US3503456A - Mounting linkage for rippers - Google Patents

Mounting linkage for rippers Download PDF

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Publication number
US3503456A
US3503456A US665051A US3503456DA US3503456A US 3503456 A US3503456 A US 3503456A US 665051 A US665051 A US 665051A US 3503456D A US3503456D A US 3503456DA US 3503456 A US3503456 A US 3503456A
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US
United States
Prior art keywords
linkage
mounting
ripper
parallelogram
tractor
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.)
Expired - Lifetime
Application number
US665051A
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English (en)
Inventor
Donald J Larson
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.)
Caterpillar Inc
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Caterpillar Tractor Co
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Filing date
Publication date
Application filed by Caterpillar Tractor Co filed Critical Caterpillar Tractor Co
Application granted granted Critical
Publication of US3503456A publication Critical patent/US3503456A/en
Assigned to CATERPILLAR INC., A CORP. OF DE. reassignment CATERPILLAR INC., A CORP. OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CATERPILLAR TRACTOR CO., A CORP. OF CALIF.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F5/00—Dredgers or soil-shifting machines for special purposes
    • E02F5/30—Auxiliary apparatus, e.g. for thawing, cracking, blowing-up, or other preparatory treatment of the soil
    • E02F5/32—Rippers
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
    • A01B13/00—Ploughs or like machines for special purposes ; Ditch diggers, trench ploughs, forestry ploughs, ploughs for land or marsh reclamation
    • A01B13/08—Ploughs or like machines for special purposes ; Ditch diggers, trench ploughs, forestry ploughs, ploughs for land or marsh reclamation for working subsoil

