US3786953A - Loader linkage - Google Patents

Loader linkage Download PDF

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Publication number
US3786953A
US3786953A US00307054A US3786953DA US3786953A US 3786953 A US3786953 A US 3786953A US 00307054 A US00307054 A US 00307054A US 3786953D A US3786953D A US 3786953DA US 3786953 A US3786953 A US 3786953A
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US
United States
Prior art keywords
boom
pivotally connected
bucket
links
transverse axis
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
US00307054A
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English (en)
Inventor
R Crum
I Patel
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.)
Fiat Allis Europe SpA
Allis Chalmers Corp
Original Assignee
Allis Chalmers Corp
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 Allis Chalmers Corp filed Critical Allis Chalmers Corp
Application granted granted Critical
Publication of US3786953A publication Critical patent/US3786953A/en
Assigned to FIATALLIS EUROPE S.P.A. reassignment FIATALLIS EUROPE S.P.A. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: FIATALLIS NORTH AMERICA, INC., A DE CORP
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
    • 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
    • E02F3/34—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 bucket-arms, i.e. a pair of arms, e.g. manufacturing processes, form, geometry, material of bucket-arms directly pivoted on the frames of tractors or self-propelled machines
    • E02F3/3405—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 bucket-arms, i.e. a pair of arms, e.g. manufacturing processes, form, geometry, material of bucket-arms directly pivoted on the frames of tractors or self-propelled machines and comprising an additional linkage mechanism
    • E02F3/3411—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 bucket-arms, i.e. a pair of arms, e.g. manufacturing processes, form, geometry, material of bucket-arms directly pivoted on the frames of tractors or self-propelled machines and comprising an additional linkage mechanism of the Z-type

