Class / Patent application number | Description | Number of patent applications / Date published |
175052000 | WITH MAGAZINE FOR SUCCESSIVELY MOVING UNCONNECTED, ORIENTED TOOL OR SHAFT SECTIONS TO USE POSITION | 42 |
20080202812 | Simultaneous tubular handling system - A system and method for building and handling oilfield tubular stands while drilling operations are simultaneously and independently occurring with one drilling deck, one derrick, and one rotary system. An offline guided path horizontal to vertical arm lifts and moves in the same plane tubulars stored horizontally on the catwalk and positions the tubulars vertically directly into a preparation hole for assembling and disassembling tubular stands while online drilling operations are simultaneously being conducted. A stand arm lifts and lowers the tubulars into and out of the adjustable preparation hole, and transports the tubulars for storage to an auxiliary tubular racking station in the upper part of the derrick. A bridge racker crane moves tubular stands from the auxiliary tubular racking station to the top drive or another tubular racking station. | 08-28-2008 |
20080202813 | Mouse hole support unit with rotatable or stationary operation - The present invention provides improved methods and apparatus for supporting and engaging drill pipe in a mouse hole that allows for multiple drill pipe sections to be attached together before being attached to an existing drill string. The present invention is designed to allow for engagement and disengagement of drill pipe sections of various diameters without the need for manually inserting or removing support shims or slips. Embodiments of the invention provide for rotation of the engaged drill pipe sections to assist in connection to another drill pipe section. These features allow for speedy set up and attachment of drill pipe sections during drilling operations. The support unit of the present invention is also portable, and may be retrofitted into an existing drill rig platform. | 08-28-2008 |
20080236892 | METHOD OF MULTISTAGE MANUFACTURING A GROUND BORE - In a method for multistage manufacture of a borehole between two earth shafts, a drilling device drills in a first direction a pilot bore between a starting shaft and an end shaft and lines the pilot bore with pipes. Subsequently, the pilot bore is expanded in a second direction opposite to the first direction to form an expansion bore which is simultaneously lined with pipes, while accumulating soil is transported into the end shaft in opposition to the second direction with the aid of a screw conveyor. | 10-02-2008 |
20080296065 | Drill Floor Device - A drill floor device has two or more mouseholes for assembly and disassembly of pipe string sections. The mouseholes are arranged to be displaced underneath the drill floor by a drive system and positioned under a hole or an opening in the drill floor. At least one of the mouseholes is provided with an elevator arranged to raise and lower a pipe or a pipe string section located in the mousehole, between an upper working position in which the upper end of the pipe/pipe string section projects above the drill floor and a lower position of rest in which the upper end of the pipe/pipe string section is below the drill floor. | 12-04-2008 |
20090014215 | Apparatus and method of loading a rod box for a horizontal directional drill - A biased door member is provided in an external wall of a drill rod supply magazine mounted on a horizontal directional drilling (HDD) machine. The door member swings inwardly from a first position parallel to the external wall to a second position within the distal column. At least one cut-out is formed in the external wall at the bottom of the retaining guides located at the longitudinal ends of the magazine. The cut-out creates a window through which the added drill rod is inserted. In operation, a drill rod is moved through the biased door member and window cut-outs into the distal column. The pocket of a rod transfer mechanism is positioned below the last column, and a rod lifter lowers the added drill rod into the pocket. The rod transfer mechanism then moves the added drill rod into alignment with the drill string. | 01-15-2009 |
20090044982 | Top drives with shaft multi-seal - A top drive system for wellbore operations, the top drive system including motor apparatus, a main shaft driven by the motor apparatus, the main shaft having a top end and a bottom end, a quill connected to the main shaft, a gear system interconnected with the quill and the motor apparatus, and a multi-seal system for sealing against the quill. This abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure and is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims, 37 C.F.R. 1.72(b). | 02-19-2009 |
