U.S. patent number 3,552,506 [Application Number 04/757,950] was granted by the patent office on 1971-01-05 for drill rod uncoupling and storage apparatus.
This patent grant is currently assigned to Gardner-Denver Company. Invention is credited to James R. Mayer.
United States Patent |
3,552,506 |
Mayer |
January 5, 1971 |
DRILL ROD UNCOUPLING AND STORAGE APPARATUS
Abstract
An uncoupling and storage apparatus for multiple sections of
extension drill rods having spaced rack members for storing drill
rod sections laterally in line with the drill string and
interconnected to transfer extension drill rods seriatim to and
from the drill string. Spaced substantially arcuate openings in one
of the rack members provide jaw surfaces for cooperatively forming
with a sliding member a clamp mechanism for nonrotatively clamping
a drill rod section for uncoupling from the drill string. The
sliding member of the clamp mechanism has predetermined spaced
recesses providing complementary jaw surfaces for clamping only the
drill rod section which is successively in position to be uncoupled
from the drill string.
Inventors: |
Mayer; James R. (Dallas,
TX) |
Assignee: |
Gardner-Denver Company (Quincy,
IL)
|
Family
ID: |
25049855 |
Appl.
No.: |
04/757,950 |
Filed: |
September 6, 1968 |
Current U.S.
Class: |
175/85; 173/164;
81/57.21; 414/22.63 |
Current CPC
Class: |
E21B
19/20 (20130101); E21B 7/02 (20130101); E21B
19/14 (20130101) |
Current International
Class: |
E21B
19/20 (20060101); E21B 7/02 (20060101); E21B
19/00 (20060101); E21B 19/14 (20060101); E21b
019/14 () |
Field of
Search: |
;175/52,85 ;166/77.5
;81/57.16,57.21,57.34,(Inquired) ;214/2.5 ;24/81CC,263RC,(Inquired)
;211/6S,(Inquired) ;254/29--31,(Inquired) ;269/234(Inquired)
;173/164 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Calvert; Ian A.
Claims
I claim:
1. In a drill rig, in combination:
an elongated support;
a drill motor mounted on said support for longitudinal movement
therealong; and
a plurality of extension drill rod members for making up an
extension drill string; said drill string being connectable at one
end thereof to said drill motor to be driven longitudinally with
respect to said support; and the improvement comprising: drill rod
handling and storage means comprising spaced storage rack members
independently mounted on said support and movable laterally
relative thereto; said rack members including retaining means for
retaining, respectively therebetween, opposite ends of a plurality
of drill rods, whereby said drill rods are stored laterally
seriatim with respect to the axis of said drill string, and rotary
drive means for moving said spaced rack members, in unison, into
and out of line with said drill string for adding or removing drill
rod sections with respect thereto.
2. In a drill rig:
a. means for rotating a drill string made up of a plurality of
coupled rods;
b. apparatus operable for holding said rods successively against
rotation as each of said rods is uncoupled from said drill string,
said holding apparatus comprising:
1. a member having openings comprising a series of jaw surfaces for
receiving said rods laterally with respect to the rotational axis
of said drill string and for receiving said rods seriatim as they
are successively uncoupled from said drill string; and
2. clamping means comprising a member slidably disposed adjacent
said drill rod receiving member and having recess means comprising
a series of jaw surfaces complementary to and coactable
respectively with said series of jaw surfaces on said receiving
member, and in response to the operation of said clamping member
any one of said drill rods received in any one of said openings
will be nonrotatively clamped with respect to said receiving member
when said one drill rod is successively in position to be uncoupled
from said drill string.
3. The invention according to claim 2 wherein: said jaw surfaces on
said receiving member substantially surround said drill rods when
said drill rods are retained thereby, and said complementary jaw
surfaces on said clamping member are operable, in response to the
operation of said clamping member to clamp said one drill rod
section and the operation of said rotation means to tend to rotate
said one drill rod section, to nonrotatably clamp said one drill
rod section increasingly tighter.
4. The invention according to claim 2 wherein: each jaw surface on
said clamping member is spaced progressively further apart from its
respective coacting jaw surface on said receiving member when the
jaw surfaces of an endmost pair of complementary jaw surfaces in
said series are positioned coincident with each other.
5. The invention according to claim 4 wherein: said complementary
jaw surfaces on said clamping member and said receiving member are
substantially arcuate having a predetermined radius of curvature
and the center of each said radius for each jaw surface on said
clamping member is located progressively further apart from the
radius center of each respective coacting jaw surface on said
receiving member when the radius centers of an endmost pair of jaw
surfaces in said series are positioned coincident with each
other.
