US20120177471A1 - Extendible dipper with extruded portion for a backhoe arm - Google Patents

Extendible dipper with extruded portion for a backhoe arm Download PDF

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Publication number
US20120177471A1
US20120177471A1 US13/497,109 US200913497109A US2012177471A1 US 20120177471 A1 US20120177471 A1 US 20120177471A1 US 200913497109 A US200913497109 A US 200913497109A US 2012177471 A1 US2012177471 A1 US 2012177471A1
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US
United States
Prior art keywords
rectilinear
extendible
profile
dipper assembly
dipper
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
US13/497,109
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English (en)
Inventor
Philippe Valentini
Christophe Cartry
Jimmy Reverdy
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Volvo Compact Equipment SAS
Original Assignee
Volvo Compact Equipment SAS
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 Volvo Compact Equipment SAS filed Critical Volvo Compact Equipment SAS
Assigned to VOLVO COMPACT EQUIPMENT SAS reassignment VOLVO COMPACT EQUIPMENT SAS ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: REVERDY, JIMMY, CARTRY, CHRISTOPHE, VALENTINI, PHILIPPE
Publication of US20120177471A1 publication Critical patent/US20120177471A1/en
Abandoned legal-status Critical Current

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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
    • E02F3/30—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 with a dipper-arm pivoted on a cantilever beam, i.e. boom
    • E02F3/306—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 with a dipper-arm pivoted on a cantilever beam, i.e. boom with telescopic dipper-arm or boom

