US20100098521A1 - Skid Steer Loaders with Variable Isolation on Vibratory Roller - Google Patents

Skid Steer Loaders with Variable Isolation on Vibratory Roller Download PDF

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Publication number
US20100098521A1
US20100098521A1 US12/578,999 US57899909A US2010098521A1 US 20100098521 A1 US20100098521 A1 US 20100098521A1 US 57899909 A US57899909 A US 57899909A US 2010098521 A1 US2010098521 A1 US 2010098521A1
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US
United States
Prior art keywords
isolators
variable
vibratory roller
skid steer
steer loader
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
US12/578,999
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English (en)
Inventor
Ahmet Kartal
Carl James Wieland
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.)
Doosan Bobcat North America Inc
Original Assignee
Clark Equipment Co
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 Clark Equipment Co filed Critical Clark Equipment Co
Priority to US12/578,999 priority Critical patent/US20100098521A1/en
Assigned to CLARK EQUIPMENT COMPANY reassignment CLARK EQUIPMENT COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WIELAND, CARL JAMES, KARTAL, AHMET
Publication of US20100098521A1 publication Critical patent/US20100098521A1/en
Assigned to HSBC BANK PLC reassignment HSBC BANK PLC SECURITY AGREEMENT Assignors: CLARK EQUIPMENT COMPANY
Assigned to CLARK EQUIPMENT COMPANY reassignment CLARK EQUIPMENT COMPANY RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: HSBC BANK PLC
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
    • E02F3/96—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements
    • E02F3/967—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements of compacting-type tools
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
    • E01C19/23—Rollers therefor; Such rollers usable also for compacting soil
    • E01C19/28—Vibrated rollers or rollers subjected to impacts, e.g. hammering blows
    • E01C19/281—Vibrated rollers or rollers subjected to impacts, e.g. hammering blows propelled by hand or by vehicles, e.g. towed
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
    • E01C19/23—Rollers therefor; Such rollers usable also for compacting soil
    • E01C19/28—Vibrated rollers or rollers subjected to impacts, e.g. hammering blows
    • E01C19/286—Vibration or impact-imparting means; Arrangement, mounting or adjustment thereof; Construction or mounting of the rolling elements, transmission or drive thereto, e.g. to vibrator mounted inside the roll
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/08—Superstructures; Supports for superstructures
    • E02F9/0808—Improving mounting or assembling, e.g. frame elements, disposition of all the components on the superstructures
    • E02F9/0816—Welded frame structure