6. In a drill rig, in combination:
an elongated support;
a drill motor mounted on said support for longitudinal movement
therealong; and
a plurality of extension drill rod members for making up a
rotatable extension drill string; said drill string being
connectable at one end thereof to said drill motor to be driven
longitudinally with respect to said support; and the improvement
comprising: drill rod handling and storage means comprising spaced
so storage rack members independently mounted on said support and
movable laterally with respect to said support; said rack members
including retaining means for retaining, respectively therebetween,
opposite ends of a plurality of drill rods, and drive means
interconnecting said spaced rack members comprising an elongated
shaft rotatively mounted on said support and operable to be driven
by rotary motor means, said drive shaft including gear means
adjacent said respective storage rack members and engaged with
complementary gear rack means on said storage rack members whereby
in response to actuation of said rotary motor said storage rack
members are movably positioned, in unison, laterally with respect
to the rotational axis of said drill string for adding or removing
extension drill rod members.
7. In a drill rig:
a. means for rotating a drill string made up of a plurality of
coupled rods;
b. apparatus for uncoupling and storing said plurality or of rods,
said apparatus comprising:
1. a member having a plurality of openings for receiving a
plurality of said rods laterally with respect to the rotational
axis of said drill string and for receiving said rods seriatim as
they are uncoupled from said drill string; and
2. means movable with respect to said receiving member and
cooperable therewith to clamp any one of said plurality of rods
received in said receiving member and to hold only said one rod
against rotation when said one rod is in position to be uncoupled
from said drill string.
8. The invention set forth in claim 7 wherein: said clamping means
comprises a member slidably disposed adjacent said drill rod
receiving member and having recess means complementary to said
openings in said receiving member.
Description
BACKGROUND OF THE INVENTION
In drilling rigs of the type used for drilling holes in the earth
of substantial depth, it is accordingly necessary to provide a
drill string of substantial length which for practical purposes
comprises a number of extension drill rod or pipe members
threadedly coupled end to end. The necessity for providing multiple
extensions drill rods to make up a drill string has in turn brought
about requirements for rig mounted mechanized drill rod storage and
handling apparatus. A number of such devices are disclosed in the
prior art including types which retain multiple drill rods
laterally in line with the drill string and types which comprise a
revolving magazine having spaced receiving means for retaining
individual rod sections. A common shortcoming of known apparatus
however is mechanical complexity which in most cases in spite of
adequate operational characteristics results in high maintenance
costs and contributes to reduced rig availability for actual
drilling operations due to problems in reliability.
A related problem long associated with the operation of extension
drill strings has been one of uncoupling one drill rod from another
when removing the drill string from the drill hole for such
operations as changing drill bits or upon completing the desired
hole depth. Various uncoupling means sometimes known as breakout
wrenches have been developed in the prior art for clamping or
locking one drill rod section relative to another for unscrewing
the threaded joint therebetween. Drill rod threaded joints are
often very tight due to the continuous impact and torsional loading
during drilling operations and, accordingly, substantially
complicated breakout devices are often required to uncouple
extension drill rod members. Drill rod uncoupling means are usually
associated with the aforementioned storage and handling apparatus
and devices known in the art are often provided for each individual
drill rod retaining and storage position resulting in a substantial
complication and multiplication of mechanism on the drilling
rig.
SUMMARY OF THE INVENTION
The present invention provides for an improved storage and
uncoupling apparatus for multiple extension drill rod sections
which includes spaced retaining members of quite simplified
construction for storing extension drill rods laterally in line
with a drill feed. The invention also provides simplified means for
moving multiple drill rods in line over the drill hole for
insertion and removal from a drill string by providing spaced
storage rack members synchronized to move in unison.
A particularly advantageous aspect of the invention is the
provision of a simplified drill rod uncoupling device which
includes a single movable member cooperable with one of the drill
rod retaining members to form a clamping mechanism for nonrotatably
clamping an extension drill rod section to permit unscrewing the
threaded joint between a clamped drill rod section and another or
between a clamped drill rod section and a drill motor.
An advantage of the present invention also resides in the
construction of the cooperative movable clamping member and the
drill rod retaining member to provide for nonrotatably clamping
only the drill rod section which is successively in position to be
removed from the drill string.