Definitions

  • ABSTRACT control linkage also includes a bucket operating jack having its front rod end pivotally connected to the upper end of the lever and its rear cylinder end pivotally connected to a special linkage.
  • the special linkage includes a pair of pivotally interconnected links, one of which is pivotally connected to the boom and the other of which is pivotally connected to the tractor frame at a point spaced forwardly of the pivot connection between the boom and the frame.
  • the special linkage to which the cylinder end of the bucket operating jack is connected causes the bucket to automatically retract as the boom is raised through an initial angle toward its level position and then will cause the bucket to pivot forwardly relative to the boom to maintain the bucket in a proper material retaining altitude in relation to the ground.
  • the various components of the bucket operating linkage are in line with the longitudinal vertical plane of the boom for ideal component stress distribution.
  • the bucket is retracted by introduction of hydraulic fluid to the cylinder end of the dumping jack whereby the greatest possible breakout force is achieved by the jack.
  • the rod end of the hydraulic jack is pressurized to dump the bucket thus giving the shortest possible dumping time.
  • the connections between the bucket operating linkage and the frame of the tractor are relatively low thereby affording good operator visibility and desirable loader frame stress distribution.
  • the present invention provides a loader linkage which achieves a number of desirable objectives, these being:
  • the bucket dumping cylinders are positioned so that the closed end of the cylinder is pressurized to retract the bucket thereby providing the greatest possible breakout force for loading the bucket, and the rod end of the cylinder is pressurized to dump the bucket thereby providing the fastest possible dumping;
  • a unique linkage is utilized to mount the cylinder end of the dump jack whereby the bucket will automatically pivot on the boom to maintain a relatively level position so that the operator does not have to operate the bucket control valve as the boom is raised. Also, a dirt bank can be scraped by the bucket with greater ease and the center of gravity of the bucket load with the bucket fully retracted is relatively close to the tractor thereby aiding in unit stability;
  • the bucket tilt linkage consists of in line components thereby providing the most desirable component stress distribution
  • FIG. 1 is a side view of a tractor loader incorporating the present invention
  • FIG. 2 is a top view of the loader linkage shown in FIG. 1 with parts broken away for illustration purposes and
  • FIG. 3 is a side view of the tractor loader shown in FIG. 1 wherein the loader linkage has been raised to an elevated position.
  • the loader linkage of the present invention is mounted on a crawler tractor 11 having a frame 12 which includes an upstanding support 13 at each lateral side of the tractor.
  • the tractor 11 is supported on and propelled by an endless track running gear 14 of conventional construction.
  • the loader linkage includes a boom 16 pivotally mounted at its rear end to the support 13 of the tractor frame 12 by a transverse pivot pin 17 on a transverse axis 18.
  • a bucket 19 is pivotally connected at its lower rear portion to the front end of the boom 16 by a pivot pin 21 on a transverse axis 22.
  • Raising and lowering of the boom is achieved by operation of a double acting hydraulic jack 23 having its rod end pivotally connected to a downwardly depending part 24 of the boom 16 by a transverse pivot pin 26.
  • the cylinder 27 of the jack 23 is secured to the frame 12 by a trunnion 28 on a transverse pivot axis 19.
  • a lever structure 31 is connected intermediate its opposite ends to an upstanding part 32 on the boom 16 by a pivot pin 33 for pivotal movement about a transverse axis 34.
  • the lever structure 31 includes a pair of levers 36, 37.
  • the upper ends of the levers 36, 37 are pivotally connected to a rod 38 of an expansible and contractible strut in the form of a double acting hydraulic jack 39 by a transverse pin 41.
  • the opposite ends of the levers 36, 37, disposed at opposite sides of the boom 16, are pivotally connected to a pair of dump links 42, 43 by pivot pins 44, 46 respectively.
  • the corresponding forward ends of the dump links 42, 43 are pivotally connected to the upper rear portion of the bucket 19 by a transverse pivot pin 47.
  • the cylinder 51 of the jack 39 is pivotally connected to the upper ends of connecting links 52, 57 and reversing links 53, 58 by a transverse pivot pin 54 for swinging movement about a common transverse axis 56.
  • the bottom ends of links 52 and 57 are pivotally connected to the boom 16 by a transverse pivot pin 61 on a transverse pivot axis 62.
  • reversing links 53, 58 are pivotally connected to the support 13 by a pair of transverse pins 66, 67 which are aligned on a transverse axis 68 disposed forwardly and above the transverse axis 18 on which the boom 16 is mounted on the frame 12 of the tractor.
  • the bucket 19 has been loaded with material and the bucket rolled back on its axis 22 to a position preparatory to raising the bucket.
  • the bucket 19 has been elevated by extension of the lift jack 23 and consequent swinging movement of the boom 16 to the position shown.
  • the bucket dumping jack 39 has not been actuated; however, it will be noted that the bucket control linkage comprising the connecting links 52, 57 and reversing links 53, 58 have swung the jack pivot axis 56 rearwardly to automatically pivot the bucket 19 counterclockwise about its axis 22 as the boom 16 is raised.
  • the links 52, 57, 53, 58 will cause the bucket to swing substantially in unison with the boom.
  • the bucket control linkage that is links 52, 57, 53, 58 will begin to pivot the bucket counterclockwise so as to keep the bucket in its illustrated material retaining position.
  • the bucket control linkage continues to force the bucket counterclockwise relative to the boom as the boom is swung to its raised position shown in FIG. 3.
  • the illustrated linkage causes the bucket to scrape the dirt bank with greater ease and keeps the center of gravity as close as possible to the tractor during initial upward movement of the boom.
  • the loader linkage components By placing the loader linkage components in line, that is in a vertical longitudinal plane, the component stresses are minimized and the most effective application of hydraulic jack forces is achieved.
  • the linkage has a relatively low silhouette thus facilitating operator visibility and minimizing tractor frame stress problems.
  • the various features of the present invention contribute to a loader having desirable loading and handling characteristics.
  • the novel loader linkage of this invention is comprised of components which are relatively easy and inexpensive to manufacture, thus providing the user with the advantages of an efficient tool at a reasonable cost.
  • a longitudinally extending boom pivotally connected to said frame on a first transverse axis
  • a bucket pivotallyconnected at its lower rear portion to the front end of said boom on a second transverse axis
  • a lift jack operatively interposed between said frame and said boom
  • a lever structure pivotally connected intermediate its upper and lower ends to an intermediate part of said boom on a third transverse axis
  • a dump link structure pivotally connected at one of its opposite ends to the upper rear portion of said bucket and pivotally connected at the other of its opposite ends to said lower end of said lever structure
  • an expansible and contractible strut pivotally connected at one of its opposite ends to said upper end of said lever structure
  • linkage means interconnecting said strut, frame and boom including a first link pivotally connected at one of its opposite ends to said boom on a fourth transverse axis disposed forwardly of said first transverse axis
  • first pivot means pivotally interconnecting said first and second links on a transverse axis spaced from said fourth and fifth axes, and
  • second pivot means pivotally connecting the other end of said strut to one of said first and second links on a transverse axis spaced from said fourth and fifth axes whereby said strut is in overlying relation to said boom.
  • transverse axis interconnecting said first and second links is the same transverse axis on which said strut and said one of said links are pivotally connected.
  • transverse axis interconnecting said first and second links is the same transverse axis on which said strut and said one of said links are pivotally connected.
  • lever structure includes levers on transversely opposite sides of said boom pivotally connected to the latter on said third axis and wherein said dump link structure includes dump links on transversely opposite sides of said boom having their corresponding opposite ends pivotally connected to said bucket and levers.
  • said linkage means includes a pair of first links on opposite transverse sides of said boom pivotally connected to said boom on said fourth axis,
  • said first pivot means pivotally interconnects said pairs of links
  • said second pivot means pivotally connects the other end of said strut to one of said pairs of first and second links.
  • first and second pivot means comprise a transverse pivot pin.
  • said strut includes a double acting hydraulic jack having its rod end pivotally connected to said upper end of said lever structure and having its cylinder end pivotally connected by said second pivot means to one of said first and second links.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Shovels (AREA)
  • Operation Control Of Excavators (AREA)
  • Catching Or Destruction (AREA)
  • Special Spraying Apparatus (AREA)
  • Forklifts And Lifting Vehicles (AREA)
US00307054A 1972-11-16 1972-11-16 Loader linkage Expired - Lifetime US3786953A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US30705472A 1972-11-16 1972-11-16

