings 26 and 27. The load
against the carrier 62 and thus supply a friction drag
carrying member 24 also includes the laterally extending
to the cable 30 as it passes between the jaws 611 and
torque arm 28 which is formed integrally on the ring 25.
61. When the desired footage of additional cable has
The torque arm 28 carries a releasable cable clamp device
been passed into the reeving system, the connecting pin
generally designated 29 which is aligned tangentially with 65 51 is reinserted into the apertures 52 and 53 and the nuts
the snubbing surface 23 at the large end of the taper. The
65 are tightened on the threaded studs 64 to clamp the
cable 30 extends from the storage reel 31 through the
cable 30 against movement relative to the jaws 60 and
clamp device 29 and passes around the snubbing surface
61. Tension in the active portion 32 of the cable 3i)
23 in a plurality of loops. The active portion 32 of the
then causes the torque arm 2S to apply a load to the
cable 34) extends upward to the hoisting blocks (not 70 hydraulic pressure capsule 34 and thereby pressurize ñuid
within the chamber 37 to an extent proportional to the
shown).
‘ A hydraulic pressure capsule is interposed between a
torque load on the drum 17. The tension load on the
3,05 ege?
cable is then accurately shown by the reading of the
a snubbing surface adapted to receive a plurality of loops
pressure gauge 49.
of cable, a load-carrying member turnably mounted co
axially of the drum, releasable means for connecting said
The usual reservoir 75, pump 76, check valve 77 may
be employed for maintaining a proper supply of duid
within the chamber 37 and for piping it to the pressure
gauge 49.
Having fully described my invention, it is to be under~
stood that l do not wish to be limited to the details set
forth herein, but my invention is of the full scope of the
appended claims.
l claim:
load-carrying member to move as a unit with said drum,
relatively movable clamp jaws tangentially aligned with
said snubbing surface, one of the jaws being fixed relative
to said load-carrying member, means engaging the other
jaw for clamping a portion of the cable between said
jaws, said means including brake means operable upon
release of said connecting means to apply a friction drag
to the cable as it moves onto the rotating drum, and load
measuring means operatively interposed between said
base, a drum rotatably mounted on the base and having
load-carrying member and said base.
a snubbing surface adapted to receive a plurality of
6. In a cable anchor device, the combination of: a
loops of cable, a load-carrying member turnably mount 15 base, a drum rotatably mounted on the base and having
ed coaXially of the drum, releasable means for connect
a tapered snubbing surface adapted to receive a plurality
ing said load-carrying member to move as a unit with
of loops of cable, a load-carrying member turnably
said drum, relatively movable clamp jaws tangentially
mounted coaxially of the drum, releasable means for
aligned with said snubbing surface, one of the jaws be
connecting said load-carrying member to move as a unit
ing fixed relative to said load-carrying member, means
with said drum, relatively movable clamp jaws tangen
engaging the other jaw for clamping a portion of the
tially aligned with said snubbing surface at the large end
cable between said jaws against movement, and load
of the taper, one of the jaws being fixed relative to said
measuring means operatively interposed between said
load-carrying member, means engaging the other jaw for
1. In a cable anchor device, the combination of: a
load-carrying member and said base and having a part
clamping a portion of the cable between said jaws. said
subjected to force proportional to the torque load on 25 means including a brake lever operable upon release of
said drum.
said connecting means to apply a friction drag to the
2. ln a cable anchor device, the combination of: a
cable as it moves onto the rotating drum, and a hydraulic
base, a drum rotatably mounted on the base and having
pressure capsule operatively interposed between said load
a tapered snubbing surface adapted to receive a plurality
carrying member and said base.
of loops of cable, a load~carrying member turnably 30
7. In a cable anchor device, the combination of: a
mounted coaxially of the drum, releasable means for
base, a drum rotatably mounted on the base and having
connecting said load-carrying member to move as a unit
a snubbing surface adapted to receive a plurality of loops
with said drum, relatively movable clamp jaws tangentially
of cable, a ring turnably mounted upon the drum coaXially
aligned with said snubbing surface at the large end of
thereof and having a torque arm, releasable means in
the taper, one of the jaws being fixed relative to said 35 cluding a retractable pin for connecting said ring to turn
load-carrying member, means engaging the other jaw for
clamping a portion of the cable between said jaws against
movement, and load measuring means operatively in
terposed between said load-carrying member and said base
and having a part subjected to force proportional to the 40
torque load on said drum.
