WO2007097698A1 - An arrangement related to a rotation device - Google Patents

An arrangement related to a rotation device Download PDF

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Publication number
WO2007097698A1
WO2007097698A1 PCT/SE2007/000166 SE2007000166W WO2007097698A1 WO 2007097698 A1 WO2007097698 A1 WO 2007097698A1 SE 2007000166 W SE2007000166 W SE 2007000166W WO 2007097698 A1 WO2007097698 A1 WO 2007097698A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure medium
implement
fastening device
rotation
lower fastening
Prior art date
Application number
PCT/SE2007/000166
Other languages
French (fr)
Inventor
Anders Jonsson
Original Assignee
Indexator Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Indexator Ab filed Critical Indexator Ab
Priority to EP07709376.3A priority Critical patent/EP1994232A4/en
Publication of WO2007097698A1 publication Critical patent/WO2007097698A1/en

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/3604—Devices to connect tools to arms, booms or the like
    • E02F3/3677—Devices to connect tools to arms, booms or the like allowing movement, e.g. rotation or translation, of the tool around or along another axis as the movement implied by the boom or arms, e.g. for tilting buckets
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/3604—Devices to connect tools to arms, booms or the like
    • E02F3/3677—Devices to connect tools to arms, booms or the like allowing movement, e.g. rotation or translation, of the tool around or along another axis as the movement implied by the boom or arms, e.g. for tilting buckets
    • E02F3/3681—Rotators
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/96—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements

Definitions

  • the present invention concerns an arrangement related to a rotation device for a machine provided with a working arm, for example an excavator or the like, according to the preamble of claim 1.
  • a rotation device for a machine provided with a working arm, for example an excavator or the like
  • Such rotation devices often comprise also a tilt device, e.g. to make it possible for work implements to tilt sideways.
  • ROTOTILT a registered trademark of Indexator AB
  • An object of the present invention is to propose a device which provides a very advantageous solution of the aforesaid problems, and this object is achieved by the device having the features indicated in the claims.
  • Fig. 1 shows an arrangement according to the invention in an exploded schematic view
  • Fig. 2 shows a gripping device according to the invention as viewed from above
  • Figs. 3 and 4 illustrate various valve positions.
  • FIG. 1 shows a section of a working arm 10 of a digging machine, which arm 10 has two fastening sockets 11,12 for connecting an upper fastening device 20, which fastening device 20 has two fastening pins 21,22 for engagement with the fastening sockets 11,12.
  • FIG. 30 It also shows a lower fastening device 30 which has recesses 31,32 to accommodate fastening pins 81,82 of a shown work tool 80 in the form of a digging bucket and to accommodate fastening pins 91,92 of an alternative work tool 90 in the form of a hydraulically powered vibrator plate.
  • the lower fastening device 30 is normally provided with a hydraulic locking device (not shown) to facilitate work implement changes.
  • a rotation device 40 is disposed between the upper fastening device 20 and the lower fastening device 30 and comprises a stator element 41 connected to the upper fastening device 20, and a rotor element 42 connected to the lower fastening device 30.
  • the rotation device 40 may also be supplemented by a tilt device (not shown) which is not described here in detail, since such products are well-known to those skilled in the art.
  • An example of such a product which may be mentioned is the ROTOTILT (registered trademark) marketed by Indexator AB.
  • the upper fastening device 20, the rotation device 40 and the lower fastening device 30 together constitute a link between the working arm 10 and an appropriate work tool 80, whereby the work tool can be rotated as a result of the rotation device 40 imparting desired rotary motion to the lower fastening device 30 and hence to the work tool 80.
  • the rotation device 40 is supplemented by tilt facilities, similar reasoning refers to a transfer of tilt motion to the work tool 80 via the lower fastening device 30.
  • an implement unit 50 in the form of a gripping device or gripping module adapted to being attached to the lower fastening device 30.
  • the gripping device 50 comprises two pressure-medium-operated gripping claws 51,52 which may for example be used for the lifting of pillars and other objects.
  • the gripping device 50 is for example intended to be used in combination with the work tool 80.
  • the gripping claws 51,52 are pivotingly operated by two pressure-medium cylinders/hydraulic cylinders 53,54.
  • the rotation device 40 comprises a swivel device 60 for transfer of pressure medium, whereby a movable element of the swivel device accompanies a rotary movement imparted to the lower fastening device 30 by the rotor 42 of the rotation device 40, while a fixed element of the swivel device 60 is arranged non-rotative relative to the stator 41 of the rotation device 40 and the upper fastening device 20.
  • the swivel device 60 has two ducts running through it for supply of pressure medium to the implement unit 50 which is attached to the lower fastening device 30 and which is intended to be used in conjunction with, for example, an appropriate first work implement 80.
  • the swivel device 60 also has two ducts running through it for supply of pressure medium to an implement locking device of the lower fastening device 30.
  • Fig. 1 The locations of lines/hoses for the pressure medium, e.g. hydraulic oil, are illustrated in Fig. 1.
  • Two main lines/hoses 100,101 run via the arm 10 from a pressure medium source of the work machine to a remote-controllable valve block 70 for further distribution to the rotation device 40 and any associated tilt device.
  • the lines/hoses between the valve block 70 and the rotation device 40 and the tilt device have been omitted in Fig. 1.
  • the valve block 70 is attached to the upper fastening device 20.
  • Two lines/hoses 102,103 run from the valve block 70 and are each connected to a respective throughflow duct of the swivel device 60.