A further advantage of the present invention resides in the
provision of an improved drill rod uncoupling device which is
self-energizing for nonrotatably clamping an extension drill rod
increasingly tighter as greater rotatory effort is applied in
unscrewing threaded joints or the like. These and other advantages
of the present invention will be more thoroughly understood upon
reading the detailed description of a preferred embodiment of the
invention.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a front elevation of a typical crawler mounted rock
drilling rig and illustrates a preferred arrangement of drill rod
uncoupling and storage apparatus mounted thereon.
FIG. 2 is a view from the line 2-2 of FIG. 1 illustrating details
of construction of the drill rod uncoupling clamp mechanism in the
process of uncoupling an extension drill rod section.
FIG. 3 is a view substantially from the line 3-3 of FIG. 1
illustrating details of the upper storage rack member.
FIG. 4 is a plan view of the retaining member and the clamp member
of the drill rod uncoupling apparatus with pertinent dimensions
indicated to illustrate the predetermined spacing of the
complementary jaw surfaces.
FIG. 5 is a fragmentary view similar to FIG. 2 and showing a second
drill rod section being clamped for uncoupling from a drill
string.
FIG. 6 is a fragmentray view similar to FIGS. 2 and 5 and showing a
third drill rod section being successively clamped for uncoupling
from a drill string.
FIG. 7 is a view partly sectioned, taken substantially along the
line 7-7 of FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to FIG. 1, a typical crawler mounted portable rock
drilling rig, generally designated by the numeral 10, is
illustrated in a vertical drilling position. The drill rig 10
comprises a crawler-type undercarriage 12 adapted to adjustably
mount an elongated mast or guide shell 14. The mast 14 is
constructed, basically, of two inwardly turned channel members 16
and 18 which provide for slidably mounting a pressure fluid
operated drill motor 20. The drill motor 20 is of a well-known
percussion type and includes a short section of drill steel in the
form of a threaded shank portion 22 retained and extending from the
lower end thereof. The shank portion 22 is adapted to transmit
percussion blow energy and rotational motion provided by the drill
motor 20 to a string of extension drill steel in a manner well
understood by those of ordinary skill in the art. The drill motor
20 receives pressure fluid from a source, not shown, via a main
supply line 24, a bank of control valves 26 and a plurality of
flexible conduits 28, 30 and 32 for providing, respectively,
percussion and rotational energy, and hole cleansing medium. The
drill motor 20 may be slidably fed back and forth along the mast 14
by a feed mechanism, not shown, of one of a number of types well
known in the art of drilling apparatus to provide for feeding an
extension drill string 34 in and out of the drill hole 36.
In the condition illustrated in FIG. 1 an extension drill rod 38
having a coupling 39 is in the process of being uncoupled from the
drill string 34 including a section of drill rod 40 and coupling
42, and from the shank 22. Uncoupling and handling of the extension
drill rod 38 and additional extension drill rod members of the
drill string 34 is accomplished by apparatus comprising upper and
lower storage rack members 44 and 46, respectively. The lower rack
member 46 comprises a substantially T-shaped element having a
vertical rail section 48 and a portion 50 perpendicular thereto for
supporting a plurality of cuplike receptacles 52 for receiving the
threaded ends of extension drill rods such as the drill rod 38 in
FIG. 1. The lower storage rack 46 is movably supported by four
grooved rollers 54 which in turn are rotatively mounted on a
bracket 56 attached to the mast 14.
Referring to FIGS. 1, 2 and 3 the upper storage rack member 44 is
also of somewhat T-shaped construction including a rail portion 58
movably supported also by grooved rollers 54 mounted on a bracket
60 also fastened to the mast 14. The rack member 44 includes a
drill steel retaining member 62, FIG. 2, having a plurality of
substantially arcuate openings 64, 66 and 68 interconnected by an
elongated slot 69. The slot 69 is predetermined to be of sufficient
width for receiving drill rods and the openings 64, 66, and 68 are
of predetermined diameter to be slightly larger than the coupling
diameter. The upper and lower rack members 44 and 46 are
interconnected by an elongated drive shaft 70 FIGS. 1 and 3) having
spur gear members mounted near each end thereof. FIG. 3 illustrates
the gear 72 engaged with a gear rack 74 mounted on the upper
storage rack member 44. Referring to FIG. 7, the lower storage rack
member 46 includes a gear rack 75 attached to the rail portion 48
and engaged by a spur gear 77 mounted on the lower end of the drive
shaft 70. A bearing 79 supported by the bracket 56 rotatively
journals the drive shaft 70 adjacent the lower end thereof, and an
intermediate bearing 81 and a bearing 83 on the bracket 60, FIG. 1,
also serve to hold the drive shaft in proper alignment.