3. In a cable anchor device, the combination of: a
base, a drum rotatably mounted on the base and having
as a unit with said drum, relatively movable clamp jaws
tangentially aligned with said snubbing surface, one of
the jaws being fixed relative to said torque arm, means
engaging the other jaw for clamping a portion of the
cable between said jaws, said means including a brake
lever operable upon release of said retractable pin to
apply a friction drag to the cable as it moves onto the
rotating drum, and a hydraulic pressure capsule operaf
tively interposed between said load-carrying member and
said base and having an internal Huid body subjected to
a snubbing surface adapted to receive a plurality of loops
of cable, a load-carrying member turnably mounted co
aXially of the drum, releasable means for connecting said
pressure proportional to the torque load on said drum,
load-carrying member to turn as a unit with said drum,
when said pin is engaged.
relatively movable clamp jaws tangentially aligned with
8. ln a cable anchor device of the type described, the
said snubbing surface, one of the jaws being ñXed rela
combination of: a base, a drum rotatably mounted on
tive to said load-carrying member, means engaging the 50 the base and having a snubbing surface adapted to re
other jaw for clamping a portion of the cable between
ceive a plurality of loops of cable, a load-carrying mem
said jaws against movement, and a hydraulic pressure
ber turnably mounted coaXially of the drum, releasable
capsule operatively interposed between said load-carrying
member and said base and having an internal ñuid body
subjected to pressure proportional to the torque load on
said drum.
4. In a cable anchor device, the combination of: a base,
a drum rotatably mounted on the base and having a
means for connecting said load-carrying member to move
as a unit with said drum, clamp means on the load-carry
ing member to clamp the cable, brake means on the load
carrying member operable upon disengagement of said
clamp means to apply a friction drag to the cable as it
moves onto the rotating drum, and load measuring means
tapered snubbing surface adapted to receive a plurality
interposed between said load-carrying member and said
of loops of cable, a ring turnably mounted upon the 60 base confining a fluid body under pressure proportional
drum coaxially thereof and having a torque arm thereon,
to the torque load applied by the cable to the drum.
means including a removable pin for selectively connect
ing said ring to turn as a unit with said drum, relatively
movable clamp jaws tangentially aligned with said snub
9. In a cable anchor device of the type described, the
combination of: a base, a drum rotatably mounted on
the base and having a snubbing surface adapted to re
bing surface at the large end of the taper, one of the jaws 65 ceive a plurality of loops of cable, a load-carrying mem
being ñxed relative to said torque arm, means engaging
ber turnably mounted coaxially of the drum, releasable
the other jaw for clamping a portion of the cable between
means for connecting said load-carrying member to move
said jaws against movement, and a hydraulic pressure
as a unit with said drum, clamp means on the load
capsule having a first part connected to the base and a
carrying member to clamp the cable, brake means in
second part connected to said torque arm, said first and 70 cluding a lever pivotally mounted on the load-carrying
second parts defining between them an internal fluid body
member and operable upon disengagement of said clamp
subjected to pressure proportional to the torque load on
means to apply a friction drag to the cable as it moves
said drum.
onto the rotating drum, and a hydraulic pressure capsule
5. In a cable anchor device, the combination of: a
interposed between said load-carrying member and said
base, a drum rotatably mounted on the base and having 75 base and acting to limit relative movement therebetween,
3,056,287
5
said ,capsule containing a -fluid body subjected to a pres
sure proportional to the torque load applied by the cable
to the drum.
10. In `a cable anchor device of the type described, the
6
surface adapted to receive a loop of cable, a torque arm
element, means rotatably supporting the said elements on
said base for independent co~axial turning movement, re~
leasable means for engaging said elements in non-rotative
relation with respect to each other, clamp means posi
tioned tangentially of the snubbing drum surface on said
torque arm element to clamp said cable, brake means in
cluding a lever operable upon disengagement of said re
combination of: a base, a drum element having a snubbing
surface adapted to receive Ia loop of cable, a torque arm
element, means rotatably supporting the said elements on
said base for independent co-aXial turning movement, re
leasable means for engaging said elements in non-rotative
leasable means and said clamp means to apply a friction
relation with respect to each other, clamp means posi 10 drag to the cable as it moves onto the rot-ating drum, and
tioned tangentially of the snubbing surface of said drum
force measuring means interposed between the base and
element on said torque arm element to clamp the cable,
the torque arm element to measure the pull on the cable
brake means operable upon disengagement of said releasa
when the two elements are engaged as a unit and the cable
ble means and said clamp means to apply a friction drag
clamped by said clamp means.
to the cable as it moves onto the rotating drum, and force 15
measuring means interposed between the base and the
References Cited in the ñle of this patent
torque arm element to measure the pull on the cableI when
UNITED STATES PATENTS
the two elements are engaged as a unit and the cable is
clamped by said clamp means.
11. In -a cable anchor device of the type described, the 20
combination of: a base, a drum element having a snubbing
Re. 24,092
Decker ______________ __ Nov. 22, 1955
2,488,070
2,807,957
Spalding ____________ __ Nov. 15, 1949
Decker ________________ __ Oct. 1, 1957
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