Definitions

  • the other kind of linkage is a parallelogramtype linkage which maintains the ripper shank at a constant angle while its depth of penetration is varied through tipping or lowering one end of the parallelogram structure. See U.S. Patent 3,116,797 issued to Launder et al. showing the parallelogram-type linkage.
  • the hinge-type mounting is preferred where it is necessary to rip close to a vertical wall or bank since it allows the tractor to swing the tip of the ripper into the bank or wall as it is lowered.
  • this type of arcuate penetration is not possible with the parallelogram-type linkage since the ripper shank remains at a constant angle when the ripper penetrates.
  • the hinge-type mounting is the simplest and is stronger, it has the disadvantage of a constantly varying angle in the ripper shank as the depth of penetration is changed.
  • the hinge-type linkage may limit penetration or reduce output and often increases ripper wear.
  • a parallelogram-type linkage is the most preferred under the majority of conditions, since it keeps the ripper shank angle constant, regardless of the depth of penetration improving efiiciency.
  • the tractors forward motion may aid penetration of the ripper tip at any depth of penetration which is not possible with a hinged-type ripper linkage at all penetration depths.
  • the above problem can be solved by fabricating a ripper mounting linkage combining the features of both the hinged-type linkage and a parallelogram-type linkage.
  • the invention accomplishes the objective by including in a parallelogram-type linkage adjustable means whereby one arm or side of the parallelogram-type linkage may be varied and a separate control means to raise and lower one end of the linkage.
  • the latter control means is a depth control hydraulic actuator which operates between the tractor mounting brackets and the lower arms of the linkage.
  • the above results are achieved by providing spaced mounting brackets across the rear portion of a tractor with the tool beam spaced rearwardly thereto and connected to the mounting brackets through parallelogram-type linkages, one arm or side of which is variable in length.
  • the parallelogram-type linkage is duplicated on opposite sides of the tractor to provide structural rigidity in the linkage from the resulting box-like linkage structure.
  • the tool beam is coupled to the spaced mounting brackets on the tractor by means of lower links which are fixed-lengths members and are pivotally connected at each end between the tool beam and the spaced mounting bracket on the rear of the tractor, forming a draw bar structure.
  • the tool beam includes a beam bracket, which is fixedly secured thereto and forms an upright side or arm of the parallelogramtype linkage.
  • Link hydraulic actuators forming the upper horizontal side or arm of the linkage extend between the top of the beam brackets and the top of the mounting bracket to complete the parallelogram.
  • a true parallelogram is formed only when the link hydraulic actuators are exactly the same length as the lower links.
  • intermediate lengths of the link hydraulic actuators provide a modified linkage structure which increases the available configuration possible with the tool beam.
  • the height of the tool beam above the ground is controlled by depth hydraulic actuators which are pivotally connected between the fixed length lower links and the mounting brackets on the rear of the tractor so that the tool bar is raised or lowered by operation of these jacks.
  • the ripper shanks are connected onto the tool beam by any suitable means and more conventionally are arranged so that they can be adjusted up or down relative to the tool beam by pinning the shanks in the beam at selected heights.
  • FIG. 1 is an elevation of the ripper mounting constructed according to this invention with broken lines showing several operating positions of the ripper shank;
  • FIG. 2 is an elevation of the ripper mounting showing the ripper shank in an elevated or raised position
  • FIG. 3 is a perspective of the quadrilateral linkages shown in FIGS. 1 and 2'.
  • a ripper mounting linkage is shown connected to the rear portion of a track type tractor 10.
  • the novel mounting linkage uses a pair of vertical mounting brackets 11 which are spaced from one another across the back of the tractor and attached thereto by a plurality of bolts 12. These mounting brackets form one vertical side or arm of a parallelogram-type linkage.
  • a tool beam 13 which is spaced rearwardly from the mounting brackets is provided with a pair of spaced vertical beam brackets 14, fixedly mounted to the tool beam.
  • the lower links 15 are of a fixed length and extend from the base of each beam bracket 14 to the base of each mounting bracket 11.
  • Lower forked ends 16 and 17 are provided on the ends of these links and are received over the bottom ends of brackets 14 and 11, respectively, so they can pivotally be pinned thereto with pivot pins 22 and 23.
  • Using a pair of spaced lower links across the rear of the tractor stablize the tool beam and allow the main pulling loads to be carried between the tractor and the tool beam, to be carried by the rigid lower link structure, which functions as a draw bar.
  • the pivot connection of the lower links to the beam brackets should be adjacent to the longitudinal axis of the tool beam.
  • a pair of link hydraulic actuators 24 are connected between the upper ends of beam brackets 14 and mounting brackets 11 generally parallel to the lower links to complete the parallelogram-type linkage.
  • the upper ends of both the beam brackets are bifurcated to receive a rod end 25 of the link actuators and cylinder ends 26 are received in similar bifurcated ends on the mounting brackets.
  • Pins 27 and 28 are used to secure the link actuators in the respective bifurcation.
  • a pair of depth actuators 31 are connected between a lug 32 near the outboard end arm of each lower link 15 and an ear 11a on central portion of the mounting bracket 11, being secured thereto at opposite ends with pins 33 and 34, respectively. Actuation of the depth actuator on both sides of the tractor will raise or lower the outboard ends of the lower links which carry the tool beam.
  • the link actuators Assuming for a moment that the link actuators have been adjusted to give a true parallelogram, actuation of the depth jacks will lift or lower the ripper shank and tip 35 in a conventional manner. Once the depth has been selected, the link actuators can be operated reduced in length to move the ripper tip to the position indicated by broken line 36 or extended to move the ripper tip to the position shown by broken line 37. It is important to note that when the angle of the ripper is changed in this linkage, the depth of the tip remains essentially constant, being positively controlled by depth actuators 31.
  • the link actuators 41 are adjusted so that their effective lengths are the same as those of the lower links 15. If desired, for the convenience of the operator, indices may be provided on the link actuators to indicate when this condition exists.
  • depth actuators 31 can be used to raise or lower the tool beam as desired in the same manner as a prior art parallelogram-type linkage. If the ripper is raised as shown in FIG. 2, the link actuator may be utilized to increase the ground clearance which allows the structure to be relatively compact and still provide adequate ground clearance.
  • the ripper tip may be swung into a wall or slope much in the same way as a hinge-type linkage and then changed to operate as a parallelogram-type linkage as the tractor moves away from the wall or bank.
  • a ripper mounting linkage for attachment to the rear of a tractor, said linkage comprising a pair of spaced apart vertical mounting brackets with means to attach them to the rear of a tractor, each said mounting brackets having an upper pivot, a lower pivot and a central pivot,
  • each of said vertical beam brackets having an upper pivot and a lower pivot

