Power tong

A new power tong for rotating tubular members for make-up (connection) and break-out (disconnection) operations. In one aspect such a tong has at least one movable jaw with a smooth surface gripping element thereon and pre-load apparatus for applying a pre-load force to a movable jaw so that the jaw does not slip on a tubular to be rotated and so it does not mark or damage the tubular. In one aspect the pre-load apparatus includes a first pre-load device at one end of a movable jaw for breakout operations and a second pre-load device at another end of the jaw for make-up operations. In one aspect a power tong which has unique smooth surfaced jaw inserts made, e.g., of aluminum. In one aspect a single pivotable pre-load cylinder, fixed to rotary, pivots for pivotable connection to one jaw or the other. This can be done manually or a powered smaller piston/cylinder may be used to pivot the pre-load cylinder. In one aspect a jaw unit which comprises a jaw holder and a jaw movable with respect to said jaw holder, characterized in that said jaw is slidably mounted on said jaw holder.

BACKGROUND OF THE INVENTION 
1. Field of the Invention 
This invention is directed to apparatus and methods for aligning wellbore 
tubulars; and to power tongs used in making and breaking joints of tubular 
members such as wellbore casing and tubing; to parts thereof; including, 
but not limited to gripping elements, and methods of their use. 
2. Description of Related Art 
During the drilling of oil and gas wells and the production of materials 
therefrom, various operations require the connection and disconnection of 
successive lengths of threaded tubulars such as pipe, casing, or tubing. 
Tools known as tongs are used to "make" and "break" such connections. 
Certain known power tongs have a body, a rotary rotatably mounted in said 
body and at least one active jaw which, on rotation of the rotary is 
cammed against a pipe in the rotary and grips it for rotation with the 
rotary. In known arrangements the camming action is generated by a cam 
member which is bolted to the rotary and is shaped so that the active jaw 
is cammed against the pipe on rotation of the rotary relative to the 
active jaw in one sense and will be released on rotation of the rotary 
relative to the active jaw in the opposite sense. 
With known tongs high torques are applied to tubulars due to combinations 
of factors such as thread sealing requirements, the presence of corrosion, 
the existence of distortion, and pipe size and weight. Both in the "make" 
direction of rotation when a shoulder is suddenly encountered, and in the 
"break" direction at initial engagement of the tong and disengagement of 
the threads high shock forces may arise; e.g., with a power-driven tong, 
in excess of 50,000 foot-pounds of torque may be exerted, while relatively 
small die elements on jaws of the tong engage the pipe with extremely high 
force loadings. Slippage occurs and pipe surfaces become marred, marked, 
indented, or otherwise damaged. 
Dies for gripping jaws have been provided with multiple serrations, or 
penetration features, to provide the interference contact at the joint 
surface. Grip element penetration into the joint surface is limited and 
controlled. The distribution and balance of grip element energizing forces 
are critical factors in the design, development and evaluation of such 
tong mechanisms. Linkages, levers, wedges, and cams are used to balance 
force components. Grip elements, or dies, are accurately disposed within 
carrier bodies, or jaws, which span a circumferential segment of the joint 
surface. 
Uneven die loading can cause excessive indentation, marring or damage to a 
tubular surface. Drag or braking devices are used in certain tongs to 
effect proper biting of the dies relative to the pipe. The head or other 
member supporting the dies is frictionally restrained to insure that the 
dies do not simply rotate with the rotary as the rotary is driven. 
Other tongs use an endless belt, chain or flexible material loop for 
gripping a tubular. Such tongs are disclosed in U.S. Pat. Nos. 3,799,010; 
3,906,820; 3,892,140; 4,079,640; 4,099,479; and 4,212,212. There are a 
variety of problems associated with certain of these tongs: 
Endless chain is changed to accommodate tubulars of different size or 
apparatus is provided to maintain tubulars on a centered position for 
torque monitoring. 
Chain links can slip at high torques. 
Pivotable arms or gate members that fail to hold a tubular within the tong 
body allow the tubular to be thrown out from the tong. 
Relatively fragile tubulars can be collapsed by high loads. 
Slippage (which can cause galling and other damage to tubulars) occurs if 
the gripping element (belt, chain, etc.) loading mechanism does not 
maintain an adequate pre-load force on the tubular. 
Jaw/die tongs and the belt/chain tongs are used with relatively hard and 
rigid metal tubulars such as casing and tubing. If these tongs are used 
with thick tubulars or tubulars made from relatively "softer" metals or 
from premium metals such as high alloy steels or low carbon steels or 
tubulars made from non-metal materials such as fiber glass, they often 
literally chew up the tubular. The use of strap wrenches is inadequate 
since the torque applied with such wrenches cannot be precisely 
controlled. 
Certain tubulars are treated with a rust or corrosion resistant material or 
coating. If the coating is indented, gouged, or broken, its protective 
purpose is defeated. Producing enough force in a tong to join such 
tubulars while not injuring a protective coating presents a dilemma. 
SUMMARY OF THE PRESENT INVENTION 
The present invention, in certain embodiments, discloses a power tong for 
joining tubulars so that marking of, indentation of, and surface injury to 
tubulars are reduced or eliminated. In one aspect a power tong is provided 
and a method of its use for handling tubulars coated with a 
corrosion-resistant material which should not be broken or penetrated. In 
one embodiment such a tong has one or more gripping jaws with gripping 
elements made of aluminum alloys, zinc, zinc alloys, aluminum, brass, 
bronze, cermet, plastic, fiberglass, metal alloys, or a combination 
thereof which present a smooth face (straight or curved) to a tubular 
without any teeth, pointed projections, or toothed dies. In one aspect the 
gripping elements are releasably connected directly to jaws. In another 
aspect the gripping elements are releasably connected to a jacket or 
holder which itself is releasably connected to a jaw. 
In certain aspects to achieve desired gripping forces, the gripping 
elements are relatively long longitudinally and the jaws are 
correspondingly enlarged or appropriate extension apparatus is connected 
thereto. With certain gripping elements the surface for contacting the 
tubular is flat; with other elements the surface is radiused to correspond 
to the curve of an outer tubular surface of a tubular to be rotated. 