  • Two lines/hoses 104,105 run from said throughflow ducts, the line/hose 104 to the cylinder 53 and the line/hose 105 to the cylinder 54 of the gripping device 50.
  • two further lines/hoses 106,107 run from the valve block 70 and are each connected to a respective throughflow duct of the swivel device 60.
  • Two lines/hoses 108,109 run from the mentioned throughflow ducts to the locking device of the lower fastening device 30.
  • the cylinders 53 and 54 each have a built-in or integrated directional valve 55 as indicated in Figs. 2-4.
  • the directional valves can be switched manually to the positions shown in Figs. 3 and 4.
  • the cylinders 53 and 54 are adapted to working in parallel and performing the same patterns of movement. This is achieved by internal parallel connections (not shown) whereby a connecting line/hose 56 provides necessary communication of medium between the cylinders 53 and 54.
  • the lines/hoses from the swivel device 60 can thus alternately serve as feed or return lines depending on the direction of movement of the cylinders at the time.
  • the lines/hoses 104,105 are connected to the cylinders at connection points 154 and 155 of the cylinders 53 and 54.
  • the two-position valves 55 are switched to the operating position shown in Fig. 3 whereby the cylinders 53 and 54 and the gripping claws 51 and 52 can be operated as desired. It should of course be noted that the valve 55 of the cylinder 53 is mirror-inverted relative to the valve 55 of the cylinder 54 so that intended communication paths are provided.
  • the gripping device 50 activated as above can operate in parallel or alternately with, for example, the work implement 80. If for example it is desired to replace the work implement 80 by a work implement 90 which requires pressure medium, the procedure is as follows. The work implement 80 is disconnected from the lower fastening device 30, followed by the work implement 90 being connected to the lower fastening device 30. Thereafter, lines/hoses 191,192 of the work implement 90 are connected to the connection points 193 and 194 of the cylinders 53 and 54, as indicated in the drawings. It is advantageous if these connections are effected by so-called quick-coupling arrangements. Thereafter, the valves 55 are switched to the operating position shown in Fig.
  • the implement 90 is thus provided with its supply of pressure medium and is ready for use, while at the same time the gripping device 50 is placed in a parking position.
  • valves 55 When thereafter the implement 90 is to be replaced by another work implement, the valves 55 will be switched to the position shown in Fig. 3, followed by the lines/hoses 191,192 being detached from the connection points 193,194, and the implement 90 being thereafter released from the lower fastening device 30.
  • the gripping device 50 is then activated and ready for use. Thereafter a desired work implement can be connected to the lower fastening device 30, and so on.
  • the arrangement according to the invention makes it possible in an extremely user-friendly manner to use work implements irrespective of whether they require pressure medium, and to use an implement unit which requires pressure medium in parallel with a work implement which does not require pressure medium.
  • the swivel device 60 has only two ducts running through it to supply pressure medium to the implement unit 50 and, after change of connections according to the invention, to supply pressure medium to a work implement.
  • the swivel device 60 has four ducts running through it, two of them for supplying pressure medium to a locking device of the lower fastening device 30, and the other two for supplying pressure medium to the implement unit 50 or, after valve switching, to a work implement which requires pressure medium.
  • the above arrangement makes possible a very simple swivel device 60 with four throughflow ducts while at the same time minimising the provision of lines/hoses, thereby achieving technical and economic advantages and minimising the amount of space needed.
  • valves 55 may of course be varied within the concept of the inventive idea.
  • the switching of the valves is preferably effected manually by changing the rotational position of an operating lever so that the set positions of the valves are displayed.
  • the valves may also be remote-controllable and may where necessary also have more than two valve outlets.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Joints Allowing Movement (AREA)
  • Component Parts Of Construction Machinery (AREA)
  • Earth Drilling (AREA)