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Soil Sciences (AREA)
  • Environmental Sciences (AREA)
  • Axle Suspensions And Sidecars For Cycles (AREA)
  • Prostheses (AREA)
  • Handcart (AREA)
  • Agricultural Machines (AREA)
US665051A 1967-09-01 1967-09-01 Mounting linkage for rippers Expired - Lifetime US3503456A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US66505167A 1967-09-01 1967-09-01

Publications (1)

Publication Number Publication Date
US3503456A true US3503456A (en) 1970-03-31

Family

ID=24668507

Family Applications (1)

Application Number Title Priority Date Filing Date
US665051A Expired - Lifetime US3503456A (en) 1967-09-01 1967-09-01 Mounting linkage for rippers

Country Status (4)

Country Link
US (1) US3503456A (enrdf_load_stackoverflow)
DE (1) DE1784637C3 (enrdf_load_stackoverflow)
FR (1) FR1578619A (enrdf_load_stackoverflow)
GB (1) GB1232647A (enrdf_load_stackoverflow)

Cited By (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3631931A (en) * 1969-12-12 1972-01-04 Case Co J I Bulldozer
US3647003A (en) * 1970-03-06 1972-03-07 Archie R Gagne Slit trenching machine and cable layer
US3807508A (en) * 1973-01-26 1974-04-30 L Kelley Variable ripper plow shank assembly
US3887015A (en) * 1973-04-30 1975-06-03 Leon O Kelley Convertible ripper and gouger and toe trimmer
US3901328A (en) * 1974-10-07 1975-08-26 Caterpillar Tractor Co Implement mounting arrangement for earthmoving equipment
US4013129A (en) * 1975-09-24 1977-03-22 International Harvester Company Ripper for attachment to tractor
US4031964A (en) * 1974-02-01 1977-06-28 Kabushiki Kaisha Komatsu Seisakusho Automatic control system controlling a ripper used on a construction equipment
US4044838A (en) * 1975-04-21 1977-08-30 American Tractor Equipment Corporation Automatic control for ripper tool
US4059283A (en) * 1972-11-22 1977-11-22 Fiat Trattori S.P.A. Three-point tractor linkage
US4174757A (en) * 1977-10-03 1979-11-20 Caterpillar Tractor Co. Material ripping vehicle
US4204578A (en) * 1978-05-26 1980-05-27 Caterpillar Tractor Co. Ground-engaging implement assembly
FR2472342A1 (enrdf_load_stackoverflow) * 1979-04-24 1981-07-03 Fiat Allis Macch Movi
WO1982000076A1 (en) * 1980-07-01 1982-01-21 Winker B Convertible vibrating ripper
US4313504A (en) * 1979-08-13 1982-02-02 Caterpillar Tractor Co. Tandem ripper assembly
US4321970A (en) * 1980-08-07 1982-03-30 Thigpen James L Ripper apparatus
US4351397A (en) * 1980-03-10 1982-09-28 International Harvester Co. Vibrating ripper
US4355475A (en) * 1980-10-28 1982-10-26 Harkness Travis O Root grubbing plow
WO1982003525A1 (en) * 1979-08-13 1982-10-28 Robert L Fischer Tandem ripper assembly
US4356644A (en) * 1980-10-28 1982-11-02 Harkness Travis O Root grubbing plow
US4453600A (en) * 1982-08-02 1984-06-12 Thigpen James L Signal shank parallel ripper apparatus
US4466491A (en) * 1982-06-30 1984-08-21 Tower Douglass G Apparatus for removing rocks and objects
US4478289A (en) * 1981-03-23 1984-10-23 Weyerhaeuser Company Side mounted soil ripping mechanism
US4618005A (en) * 1984-08-20 1986-10-21 Tower Douglass G Orientable ripper
US4817731A (en) * 1987-07-01 1989-04-04 Komatsu Dresser Company Ripper mechanism
US4991659A (en) * 1990-04-23 1991-02-12 Caterpillar Inc. Ripper assembly with pitch control and integral frame and push block
US20050189125A1 (en) * 2003-11-21 2005-09-01 Komatsu Ltd. Ripping device for an earthmoving machine
WO2007012141A1 (en) * 2005-07-29 2007-02-01 Karrod Pty Ltd Scarifier
US20080202778A1 (en) * 2007-02-26 2008-08-28 Gregory Dennis Cahill Tool
EA011070B1 (ru) * 2005-11-04 2008-12-30 Амазонен-Верке Х. Драйер Гмбх Унд Ко. Кг Сеялка
US20090199441A1 (en) * 2008-02-11 2009-08-13 Caterpillar Inc. High visibility ripper assembly and machine using same
US20110236140A1 (en) * 2010-03-23 2011-09-29 Sc Medinger R&D Method for compacting soil, applications of this method and devices for its implementation
WO2012036619A1 (en) * 2010-09-13 2012-03-22 Väderstad-Verken Ab Holder, cultivator means and agricultural machinery equipped with such
CN102870515A (zh) * 2012-10-11 2013-01-16 江苏圆通农机科技有限公司 一种用于深翻机械的三连杆机构
AU2013200300A1 (en) * 2005-07-29 2013-02-07 Terraform Industries Pty Ltd Scarifier
US20140182172A1 (en) * 2011-02-17 2014-07-03 Brandon L. Ritter Rock removal skid steer attachment
CN105027706A (zh) * 2015-09-15 2015-11-11 中国农业大学 一种深松铲入土角度可调式深松机
CN107371397A (zh) * 2017-09-07 2017-11-24 山东农业大学 一种可调式深松铲固定装置
WO2018148599A1 (en) 2017-02-13 2018-08-16 Agsoilworks Technology Company, Llc Improved vibrating subsoil tool
US10113300B2 (en) * 2015-03-02 2018-10-30 Komatsu Ltd. Work vehicle and ripper device
US20210251126A1 (en) * 2018-06-07 2021-08-19 Rocks Gone Pty Ltd Earth conditioning apparatus, systems & methods
US11293166B2 (en) 2017-02-13 2022-04-05 Agsoilworks Technology Company, Llc Vibrating subsoil tool
US11319692B2 (en) 2018-07-16 2022-05-03 Caterpillar Inc. Ripper shank pocket with wear inserts
US11391012B2 (en) * 2018-07-16 2022-07-19 Caterpillar Inc. Ripper shank pocket with wear inserts