Definitions

  • the invention relates to the field of construction equipment machines having a backhoe arm where a part of the arm is extendible.
  • a backhoe that is a piece of equipment where a bucket is mounted at the end of an arm, the arm being itself mounted on a chassis of machine.
  • the arm usually comprises at least a boom, which is articulated to the chassis through at least a horizontal axis, and very often also around a vertical axis, and a dipper which is articulated at the free end of the boom around another horizontal axis.
  • the dipper may also be articulated with respect to the boom around a vertical axis.
  • Each of these movements is controlled by a power cylinder, usually a hydraulic cylinder, respectively a boom cylinder for controlling the movement of the boom relative to the chassis and a dipper cylinder for controlling the movement of the dipper relative to the boom.
  • the bucket is articulated to the dipper around another horizontal axis and is controlled by another cylinder.
  • the bucket and the arm can be controlled to pull back material towards the chassis of the machine.
  • the dipper part of the arm is extendible, that is it comprises a proximal part articulated to the boom and a distal part which is slidingly connected to the proximal part so as to form a length-adjustable dipper assembly.
  • a cylinder is in most cases provided for adjusting the relative position of the two parts of the dipper.
  • the dipper is made of an elongated hollow box section made of metal.
  • a conventional way of making a dipper is to weld together four elongated plates of metal at or near their longitudinal edges in order to form the box section.
  • a slide mechanism connecting the two parts of the dipper in a way that the two parts may slide relative one the other along a longitudinal direction but that they are otherwise rigidly connected along all other directions.
  • Such slide mechanism is known where one part is equipped with two parallel rails, and where the other part is equipped with a set of slides which slide on at least two opposite surfaces of each of the rails to achieve the desired sliding junction of the two parts.
  • the rails may be welded on the corresponding part.
  • one part of the dipper which comprises an extruded U shaped rectilinear portion to which is welded another U shaped portion. The two U shaped portions are mounted upside down.
  • the extruded welded portion may comprise rails which are formed by extrusion together with the rectilinear U shaped extruded portion.
  • This long known fabrication technique has proven successful but needs very careful welding operations. Indeed, it is well known that welding operations, which involve localized heating and subsequent cooling of the portions to be assembled, tend to generated internal stresses in the final object which cause deformations of said object. Such deformations are unacceptable when it is required that the object is to be joined to another object through a very precise sliding connection. Therefore, such cautious welding operations which are necessitated with the known fabricating techniques of extendible dipper arms make them expensive.
  • an extendible dipper assembly for a backhoe arm for a construction equipment machine, said arm comprising a boom to be attached to the machine, and an extendible dipper assembly articulated at the free end of the boom for holding a working tool, said extendible dipper assembly comprising a proximal part articulated to the boom and a distal part which is slidingly connected to the proximal part so as to form a length-adjustable dipper assembly, characterized in that at least one of the dipper parts comprises, a rectilinear profile made by extrusion of metal, said profile having a closed cross-section around at least one inner cavity.
  • FIG. 1 is a schematic side view of a backhoe loader equipped with an extendible dipper.
  • FIG. 2 is a schematic perspective view of the distal and proximal parts of a length-adjustable dipper assembly.
  • FIG. 3 is a schematic transversal section of a length-adjustable dipper assembly, showing the sliding connection of the proximal and distal parts of the dipper assembly.
  • FIG. 4 is a schematic perspective view of an extruded linear profile from which a dipper part according to the invention can be made.
  • FIG. 5 is a cross section of the extruded linear profile shown on FIG. 4 .
  • FIG. 1 On FIG. 1 is shown a construction equipment machine 10 of the so-called backhoe-loader type.
  • Such machine comprises a chassis 12 mounted on four wheels and a cabin 14 mounted on the chassis for receiving an operator of the machine.
  • a bonnet 16 receives the machine's main engine.
  • Such a machine therefore exhibits the main looks of an agricultural tractor. It derives its name from the fact that it carries two main pieces of equipment, namely a loader equipment 18 at the front, and a backhoe equipment 20 at the rear.
  • the loader equipment 18 comprises essentially two loader arms 22 which are articulated on the chassis around a horizontal axis Al near the rear end of the bonnet 16 and which extend longitudinally towards the front on both sides of the bonnet 16 .
  • a loader bucket 24 At the free ends of the loader arms, in front of the bonnet 16 , a loader bucket 24 having a generally forward facing cavity is articulated around a horizontal axis A 2 .
  • the backhoe equipment 20 comprises a backhoe arm 26 which is articulated on the chassis 12 and which carries at its free end a working tool such as an excavator bucket 28 .
  • the backhoe arm 26 comprises a boom 30 and an extendible dipper assembly 32 .
  • the boom 30 is articulated to the chassis around a horizontal axis A 3 and around a vertical axis A 4 , each rotation movement being controlled by at least one actuator, usually a hydraulic cylinder. As better seen on FIG.
  • the dipper assembly 32 comprises two main parts, namely a proximal part 34 which is articulated at one end around a horizontal axis A 5 at the free end of the boom 30 , and a distal part 36 which is slidingly connected to the proximal part 34 so as to extend along a lengthwise axis X-X beyond the free end of the proximal part 34 .
  • the two parts 34 , 36 are connected by an actuator, not shown on the drawings but usually embodied as a hydraulic cylinder, to expand or retract the distal part with respect to the proximal part, thereby adjusting the length of the dipper assembly 32 .
  • the excavator bucket 28 is articulated at the free end 40 of the distal part 34 around a horizontal axis A 6 .
  • the proximal part 34 of the dipper assembly 32 is for example a fabricated steel sheet structure which extends along the lengthwise axis X-X of the dipper assembly and which exhibits approximately the shape of a U when viewed in cross section, the U shape enclosing partially an inner space 38 which is open towards its top, at least along a substantial portion of the proximal part 34 .
  • the distal part 36 is at least partially received within the inner space 38 of the proximal part 34 , both lengthwise and in cross section. In any case, at least in an extended configuration, the free end 40 of the distal part 36 extends lengthwise beyond the free end 42 of the proximal part 34 , outside of inner space 38 .