Abstract

The invention concerns an arrangement related to a rotation device for a machine provided with a working arm, for example an excavator or the like, whereby the rotation device (40) is connectable via an upper fastening device (20) to a working arm (10) and via a lower fastening device (30) to an appropriate work implement (80). The rotation device (40) comprises a swivel device (60) for transfer of pressure medium, whereby a movable element of the swivel device (60) accompanies a rotation movement imparted to the lower fastening device (30) by a rotor (41) of the rotation device, while a fixed element of the swivel device (60) is non-rotative arranged relative to a stator (41) of the rotation device and the upper fastening device (20). The swivel device (60) has two ducts running through it for pressure medium for connection to an implement unit (50) which is attached to the lower fastening device (30) in order to be used in combination with a first work implement (80). Means (55) are provided for temporary switching of the pressure medium flow to said implement unit (50) to a second working implement (90) which requires pressure medium and which temporarily takes the place of the first work implement (80). The swivel device (60) also has two ducts running through it for pressure medium for connection to locking means of the lower fastening device (30).

Description

AN ARRANGEMENT RELATED TO A ROTATION DEVICE The present invention concerns an arrangement related to a rotation device for a machine provided with a working arm, for example an excavator or the like, according to the preamble of claim 1. There are on the market so-called rotation devices adapted to being used in relation to, for example, excavators to make it possible for appropriate work implements to swivel or rotate. Such rotation devices often comprise also a tilt device, e.g. to make it possible for work implements to tilt sideways. Such a combined rotation device and tilt device is marketed under the name ROTOTILT (a registered trademark of Indexator AB). Problems have been encountered in finding an easy way of integrating a rotation device between an upper fastening device connected to a working arm and a lower fastening device connected to a work implement with simultaneous transfer of necessary pressure medium, usually hydraulic oil, e.g. to a work implement or extra equipment or to control means at the lower fastening device. The problem is that the lower fastening device and any work implements and accessories associated with it are involved in a rotary movement.
One way of dealing with the mentioned problem is to provide a swivel device in the central region of the rotation device. However, achieving necessary pressure-medium communication via a swivel device has been found to be complicated and expensive, partly because there is a great need for the number of throughflow ducts related to the swivel device but at the same time there is little available duct space because of space limitations pertaining to the rotation device. The cross-sectional area of the throughflow ducts risks being insufficient for the desired flows of medium or oil. Swivel devices and their associated arrangements also tend to be expensive and troublesome.
An object of the present invention is to propose a device which provides a very advantageous solution of the aforesaid problems, and this object is achieved by the device having the features indicated in the claims.
The following may be mentioned among the many advantages of the invention. The invention makes possible a simpler swivel device with a smaller number of throughflow ducts, e.g. a four-duct swivel device may replace a six-duct swivel device. Hose locations, accessibility and maintenance are simplified. The invention affords both technical and economic advantages. An embodiment of the invention is described below in more detail with reference to the attached drawings, in which Fig. 1 shows an arrangement according to the invention in an exploded schematic view, Fig. 2 shows a gripping device according to the invention as viewed from above, and Figs. 3 and 4 illustrate various valve positions. Fig. 1 shows a section of a working arm 10 of a digging machine, which arm 10 has two fastening sockets 11,12 for connecting an upper fastening device 20, which fastening device 20 has two fastening pins 21,22 for engagement with the fastening sockets 11,12.
It also shows a lower fastening device 30 which has recesses 31,32 to accommodate fastening pins 81,82 of a shown work tool 80 in the form of a digging bucket and to accommodate fastening pins 91,92 of an alternative work tool 90 in the form of a hydraulically powered vibrator plate. The lower fastening device 30 is normally provided with a hydraulic locking device (not shown) to facilitate work implement changes.
A rotation device 40 is disposed between the upper fastening device 20 and the lower fastening device 30 and comprises a stator element 41 connected to the upper fastening device 20, and a rotor element 42 connected to the lower fastening device 30. The rotation device 40 may also be supplemented by a tilt device (not shown) which is not described here in detail, since such products are well-known to those skilled in the art. An example of such a product which may be mentioned is the ROTOTILT (registered trademark) marketed by Indexator AB. It emerges from the above description that the upper fastening device 20, the rotation device 40 and the lower fastening device 30 together constitute a link between the working arm 10 and an appropriate work tool 80, whereby the work tool can be rotated as a result of the rotation device 40 imparting desired rotary motion to the lower fastening device 30 and hence to the work tool 80. If the rotation device 40 is supplemented by tilt facilities, similar reasoning refers to a transfer of tilt motion to the work tool 80 via the lower fastening device 30. In the shown example is illustrated an implement unit 50 in the form of a gripping device or gripping module adapted to being attached to the lower fastening device 30. The gripping device 50 comprises two pressure-medium-operated gripping claws 51,52 which may for example be used for the lifting of pillars and other objects. The gripping device 50 is for example intended to be used in combination with the work tool 80. The gripping claws 51,52 are pivotingly operated by two pressure-medium cylinders/hydraulic cylinders 53,54. The rotation device 40 comprises a swivel device 60 for transfer of pressure medium, whereby a movable element of the swivel device accompanies a rotary movement imparted to the lower fastening device 30 by the rotor 42 of the rotation device 40, while a fixed element of the swivel device 60 is arranged non-rotative relative to the stator 41 of the rotation device 40 and the upper fastening device 20.