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU541657B2 (en) * 1979-02-14 1985-01-17 Springer, H-W. Subsoil plough
GB8327573D0 (en) * 1983-10-14 1983-11-16 Econ Atkinson Ltd Road planing equipment
EP0222930A1 (de) * 1985-11-22 1987-05-27 Franz Kirchberger Tiefenlockerer
DE4243696C1 (de) * 1992-12-18 1994-02-10 Liba Lingener Baumaschinen Ges Grabenfräse
CN102979122B (zh) * 2012-12-03 2014-11-26 梅州市广宇建筑工程有限公司 剪刀式开槽机
DE102019122712A1 (de) * 2019-08-23 2021-02-25 Horsch Maschinen Gmbh Landwirtschaftliche Bodenbearbeitungsmaschine zur Bearbeitung von Reihenkulturen

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2722181A (en) * 1953-02-26 1955-11-01 Kent J Hash Conduit placing machine
US2747485A (en) * 1953-03-02 1956-05-29 Hester Plow Company Inc Tractor implement supporting attachment
US2886114A (en) * 1955-11-14 1959-05-12 Massey Ferguson Inc Implement adjusting mechanism
US3002574A (en) * 1956-01-26 1961-10-03 John R Padrick System and implement for deep tillage of the soil
US3116797A (en) * 1962-06-28 1964-01-07 Tooth H & L Co Controlled angle ripper attachment