Definitions

  • vibratory rollers Mounted within vibratory rollers are powered shafts that are generally driven by hydraulic motors. Attached to the shaft are weights that are placed with their mass centers a distance away from the axis of rotation of the shaft, thereby creating centripetal force with shaft rotation, referred to by the industry as dynamic force.
  • the dynamic forces are used to compact substrates prior to construction but are also transmitted through frame members of the attachment to the carrier and ultimately to the operator.
  • vibratory rollers can cause a high degree of vibration in the loader, and ultimately for the operator.
  • skid steer loaders and vibratory roller attachment embodiments in which an improved variable isolator is provided to isolate the skid steer loader, and thus the operator of the loader, from the severity of the vibrations in the vibratory roller.
  • the vibratory roller attachment includes a frame configured to be mounted to the skid steer loader.
  • a drum is supported by the frame, and an eccentric weight is positioned within the drum.
  • a plurality of variable isolators couple the drum to the frame to provide isolation of the skid steer loader from vibrations of the vibratory roller.
  • the plurality of variable isolators each have a non-cylindrical exterior shape.
  • the non-cylindrical shape can include an exterior surface having curved end portions separated by a substantially linear middle portion to allow for improved deflection of the variable isolators, and thus improved vibration isolation between the attachment and the skid steer loader.
  • FIG. 1 is a perspective view of a skid steer loader with a vibratory roller attachment.
  • FIG. 2 is a diagrammatic perspective view illustration of interior portions of the vibratory roller attachment, showing variable isolators in accordance with disclosed embodiments.
  • FIGS. 3-6 are diagrammatic side view illustrations of portions of the vibratory roller attachment of FIGS. 1 and 2 .
  • FIG. 7 is a diagrammatic perspective view illustration of interior portions of the vibratory roller attachment of FIGS. 1-6 .
  • FIG. 8 is a diagrammatic perspective view illustration of a variable isolator in accordance with disclosed embodiments.
  • FIGS. 9 and 10 are diagrammatic side view illustrations of a variable isolator in accordance with disclosed embodiments.
  • FIG. 11 is a shear load deflection chart for a variable isolator in accordance with disclosed embodiments.
  • FIG. 12 is a compression load deflection chart in accordance with disclosed embodiments.
  • FIG. 1 shows a skid steer loader 100 having a vibratory roller implement or attachment 200 .
  • Skid steer loader 100 has numerous components which are well known in the art, and which are not described here. Discussions of such common features can be found, for example, in U.S. Pat. Nos. 6,910,731, 6,866,466, and 6,695,568, which are all herein incorporated by reference.
  • skid steer loader 100 includes a body portion 110 and an operator compartment 120 .
  • a set of lift arms 130 is coupled to the body portion, and supports the vibratory roller 200 .
  • the vibratory roller includes, among other components, a drum 205 supported by a frame 210 .
  • Disclosed embodiments utilize an improved isolator configuration to isolate the loader 100 , and particularly the operator compartment 120 , from vibrations in the vibratory roller.
  • FIG. 2 shown is a partially exploded view of vibratory roller 200 , with the drum 205 removed to illustrate some interior components.
  • the frame 210 is coupled to loader 100 via a back plate 220 .
  • a plurality of pads 230 can be mounted to the drum and are shown in exploded format in FIG. 2 .
  • Discs 240 are welded or otherwise secured within the drum itself.
  • An eccentric weight 250 is supported by eccentric bearings, (drum bearing mounting plate 260 is shown) and allowed to rotate free from drum rotation.
  • isolators 270 having an improved configuration isolate the vibrations, associated with the dynamic force, from the frame 210 , and thus from the loader and the loader operator.
  • Isolator attachment members 265 are used to bolt or otherwise attach the isolators 270 to the drum bearing mounting plate 260 .
  • the isolators are also bolted or otherwise attached to an isolator mount 275 which is coupled to (or is part of) the frame weldment.
  • FIGS. 3-6 shown are portions of vibratory roller 200 from an end view perspective, with various components removed for illustrative purposes.
  • FIG. 3 shows the entire assembly, including the drum 205 , frame 210 , back plate 220 , and pads 230 .
  • Isolator mount 275 is shown diagrammatically, though it would be hidden behind frame 210 ordinarily.
  • FIG. 4 has part of the side frame removed, showing the isolator attachment members 265 and the isolator mount 275 , which is part of the frame weldment.
  • FIG. 5 shows the isolators 270 and the drum bearing mounting plate 260 , along with other components such as drum 205 .
  • FIG. 6 illustrates just the isolators 270 and the drum bearing mounting plate 260 .
  • FIG. 7 shown is a diagrammatic isometric view illustrating portions of the weight 250 , the drum support bearing plate 260 , the isolator attachment members 265 and the isolators 270 , etc. in further detail.
  • the drive shaft 305 transmits power from the motor 310 to the eccentric weight 250 to spin the weight to create the dynamic force of the vibratory roller.
  • the drum displaces relative to the frame by as much as 1 . 5 inches.
  • the purpose for the displacement is to more effectively isolate vibrations over a wider range of carriers, and in this case, providing isolation for small loaders.
  • the isolators 270 in accordance with disclosed embodiments provide for such a wide range of displacements, and thus provide vibration isolation for a wide range of different skid steer loader carrier models and sizes.
  • FIG. 8 shown is a diagrammatic isometric view of an isolator 270 in accordance with disclosed embodiments.
  • FIG. 8 shows some of the outer contour 805 of the isolator 270 .
  • Also shown diagrammatically is a representation of the hollow interior 810 of the isolator. Both the shapes of the outer and interior surfaces 805 and 810 of isolator 270 function to allow greater deflection, and thus greater displacements to isolate the loader from the vibratory roller.
  • the drum is mounted to the frame of the vibratory roller through the isolators.
  • the isolators are stationary relative to the frame.
  • the down force of the loader causes deflection of the isolators, and thus provides isolation of the loader and the loader operator from the vibrations of the vibratory roller.
  • variable isolators have been solid pieces of rubber, frequently of cylindrical shape, with threaded holes on each end for mounting the isolators.
  • the present vibratory rollers provide advantages over these conventional vibratory rollers by allowing a higher degree of deflection of the isolator. Both the internal and external profiles of the isolator aid in providing this higher degree of deflection. Also playing a role in providing the higher degree of deflection, while still providing the required support, is the material used in isolators 270 .
  • isolators 270 are compression molded rubber in order to achieve the desired strength and deflection.
  • variable isolator 270 from a side diagrammatic view, illustrating both the exterior 805 side surfaces and interior 810 surfaces in greater detail.
  • variable isolator 270 has a shape similar to a hyperboloid, but with a straight middle portion.
  • curved ends 905 and 910 of the exterior side surface share a common radius, but are separated by a substantially linear middle portion 920 .
  • curved portions 905 and 910 need not have the same radius of curvature.
  • This isolator design, having a hyperboloid like geometry at its end side portions, modified with a straight mid section, has been shown to provide improved isolation performance compared to conventional designs. Hollow interior 930 also aids in providing these improvements.
  • the internal shape of isolator 270 also helps to get the stiffness/flexibility that is desired.
  • the tapered aspect of the interior surface 810 where it is tapered along a draft angle, is primarily to help remove isolator 270 out of the compression mold.
  • the hollow interior in general though helps to establish the stiffness at a point to allow sufficient deflection instead of making isolator 270 too rigid.
  • Conventional variable isolators for skid steer loaders have tended to be solid, without the hollow interior. Disclosed embodiments, allow for higher degrees of deflection.
  • the hollow center also allows heat reduction, which is desirable with high frequency cycling while high deflection is experienced.
  • FIG. 10 is an illustration of the same isolator 270 shown in FIG. 9 , but with example dimensions (in inches) added for illustrative purposes.
  • FIG. 11 illustrates a shear load deflection chart for these exemplary isolators.
  • the variable rubber isolator is intended for loading in the radial direction.
  • the spring rate of the isolator allows for effective isolation throughout all approved carriers. The down forces applied by the approved carriers ranges from 500 pounds to 2500 pounds respectively.
  • FIG. 12 shows a compression load deflection chart, showing deflection in inches for particular loads in pounds under compression conditions.
  • the compression loading shown in FIG. 12 is applicable to circumstances where the loader is turning, placing the isolators in a compression mode.
  • the molding process as well as the internal and exterior profiles of the isolator allows the effective range of motion to be dramatically increased while providing superior isolation throughout a very large range of shear loads.
  • Current production vibratory roller attachments for skid steer loaders utilize isolators that are sized for only the largest approved skid steer loaders.
  • the variable isolators effectively dampen the vibration created by the vibratory roller throughout all approved loader sizes without overloading the isolators.
  • the effective spring rate of the isolators in shear is, for example, 720 pounds per inch, providing improved performance.