The drive shaft 70 is rotatively driven by a reversible fluid
operated motor 76 mounted on the bracket 60 and drivably cone
connected to the shaft 70 by means of a coupling 78. Fluid
conductors 80 and 82 provide motive fluid to the motor 76 via a
suitable control, not shown. The spaced storage rack members 44 and
46 are thereby interconnected to move laterally in unison into and
out of position in line with the drill string 34 for removing and
adding, successively, extension drill rod sections. The simplicity
of construction of the rack members 44 and 46 and the simple but
effective motor and drive shaft arrangement for synchronizing the
movement of the rack members 44 and 46 to position the drill rod
storage apparatus makes possible the use of such apparatus even on
relatively lightweight drilling rigs such as the rig 10 shown in
FIG. 1.
Referring to FIG. 2, the rail portion 58 of the upper rack member
44 slidably retains a movable clamp member 84 by means of shoulder
type screws 86 located in the counterbored slots 88. The clamp
member 84 is retained adjacent the retaining member 62 and includes
a plurality of arcuate recesses comprising jaw surfaces 90, 92 and
94 which are complementary to the jaw surfaces formed by the
arcuate openings 64, 66, and 68 on the retaining member 62.
Actuation of the clamping member 84 to nonrotatably engage the
drill rod coupling 39 as shown in FIG. 2 is provided by a double
acting linear fluid motor 96 mounted on the upper rack member 44 by
means of the bracket 97 and connected to the clamp member 84 by
means of the clevis 98. Pressure fluid is supplied to the linear
motor 96 by means of the conductors 100 and 102 via a suitable
control, not shown.
The present invention provides for a lateral in line drill rod
storage apparatus which comprises a retaining member and a movable
clamp member operable to nonrotatably clamp only the drill rod
section which is successively in position to be uncoupled from a
drill string. This feature is provided by the retaining member 62
and the movable clamp member 84 which have a series of respective
coacting jaw surfaces thereon spaced a predetermined distance in
such a manner that only one extension drill rod is nonrotatably
engaged thereby assuring that the force applied by the linear motor
96 is used to clamp only the drill rod section normally required to
be uncoupled. Referring to FIG. 4, the clamp member 84 is shown
positioned so that the center 106 defining the radius center for
the radius R.sub.1 of the complementary jaw surface 90 comprises
also the center of the radius R.sub.2 for the arcuate opening 64 in
the retaining member 62. However, the center 108 for the radius
R.sub.1 defining the jaw surface 92 is spaced the distance X from
the center 110 of the radius R.sub.2 of the second arcuate opening
66 on the retaining member 62, and the center 112 for the radius Rd
1 defining the third complementary jaw surface 94 is spaced the
distance Y from the center 114 for the radius R.sub.2 of the third
arcuate opening 68 on the retaining member 62.
As may be seen in FIG. 4 the spacing of the centers 112 and 114 as
defined by dimension Y is greater than the spacing of the center
108 and 110 as defined by the dimension X. A means of determining
the spacing of the respective jaw surface radius centers for each
respective pair of coacting jaw surfaces would comprise
constructing a common center 106 for the outermost, or furthest to
the right in FIG. 4, radii defining the surfaces 64 and 90 on the
retaining member and clamp member, respectively. The center spacing
of the centers 108 and 112 could then be laid out along a straight
or curved line equidistantly from one another starting from the
reference point 106. Then the centers 110 and 114 could be laid out
along the same straight or curved line also equidistantly from one
another from the reference point 106 but on a center distance
greater than the dimension chosen for the centers 108 and 112. The
result is that pairs of coacting jaw surfaces are progressively
further apart when the reference points are coincident. The effect
that this predetermined spacing of the jaw surfaces has on achieve
achieving the clamping of only the extension drill rod section
successively in position to be uncoupled from the drill string may
be appreciated by viewing FIGS. 2, 5, and 6 in succession.