In order to effectively grip a tubular with gripping elements without 
teeth, points, or projections so that slippage is prevented, a larger 
normal force between the jaw and the tubular is needed to maintain 
gripping-element pipe contact. Pre-loading of jaws with one or more of 
these gripping elements is achieved, in certain embodiments of this 
invention, with a pre-load cylinder connected between a fixed gripping jaw 
and a movable gripping jaw. The cylinder applies a continuous pre-load 
force on the movable jaw which is not concentrated enough to injure the 
tubular but is large enough to develop sufficient friction to prevent 
slippage. In one aspect the force applied by the cylinder is controllable 
and is adjustable as desired. In one aspect two pre-load cylinders are 
used, each connected to a different fixed jaw and one at each end of a 
movable jaw, so that no cylinder movement is required to change modes, 
e.g. from make-up to breakout. In one aspect one cylinder is used which 
can be switched from one end of a movable jaw to the other to switch modes 
of operation. 
In one aspect the cylinder(s) are powered by a small air-driven hydraulic 
pump with an hydraulic fluid reservoir mounted on a plate on the movable 
or fixed jaw. Air is supplied to activate a motor of the pump and the pump 
then provides hydraulic fluid to move a piston of the hydraulic 
cylinder(s). The motion of the cylinder moves the movable jaw on its 
roller to travel to a pre-load position on the cam. The cylinder applies 
pressure until the hydraulic pressure is released. A hydraulic fluid 
accumulator and a valve may be used to maintain hydraulic pressure at all 
times so that the cylinder(s) continuously maintain the desired load on 
the jaw until the air supply to the pump is removed. 
In another aspect the cylinders are connected to a rotary of the tong or to 
any other member that rotates with the rotary rather than to a fixed jaw. 
Such a pre-load system may, according to this invention, be used with any 
tong including a tong that does use toothed dies. 
In one embodiment the present invention discloses a gripping arrangement 
for a tong with a sheet of grit which is preferably bonded to a carrier 
plate. In another embodiment the gripping arrangement comprises a layer of 
flexible material having a smooth flat surface or a surface with ridges 
and valleys, for example in the fashion of the surface of a file. The 
flexible material, in one aspect, is metal, for example sheet aluminum, 
zinc, brass, bronze, zinc alloy, aluminum alloy, stainless steel, or steel 
having a thickness of about 1.5 mm. The layer of flexible material may be 
used in conjunction with a carrier plate or on its own. In a further 
embodiment the gripping arrangement may comprise a layer of perforate 
material one of both surfaces of which are preferably coated with grit to 
facilitate adhesion. The layer will typically be formed from metal having 
a thickness of about 1.5 mm. The layer may be used in conjunction with a 
carrier plate or used on its own. In yet another embodiment the gripping 
arrangement may comprise a layer of expanded mesh, e.g. metal mesh, which 
has been flattened. One or both surfaces of the expanded mesh may be 
coated with grit and the layer may be used in conjunction with a carrier 
plate or used on its own. The grit may comprise, for example, diamond 
dust, particles of silicon, zircon, tungsten carbide and mixtures thereof. 
The gripping arrangement may comprise end plates which are attached to the 
carrier plate. Preferably, the carrier plate is provided with side flanges 
for insertion into a jaw holder. The present invention also provides a jaw 
assembly fitted with a gripping arrangement in accordance with the present 
invention. Preferably, the jaw assembly includes a jaw holder having an 
arcuate recess which accommodates an arcuate pad of resilient elastomeric 
material which supports said gripping arrangement. Advantageously, at 
least one shim is provided which is disposed between said arcuate pad of 
resilient elastomeric material and said gripping arrangement. The shim 
will be flexible and generally from 0.5 mm to 1.0 mm thick and made from 
sheet metal. The present invention also provides a tong fitted with at 
least two such jaw. 
In one embodiment the present invention discloses an apparatus for aligning 
tubulars and includes a guide on one of a power tong and a backup tong. In 
one embodiment the apparatus has a socket centralizer mounted on said one 
of said power tong and said backup tong. In one aspect, said one of said 
power tong and said backup tong is said power tong. In another embodiment, 
the apparatus includes a power tong and a backup tong, and the guide is 
mounted on the power tong and apparatus is provided to maintain the power 
tong and the backup tong in a certain juxtaposition during a stabbing 
operation. Preferably, said apparatus includes locating rods on one of the 
power tong and the backup tong and blocks shaped to receive at least the 
ends of the locating rods on the other of the power tong and the backup 
tong. Advantageously, the backup tong is provided with at least two 
prismatic jaw assemblies to locate the backup tong in fixed juxtaposition 
with respect to a tubular being gripped. 
The present invention, in one aspect, provides a jaw unit for use in a 
tong, which jaw unit comprises a jaw holder and a jaw movable with respect 
to said jaw holder, characterized in that said jaw is slidably mounted on 
said jaw holder. Preferably, said jaw is slidable with respect to said jaw 
holder about an arcuate path. Advantageously, said jaw has a gripping 
surface which is substantially arcuate for gripping the surface of a 
tubular and the center of curvature of such arcuate path lies between the 
center of curvature of said grip ping surface and said arcuate path. The 
gripping surface may be a continuous surface or defined by several spaced 
apart gripping elements. Preferably, the center of curvature of said 
arcuate path lies between the center of curvature of said grip ping 
surface and said gripping surface. Advantageously, the center of curvature 
of said arcuate path is substantially midway between the center of 
curvature of said gripping surface and said gripping surface. Preferably, 
one of said jaw and said jaw holder is provided with an arcuate track 
which defines said arcuate path, and the other of said jaw and said jaw 
holder is slidably mounted in said arcuate track. 
The present invention also provides a jaw assembly comprising two jaw units 
in accordance with the present invention. Preferably, said jaw units are 
mounted for pivotal movement about a common pivot shaft. Advantageously, 
said jaw assembly includes means which bias said jaw units apart. The 
present invention also provides a rotary fitted with a jaw unit in 
accordance with the present invention, a rotary fitted with a jaw assembly 
in accordance with the present invention, and a tong fitted with a rotary 
in accordance with the present invention. 
Traditionally, a rotary is made from three separate pieces, i.e. a top 
section, a bottom section and a peripheral wall. Each section has to be 
carefully made and machined to ensure that all three sections can be 
bolted together. This involves considerable skilled work and consequently 
a rotary is a relatively expensive item. In order to help overcome this 
the present invention provides a rotary formed as a one piece casting. 
One of the features of existing tongs is that their rotaries are difficult 
to furnish. Thus, routine maintenance usually involves dismantling the 
whole rotary, checking the parts and reassembling the whole. While this is 
a straightforward procedure in the clean conditions of a workshop it can 
be problematic when carried out in a muddy field, in sand or in snow. The 
present invention aims to help solve this problem and provides a rotary 
which comprises a top section, a bottom section, and a peripheral wall 
therebetween, characterized in that at least one of said top section and 
said bottom section is provided with an elongate slot which, when said 
rotary is in use, accommodates a pivot shaft on which a jaw assembly can 
be pivotally mounted. 