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  • Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • General Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Vibration Prevention Devices (AREA)
US12/578,999 2008-10-14 2009-10-14 Skid Steer Loaders with Variable Isolation on Vibratory Roller Abandoned US20100098521A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/578,999 US20100098521A1 (en) 2008-10-14 2009-10-14 Skid Steer Loaders with Variable Isolation on Vibratory Roller

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10518308P 2008-10-14 2008-10-14
US12/578,999 US20100098521A1 (en) 2008-10-14 2009-10-14 Skid Steer Loaders with Variable Isolation on Vibratory Roller

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US20100098521A1 true US20100098521A1 (en) 2010-04-22

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Country Status (5)

Country Link
US (1) US20100098521A1 (fr)
EP (1) EP2350397A1 (fr)
CN (1) CN102187037A (fr)
CA (1) CA2739073A1 (fr)
WO (1) WO2010045316A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9200225B2 (en) 2010-08-03 2015-12-01 Suncoke Technology And Development Llc. Method and apparatus for compacting coal for a coal coking process
US9915040B2 (en) * 2016-04-21 2018-03-13 Hamm Ag Soil compactor
US11326323B2 (en) 2020-02-11 2022-05-10 Bernard E. Wielenberg Dirt contouring and grading device
US11459711B2 (en) * 2018-12-17 2022-10-04 Hamm Ag Soil processing machine
US11519138B2 (en) * 2018-12-17 2022-12-06 Hamm Ag Soil processing machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2022200763B1 (en) * 2021-02-05 2022-05-19 Bridge Design & Construct Pty Ltd Compactor and roller drum therefore