20090107726 | Drilling Assemblies and Methods of Drilling - Drilling assemblies and methods of drilling are disclosed. In one implementation, a drilling assembly includes a rotary drive apparatus configured to rotate a string of drill pipe having a cutting head at a drilling end thereof. A longitudinally elongated torque transfer tube apparatus is mounted to and extends downwardly from the rotary drive apparatus and is configured to longitudinally receive the string of drill pipe rotatably there-through. The torque transfer tube apparatus is isolated from rotation relative to the rotary drive apparatus and the string of drill pipe during drilling with the drilling assembly. A torque receiving structure is provided, and through which the torque transfer tube apparatus is upwardly and downwardly slidably received. The torque transfer tube apparatus and the torque receiving structure are isolated from rotation relative one another and the string of drill pipe during drilling with the drilling assembly. | 04-30-2009 |
20090114446 | Well drilling machine with new drill pipe loader - The invention is a new well drilling machine, in particular for drilling with single pipes, with supporting mast (M) provided with at least one drill head′ (R) for the rotation-translation movement of the drill pipe (A), a loader (C) for said pipes (A), hinged to the relative supporting frame (T), integral with the machine body, and wherein said loader (C) can be slanted from the non-operating position ( | 05-07-2009 |
20100108388 | Apparatus and system and method for down the hole carousel drilling - Apparatus for carousel drilling, which includes a drill tower having a rotatable drive motor at the top, and a carousel pivotably attached with respect to the drill tower and capable of supporting four elongated drilling devices, at least certain of which are drill extenders capable of attachment to, and detachment from, a drilling tool, such as a tricone drill tool for drilling soft earth materials, and a hammer drill tool for drilling hard earth materials. A retainer plate having four cutout openings is located at the upper end portion of the carousel to receive and retain the drilling devices in a generally vertical orientation when the drill tower and the carousel are raised to a generally vertical orientation for operative drilling. A primary breaker plate having four cutout openings is provided for individually receiving and engaging each drilling device at the lower end portion of the carousel, two of the openings configured to prevent rotation of two of the drilling devices for purposes of threaded attachment to, or detachment from, other such drilling devices. A secondary breaker plate is located above the primary breaker plate and has four cutout openings for individually receiving the four drilling devices, at least two of the cutout openings being configured to prevent rotation of the remaining two drilling devices. A method for downhole carousel drilling is also disclosed. | 05-06-2010 |
20100155140 | PIPE RUNNING TOOL HAVING A PRIMARY LOAD PATH - A system for coupling a pipe segment to a pipe string is provided that includes a top drive assembly having a threaded output shaft; and a pipe running tool threadingly coupled to the threaded output shaft of the top drive assembly such that the primary load of the pipe running tool is supported by the threads of the output shaft of the top drive assembly, and wherein the pipe running tool is rotatable by the output shaft and further includes a pipe engaging portion for grippingly engaging the pipe segment sufficient to transmit a torque from the top drive output shaft to the pipe segment. | 06-24-2010 |
20100200297 | Drilling machine with carousel-type drill stem and shroud tube loader - The drilling machine, particularly for use in non-rocky terrain, comprising a machine body with a mast (M) equipped with one or more rotary operating heads (R | 08-12-2010 |
20100230166 | DERRICKLESS TUBULAR SERVICING SYSTEM AND METHOD - A derrickless system for servicing tubulars at a wellhead has a first tubular handling apparatus with a gripper positioned adjacent the wellhead where the gripper grips a surface of one of the tubulars, a second tubular handling apparatus with a gripper positioned adjacent the wellhead where the gripper grips a surface of another of the tubulars, and a slip assembly positioned in the wellhead. The slip assembly has a wedge bowl positioned at the wellhead that is suitable for receiving the tubular therein, and wedges positioned in the wedge bowl that are suitable for positioning between the wedge bowl and the tubular. Each of the grippers of the first and second tubular handling apparatus has a stab frame and three grippers attached to the stab frame. | 09-16-2010 |
20100307826 | ROD CHANGER FOR A ROCK DRILL - A rock drill system includes a rotatable carousal adapted to hold a plurality of drill rods. A carousal driver is in communication with the rotatable carousal. The carousal driver includes a driver gear and a driven gear. Both the driver gear and the driven gear are coated with a self-lubricating/anti-corrosive layer comprising a metal-containing composition and a fluorine-containing resin. The rock drill system also includes a rod gripper for positioning a drill rod under a rock drill. Another rock drill system of similar design is provided in which the rod gripper includes one or more pivot pins that are coated with a self-lubricating/anti-corrosive layer comprising a metal-containing composition and a fluorine-containing resin. | 12-09-2010 |