Jaw holders and jaws for tongs are traditionally machined from a solid 
piece. This is a comparatively expensive procedure. The present invention 
proposes to make such parts from a stack of individually cut laminations. 
In one aspect, the laminations are cut with a laser from sheet steel. The 
stack of laminations is then, for many purposes, welded together along 
their sides and/or bolted together and/or glued together. Mass produced 
laminations are relatively inexpensive and an acceptable final product is 
produced at a fraction of the cost of a product machined from the whole. 
It is, therefore, an object of at least certain preferred embodiments of 
the present invention to provide: 
New, useful, unique, efficient, nonobvious devices, parts thereof, and 
methods for rotating tubular members in wellbore operations; 
Such methods and devices including a power tong with at least one jaw with 
at least one tubular gripping element having a smooth gripping surface 
(flat or curved) and, in one aspect, such an element which is flexible; 
Such gripping elements with grit or mesh thereon; 
Such methods and devices including apparatus to apply a pre-load to a 
gripping element carrier or jaw so the gripping element will adequately 
grip the tubular without slipping on it or damaging it; and 
Such methods and devices wherein a single pre-load apparatus is movable to 
provide a pre-load on multiple jaws or gripping elements; or each such jaw 
or gripping element has its own pre-load apparatus; 
New, useful, unique, efficient, nonobvious devices and methods for aligning 
tubulars in wellbore operations. 
Certain embodiments of this invention are not limited to any particular 
individual feature disclosed here, but include combinations of them 
distinguished from the prior art in their structures and functions. 
Features of the invention have been broadly described so that the detailed 
descriptions that follow may be better understood, and in order that the 
contributions of this invention to the arts may be better appreciated. 
There are, of course, additional aspects of the invention described below 
and which may be included in the subject matter of the claims to this 
invention. Those skilled in the art who have the benefit of this 
invention, its teachings, and suggestions will appreciate that the 
conceptions of this disclosure may be used as a creative basis for 
designing other structures, methods and systems for carrying out and 
practicing the present invention. The claims of this invention are to be 
read to include any legally equivalent devices or methods which do not 
depart from the spirit and scope of the present invention. 
The present invention recognizes and addresses the previously-mentioned 
problems and long-felt needs and provides a solution to those problems and 
a satisfactory meeting of those needs in its various possible embodiments 
and equivalents thereof. To one skilled in this art who has the benefits 
of this invention's realizations, teachings, disclosures, and suggestions, 
other purposes and advantages will be appreciated from the following 
description of preferred embodiments, given for the purpose of disclosure, 
when taken in conjunction with the accompanying drawings. The detail in 
these descriptions is not intended to thwart this patent's object to claim 
this invention no matter how others may later disguise it by variations in 
form or additions of further improvements.

DESCRIPTION OF EMBODIMENTS PREFERRED AT THE TIME OF FILING FOR THIS PATENT 
FIGS. 1A-1C show a typical prior art power tong that uses fixed jaws and a 
movable jaw to grip pipe for tubular disconnecting and connecting 
operations. An outer case houses a powered rotary to which the jaws are 
mounted. A cam surface of the rotary moves a movable (ACTIVE or MASTER) 
jaw into (and away from) gripping contact with a tubular, e.g. pipe. Each 
jaw has toothed gripping inserts to facilitate engagement with the surface 
of the tubular (see FIG. 1B). FIG. 1C shows the tong in an "OPEN" position 
in which the tubular is not gripped. 
The tong shown in FIG. 1A is a Weatherford Model 14.5-50 High Torque Tong. 
The brochure "New ! Weatherford Model 14.5-50 High Torque Tong," (1991) 
and the manual entitled "Model 14.5-50 Hydraulic Power Tong Installation, 
Operation and Maintenance" (1993) are submitted herewith and incorporated 
herein fully by reference for all purposes. It is to be understood that 
the teachings of the present invention are applicable to any tong and any 
tong system that has one or more gripping elements or jaws and that the 
Model 14.5-50 tong is shown here for illustrative purposes and not by way 
of limitation of the scope of the present invention. 
As shown in FIG. 2A a system 10 according to the present invention includes 
a power tong 100 according to the present invention which is like the tong 
of FIG. 1A but which also includes a unique jaw system 110 with inserts 
150 on fixed jaws 120 and insert 152 on movable jaw 122 and at least one 
jaw pre-load assembly like that shown in FIG. 5A. The system 10 includes a 
free floating backup tong 12. 
As shown in FIGS. 2B and 2C, rods 112 are connected to the movable jaw 122. 
The inserts 150 are on fixed jaws 120 and the insert 152 is on a movable 
jaw 122 (corresponding to the fixed jaws and active jaw, respectively, of 
the tong of FIG. 1A). 
Stops 124 hold jaws 120 and prevent sideways insert movement. The stops 124 
may be welded to the jaw or otherwise secured. Removable bolts may be used 
instead of the stops 124. The stops 126 perform the same functions. A 
right angled member 127 (FIG. 3C) maintains a roller 135 rotatably in 
place in holes 123, 125. Holes 129 either receive a projection of an 
insert to maintain the insert in place or a pin extends through the hole 
129 into the insert to accomplish this. 
FIGS. 4A-4G illustrate an alternative jaw mounting system in which holders 
are interposed between jaw bodies and inserts. The holders protect the 
jaws from damage if the inserts wear down and a variety of different types 
and/or sizes of inserts may be used with and interchanged on a single 
holder. In one aspect it is within the scope of this invention to use 
these holders to mount conventional toothed dies to a tong jaw and to use 
them for easy substitution of new and/or different dies. 
FIG. 4A shows a jaw system 400 for a tong (like the tong of FIG. 2A) which 
has two fixed jaws 402 and a movable (movable toward and away from a 
tubular to be gripped 403) jaw 404. Each jaw 402 has a jaw body 405 with a 
holder 406 secured thereto. In one aspect dovetail keys 407 secured to the 
holder or releasably mounted thereto fit in corresponding slots 408 of the 
jaw bodies 405 to releasably mount the holder 406 to the body. In one 
aspect dovetail keys 409 releasably mount the holders 406 to jaw bodies 
405. The dovetail keys 409 are releasably held in corresponding recesses 
411 in the holders 406. One or more dovetail keys 409 may be used (two 
shown for each holder 406). 
Similarly a holder 414 is mounted to a jaw body 415 of the jaw 404 and 
dovetail members 416 are received and held in corresponding slots 417. 
An insert 420 has dovetail keys 421 received and held in corresponding 
slots 422 of the holder 414. The insert 420 is shown as a single unitary 
insert but a plurality of individual inserts (either abutting or spaced 
apart) may be used secured to the jaw body 415. 