Publications (1)

Publication Number Publication Date
US3786953A true US3786953A (en) 1974-01-22

Family

ID=23188037

Family Applications (1)

Application Number Title Priority Date Filing Date
US00307054A Expired - Lifetime US3786953A (en) 1972-11-16 1972-11-16 Loader linkage

Country Status (8)

Country Link
US (1) US3786953A (enrdf_load_html_response)
JP (1) JPS4982106A (enrdf_load_html_response)
BR (1) BR7308997D0 (enrdf_load_html_response)
CA (1) CA993836A (enrdf_load_html_response)
DE (1) DE2357365B2 (enrdf_load_html_response)
ES (1) ES420579A1 (enrdf_load_html_response)
GB (1) GB1449502A (enrdf_load_html_response)
IT (1) IT996448B (enrdf_load_html_response)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4029226A (en) * 1976-04-12 1977-06-14 J. I. Case Company Linkage support system for material handling unit
US4046026A (en) * 1975-01-08 1977-09-06 Sveska Hymas Aktiebolag Linkage and motion system, especially for accomplishing a swinging movement in equipment such as buckets for power shovels and the like
US4344734A (en) * 1980-05-23 1982-08-17 J. I. Case Company Self-leveling bucket linkage
US4364705A (en) * 1980-07-07 1982-12-21 J. I. Case Company Loader mechanism
FR2774407A1 (fr) * 1998-01-30 1999-08-06 Caterpillar Inc Bras de levage allonge et a stabilite accrue pour un engin
US6699000B2 (en) * 2000-05-10 2004-03-02 J. C. Bamford Excavators Limited Machine having a working arm
FR3007011A1 (fr) * 2013-06-17 2014-12-19 Comilev Plateforme elevatrice de personnel integrant une tourelle evolutive

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2948480C2 (de) * 1979-12-01 1983-12-22 Hanomag GmbH, 3000 Hannover Auslegergestänge für einen Schaufellader
SE462624B (sv) * 1988-12-06 1990-07-30 Vme Ind Sweden Ab Laenkarmsystem vid lastmaskiner
ES2197770B1 (es) * 2001-09-17 2005-06-01 Automoviles Utilitarios, S.A. Vehiculo provisto de cuchara de autocarga.

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3211310A (en) * 1962-07-09 1965-10-12 Caterpillar Tractor Co Trip mechanism for automatically positioning vehicle loaders
US3464574A (en) * 1968-01-08 1969-09-02 Caterpillar Tractor Co Loader lift linkage

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3211310A (en) * 1962-07-09 1965-10-12 Caterpillar Tractor Co Trip mechanism for automatically positioning vehicle loaders
US3464574A (en) * 1968-01-08 1969-09-02 Caterpillar Tractor Co Loader lift linkage

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4046026A (en) * 1975-01-08 1977-09-06 Sveska Hymas Aktiebolag Linkage and motion system, especially for accomplishing a swinging movement in equipment such as buckets for power shovels and the like
US4029226A (en) * 1976-04-12 1977-06-14 J. I. Case Company Linkage support system for material handling unit
US4344734A (en) * 1980-05-23 1982-08-17 J. I. Case Company Self-leveling bucket linkage
US4364705A (en) * 1980-07-07 1982-12-21 J. I. Case Company Loader mechanism
FR2774407A1 (fr) * 1998-01-30 1999-08-06 Caterpillar Inc Bras de levage allonge et a stabilite accrue pour un engin
US6699000B2 (en) * 2000-05-10 2004-03-02 J. C. Bamford Excavators Limited Machine having a working arm
FR3007011A1 (fr) * 2013-06-17 2014-12-19 Comilev Plateforme elevatrice de personnel integrant une tourelle evolutive

Also Published As

Publication number Publication date
CA993836A (en) 1976-07-27
DE2357365C3 (enrdf_load_html_response) 1979-03-22
GB1449502A (en) 1976-09-15
IT996448B (it) 1975-12-10
JPS4982106A (enrdf_load_html_response) 1974-08-07
DE2357365B2 (de) 1978-07-20
BR7308997D0 (pt) 1974-08-22
DE2357365A1 (de) 1974-05-22
ES420579A1 (es) 1976-05-01

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Legal Events

Date Code Title Description
AS Assignment

Owner name: FIATALLIS EUROPE S.P.A., ZONA INDUSTRIALE SURBO, I

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:FIATALLIS NORTH AMERICA, INC., A DE CORP;REEL/FRAME:004389/0443

Effective date: 19850228