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US2893665A (en) * 1953-04-25 1959-07-07 Luxembourg Brev Participations Resilient suspension devices
US3195429A (en) * 1962-05-07 1965-07-20 Stothert & Pitt Ltd Vibratory roller having improved driving means
US3623407A (en) * 1969-11-21 1971-11-30 Ingersoll Rand Co Vibratory compaction roller
US3668983A (en) * 1970-05-18 1972-06-13 Domenico Domenighetti Vibrations generator with multiple shafts in series,especially for vibrating tamping means
US3724342A (en) * 1971-03-10 1973-04-03 Caron Compactor Co Compaction wheels for earth tampers
US3948500A (en) * 1973-07-18 1976-04-06 Pneumatiques Caoutchouc Manufacture Et Plastiques Kleber-Colombes Shock absorbers for mooring guards
US4098344A (en) * 1976-10-07 1978-07-04 Victor Ray Johnson Earthworking implement
US4362431A (en) * 1981-05-14 1982-12-07 Caterpillar Tractor Co. Vibrating apparatus for vibratory compactors
US4411081A (en) * 1982-01-15 1983-10-25 King Reginald D Trench compactor having a vibratory sheepsfoot assembly
US4577995A (en) * 1983-04-07 1986-03-25 Sakai Heavy Industries Ltd. Mechanism for generating vibrations for a ground compacting machine
US4632599A (en) * 1983-07-26 1986-12-30 Sakaijuhkogyo Kabushiki Kaisha Roller drum of a soil compacting machine
US4901486A (en) * 1987-03-06 1990-02-20 Kajima Corporation Elasto-plastic damper
US5017328A (en) * 1989-05-04 1991-05-21 Mazurek John D Vibration dampening motor mount
US5062228A (en) * 1990-07-02 1991-11-05 M-B-W Inc. Compactor and blade attachment for loader
US5121905A (en) * 1990-09-06 1992-06-16 Karman Rubber Company Resilient mount
US5140257A (en) * 1984-06-22 1992-08-18 Davis Murray W System for rating electric power transmission lines and equipment
US5318282A (en) * 1991-06-14 1994-06-07 Stop-Choc Schwingungstechnik Gmbh & Co. Vibration damper
US5336019A (en) * 1993-05-10 1994-08-09 Hollon Edmund D Uniform compaction of asphalt concrete
US5390495A (en) * 1991-04-15 1995-02-21 Poclain Hydraulics Assembly of a hydraulic motor and of a brake and compactor applying same
US5397198A (en) * 1993-07-27 1995-03-14 Caterpillar Paving Products Inc. Vibratory compactor having vibrationally tuned frame
US5716162A (en) * 1995-12-28 1998-02-10 Lord Corporation Dual-stage mounting system for vibratory compactor drum
US5788408A (en) * 1995-07-19 1998-08-04 Sakai Heavy Industries, Ltd. Vibratory pneumatic tire roller
US5791637A (en) * 1996-01-11 1998-08-11 Iso Dynamics, Inc. Energy absorbing compression spring body and method of making the same
US6551020B2 (en) * 2001-07-24 2003-04-22 Caterpillar Paving Products Inc. Vibratory mechanism
US20030082002A1 (en) * 2001-10-31 2003-05-01 Potts Dean R. Variable vibratory mechanism
US20030118401A1 (en) * 2001-12-20 2003-06-26 Magee Kevin J. Suspension arrangement for a compacting work machine
US20040114998A1 (en) * 2002-12-17 2004-06-17 Magee Kevin J. Split drum for a compacting work machine
US6929421B2 (en) * 2002-12-20 2005-08-16 Caterpillar Paving Products Inc. Vibratory mechanism and method for lubricating the same

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JPS51123606U (fr) * 1975-03-27 1976-10-06
DE19711649A1 (de) * 1997-03-20 1998-09-24 Lobbe Xenex Gmbh Verdichtungsvorrichtung
CN2703038Y (zh) * 2004-03-31 2005-06-01 朱远华 具有挖掘机构的装载机
CN101319508A (zh) * 2007-06-08 2008-12-10 沈阳军区司令部工程科研设计院 多功能工程设备中的液压冲击振动系统