It is preferred that the insert 420 extend for an arc of at least 40 
degrees and most preferably at least about 90 degrees. It is preferred 
that each insert 410 extend for an arc of at least 20 degrees and most 
preferably at least about 60 degrees. In another aspect it is preferred 
that the combined arcs of the three inserts in FIG. 4A extend for at least 
180.degree. of the total 360 degree circumference of the tubular 403 and 
most preferably for at least 20 degrees. 
FIG. 4D shows the insert 420. 
FIG. 4E shows the insert 410. 
FIGS. 4F and 4G shows a key 409. 
FIG. 5A shows a tong system 500 with a tong having a movable rotary 502, 
fixed jaws 504, 505, and a movable jaw 506 (remainder of tong, not shown, 
like the tong of FIG. 2A; like the tong of FIG. 1A, but with the added 
features discussed here). Pins 520 pin the fixed jaws to the rotary. 
Inserts 522 on the fixed jaws 504, 505 are like the inserts described 
herein for other fixed jaws. Insert 524 on the movable jaw 506 is like 
other inserts described herein for movable jaws. A pre-load cylinder 508 
to assist in make-up is pivotably connected at one end to the fixed jaw 
505 and at the other end to the movable jaw 506. A pre-load cylinder 510 
to assist in break-out is pivotably connected at one end to the fixed jaw 
504 and at the other end to the movable jaw 506. It is within the scope of 
this invention for the ends of cylinders connected to the fixed jaws to 
instead be secured to the rotary or to a support ring or other member that 
rotates with the rotary. It is within the scope of this invention to 
employ one cylinder interchangeable between the positions of the cylinders 
508 and 510 (FIG. 5A) or one cylinder connectible to the fixed jaw 506 at 
one end for break-out and at the other end of the fixed jaw 506 for 
make-up with the other cylinder end secured to the rotary. Rollers 530 
rotatably mounted on the movable jaw 506 co-act with cam surfaces 532 on 
the rotary 502 to move the jaw 506 to operative and inoperative positions. 
A control system 600 directs fluid for actuating the pre-load cylinders to 
and from the cylinders. In a system with one cylinder a simpler control 
system is used which applies fluid to the cylinder as needed and extracts 
it therefrom as desired. 
The system 600 has a directional control valve 602 that directs fluid from 
a reservoir 608 in lines 604, 606 to one or both cylinders or from one or 
both cylinders. An accumulator 610 holds sufficient hydraulic fluid under 
pressure to maintain desired continuous pressure levels on the pre-load 
cylinders so that the cylinders maintain the desired pre-load force 
without interruption or decay due to fluid bleed-off. 
A bleed valve 620 functions to selectively release pressure from the 
pre-load cylinders following make-up or break-out. A pump 630 pumps 
hydraulic fluid from the reservoir 608 to a line 631, in a line 632 to the 
accumulator 610, in a line 633 to the directional control valve 602, and 
in lines 634 and 635 to (and from) the pre-load cylinders 508 and 510. A 
check valve 638 in a line 637 from the reservoir 608 prevents fluid from 
flowing back into the reservoir. A check valve 639 in the line 631 insures 
that the pump 630 pumps fluid only from the reservoir and prevents fluid 
from the cylinder 508, 510 and/or from the accumulator 610 from flowing 
back to the pump 630 and to the reservoir 608. 
Air in a line 640 selectively applied with a control system 650 (e.g. 
mounted on the rig floor, on the tong or remote controlled) selectively 
actuates the pump 630 to pump fluid through the valve 602 to the pre-load 
cylinders. The directional control valve 602 is either manually operated 
or operated by remote control. Correct fluid pressure is monitored with a 
gauge 651. 
As shown in FIG. 5B, the system 500 is being pre-loaded for gripping a 
tubular 650. Fluid is applied into the pre-load cylinder 508 to overcome a 
spring force of a spring 551 and allow a piston 552 to move the movable 
jaw 506 away from the fixed jaw 505. The directional control valve 602 is 
set to permit fluid to be pumped in the line 634 to the pre-load cylinder 
508. 
Simultaneously fluid is flowing out in line 635 from the pre-load cylinder 
510, allowing its spring 553 to urge its corresponding piston 554 inward 
into the pre-load cylinder 510 thereby pulling the end of the movable jaw 
toward the fixed jaw 504 and increase the loading of the jaw 506 on the 
tubular 650. 
As shown in FIG. 5C the tubular 650 has been gripped due to the action of 
the pre-load cylinder 510 with a suitable pre-load force (e.g., but not 
limited to, about 500, 1000, 5000, 10000 or 50000 pounds of force). This 
force is sufficient that when the rotary 502 of the tong is rotated the 
jaws do not slip on the tubular 650; but the pre-load force is 
sufficiently low that the jaws do not mark or damage the tubular 650. 
FIG. 6A shows an insert 700 according to the present invention which is 
made of aluminum. It is within the scope of this invention for the inserts 
disclosed herein to be made any suitable material of suitable hardness, 
including, but not limited to, zinc, copper, brass, bronze, soft steels, 
or any suitable bearing material or metal alloy of aluminum, zinc, or 
other suitable metals. Optional teeth or projections at any desired angle 
may be provided on a curved surface 702 or it may be smooth. The surface 
702 may be curved to corresponding to the curved outer surface of a 
tubular. Alternatively the surface 702 may be straight and flat. 
FIG. 7A shows an insert 800 according to the present invention which is 
made of aluminum. It is within the scope of this invention for the inserts 
disclosed herein to be made any suitable material of suitable hardness, 
including, but not limited to, zinc, copper, brass, bronze, soft steels, 
or any suitable bearing material or metal alloy of aluminum, zinc, or 
other suitable metals. Optional teeth or projections at any desired angle 
may be provided on a curved surface 802 or it may be smooth. The surface 
802 may be curved to corresponding to the curved outer surface of a 
tubular. Alternatively the surface 802 may be straight and flat. 
FIG. 8 shows schematically a top view of a power tong according to the 
present invention. A power tong T has an hydraulic motor M with 
control/monitor apparatus C on a tong case S. A movable jaw J is moved and 
rotated by a rotary R which is moved by interconnection, via appropriate 
gearing, by the motor M. Fixed jaws F and G are secured to the rotary R. A 
first pre-load cylinder D connects the movable jaw J to the fixed jaw G 
for applying a pre-load to the movable jaw for make-up operations. A 
second pre-load cylinder L connects the movable jaw J to the fixed jaw F 
for applying a pre-load to the movable jaw for break-out operations. An 
insert I (any insert disclosed herein) is secured to the movable jaw J and 
inserts K (any insert disclosed herein) are secured to the fixed jaws F 
and G. 