The swivel device 60 has two ducts running through it for supply of pressure medium to the implement unit 50 which is attached to the lower fastening device 30 and which is intended to be used in conjunction with, for example, an appropriate first work implement 80.
In the shown embodiment, the swivel device 60 also has two ducts running through it for supply of pressure medium to an implement locking device of the lower fastening device 30.
The locations of lines/hoses for the pressure medium, e.g. hydraulic oil, are illustrated in Fig. 1. Two main lines/hoses 100,101 run via the arm 10 from a pressure medium source of the work machine to a remote-controllable valve block 70 for further distribution to the rotation device 40 and any associated tilt device. For the sake of clarity, the lines/hoses between the valve block 70 and the rotation device 40 and the tilt device have been omitted in Fig. 1. The valve block 70 is attached to the upper fastening device 20.
Two lines/hoses 102,103 run from the valve block 70 and are each connected to a respective throughflow duct of the swivel device 60. Two lines/hoses 104,105 run from said throughflow ducts, the line/hose 104 to the cylinder 53 and the line/hose 105 to the cylinder 54 of the gripping device 50.
In the shown embodiment, two further lines/hoses 106,107 run from the valve block 70 and are each connected to a respective throughflow duct of the swivel device 60. Two lines/hoses 108,109 run from the mentioned throughflow ducts to the locking device of the lower fastening device 30. The cylinders 53 and 54 each have a built-in or integrated directional valve 55 as indicated in Figs. 2-4. The directional valves can be switched manually to the positions shown in Figs. 3 and 4. The cylinders 53 and 54 are adapted to working in parallel and performing the same patterns of movement. This is achieved by internal parallel connections (not shown) whereby a connecting line/hose 56 provides necessary communication of medium between the cylinders 53 and 54. The lines/hoses from the swivel device 60 can thus alternately serve as feed or return lines depending on the direction of movement of the cylinders at the time. The lines/hoses 104,105 are connected to the cylinders at connection points 154 and 155 of the cylinders 53 and 54.
During use of the gripping device 50, the two-position valves 55 are switched to the operating position shown in Fig. 3 whereby the cylinders 53 and 54 and the gripping claws 51 and 52 can be operated as desired. It should of course be noted that the valve 55 of the cylinder 53 is mirror-inverted relative to the valve 55 of the cylinder 54 so that intended communication paths are provided.
As previously mentioned, the gripping device 50 activated as above can operate in parallel or alternately with, for example, the work implement 80. If for example it is desired to replace the work implement 80 by a work implement 90 which requires pressure medium, the procedure is as follows. The work implement 80 is disconnected from the lower fastening device 30, followed by the work implement 90 being connected to the lower fastening device 30. Thereafter, lines/hoses 191,192 of the work implement 90 are connected to the connection points 193 and 194 of the cylinders 53 and 54, as indicated in the drawings. It is advantageous if these connections are effected by so-called quick-coupling arrangements. Thereafter, the valves 55 are switched to the operating position shown in Fig. 4 so that the lines/hoses 104 and 105 from the swivel device 60 communicate with the lines/hoses 191 and 192 as indicated in the drawings. The implement 90 is thus provided with its supply of pressure medium and is ready for use, while at the same time the gripping device 50 is placed in a parking position.
When thereafter the implement 90 is to be replaced by another work implement, the valves 55 will be switched to the position shown in Fig. 3, followed by the lines/hoses 191,192 being detached from the connection points 193,194, and the implement 90 being thereafter released from the lower fastening device 30. The gripping device 50 is then activated and ready for use. Thereafter a desired work implement can be connected to the lower fastening device 30, and so on.
It should be understood from the foregoing that the arrangement according to the invention makes it possible in an extremely user-friendly manner to use work implements irrespective of whether they require pressure medium, and to use an implement unit which requires pressure medium in parallel with a work implement which does not require pressure medium. In a simplified embodiment of the invention, the swivel device 60 has only two ducts running through it to supply pressure medium to the implement unit 50 and, after change of connections according to the invention, to supply pressure medium to a work implement.
In the embodiment of the invention shown in the drawings, the swivel device 60 has four ducts running through it, two of them for supplying pressure medium to a locking device of the lower fastening device 30, and the other two for supplying pressure medium to the implement unit 50 or, after valve switching, to a work implement which requires pressure medium.
The above arrangement makes possible a very simple swivel device 60 with four throughflow ducts while at the same time minimising the provision of lines/hoses, thereby achieving technical and economic advantages and minimising the amount of space needed.
It should be understood that the configuration and location of the two-way valves 55 may of course be varied within the concept of the inventive idea. The switching of the valves is preferably effected manually by changing the rotational position of an operating lever so that the set positions of the valves are displayed. The valves may also be remote-controllable and may where necessary also have more than two valve outlets.
Remote operation of the valves 55 will for example make it possible to effect remote- controlled alternate use of two accessories 50,90 which require pressure medium and are simultaneously attached to the lower fastening device 30. Component variations are of course possible within the concept of the inventive idea described above.
The invention is thus not limited to what is shown and described, since amendments and modifications are possible within the scope of the accompanying claims.