Patent Citations (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2893665A (en) * 1953-04-25 1959-07-07 Luxembourg Brev Participations Resilient suspension devices
US3195429A (en) * 1962-05-07 1965-07-20 Stothert & Pitt Ltd Vibratory roller having improved driving means
US3623407A (en) * 1969-11-21 1971-11-30 Ingersoll Rand Co Vibratory compaction roller
US3668983A (en) * 1970-05-18 1972-06-13 Domenico Domenighetti Vibrations generator with multiple shafts in series,especially for vibrating tamping means
US3724342A (en) * 1971-03-10 1973-04-03 Caron Compactor Co Compaction wheels for earth tampers
US3948500A (en) * 1973-07-18 1976-04-06 Pneumatiques Caoutchouc Manufacture Et Plastiques Kleber-Colombes Shock absorbers for mooring guards
US4098344A (en) * 1976-10-07 1978-07-04 Victor Ray Johnson Earthworking implement
US4362431A (en) * 1981-05-14 1982-12-07 Caterpillar Tractor Co. Vibrating apparatus for vibratory compactors
US4411081A (en) * 1982-01-15 1983-10-25 King Reginald D Trench compactor having a vibratory sheepsfoot assembly
US4577995A (en) * 1983-04-07 1986-03-25 Sakai Heavy Industries Ltd. Mechanism for generating vibrations for a ground compacting machine
US4632599A (en) * 1983-07-26 1986-12-30 Sakaijuhkogyo Kabushiki Kaisha Roller drum of a soil compacting machine
US5140257A (en) * 1984-06-22 1992-08-18 Davis Murray W System for rating electric power transmission lines and equipment
US4901486A (en) * 1987-03-06 1990-02-20 Kajima Corporation Elasto-plastic damper
US5017328A (en) * 1989-05-04 1991-05-21 Mazurek John D Vibration dampening motor mount
US5062228A (en) * 1990-07-02 1991-11-05 M-B-W Inc. Compactor and blade attachment for loader
US5121905A (en) * 1990-09-06 1992-06-16 Karman Rubber Company Resilient mount
US5390495A (en) * 1991-04-15 1995-02-21 Poclain Hydraulics Assembly of a hydraulic motor and of a brake and compactor applying same
US5318282A (en) * 1991-06-14 1994-06-07 Stop-Choc Schwingungstechnik Gmbh & Co. Vibration damper
US5336019A (en) * 1993-05-10 1994-08-09 Hollon Edmund D Uniform compaction of asphalt concrete
US5397198A (en) * 1993-07-27 1995-03-14 Caterpillar Paving Products Inc. Vibratory compactor having vibrationally tuned frame
US5788408A (en) * 1995-07-19 1998-08-04 Sakai Heavy Industries, Ltd. Vibratory pneumatic tire roller
US5716162A (en) * 1995-12-28 1998-02-10 Lord Corporation Dual-stage mounting system for vibratory compactor drum
US5791637A (en) * 1996-01-11 1998-08-11 Iso Dynamics, Inc. Energy absorbing compression spring body and method of making the same
US6551020B2 (en) * 2001-07-24 2003-04-22 Caterpillar Paving Products Inc. Vibratory mechanism
US20030082002A1 (en) * 2001-10-31 2003-05-01 Potts Dean R. Variable vibratory mechanism
US20030118401A1 (en) * 2001-12-20 2003-06-26 Magee Kevin J. Suspension arrangement for a compacting work machine
US20040114998A1 (en) * 2002-12-17 2004-06-17 Magee Kevin J. Split drum for a compacting work machine
US6929421B2 (en) * 2002-12-20 2005-08-16 Caterpillar Paving Products Inc. Vibratory mechanism and method for lubricating the same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9200225B2 (en) 2010-08-03 2015-12-01 Suncoke Technology And Development Llc. Method and apparatus for compacting coal for a coal coking process
US9915040B2 (en) * 2016-04-21 2018-03-13 Hamm Ag Soil compactor
US11459711B2 (en) * 2018-12-17 2022-10-04 Hamm Ag Soil processing machine
US11519138B2 (en) * 2018-12-17 2022-12-06 Hamm Ag Soil processing machine
US11326323B2 (en) 2020-02-11 2022-05-10 Bernard E. Wielenberg Dirt contouring and grading device

Also Published As

Publication number Publication date
EP2350397A1 (fr) 2011-08-03
CN102187037A (zh) 2011-09-14
CA2739073A1 (fr) 2010-04-22
WO2010045316A1 (fr) 2010-04-22

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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KARTAL, AHMET;WIELAND, CARL JAMES;SIGNING DATES FROM 20091027 TO 20091222;REEL/FRAME:023688/0823

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Effective date: 20120808

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