FIG. 9 shows a tong jaw 450 according to the present invention with an 
insert 454 (any insert disclosed herein) and rods 452 secured thereto, 
e.g. by welding. The rods 452 provide a member to which either a cylinder 
body or a piston of a pre-load piston cylinder apparatus is connectible. 
Instead of the rods 452 as shown which extend from above the jaw 450 to a 
point below it, only rod sections may be used secured to one or both sides 
of the jaw to provide a securement member for an end of a pre-load 
apparatus. 
According to the present invention a variety of apparatuses and devices may 
be employed to pre-load a tong jaw having one or more smooth faced 
gripping insert elements thereon. In one aspect a manually activated 
pre-load cylinder is used which has fluid or material manually introduced 
therein to apply a pre-load or manually removed therefrom to release a 
pre-load. In another aspect a pre-load cylinder is pivotably secured at 
one end to a rotary or part thereof and the other end is releasably 
connectible to either end of a movable jaw so that a pre-load may be 
applied, selectively, to either end of the movable jaw for make-up or 
break-out operations as desired. In one aspect such a pre-load cylinder 
has a rod with an end member receivable in and movable in a slot in the 
movable jaw or there are recesses at either end of the jaw for holding the 
end member of the rod so that a pre-load can be applied. A secondary small 
cylinder may be used to selectively move the pre-load cylinder in the jaw 
slot or it can be moved manually. In another embodiment the tong's movable 
jaw has one or more upwardly projecting lugs engageable by a forked piston 
rod end of a pre-load piston/cylinder that is attached to the rotary. The 
rotary is rotated so that the jaw is cammed into the pipe to be rotated in 
a pre-load position and then the forked rod is removed for further tong 
operations. 
Referring to FIGS. 10 to 14 of the drawings there is shown a jaw assembly 
which is generally identified by the reference numeral 1001. 
The jaw assembly 1001 comprises a jaw holder 1002 which is provided with an 
arcuate recess 1003 which accommodates an arcuate pad 1004 of resilient 
elastomeric material. A block 1005 of steel is molded into each end of the 
arcuate pad 1004 as shown. Three thin shims 1006 of metal each having a 
thickness of about 0.5 mm are positioned on the inner surface of the 
arcuate pad 1004 and support an insert or gripping arrangement 1007 which 
comprises a carrier plate 1008 and a friction layer 1009. The carrier 
plate 1008 has side flanges 1010 and 1011 which clip over the blocks 1005 
as shown. The top and bottom of the carrier plate 1008 are tack welded to 
end plates 1012 and 1013 which are bolted to the jaw holder 1002 by socket 
screws 1014. The friction layer 1009 comprises a sheet of zircon paper 
which is bonded to the carrier plate 1008. The carrier plate 1008 is made 
of sheet steel and is approximately 1.5 mm thick. As such it is quite 
flexible. 
In use, two or more jaw assemblies are placed in a tong and are disposed 
around a length of casing. The jaw assemblies 1001, 1001' are then 
advanced radially inwardly in the direction of arrows "A" (FIG. 12) until 
they engage and firmly grip the casing. Because of the flexible 
construction of the gripping arrangement 1007, the shims 1006 and the 
arcuate pad 1004, the friction layer 1009 substantially conforms to the 
circumference of the casing and grips the casing with a substantially 
uniform gripping action. Once the casing has been firmly gripped the jaws 
are rotated by the tong in the usual manner. It will be noted that 
circumferential forces applied to the friction layer are transmitted 
through the carrier plate 1008 so that any local loads caused, for example 
by an irregularity in the surface of the casing are redistributed by the 
carrier plate 1008 and transmitted to the jaw holder 1002 via the side 
flange 1011 and the arcuate pad 1004 (see FIG. 18). 
Various modifications to the embodiment described are envisaged, for 
example the friction layer 1009 could comprise silica paper, carborundum 
paper, tungsten carbide paper, or diamond paper, the term "paper" as used 
herein including cloth. If desired the friction layer 1009 may comprise a 
layer of flexible material, for example metal, having a surface formed 
with ridges and valleys similar to the surface of a metal file. Such an 
arrangement is shown in FIG. 15 where the friction layer has been 
identified by reference numeral 1009'. In this embodiment the friction 
layer could be bonded to the carrier plate. However, it is conceivable 
that the carrier plate could be dispensed with since the friction layer 
1009' is capable of redistributing circumferential forces itself. If 
desired the blocks 1005 are disposed with, particularly if the arcuate pad 
1004 is made from a relatively firm resilient elastomeric material. The 
shims 1006 may be dispensed with although they help prevent the resilient 
elastomeric material of the arcuate pad 1004 being extruded under 
pressure. 
FIG. 16 shows another friction layer 1009" which comprises a perforate 
screen the exposed surface of which is coated with grit, preferably zircon 
grit. This arrangement has the advantage that any paint or dirt dislodged 
from the surface of the casing can be accommodated in the perforations of 
the screen. Because of the large number of holes in the perforate screen 
the perforate screen is preferably used in conjunction with a carrier 
plate 1008 to which it is preferably secured either by adhesive or by 
soldering or welding. It has also been found desirable to coat the surface 
of the perforate screen which faces the carrier plate with grit to enhance 
the transfer of forces therebetween. If desired the carrier plate could 
conceivably be dispensed with although this is not recommended. 
FIG. 17 shows another friction layer 1009'" which is formed from expanded 
mesh which has been flattened between two rolls. Both surfaces of the 
expanded mesh have been coated with tungsten carbide grit, one to enhance 
gripping of the casing and the other to enhance gripping of the carrier 
plate 1008. As with the embodiment shown in FIG. 16, the spaces between 
the openings in the mesh can accommodate debris which might otherwise 
inhibit effective gripping of the casing. If desired the outer surface of 
the expanded mesh could be coated with tungsten carbide grit and the inner 
surface brazed or soldered to the carrier plate 1008. 
The shims 1006 may be dispensed with. However, they do help redistribute 
any localized radial loads over the surface of the arcuate pad 1004. For 
extremely light loads the gripping arrangement 1007 may comprise a sheet 
of abrasive paper without a carrier plate 1008, but other embodiments may 
be more durable. 
In use, the gripping arrangement 1007 can be rapidly replaced simply by 
unscrewing the socket screws 1014, removing the end plates 1012 and 1013 
together with the gripping arrangement 1007 and installing a new 
arrangement. Because it is normally essential to minimize replacement time 
the gripping arrangement 1007 will normally be supplied complete with end 
plates 1012 and 1013. The gripping arrangement 1007 may be removably 
mounted on the end plates 1012 and 1013 if desired. 
The present invention is useful for gripping casing for rotation. Gripping 
arrangements in accordance with the present invention may also be used for 
gripping and rotating other tubulars, for example tubing or drill strings, 
or for use in slips, for example for supporting a casing string or drill 
string while lengths are being added thereto or subtracted therefrom. 
Referring to FIGS. 19A and 19B of the drawings there is shown a 
conventional tong assembly which is generally identified by the reference 
numeral 2001. 
The tong assembly 2001 comprises a power tong 2002 and a backup tong 2003. 
The power tong 2002 comprises a pair of gates 2004, 2005 which are held 
together in the position shown by latch 2006. When the latch 2006 is 
released the gates 2004, 2005 can be swung open by admitting hydraulic 
fluid to piston and cylinder assemblies 2007 and 2008. The power tong 2002 
also contains a rotary 2009 which is provided with four jaw assemblies 
2010. The rotary 2009 can be rotated by a hydraulic motor 2011. 
The backup tong 2003 is provided with two gates 2012, 2013 which are held 
together by latch 2014 but which, when latch 2014 is released can be swung 
to an open position. 
In use, a lower length of casing (not shown), the upper end of which is 
provided with a socket, is gripped by slips. A stabbing guide is mounted 
on the socket and the pin of an upper length of casing is lowered into the 
stabbing guide. 
Once the pin is correctly located the stabbing guide is removed. The gates 
2004, 2005 of the power tong 2002 and the gates 2012, 2013 of the backup 
tong 3 are then opened and the tong assembly 2001 moved towards the casing 
until the lower length of casing lies within the backup tong 2003 and the 
upper length of casing lies within the power tong 2002. The gates 2004, 
2005, 2012, 2013 are then closed and latched. Jaw assemblies in the backup 
tong are then advanced to engage the lower length of casing while jaw 
assemblies in the power tong 2002 are advanced to grip the upper length of 
casing. The hydraulic motor 2011 is then actuated to turn the rotary 2009 
and rotate the upper length of casing relative to the lower length of 
casing. The tong assembly 2001 is supported by a pneumatic lifting 
cylinder 2015 which enables the power tong 2002 to move towards the backup 
tong 2003 as the pin enters the socket. Reaction forces are transmitted by 
columns 2016 disposed to either side of the tong assembly 2001 and by a 
series of levers in a known manner. It should be noted that the power tong 
2002 is free to move in a plane parallel to the backup tong 2003 within 
certain limits. 
Referring now to FIGS. 20A and 20B there is shown an apparatus in 
accordance with the present invention which is generally identified by the 
reference numeral 2100. 
The apparatus 2100 comprises a tong assembly 2101 which is generally 
similar to the tong assembly 2001 shown in FIGS. 19A and 19B and parts of 
the tong assembly 2101 similar to the tong assembly 2001 have been 
identified by similar reference numerals in the "2100" series. 
The main differences are that: 
The top of the power tong 2102 is provided with a guide 2117; 
The backup tong 2103 is provided with jaw assemblies for accurately 
positioning the lower casing with respect to the backup tong 2103; and 
Means are provided for accurately aligning the power tong 2102 with respect 
to the backup tong 2103 and hence the guide 2117 with the lower casing. 
Turning first to the guide 2117 it will be seen from FIG. 21B that this 
comprises four identical components 2118 which are bolted to the top of 
the power tong 2102. As best shown in FIG. 21C each component is tapered 
so as to guide the pin of an upper casing to the center of the opening of 
the power tong 2102. 
Referring now to FIG. 22, the backup tong 2103 is provided with three 
prismatic jaw assemblies 2119a, 2119b, and 2119c which, when actuated, 
hold a lower length of casing 2120 in a fixed position relative to the 
backup tong 2103. 
As shown in FIG. 23 the backup tong 2103 is provided with three upwardly 
extending locating rods 2121 which are each provided with a conical tip 
2122. Similar, the underside of the power tong 2102 is provided with three 
blocks 2123 each of which is provided with a recess 2124 shaped to receive 
the conical tip 2122 of a respective locating rod 2121. 
In use, the lower length of casing 2120 is first secured by slips on the 
rig floor in the usual manner. The gates 2112 and 2113 of the backup tong 
2103 are then opened and the tong assembly 2101 moved into position with 
the backup tong 2103 circumjacent the lower length of casing 2120 and 
immediately below the socket 2125 thereof. 
The gates 2112 and 2113 are then closed by hydraulic piston and cylinder 
assemblies 2126 and 2127 and the latch 2114 closed. The prismatic jaw 
assembly 2119a is fixed while prismatic jaw assemblies 2119b and 2119c are 
automatically advanced by a predetermined distance when the latch 2114 is 
closed. This grips the lower length of casing firmly and also ensures that 
the backup tong 2003 is in a fixed position relative to the lower length 
of casing 2120. The position thus far attained is shown in FIG. 23. 
At this time pneumatic lifting cylinder 2115 is extended which lowers the 
backup tong 2003. The conical tips 2122 of the locating rods 2121 enter 
the recesses 2124 of the blocks 2123 and thus locate the power tong 2002 
with respect to the backup tong 2003. This in turn locates the guide 2117 
with respect to the lower length of casing 2120 so that the center of the 
guide 2117 is coaxial with the axis of the lower length of casing 2120. 
This position is shown in FIG. 24. 
At this time the upper length of casing 2128 is lowered into the proximity 
of the guide 2117. As shown in FIG. 25 the lower end of the upper length 
of casing 2128 is provided with a pin 2129 which is tapered. 
As the upper length of casing 2128 is further lowered the pin 2129 enters 
the guide 2117 and is centered thereby. It then passes downwardly until it 
enters the socket 2125 as shown in FIG. 26. 
The power tong 2102 is then raised so that the blocks 2123 are well clear 
of the locating rods 2121. At this point the jaw assemblies in the power 
tong 2102 are applied to the upper length of casing 2128 and the hydraulic 
motor 2111 actuated to rotate the rotary and screw the pin 2129 into the 
socket 2125. During the procedure the power tong 2102 moves towards the 
backup tong 2103. However, even when the joint is tightened to the 
required torque the blocks 2123 still lie a short distance above the 
conical tips 2122 of the locating rods 2121. 
At this stage the jaw assemblies of both the power tong 2102 and the backup 
tong 2103 are relaxed, the gates 2104, 2105, 2112 and 2113 opened and the 
tong assembly 2101 retracted in preparation for the casing being lowered. 