  • the proximal part of the dipper is fabricated with metal plates which are welded together, mainly two lateral plates 44 which extend parallel one to the other, and a cross plate 46 which extends between the two lateral plates 44 .
  • the proximal part also comprises bushes and reinforcements which are mainly made as welded add-on parts.
  • a backhoe loader such as the one described above is well known to the skilled man in the art and is for example commercially available as “Volvo BL 71 ”.
  • the distal part 36 of the dipper assembly comprises a rectilinear profile 48 made by extrusion of metal, said profile having a closed cross-section around at least one inner cavity 50 .
  • the rectilinear profile 48 is best shown on FIGS. 4 and 5 where it is represented just after its fabrication by the extrusion process.
  • the rectilinear profile extends along the lengthwise axis X-X of the dipper assembly, and it is therefore possible to define the axis X-X as being the extrusion axis.
  • the inner cavity 50 is closed when viewed in cross section along a plane perpendicular to axis X-X, as represented.
  • the rectilinear portion exhibits a continuous wall portion which extends around axis X-X. Therefore, the rectilinear profile is inherently very rigid, and inherently resists to flexions around any axis perpendicular to the lengthwise axis X-X, but also resists to torsion around said lengthwise axis X-X.
  • the rectilinear profile 48 encloses only one inner cavity 50 which is substantially rectangular in cross section, with rounded angles.
  • the rectilinear profile comprises a continuous wall made of mainly four wall portions, two lateral wall portions 52 and two cross wall portions which can be called top wall portion 54 and bottom wall portion 56 .
  • Top and bottom simply refer to the drawings and are not to be construed as limiting the scope of the invention.
  • the lateral wall 54 portions are parallel one to the other and the cross wall portions 56 are also parallel one to the other, but perpendicular to the lateral wall portions.
  • Each lateral wall portion 54 is connected to the two cross wall portions 56 by a rounded wall portion, and vice-versa.
  • the rectilinear profile comprises two rectilinear protrusions 58 which extend each outwardly in cross section from the lateral wall portions 52 and which each form a rail for slidingly connecting the proximal part 34 to the distal part 36 .
  • the protrusions are located near the bottom wall portion 56 .
  • they exhibit a triangular cross section with one side being simply adjacent to the corresponding lateral wall portion, an upper side 60 perpendicular to the lateral wall portion and a lower side 62 which is slanted at approximately 45 degrees and which merges with the bottom wall portion 56 .
  • both rectilinear protrusions 58 are preferably formed by extrusion together with the rectilinear profile. This of course eases considerably the assembly and the operation of the dipper inasmuch as, being obtained through the extrusion process, the protrusions have a well defined geometry and have a well defined location with respect one to the other and with respect to the other wall portions of the rectilinear profile.
  • the upper and lower surfaces of the protrusions need not necessarily be further machined after extrusion to exhibit the dimensions and surface geometries required for them to function as guiding surfaces in the sliding connection between the two parts of the dipper.
  • the two rectilinear protrusions 58 are located un-symmetrically with respect to a geometric axis of the cavity.
  • the cavity 52 is: symmetrical around a central axis which can be considered to correspond to the lengthwise axis X-X mentioned above. Rather than being at the level of the axis X-X, the protrusions extend near the bottom wall 56 .
  • the top wall portion 54 has an increased thickness in comparison to the thickness of the bottom wall portion 56 .
  • the thickness of the top wall portion is preferably at least 25% superior to that of the bottom wall portion, but can be more than 50% superior.
  • the bottom wall portion 56 is here represented has having approximately the same thickness as the two lateral wall portions 52 but it could in fact exhibit a lower thickness than the two lateral portions.
  • the rectilinear profile 48 is designed so that it resists to all the stresses it will meet in operation, but the advantage of providing an excess thickness in the upper wall portion 54 , i.e.
  • the wall portion which is on the opposite to the protrusions 58 with respect to the cavity axis X-X is that the centre of gravity of the profile, when considered in cross section, is close to the axis of symmetry of the cavity, despite the un-symmetrical locations of the protrusions 58 .
  • This allows an easier production of the profile 48 with the protrusions 58 by the known extrusion techniques.
  • the rectilinear profile 48 can be made of steel having an elastic limit of at least 240 MPa, or even of at least 360 MPa.
  • the rectilinear profile 58 could be made of aluminium or of an aluminium alloy.
  • the rectilinear profile 48 is devoid of welding around its cross-section. This avoids any deformation which may be caused by a welding operation.
  • the rectilinear profile 48 is a base element of the distal part 32 , but the rectilinear profile may be transformed to form the distal part, and the distal part may also comprise other components.
  • the rectilinear profile will be cut at the right length for forming the distal part. Holes may be drilled in the profile, for example at axis A 6 for receiving an articulation for the working tool.
  • articulation holes may reinforced by the provision of bushings which may be welded on the rectilinear profile.
  • brackets may be fixed on the rectilinear profile, by welding or by other attaching means, for example for the connection of the power cylinders which control the extension of the dipper assembly and/or control the movement of the working tool.
  • the distal, part 36 of the dipper assembly 32 which comprises a rectilinear profile 48 made by extrusion of metal according to the invention, while the proximal part is of a more conventional design.
  • the proximal part 34 of the dipper assembly 32 could also or alternatively comprise a rectilinear profile made by extrusion of metal according to the invention.
  • the cross-section of the rectilinear profile and of its inner cavity could be other than rectangular, and could be for example in the shape of a trapeze, circle, oval, or even exhibit a more complex design, such as the shape of an X.
  • the cross-section could also be non-symmetric, not withstanding the further un-symmetrical location of the protrusions.
  • the rectilinear profile could comprise more than one cavity defined within the closed cross section.
  • the inner cavity could exhibit several partitions formed by a wall portion obtained directly during the extrusion process.
  • the invention has been described in the context of a backhoe arm to be mounted on a backhoe-loader, but it would obviously be applicable in any type of backhoe arm, for example for use on an excavator.