20100307827 | METHOD AND DEVICES FOR HANDLING ROD-LIKE PIECES IN DRILLING AND BOLTING - A method and a rod magazine for handling elongated rods in a rock drilling unit, and a bolting unit. Elongated rods, such as drill rods and rock bolts, are stored into a linear rod magazine—provided with feed members for transferring the rods upward and downward in the magazine. The feed members comprise screw surfaces by which the rods are supported in the magazine. The required feeding movement is produced by rotating the feed members about their rotation axis. In addition, the rod magazine comprises transfer means that allow the rods to be transferred from the magazine to a drilling line or bolting line, i.e. to a centre, and vice versa. The transfer means are provided with gripping means for gripping the rods. | 12-09-2010 |
20110114386 | Split Sub-basement Drill Rig - A sub-basement assembly for transportable, mobile drill rigs for supporting the drill rig floor has a low ‘stack’ height for transit but due to the configuration of its linkages, but may be quickly and easily raised as the drill rig is erected. The height & size of the present invention's ‘floor’ is very compact in shipment, yet provides for the full load carrying capacity and full size of conventional ‘floors’ during drilling operations. | 05-19-2011 |
20110214917 | Power Swivel Stand Having Pivoting Positioning Arms - A power swivel stand for horizontally and vertically positioning a power swivel with respect to a well being serviced. A frame is mounted on a base, preferably by pinned connections. A carriage is mounted in the frame and is vertically positioned by one or more hydraulic cylinders. Attached to the carriage are one or more positioning arms, in such a manner that the positioning arms can be pivoted in a vertical plane. The positioning arms can be pivoted by extension and retraction of hydraulic cylinders connecting the carriage and the positioning arms. A power swivel is held by the positioning arms. Pivoting the positioning arms moves the power swivel horizontally into and out of alignment with the well being serviced. | 09-08-2011 |
20110259640 | Pivoting Pipe Handler for Tender Assisted Drilling Rigs - A pivoting pipe handler for tender assisted drilling rigs is provided that includes a main support structure configured for attaching to a drilling rig at an angle between a drilling rig floor at an upper and a lower platform adjacent thereto. The pipe handler includes a V-door that is pivotally attached to the main support structure at an upper end and further includes an elevating mechanism to raise the lower end of the V-door so that the V-door can move from an inclined position to a horizontal position. The V-door can further include a pipe carrier slidably disposed thereon to extend outwardly from the V-door to the drilling rig floor. The V-door can also include pipe indexers to move tubulars from a storage area on the V-door onto the pipe carrier in addition to pipe kickers to eject tubulars from the pipe carrier to the storage area. | 10-27-2011 |
20110315446 | METHOD AND DEVICE FOR TRANSPORTING PIPESTRINGSECTIONS BETWEEN A STORAGE UNIT AND A DRILL RIG - A method and a device for transporting pipe string sections ( | 12-29-2011 |
20120118639 | APPARATUS AND METHOD FOR HANDLING PIPE - An apparatus is provided for moving pipe between pipe storage racks and a pipe handler on a pipe deck of a drilling rig. The apparatus is capable of retrieving pipe from tiered stacks of pipe in a pipe rack located behind Samson posts, and moving the pipe up and over the Samson posts onto a pipe stand or pipe handler. | 05-17-2012 |
20130206478 | Drilling System and a Device for Assembling and Disassembling Pipe Stands - A system for storing one or more tubulars comprises a drilling deck including a hole offset from a wellbore centerline. In addition, the system comprises a rack unit coupled to the drilling deck and extending downward from the hole in the drilling deck. The rack unit comprises a tubular housing having a longitudinal axis, an upper end, and a lower end opposite the upper end. The rack unit also comprises a first rack disposed within the body, wherein the first rack is moveably coupled to the body. | 08-15-2013 |
20130213715 | PARKING AND AUTOMATIC HANDLING EQUIPMENT OF DRILLING RODS AND ASSOCIATED DRILLING MACHINE - Parking and automatic handling equipment of drilling rods ( | 08-22-2013 |
20140083774 | DRILLING TOOL CHANGER APPARATUS - A drilling tool changer apparatus for a drilling rig includes a drill tower pivotable between a drilling orientation and a change-out orientation, the drill tower supporting a drill string comprising a drill pipe coupled to a drilling tool. The drilling tool changer apparatus also includes a drilling tool storage device pivotally movable about a hinge axis between a stowed position and a deployed position. The drilling tool storage device includes a drilling tool storage cassette including a replacement drilling tool. The drilling tool storage device and the drill tower are pivotally alignable in a substantially co-planar manner when the drilling tool storage device is in the deployed position and the drill tower is in the change-out orientation. | 03-27-2014 |
20140110173 | APPARATUS AND METHOD FOR SERVICING PIPES - An apparatus for servicing pipes includes a pipe holder having a frame configured to support the pipe and a movement assembly coupled to the frame and configured to rotate the pipe about a longitudinal axis of the pipe, and a first pipe servicing tool disposed proximate to an end of the pipe holder, where the first pipe servicing tool is configured to operably engage an end of the pipe when the pipe is rotated by the movement assembly. | 04-24-2014 |
20140110174 | Simultaneous Tubular Handling System - A system and method for building and handling oilfield tubular stands while drilling operations are simultaneously and independently occurring with one drilling deck, one derrick, and one rotary system. An offline guided path horizontal to vertical arm lifts and moves in the same plane tubulars stored horizontally on the catwalk and positions the tubulars vertically directly into a preparation hole for assembling and disassembling tubular stands while online drilling operations are simultaneously being conducted. A stand arm lifts and lowers the tubulars into and out of the adjustable preparation hole, and transports the tubulars for storage to an auxiliary tubular racking station in the upper part of the derrick. A bridge racker crane moves tubular stands from the auxiliary tubular racking station to the top drive or another tubular racking station. | 04-24-2014 |
20140151124 | Tool For Use On Exit Side Of Bore An Method Of Use Thereof - A tool for making up and breaking out a drill string at an exit side of a bore. The tool includes a fixed vice and a moveable vice for torqueing a pipe joint, a roller assembly for threading and unthreading adjacent sections of pipe, and a retainer assembly to retain a detached pipe section. The components of the tool are mounted on a frame, which is pivotally connected to a hydraulic machine such as an excavator. Thus, the tool may be manipulated to remove and add sections of pipe to a drill string remote from the primary horizontal directional drill. | 06-05-2014 |
20140182936 | Storage, Handling and Positioning Device for Drill Rods and Methods Thereof - Implementations described herein comprise systems, apparatus and methods for drill string component storage, handling and positioning devices. The handling device can comprise a magazine assembly configured for storing and handling elongate members having a magazine assembly and at least one conveyor roller chain operatively associated with the magazine assembly. The magazine assembly can further comprise an internal path having a loading aperture and a dispensing aperture disposed on opposing ends of the internal path. The at least one conveyor roller chain can be configured to controllably urge the at least one drill string component from the loading aperture to the dispensing aperture. The handling device can further comprise an armature assembly operatively associated with the magazine assembly. The armature assembly can be configured to selectively grasp one of the at least one drill string components located at the dispensing aperture and subsequently move the drill string component to a desired position. | 07-03-2014 |
20140238745 | Pipe Handler - A pipe handler trailer assists with the handling of very large and heavy pipes that are regularly raised to and lowered from an elevated surfaces. A height adjustment assembly sets the maximum height that a skidway will reach when a lift cylinder is fully extended and lift arms are thereby rotated. Located within lift arms are toothed racks. An adjustment block couples the skidway to lift arms through the racks and also supports locking blocks that have teeth complementary to the teeth on the racks. A lock will vary from firm contact with the inner wall of lift arms to having a gap there between. When the lock engages the inner wall of the lift arm this drives the complementary teeth into secure engagement with the rack teeth, which can then rigidly support heavy load without motion. | 08-28-2014 |
20140262517 | DRILLING RIG FOR DRILLING FROM UNDERGROUND TUNNELS - A rig for drilling a borehole from an underground tunnel includes a base assembly, a drilling assembly mounted to the base assembly, an upper frame assembly mounted to the drilling assembly above the base assembly, and a support hood coupled to the drilling assembly and positioned above the upper frame assembly. The support hood is configured to bear against a ceiling of the tunnel during drilling operations. | 09-18-2014 |