It will be noted that one component 2118 of the guide 2117 is mounted on 
each of the gates 2104, 2105 and accordingly the guide 2117 opens and 
closes with the gates 2104, 2105. 
For certain applications a backup tong is not required, for example where 
the power tong can conveniently be restrained by a chain attached to the 
drilling tower. 
FIG. 28 shows an apparatus in accordance with the present invention which 
is generally identified by the reference numeral 2200. 
The apparatus 2200 comprises a power tong 2202 which is generally similar 
to the power tong 2002. The basic construction of the power tong 2202 is 
similar to the power tong 2002 and parts having similar functions have 
been identified by the same reference numeral in the "2200" series. 
The main differences are that the apparatus 2200 does not include a backup 
tong and that it is provided with a guide 2217 and a socket centralizer 
2230. 
In use, the lower length of casing 2220 is first secured by slips (not 
shown) with the socket 2225 facing upwardly close to the slips. The power 
tong 2202 is then lowered onto the socket 2225 so that the socket 2225 
enters the socket centralizer 2230 and aligns the socket centralizer 2230, 
the socket 2225 and the guide 2217. The upper length of casing 2228 is 
then lowered so that its pin 2229 enters the guide 2217, is center there 
by and enters the socket 2225. At this point power tong 2202 is raised. 
Its jaw assemblies are then advanced to grip the upper length of casing 
2228 which is then rotated to screw the pin 2229 into the socket 2225. 
Once the joint is tightened to the required torque the gates 2204, 2205 
are opened and the power tong 2202 withdrawn. 
The embodiment shown in FIG. 29 is generally similar to that shown in FIG. 
28 except that the apparatus 2300 also includes a backup tong 2303. Since 
the upper length of casing 2328 and the lower length of casing 2320 are 
being aligned by the guide 2317 and the socket centralizer 2330 no special 
arrangements need be made for aligning the power tong 2302 and the backup 
tong 2303. 
The procedure for connecting the upper length of casing 2328 to the lower 
length of casing 2320 is as follows. First, the lower length of casing 
2320 is secured in slip (not shown). The gates 2312, 2313 of the backup 
tong are then opened and the apparatus 2300 maneuvered so that the lower 
length of casing 2320 is disposed within the backup tong 2303. The power 
tong 2302 is then lowered until the socket 2325 on the lower length of 
casing 2320 is received within the socket centralizer 2330. The upper 
length of casing 2328 is then lowered until the pin 2329 passes through 
guide 2317 and enters the socket 2328. Only at this stage are gates 2312, 
2313 closed and the jaw assemblies of the backup tong 2303 activated to 
grip the lower length of casing 2320. The power tong 2302 is then raised 
and its jaw assemblies activated to grip the upper length of casing 2328 
which is then rotated to cause the pin 2329 to enter the socket 2325 and 
the joint to be tightened to the desired torque. The jaw assemblies are 
then relaxed and the gates 2304, 2305, 2312, 2313 of the power tong 2302 
and the backup tong 2303 opened prior to retracting the apparatus 2300. 
Various modifications to the embodiments described are envisaged, for 
example, if desired, the guide and the socket centralizer could be mounted 
on the backup tong 2303 rather than the power tong 2302. Alternatively, 
the guide could be mounted on the backup tong without a socket 
centralizer. Such an arrangement is shown in FIG. 30. 
The embodiment shown in FIG. 30 is generally similar to that shown in FIG. 
19a and 19b and parts of the tong assembly 2401 similar to the tong 
assembly 2001 have been identified by similar reference numerals in the 
"2400" series. One difference is that the top of the backup tong 2403 is 
provided with a guide 2417. 
In use, the lower length of casing 2420 is first secured by stops 2431 on 
the rig floor in the usual manner. The gates 2412 and 2413 of the backup 
tong 2403 are then opened. Since two of the four components 2418 of the 
guide 2417 are mounted on the gates 2412 and 2413 the guide 2417 opens 
with the gates 2412 and 2413 so that the lower length of casing 2420 can 
enter the backup tong 2403 when the carriage 2432 which supports the 
apparatus 2400 is advanced towards the casing 2420 on rails 2433. When the 
lower length of casing 2420 is fully within the backup tong 2403 the gates 
2412 and 2413 are closed. The components 2418 of the guide 2417 have a 
stepped interior (not visible in FIG. 30) so that the lower part of each 
component 2418 touches the socket on the top of the lower length of casing 
2420 whilst the upper part of the interior of each component 2418 tapers 
inwardly to form a funnel. Once the lower length of casing 2420 has been 
gripped the upper length of casing 2428 is lowered through the power tong 
2402 towards the lower length of casing 2420. The guide 2417 guides the 
pin on the bottom of the upper length of casing 2428 into the socket. The 
power tong 2402 is disposed a small distance above the guide 2417. Once 
the pin of the upper length of casing 2428 has entered the socket on the 
lower length of casing the jaws of the power tong 2402 are applied to the 
upper length of casing 2428 which is rotated until the joint reaches the 
desired torque. 
Thereafter, gates 2404, 2405, 2412, 2413 are opened and the assembly 2400 
retracted on the carriage 2432. 
Referring to FIGS. 31 to 37 of the drawings there is shown a rotary which 
is generally identified by the reference numeral 3100. 
The rotary 3100 is fitted with a jaw assembly 3101 which comprises two jaw 
units 3102 which are pivotally mounted on a pivot shaft 3103 and which are 
biased apart by a spring 3104. 
Each jaw unit 3102 comprises a jaw holder 3105 on which is mounted a jaw 
3106 the radially inner surface of which is provided with a plurality of 
gripping elements 3107 which together define a gripping surface which is 
substantially arcuate. 
The jaw holders 3105 are provided with an arcuate track 3108 and the jaw 
3106 is slidably mounted on the arcuate track 3108 so that the jaws 3106 
can slide along the arcuate track 3108 relative to the jaw holder 3105. 
Thus, when the jaw holders 3105 are in the position shown in FIGS. 31 to 37 
the jaws 3106 can slide along an arcuate path having a center of curvature 
at a point 3109 which is radially inwardly of the gripping surface of the 
gripping elements 3107 but to one side of the center 3110 of the rotary 
3100. 
In use, when it is desired to grip a tubular 3111, for example a length of 
casing, the tubular 3111 is introduced into the rotary 3100 through the 
opening 3112. This is shown in FIG. 31. It should be noted that the jaws 
3106 have been displaced to a position where they touch one another at 
point 3113. This position can be achieved by displacing the jaws 3106 
manually. However, in practice the jaws 3106 will normally be found in 
this position as a result of the exit of the previous tubular as will be 
described more fully hereinafter. 