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3120281A (en) * 1961-03-27 1964-02-04 Tooth H & L Co Adjustable ripper shank
GB1010489A (en) * 1963-10-21 1965-11-17 A E Harris & Son Ltd Improvements relating to sawing attachments for tractors and tractors having such attachments
US3295612A (en) * 1964-11-12 1967-01-03 Caterpillar Tractor Co Control linkage for earthworking tools

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2722181A (en) * 1953-02-26 1955-11-01 Kent J Hash Conduit placing machine
US2747485A (en) * 1953-03-02 1956-05-29 Hester Plow Company Inc Tractor implement supporting attachment
US2886114A (en) * 1955-11-14 1959-05-12 Massey Ferguson Inc Implement adjusting mechanism
US3002574A (en) * 1956-01-26 1961-10-03 John R Padrick System and implement for deep tillage of the soil
US3116797A (en) * 1962-06-28 1964-01-07 Tooth H & L Co Controlled angle ripper attachment

Cited By (49)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3631931A (en) * 1969-12-12 1972-01-04 Case Co J I Bulldozer
US3647003A (en) * 1970-03-06 1972-03-07 Archie R Gagne Slit trenching machine and cable layer
US4059283A (en) * 1972-11-22 1977-11-22 Fiat Trattori S.P.A. Three-point tractor linkage
US3807508A (en) * 1973-01-26 1974-04-30 L Kelley Variable ripper plow shank assembly
US3887015A (en) * 1973-04-30 1975-06-03 Leon O Kelley Convertible ripper and gouger and toe trimmer
US4031964A (en) * 1974-02-01 1977-06-28 Kabushiki Kaisha Komatsu Seisakusho Automatic control system controlling a ripper used on a construction equipment
US3901328A (en) * 1974-10-07 1975-08-26 Caterpillar Tractor Co Implement mounting arrangement for earthmoving equipment
US4044838A (en) * 1975-04-21 1977-08-30 American Tractor Equipment Corporation Automatic control for ripper tool
US4013129A (en) * 1975-09-24 1977-03-22 International Harvester Company Ripper for attachment to tractor
US4174757A (en) * 1977-10-03 1979-11-20 Caterpillar Tractor Co. Material ripping vehicle
US4204578A (en) * 1978-05-26 1980-05-27 Caterpillar Tractor Co. Ground-engaging implement assembly
FR2472342A1 (enrdf_load_stackoverflow) * 1979-04-24 1981-07-03 Fiat Allis Macch Movi
US4313504A (en) * 1979-08-13 1982-02-02 Caterpillar Tractor Co. Tandem ripper assembly
WO1982003525A1 (en) * 1979-08-13 1982-10-28 Robert L Fischer Tandem ripper assembly
US4351397A (en) * 1980-03-10 1982-09-28 International Harvester Co. Vibrating ripper
WO1982000076A1 (en) * 1980-07-01 1982-01-21 Winker B Convertible vibrating ripper
US4321970A (en) * 1980-08-07 1982-03-30 Thigpen James L Ripper apparatus
US4355475A (en) * 1980-10-28 1982-10-26 Harkness Travis O Root grubbing plow
US4356644A (en) * 1980-10-28 1982-11-02 Harkness Travis O Root grubbing plow
US4478289A (en) * 1981-03-23 1984-10-23 Weyerhaeuser Company Side mounted soil ripping mechanism
US4466491A (en) * 1982-06-30 1984-08-21 Tower Douglass G Apparatus for removing rocks and objects
US4453600A (en) * 1982-08-02 1984-06-12 Thigpen James L Signal shank parallel ripper apparatus
US4618005A (en) * 1984-08-20 1986-10-21 Tower Douglass G Orientable ripper
US4817731A (en) * 1987-07-01 1989-04-04 Komatsu Dresser Company Ripper mechanism