Claims

1. An arrangement related to a rotation device for a machine provided with a working arm, for example an excavator or the like, whereby the rotation device (40) is connectable via an upper fastening device (20) to a working arm (10) and via a lower fastening device (30) to a work implement, whereby the rotation device (40) comprises a swivel device (60) for transfer of pressure medium, whereby a movable element of the swivel device (60) accompanies a rotation movement imparted to the lower fastening device (30) by a rotor (41) of the rotation device, while a fixed element of the swivel device (60) is non-rotative arranged relative to a stator (41) of the rotation device and the upper fastening device (20), characterised in that the swivel device (60) has two ducts running through it for pressure medium for connection to an implement unit (50) which is attached to the lower fastening device (30) in order to be used in combination with a first work implement (80), and that means (55) are provided for temporary switching of the pressure medium flow to said implement unit (50) to a second working implement (90) which requires pressure medium and which temporarily takes the place of the first work implement (80).
2. An arrangement according to claim 1, characterised in that the swivel device (60) has two ducts running through it for pressure medium for connection to locking means of the lower fastening device (30).
3. An arrangement according to claim 1 or 2, characterised in that the switching means comprise valve units (55) which are settable in two positions and are disposed in the implement unit (50).
4. An arrangement according to any one of claims 1-3, characterised in that the switching means (55) are integrated with operating cylinders (53,54) of the implement unit (50).
5. An arrangement according to any one of claims 1-4, characterised in that the implement unit is a gripping module (50).
6. An arrangement according to any one of claims 1-5, characterised in that the rotation device (40) also comprises a tilt device to make it possible to tilt sideways the implement unit (50) and the work implement (80,90).
7. An arrangement according to any one of claims 1-6, characterised in that the switching means (55) are remote-switchable to supply pressure medium alternately to two accessories (50,90) requiring pressure medium which are simultaneously attached to the lower fastening device (30).
PCT/SE2007/000166 2006-02-26 2007-02-22 An arrangement related to a rotation device WO2007097698A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07709376.3A EP1994232A4 (en) 2006-02-26 2007-02-22 An arrangement related to a rotation device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0600422-0 2006-02-26
SE0600422A SE529658C2 (en) 2006-02-26 2006-02-26 Arrangement of a rotary device

Publications (1)

Publication Number Publication Date
WO2007097698A1 true WO2007097698A1 (en) 2007-08-30

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SE (1) SE529658C2 (en)
WO (1) WO2007097698A1 (en)

Cited By (10)

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WO2010047637A1 (en) 2008-10-21 2010-04-29 Svab Hydraulik Ab A control system for controlling a tiltrotator, a method for calibrating a control system of a tiltrotator and a method for leveling a tool attached to a tiltrotator
EP2208828A1 (en) 2009-01-19 2010-07-21 Kinshofer GmbH Coupling arrangement for tilting a tool
ITMO20090144A1 (en) * 2009-05-27 2010-11-28 Mantovanibenne S R L HYDRAULIC CONTROL DEVICE, IN PARTICULAR FOR OPERATING MACHINES.
US8146971B2 (en) 2007-08-31 2012-04-03 Lavalley Industries, Llc Grapple attachment for use with drill pipes
US8328071B2 (en) 2011-02-17 2012-12-11 Lavalley Industries, Llc Position adjustable grapple attachment
US8567836B2 (en) 2007-08-31 2013-10-29 Lavalley Industries, Llc Gripping assembly and gripping members for a grapple attachment
WO2014199260A2 (en) 2013-06-10 2014-12-18 Aker Mh As Lifting arm assembly and method of changing a holder in said lifting arm assembly
US8973244B2 (en) 2014-04-17 2015-03-10 Lavalley Industries, Llc Pipe processing tool with pipe deformation members
US9073732B2 (en) 2012-07-27 2015-07-07 Lavalley Industries, Llc Grab arm housing for grapple attachment
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Cited By (24)

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Publication number Priority date Publication date Assignee Title
US8348319B2 (en) 2007-08-31 2013-01-08 Lavalley Industries, Llc Grapple attachment for use with drill pipes
US9085944B2 (en) 2007-08-31 2015-07-21 Lavalley Industries, Llc Gripping assembly and gripping members for a grapple attachment
US8567836B2 (en) 2007-08-31 2013-10-29 Lavalley Industries, Llc Gripping assembly and gripping members for a grapple attachment
US8146971B2 (en) 2007-08-31 2012-04-03 Lavalley Industries, Llc Grapple attachment for use with drill pipes
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EP1994232A1 (en) 2008-11-26
SE529658C2 (en) 2007-10-16
EP1994232A4 (en) 2017-03-08

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