FIG. 32 shows the tubular 3111 entering the jaw assembly 3101, it will be 
noted that part of the arcuate track 3108 is visible. 
FIG. 33 shows the tubular 3111 contacting the jaws 3106. As the tubular 
3111 is further advanced towards the center 3110 of the rotary 3100 the 
jaws 3106 are displaced in the direction of the arrows 3114 until they 
come to rest in the position shown in FIG. 34. It will be noted that the 
arcuate track 3108 is no longer visible. 
The rotary 3100 is then rotated clockwise (as viewed in FIG. 34) to advance 
the jaws 3106 into gripping engagement with the tubular 3111 as will be 
described herein after. The gripping surface substantially conforms to the 
surface of the tubular 3111 and thus has a center of curvature at the 
center 3110 of the rotary 3100 when the jaws 3106 are applied. After the 
tubular 3111 has been rotated and tightened to the required torque the 
rotary 3100 is rotated anti-clockwise to allow the jaws 3106 to move away 
from the tubular 3111 under the influence of spring 3104. 
The tubular 3111 is then moved towards the opening 3112. As it moves it 
engages the jaws 3106 and displaces them in the direction of the arrows 
3115 so that they occupy the position shown in FIG. 36 which is identical 
to FIGS. 31, 32 and 37. 
FIG. 37 shows the tubular 3111 leaving the rotary 3100. 
It will be appreciated that the jaw assembly 3101 is extremely simple, 
quick to use and relatively inexpensive to manufacture and maintain. 
Referring now to FIG. 38, the rotary 3100 is shown fitted in a tong 3116. 
As shown in FIG. 39 and 40, the rotary 3100 is formed as a one piece 
casting which comprises a top section 3117, a bottom section 3118, and a 
peripheral wall 3119 on which is formed a toothed track 3120. Both the top 
section 3117 and the bottom section 3118 are provided with an elongate 
slot 3121, 3122 respectively. Each elongate slot 3121, 3122 has its center 
of curvature on the center of rotation of the rotary 3100. 
As can be seen from FIG. 38, the upper part of the pivot shaft 3103 which 
forms the pivot point for the two jaw units 3102 projects upwardly through 
the elongate slot 3121 while the lower part of the pivot shaft 3103 
projects downwardly through the elongate slot 3122. 
The upper part of the pivot shaft 3103 is secured to a disk 3123 which is 
provided with a handle 3124. 
A friction member 3125 extends circumjacent the disk 3123 and is held 
thereagainst by a tensioner 3126. 
A disk 3127 similar to disk 3123 is mounted below the rotary 3100 and is 
also engaged by a second friction member similar to friction member 3125. 
As can be seen in FIG. 38 and FIGS. 31 to 37, the sides of the rotary 3100 
are provided with cams 3128, 3129, 3130 and 3131 which are screwed to the 
rotary 3100. The rotary 3100 is located in the tong 3116 by nine guide 
rolls 3132, five of which are visible in FIG. 38. The guide rolls 3132 
each have an upper and a lower roller which bears against the peripheral 
wall 3119 of the rotary 3100 above and below the toothed track 3120 
respectively. 
The rotary 3100 is driven by a hydraulic motor (not shown) which acts 
through a gear train which includes gear wheels 3133, 3134 and 3135. 
In FIG. 38 the tubular 3111 is about to be gripped. (This corresponds to 
the position shown in FIG. 34.) The hydraulic motor (not shown) is 
actuated to rotate gear wheels 3133, 3134 and 3135 which in turn rotate 
the rotary 3100 in a clockwise direction. However, while the rotary 3100 
rotates the disk 3123 is restrained by the friction member 3125. The disk 
3123 in turn restrains the pivot shaft 3103 and the jaw assembly 3101. 
Because the jaw assembly 3101 is restrained the jaw units 3102 ride up on 
the cams 3128, 3130 which urge the jaws 3106 into the tubular 3111 until 
either the pivot shaft 3103 engages the end of the elongate slot 3121 (or 
the forces between the tubular 3111, the jaw units 3102 and the cams 3128, 
3130 are sufficiently high) at which time the disk 3123 rotates in unison 
with the rotary 3100 against the friction member 3125. It will be noted 
that because the centers of curvature of the gripping elements 3107 and 
the arcuate track 3108 do not coincide the jaw holders 3105 do not spin 
around the jaws 3106 although means to limit the sliding movement of the 
jaws 3102 relative to their jaw holders 3105 could be provided if desired. 
When the tubular 3111 has been tightened to the desired torque the 
hydraulic motor is reversed to rotate the rotary 3100 anti-clockwise. The 
jaws 3106 are normally firmly engaged in the tubular 3111 and hence the 
rotary 3100 rotates relative to the jaw assembly 3101 so that the jaw 
holder 3105 returns to the position shown in FIG. 38. Means may be 
provided to prevent the jaw holders 3105 engaging the cams 3129 and 3131. 
It will be noted that the jaw holders 3105 are each provided with a roller 
3136 which engages the cams 3128, 3129, 3130 and 3131. 
If it is desired to rotate the tubular 3111 in the opposite direction then 
the rotary 3100 is simply rotated in the opposite direction causing the 
rollers 3136 to roll along the cams 3129, 3131. 
It will be noted that the entire jaw assembly 3101 can be removed from the 
rotary 3100 by simply removing the pivot shaft 3103 and withdrawing the 
jaw units 3102. The cams 3128, 3129, 3130, 3131 can then be readily 
replaced if desired and the jaw units 3102 refitted or replaced if 
desired. Such changes would generally be made when changing the diameter 
of the tubular being run. 
In conclusion, therefore, it is seen that the present invention and the 
embodiments disclosed herein and those covered by the appended claims are 
well adapted to carry out the objectives and obtain the ends set forth. 
Certain changes can be made in the subject matter without departing from 
the spirit and the scope of this invention. It is realized that changes 
are possible within the scope of this invention and it is further intended 
that each element or step recited in any of the following claims is to be 
understood as referring to all equivalent elements or steps. The following 
claims are intended to cover the invention as broadly as legally possible 
in whatever form it may be utilized. The invention claimed herein is new 
and novel in accordance with 35 U.S.C. .sctn. 102 and satisfies the 
conditions for patentability in .sctn. 102. The invention claimed herein 
is not obvious in accordance with 35 U.S.C. .sctn. 103 and satisfies the 
conditions for patentability in .sctn. 103. This specification and the 
claims that follow are in accordance with all of the requirements of 35 
U.S.C. .sctn. 112.