20140353038 | WELL DRILLING TUBULARS BIN SYSTEM, AND METHOD FOR USE OF SYSTEM - A well drilling tubulars bin system comprises a well drilling tubulars bin and control device. The bin comprises a frame structure, and an elevator mechanism, for holding multiple layers of a plurality of well drilling tubulars. The elevator mechanism comprises a liftable support structure, and a left and right hydraulic cylinder. The support structure is liftable from a lower position to an upper position. The support structure is raised and lowered in a level manner, or with a tilt angle. The elevator mechanism comprises a first left lift arm and a first right lift arm. The first left and right lift arms are at a first end rotatably connected to the support structure, and at a second end opposite from the first end rotatably connected to the frame structure. The left and right hydraulic cylinders are connected to the respective lift arms for rotating the respective lift arm. | 12-04-2014 |
20150008038 | APPARATUS FOR DELIVERING DRILL PIPE TO A DRILL RIG - An apparatus for delivering drill pipe has a support frame, a catwalk platform, and a slide platform that are pivotally connected together. A drill pipe rack, a chain drive, and a kicker direct the drill pipe to and from the catwalk platform. A hydraulically actuated piston lifts the catwalk platform and slide platform into alignment to create a single inclined delivery platform extending from the ground to the rig floor. A powered means lifts or lowers the drill pipe along the delivery platform. | 01-08-2015 |
20150008039 | MODULAR DRILLING RIG SYSTEM - Modular transfigurable drilling rig system composed of multiple components, which system is transfigurable between a transport mode in which the components of the system are transportable and an operational mode in which the components are assembled to a drilling rig which is adapted to drill into a well centre in the ground. | 01-08-2015 |
20150047904 | UNIVERSAL PIPE DISPATCH FOR DRILL PIPE JOINTS - A universal pipe dispatch, comprising a self-contained pipe joint dispatch module. The dispatch module includes, all in a unitary mobile structure, (1) a pipe joint queuing mechanism, (2) a pipe joint magazine, (3) a plurality of extendable pipe joint delivery arms and (4) a tilting mechanism. The queuing mechanism unloads and loads up pipe joints via gravity-feed, one-by-one, out of and back into the magazine. The delivery arms selectively pick and release pipe joints as dispensed by, or loaded back up into, the queuing mechanism. Each delivery arm can extend a selected length away from the queuing mechanism so as to deliver and retrieve pipe joints anywhere within reach of the delivery arms. The tilting mechanism is affixed to the underside of the dispatch module and can elevate one end of the dispatch module to a selected height so that the dispatch module rests at a predetermined horizontal angle. | 02-19-2015 |
20150144402 | HANDLING DEVICE AND METHOD FOR HANDLING DRILL STRING COMPONENTS IN ROCK DRILLING AND ROCK DRILL RIG - A handling device for handling drill string components with respect to a rock drill rig including a rotator device supported on a feed beam and arranged to rotate and drive a drill string component. A gripper grips drill string components. The gripper is swingably supported around a first swing axis between: a first position aligned with the active drill string position, and a second position aligned with a delivering position for drill string components. A swing arm includes a support configured to support a drill string component and is swingable around a second swing axis. A guiding beam is fastenable at end regions in connection with respective regions of the first and second swing axis. The guiding beam forms mechanical stops for the gripper in the second position and for the swing arm in the delivering position. Also, a rock drill rig and a method. | 05-28-2015 |
20150315857 | DEVICE FOR HANDLING DRILL STRING COMPONENTS OF A DRILL STRING, METHOD FOR HANDLING DRILL STRING COMPONENTS AND ROCK DRILLING RIG - A handling device for a rock drill rig for handling drill string components for a drill string. The handling device includes a linear guide, a slide being displaceable along the linear guide, and, supported by the slide, a gripping device, being displaceable between a drill string position in the rock drill rig and a delivering position outside the rock drill rig. The gripping device is supported by a swing arm that is swing drivable around a first rotational axis. The swing arm is swing drivable with respect to the slide around a second rotation axis. The swing arm support and the swing arm are swing drivable around a third rotational axis for swinging the gripping device to the drill string position. Also method and a rock drill rig. | 11-05-2015 |
20150330163 | GRIPPER FOR A DRILL STRING COMPONENT HANDLING DEVICE, METHOD FOR MANOEUVRING A GRIPPER, DRILL STRING COMPONENT DEVICE AND ROCK DRILL RIG - A gripping device for a drill string component handling device in a rock drill rig. Gripper element pairs are supported by a body and include at least one gripper element, being pivotally movable around a pivot joint, between a closed position, including a gripping position, and an open position. The pivotally movable gripper element is pivotal in a respective gripper plane forming a right angle to an axial direction. Each movable gripper element includes an actuation portion, which co-operates with a wedge device being movable in directions parallel to the axial direction for pivoting said movable gripper element. A method, a drill string component handling device for a rock drill rig and a rock drill rig including a drill string component handling device. | 11-19-2015 |