US4991659A (en) * 1990-04-23 1991-02-12 Caterpillar Inc. Ripper assembly with pitch control and integral frame and push block
US7445053B2 (en) 2003-11-21 2008-11-04 Komatsu Ltd. Ripping device for an earthmoving machine
US20050189125A1 (en) * 2003-11-21 2005-09-01 Komatsu Ltd. Ripping device for an earthmoving machine
AU2013200300A1 (en) * 2005-07-29 2013-02-07 Terraform Industries Pty Ltd Scarifier
WO2007012141A1 (en) * 2005-07-29 2007-02-01 Karrod Pty Ltd Scarifier
US20090050340A1 (en) * 2005-07-29 2009-02-26 Karrod Pty Ltd, Acn 120 643 745, As Trustee For The Mcintyre Family Trust Scarifier
EA011070B1 (ru) * 2005-11-04 2008-12-30 Амазонен-Верке Х. Драйер Гмбх Унд Ко. Кг Сеялка
US20080202778A1 (en) * 2007-02-26 2008-08-28 Gregory Dennis Cahill Tool
US20090199441A1 (en) * 2008-02-11 2009-08-13 Caterpillar Inc. High visibility ripper assembly and machine using same
US9121144B2 (en) * 2010-03-23 2015-09-01 Sc Medinger R&D Method for compacting soil, applications of this method and devices for its implementation
US20110236140A1 (en) * 2010-03-23 2011-09-29 Sc Medinger R&D Method for compacting soil, applications of this method and devices for its implementation
WO2012036619A1 (en) * 2010-09-13 2012-03-22 Väderstad-Verken Ab Holder, cultivator means and agricultural machinery equipped with such
US20140182172A1 (en) * 2011-02-17 2014-07-03 Brandon L. Ritter Rock removal skid steer attachment
CN102870515A (zh) * 2012-10-11 2013-01-16 江苏圆通农机科技有限公司 一种用于深翻机械的三连杆机构
US10113300B2 (en) * 2015-03-02 2018-10-30 Komatsu Ltd. Work vehicle and ripper device
CN105027706A (zh) * 2015-09-15 2015-11-11 中国农业大学 一种深松铲入土角度可调式深松机
CN105027706B (zh) * 2015-09-15 2016-08-24 中国农业大学 一种深松铲入土角度可调式深松机
EP3579679A4 (en) * 2017-02-13 2020-12-16 Agsoilworks Technology Company, LLC IMPROVED VIBRATING TOOL FOR THE BASEMENT
WO2018148599A1 (en) 2017-02-13 2018-08-16 Agsoilworks Technology Company, Llc Improved vibrating subsoil tool
US11293166B2 (en) 2017-02-13 2022-04-05 Agsoilworks Technology Company, Llc Vibrating subsoil tool
CN107371397A (zh) * 2017-09-07 2017-11-24 山东农业大学 一种可调式深松铲固定装置
US20210251126A1 (en) * 2018-06-07 2021-08-19 Rocks Gone Pty Ltd Earth conditioning apparatus, systems & methods
US12185648B2 (en) * 2018-06-07 2025-01-07 Rocks Gone Pty Ltd Earth conditioning apparatus, systems and methods
US11319692B2 (en) 2018-07-16 2022-05-03 Caterpillar Inc. Ripper shank pocket with wear inserts
US11391012B2 (en) * 2018-07-16 2022-07-19 Caterpillar Inc. Ripper shank pocket with wear inserts

Also Published As

Publication number Publication date
DE1784637B2 (de) 1979-06-13
DE1784637C3 (de) 1982-08-26
DE1784637A1 (de) 1971-08-26
GB1232647A (enrdf_load_stackoverflow) 1971-05-19
FR1578619A (enrdf_load_stackoverflow) 1969-08-14

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Legal Events

Date Code Title Description
AS Assignment

Owner name: CATERPILLAR INC., A CORP. OF DE.,ILLINOIS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CATERPILLAR TRACTOR CO., A CORP. OF CALIF.;REEL/FRAME:004669/0905

Effective date: 19860515

Owner name: CATERPILLAR INC., 100 N.E. ADAMS STREET, PEORIA, I

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CATERPILLAR TRACTOR CO., A CORP. OF CALIF.;REEL/FRAME:004669/0905

Effective date: 19860515