In FIG. 2 the coupling 39 of the drill rod section 38, first to be
removed from the drill string 34, is shown nonrotatably engaged by
the coacting jaw surfaces 68 and 94 in response to actuation of the
clamping member 84 by the linear motor 96. Obviously, since no
other drill rod member is in the retaining member 62 the clamp
member 84 will slide toward the linear motor 96 until such
engagement occurs. However, in FIG. 5 a second drill rod member 40
having a coupling 42 has been engaged by the coacting jaw surfaces
66 and 92 and being in position to be removed from the drill
string, it is desirable that all clamping effort be concentrated to
nonrotatably clamp the coupling 42 for unscrewing the threaded
joint with the shank 22. It will be noted that the jaw surfaces 94
and 68 are not in engagement with the coupling 39 due to the
previously mentioned predetermined spacing of the surfaces 94 and
92. In like manner, when a third drill rod member having a coupling
portion 116, FIG. 6, is to be removed from the drill string the jaw
surfaces 64 and 90 hold only the coupling 116 in nonrotative
engagement for performing the uncoupling operation due to the
spacing of the surfaces 92 and 90.
A particularly advantageous feature of the present invention is the
self-energizing character of the clamping member 84 when the
threaded joint of a coupling is being unscrewed. In FIG. 2 the
arrow indicates the direction in which the drill motor rotation
means tends to rotate the coupling 39 of the drill rod section 38
during the uncoupling operation. Such tendency to rotate will tend
also to cause the clamping member 84, engaged with the coupling 39
by the jaw surface 94, to move further toward the linear motor 96.
This action will clamp the coupling 39 even tighter between the jaw
surfaces 68 on the retaining member 62 and the complementary jaw
surface 94 on he the clamping member 84. Rotation of the drill rod
section 38 is thereby prevented even when the threaded joints are
particularly tight.
In a typical operating sequence, referring to FIG. 1, during normal
drilling operation the storage rack members 44 and 46 would be
retracted laterally clear of the drill string 34 and the drill
motor 20. Upon completion of a drill hole or for changing a drill
bit, successive removal of drill rod sections would be accomplished
by retracting the drill motor 20 up the mast 14 until the coupling
42 was above the pivoted jaw type drill rod centralizer 118 or a
similar device suitable for supporting the drill string 34 to
prevent the latter from slipping back into the drill hole 36.
Suitable manual or power operated means, not shown, would be used
to uncouple the joint of the rod section 38 with the coupling 42
after which the drill motor 20 and rod section would be raised
until the lower end of the rod section 38 was above the lower rack
member 46 and coincidently the slot 69 on the upper retaining
member 62 would be in line to laterally move around the rod section
38 immediately below the coupling 39. Upon actuation of the fluid
motor 76 the drill rod handling apparatus would be moved in line
over the drill string and the rod section 38 would be lowered into
the receptacle 52 directly below the opening formed by the jaw
surfaces 68 and whereby also the jaw surfaces 68 on the retaining
member 62 would substantially circumsurround the coupling 39. The
linear motor 96 would then be actuated to move the clamp member 84
into nonrotative engagement with the coupling 39 by clamping the
same between the jaw surfaces 68 and 94, FIG. 2. After rotation of
the shank 22 to unscrew the threaded joint with mechanism coupling
39, the drill rod handling apparatus, having uncoupled and stored a
rod section, would be moved laterally out of line with the drill
string and the linear motor 96 would be reversely actuated to
employed the clamp member 84 to the position of FIG. 4. the drill
motor 20 would be fed down the mast 14 to connect the shank 22 to
the next in line to be removed section of drill rod, whereupon
successive sections of drill rod could be uncoupled and stored by
repeating substantially the above-described operating sequence.
In the process of adding extension drill rod members to the drill
string 34 for deepening the drill hole, the clamping mechanism
would not normally be required as the direction of rotation of the
drill shank 22 is reversed to screw the threaded connections
together. However, the invention contemplates that the clamping
mechanism suitably mounted could be employed advantageously at the
lower end of the mast 14 to nonrotatably clamp a coupling and rod
section to disconnect the shank from a drill rod section
preparatory to adding another drill rod section to the drill
string.
As can be readily appreciated by one skilled in the art the present
invention could be modified to accommodate numerous types of
extension drill rods or drill pipe and the number of extension
drill rod sections that could be clamped and stored are limited
only by practical considerations in the design of the drill rig and
in the mechanism for actuating the clamping member. Furthermore,
the geometry of the coacting jaw surfaces need not be substantially
arcuate, as the preferred embodiment discloses, in order to
practice the invention. Although the embodiment illustrated
utilizes the clamping mechanism to uncouple rod sections from a
drill motor shank the invention could be employed to uncouple one
rod section from another as well.
* * * * *