20150368993 | Core Drilling Components and Methods - The present invention provides a drilling tower having a rod handling tower allowing for the retrieval of rods from a rod rack system in an automated manner. The present invention also provides a method to deliver and install a core drilling platform in a remote area and its removal by air. The present invention also provides a cold box assembly for the storage of core drilling samples. | 12-24-2015 |
20160053558 | Triple Activity System for Drilling Operations - This invention relates to a drilling rig or a drill ship having a first activity centre with a main well, a second activity centre with an auxiliary well and a third activity centre with offline casing and drill pipe stand-building capabilities. The offline casing and drill pipe stand-building facility is a standalone feature and can be located in the forward or aft side of a drilling rig or drill ship depending on the choice of the builder or operator. | 02-25-2016 |
20160060981 | System and Method for Manipulating Tubulars for Subterranean Operations - A method for manipulating tubulars for subterranean operations including providing a first tubular at an initial position, wherein in the initial position the first tubular is in a substantially horizontal position and a proximal end region of the first tubular is position on a predetermined vertical axis, engaging the first tubular at the proximal end region with an engagement head, and lifting the first tubular at the proximal end region along the predetermined vertical axis and rotating the first tubular to change a position of the first tubular from the substantially horizontal position to a substantially vertical position, wherein in the substantially vertical position a longitudinal axis of the first tubular has an angular variation with respect to a predetermined vertical axis of not greater than about 5 degrees. | 03-03-2016 |
20160102508 | AUTOMATED BOOTSTRAP QUAD-MAST RIG - A method that includes vertically assembling a mast having a height greater than one hundred eighty feet; securing the mast to a rig floor of a land-based drilling rig; securing a racking board adjacent the mast at a height greater than one hundred feet above the rig floor; drilling a wellbore under the rig floor with a drill string; lifting with lifting equipment coupled to the drilling mast, a stand forming a part of the drill string and having a stand length greater than one hundred feet, from a drilling position partially within the wellbore and partially above the rig floor to an in-line position above the wellbore and proximate the racking board; removing the stand from the drill string; and moving the stand, using an automated pipe handling tool, from the in-line position to a racked position so that the stand is accommodated within the racking board. | 04-14-2016 |
20160115746 | HANDLING DEVICE FOR DRILL STRING COMPONENT IN RESPECT OF A ROCK DRILL RIG AND ROCK DRILL RIG - A handing device for handling drill string components in a rock drill rig. The handing device includes a magazine for storing drill string components to be introduced into and removed from a drill string position of the drill rig. The magazine includes, in the region of a loading position, a transfer unit for separation of a drill string component being positioned on a support from an adjacent drill string component and to transfer the separated drill string component to the loading position. The transfer unit includes a plurality of pivot arms being pivotal around a pivot axis, being parallel to the axial direction, from a first position. The pivot arms lie against a drill string component being closest to the loading position on the support, to a second position. The pivot arms allow bringing down the separated drill string component to the loading position. Also a rock drill rig. | 04-28-2016 |
20160130890 | DEVICE FOR HANDLING DRILL STRING COMPONENTS AND ROCK DRILL RIG - A handling device for handling drill string components in a rock drill rig which includes a rotator device being arranged for rotation and driving of a drill string component and being supported movable to and fro on a feed beam. The handling device includes an introducing unit configured to introduce drill string components into respectively remove drill string components from a drill string position of the rock drill rig. A guiding beam includes a longitudinal guide. A gripper shuttle is drivingly displaceable along the longitudinal guide. The gripper shuttle includes a pivotally arranged guiding gripper for gripping a first end region of a drill string component. The gripper shuttle carries a drive motor for driving a drive wheel. The drive wheel is disengageable to allow essentially free movement of the gripper shuttle along the longitudinal guide. Also. a rock drill rig. | 05-12-2016 |
20160251906 | TELESCOPIC MAST FOR DRILLING AND ASSOCIATED DRILLING RIG | 09-01-2016 |