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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)
  • Body Structure For Vehicles (AREA)
US13/497,109 2009-09-21 2009-09-21 Extendible dipper with extruded portion for a backhoe arm Abandoned US20120177471A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2009/007276 WO2011033336A1 (fr) 2009-09-21 2009-09-21 Godet extensible avec partie extrudée pour un bras de pelleteuse

Publications (1)

Publication Number Publication Date
US20120177471A1 true US20120177471A1 (en) 2012-07-12

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US13/497,109 Abandoned US20120177471A1 (en) 2009-09-21 2009-09-21 Extendible dipper with extruded portion for a backhoe arm

Country Status (5)

Country Link
US (1) US20120177471A1 (fr)
EP (1) EP2480726A1 (fr)
BR (1) BR112012006335A2 (fr)
RU (1) RU2012116002A (fr)
WO (1) WO2011033336A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10662609B2 (en) 2018-04-11 2020-05-26 Deere & Company Hybrid loader boom arm assembly
US10697148B2 (en) 2018-04-11 2020-06-30 Deere & Company Hybrid loader boom arm assembly
US10822768B2 (en) 2018-04-11 2020-11-03 Deere & Company Hybrid loader boom arm assembly
US11298783B1 (en) * 2017-09-22 2022-04-12 TAG Manufacturing, Inc. Method of manufacturing improved crossbar connection for implements

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1240986A (en) * 1970-02-05 1971-07-28 Ware Machine Works Inc Improvements to dipperstick assemblies
US3624785A (en) * 1970-12-07 1971-11-30 Morton A Wilson Extendable dipper-stick
US4274797A (en) * 1979-06-25 1981-06-23 Coon David B Backhoe excavating apparatus
FR2502132A1 (fr) * 1981-03-18 1982-09-24 Ppm Sa Fleche telescopique a troncons composites
JPS59147764U (ja) * 1983-03-23 1984-10-02 中島　哲郎 油圧式シヨベル等のア−ム部材
DE3575755D1 (de) * 1985-12-23 1990-03-08 Komatsu Mfg Co Ltd Vorrichtung zum antreiben des arbeitswerkzeuges eines baggers.
US4657112A (en) * 1986-04-25 1987-04-14 Up-Right, Inc. Mast construction for pedestal scaffold
US7537290B2 (en) * 2005-12-16 2009-05-26 U.S. Manufacturing Company Light weight, stiffened, twist resistant, extruded vehicle axle

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11298783B1 (en) * 2017-09-22 2022-04-12 TAG Manufacturing, Inc. Method of manufacturing improved crossbar connection for implements
US10662609B2 (en) 2018-04-11 2020-05-26 Deere & Company Hybrid loader boom arm assembly
US10697148B2 (en) 2018-04-11 2020-06-30 Deere & Company Hybrid loader boom arm assembly
US10822768B2 (en) 2018-04-11 2020-11-03 Deere & Company Hybrid loader boom arm assembly

Also Published As

Publication number Publication date
RU2012116002A (ru) 2013-10-27
BR112012006335A2 (pt) 2016-03-29
WO2011033336A1 (fr) 2011-03-24
EP2480726A1 (fr) 2012-08-01

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Legal Events

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AS Assignment

Owner name: VOLVO COMPACT EQUIPMENT SAS, FRANCE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:VALENTINI, PHILIPPE;CARTRY, CHRISTOPHE;REVERDY, JIMMY;SIGNING DATES FROM 20120306 TO 20120319;REEL/FRAME:027892/0074

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION