US3884378A - Lift arm assembly for loader vehicles - Google Patents

Lift arm assembly for loader vehicles Download PDF

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Publication number
US3884378A
US3884378A US408667A US40866773A US3884378A US 3884378 A US3884378 A US 3884378A US 408667 A US408667 A US 408667A US 40866773 A US40866773 A US 40866773A US 3884378 A US3884378 A US 3884378A
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US
United States
Prior art keywords
lift arm
plates
arm
lift
pins
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
US408667A
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English (en)
Inventor
Donald R Muellner
Richard J Piercy
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
Original Assignee
Caterpillar Tractor 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 Caterpillar Tractor Co filed Critical Caterpillar Tractor Co
Priority to US408667A priority Critical patent/US3884378A/en
Priority to CA207,406A priority patent/CA1006465A/en
Priority to JP10659874A priority patent/JPS5735330B2/ja
Priority to BR7599/74A priority patent/BR7407599D0/pt
Priority to BE149809A priority patent/BE821394A/xx
Application granted granted Critical
Publication of US3884378A publication Critical patent/US3884378A/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
    • 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

  • One end of the fluid cylinder is received between the lower portions of the plates and coupled thereto by pivot means.
  • the plates are in turn joined to the lift arms by a pair of removable cross pins which are transpierced through the plates and lift arms at widely spaced points along the length of the arm to distribute stress.
  • Loader vehicles and certain other forms of apparatus for manipulating bulk materials customarily have a bucket supported at one end of a pair of lift arms which are in turn pivoted to the vehicle.
  • linear fluid motors being connected between the lift arms and'the vehicle to selectively elevate and lower the bucket.
  • This construction requires that there be a pivot joint between one end of each fluid motor and the associated lift arm.
  • a U-shaped yoke is welded to one end of the rod of the fluid motor.
  • connection between the lift cylinder and lift arm has been formed by welding a bracket assembly to the lift arm.
  • the bracket extends a distance below the arm to receive a pivot axle extending transversely through the bracket and through a sleeve on the end of the fluid motor rod. If of economical size, such a weld is also an area of extreme stress concentration and is subject to the same failure problem discussed above. Further, assembly and disassembly for repairs is extremely difficult where a welded bracket is employed.
  • the present invention provides a high strength economical and readily assembled and disassembled coupling between a lift arm of a loader or the like and the fluid motor which operates the arm.
  • a pair of plates are disposed one on either side of the lift arm and each has a lower portion extending a small distance below the arm.
  • One end of the fluid motor is received between the lower portions of the plates and a pivot connection is provided therebetween.
  • the plates are secured to the lift arm itself by a pair of removable cross pins which are widely spaced apart along the length of the lift arm to distribute stress forces.
  • a pair of supplementary cross bolts extend between the two plates at the level of the lower edge of the lift arm to retain the plates together in the event that the primary load bearing cross pins should become loose.
  • the supplementary cross bolts serve a further purpose of facilitating positioning of the lift arm during assembly.
  • FIG. 1 is an elevation view of the forward portion of a loader vehicle embodying the present invention
  • FIG. 2 is a side view of a portion of the apparatus of FIG. 1 further illustrating the coupling between a lift arm and fluid motor thereof.
  • FIG. 3 is a plan view of the structure shown in FIG. 2.
  • FIG. 1 there is shown a portion of a loader vehicle 11 of the type having a bucket 12 carried at the forward end of lift arms 13.
  • the lift arms 13 which have a slight S-curvature in this particular example are coupled to the body 14 of the vehicle by a first pivot connection 16 which enables the forward end of the lift arm together with bucket 12 to be lowered whereby the bucket may receive material upon forward motion of the vehicle and which enables the lift arms and bucket to be elevated for the purpose of carrying the material to another area where the material may be dumped.
  • the bucket 12 is coupled to the forward end of the lift arms by another pivot connection 17.
  • Tilt linkage 18, including an extensible and contractible fluid operated tilt cylinder 19, is provided to enable selective pivoting of the bucket relative to the lift arms.
  • Suitable detailed construction for the loader vehicle 11, bucket 12 and tilt linkage 18 are known to the art and accordingly will not be further described.
  • lift cylinders 21 which may be extensible and contractible hydraulic fluid motors, each have a head end coupled to the body 14 of a vehicle at a pivot connection 22 and extend upwardly and forwardly therefrom towards the underside of a central portion of an associated one of the lift arms 13.
  • the coupling 23 between each lift arm I3 and lift cylinder 21 is formed in part by a pair of plates 24 of substantially triangular configuration disposed one on each side of a central portion of the associated lift arm 13. Each such plate 24 has one corner 26 extending below the level of the adjacent portion of the lift arm 13.
  • Plates 24 are arranged so that a broad edge 31 thereof extends along a sizeable portion of the length of the central section of lift arm 13 to enable a pair of widely spaced apart cross pins 32 to be transpierced through the plate and the lift arm to secure the plates and the lift arm together. This divides the stress at the point of attachment to the lift arm between spaced apart points thereon thereby reducing the risk of failure under heavy loading.
  • Cross pins 32 are preferably of the form described in copending Application Ser. No. 318,516 of Robert F. Shankwitz et al., now US. Pat. No. 3,841,771 filed Dec. 26, 1972, and entitled Tapered Hinge Pin Assembly and Removal Means.
  • Pin assemblies of this kind are provided with bolts 33 in each end which may be tightened to axially compress the assembly and thereby cause radial expansion of the end portions of the assembly which wedges the pin 3 tightly into the adjacent structure. the pin assemblies being disengageable by reverse turning of the bolts.
  • a pair of spaced apart supplementary cross pins formed by bolts 34 extend between the plates 24 immediately below the undersurface of the arm 13.
  • Bolts 34 serve to hold the plates 24 in operative position in the event that the primary loan bearingmembers.
  • the cross pins 32 should become loosened in operation-Bolts 34 when positioned as described above also facilitate assembly and disassembly of the coupling 23 by serving as a means for positioning the lift arm 13 relative to the plates 24 during installation or removal of the cross pins 32.
  • Lift arm mechanism for a loader vehicle which has an elevatable bucket for receiving and lifting material comprising:
  • a lift arm having first and second ends and having an intermediate section between said ends
  • first pivot means for coupling said first end of said lift arm to said vehicle and providing for raising and lowering of said second end thereof
  • a linear fluid motor having one end pivotally connected'to said vehicle and having an opposite end extending between said lower portions of said plates
  • cross pins are of the form having bolt means for axially compressing said pins to thereby cause radial expansion of said pins to wedge said pins in said plates.

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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)
  • Shovels (AREA)
US408667A 1973-10-23 1973-10-23 Lift arm assembly for loader vehicles Expired - Lifetime US3884378A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US408667A US3884378A (en) 1973-10-23 1973-10-23 Lift arm assembly for loader vehicles
CA207,406A CA1006465A (en) 1973-10-23 1974-08-20 Lift arm assembly for loader vehicles and the like
JP10659874A JPS5735330B2 (enExample) 1973-10-23 1974-09-12
BR7599/74A BR7407599D0 (pt) 1973-10-23 1974-09-12 Mecanismo para um braco de elevacao de uma carregadeira
BE149809A BE821394A (fr) 1973-10-23 1974-10-23 Ensemble a bras elevateurs pour vehicules chargeurs et analogues

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US408667A US3884378A (en) 1973-10-23 1973-10-23 Lift arm assembly for loader vehicles

Publications (1)

Publication Number Publication Date
US3884378A true US3884378A (en) 1975-05-20

Family

ID=23617235

Family Applications (1)

Application Number Title Priority Date Filing Date
US408667A Expired - Lifetime US3884378A (en) 1973-10-23 1973-10-23 Lift arm assembly for loader vehicles

Country Status (5)

Country Link
US (1) US3884378A (enExample)
JP (1) JPS5735330B2 (enExample)
BE (1) BE821394A (enExample)
BR (1) BR7407599D0 (enExample)
CA (1) CA1006465A (enExample)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4006834A (en) * 1976-01-15 1977-02-08 Caterpillar Tractor Co. Tilt linkage for loader buckets
DE2827283A1 (de) * 1977-06-23 1979-01-11 Caterpillar Tractor Co Traegeranordnung
US4162872A (en) * 1977-12-13 1979-07-31 Caterpillar Tractor Co. Lift arm assembly
US4725189A (en) * 1986-09-15 1988-02-16 Westendorf Mfg. Co., Inc. Rear-mounted loader bucket for a tractor including roll-back means
WO1993013002A1 (en) * 1989-11-22 1993-07-08 Intermodal Technologies, Inc. Bulk materials transportation system
US5238357A (en) * 1989-11-22 1993-08-24 Intermodal Technologies, Inc. Bulk materials transportation system
US5256023A (en) * 1989-11-22 1993-10-26 Intermodal Technologies, Inc. Roll-out forklift for bulk materials transportation system
FR2694316A1 (fr) * 1992-07-31 1994-02-04 Pel Job Groupe Chargeur-excavateur-élévateur.

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61102404A (ja) * 1984-10-24 1986-05-21 百々株式会社 柔軟復元性庇芯材を有する帽子

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2621817A (en) * 1948-08-27 1952-12-16 Int Harvester Co Tractor-mounted power loader
US3363792A (en) * 1965-12-20 1968-01-16 Pacific Car & Foundry Co Boom assembly for front end loaders
US3411647A (en) * 1967-02-23 1968-11-19 Int Harvester Co Boom assembly for tractor loader
US3606061A (en) * 1969-06-23 1971-09-20 Letourneau Inc Front end loader type vehicle
US3716159A (en) * 1971-02-17 1973-02-13 Caterpillar Tractor Co Automatic valve control mechanism for vehicle mounted implements

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2621817A (en) * 1948-08-27 1952-12-16 Int Harvester Co Tractor-mounted power loader
US3363792A (en) * 1965-12-20 1968-01-16 Pacific Car & Foundry Co Boom assembly for front end loaders
US3411647A (en) * 1967-02-23 1968-11-19 Int Harvester Co Boom assembly for tractor loader
US3606061A (en) * 1969-06-23 1971-09-20 Letourneau Inc Front end loader type vehicle
US3716159A (en) * 1971-02-17 1973-02-13 Caterpillar Tractor Co Automatic valve control mechanism for vehicle mounted implements

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4006834A (en) * 1976-01-15 1977-02-08 Caterpillar Tractor Co. Tilt linkage for loader buckets
DE2827283A1 (de) * 1977-06-23 1979-01-11 Caterpillar Tractor Co Traegeranordnung
US4134507A (en) * 1977-06-23 1979-01-16 Caterpillar Tractor Co. Flexing beam assembly
FR2395362A1 (fr) * 1977-06-23 1979-01-19 Caterpillar Tractor Co Fleche flexible
US4162872A (en) * 1977-12-13 1979-07-31 Caterpillar Tractor Co. Lift arm assembly
US4725189A (en) * 1986-09-15 1988-02-16 Westendorf Mfg. Co., Inc. Rear-mounted loader bucket for a tractor including roll-back means
WO1993013002A1 (en) * 1989-11-22 1993-07-08 Intermodal Technologies, Inc. Bulk materials transportation system
US5238357A (en) * 1989-11-22 1993-08-24 Intermodal Technologies, Inc. Bulk materials transportation system
US5256023A (en) * 1989-11-22 1993-10-26 Intermodal Technologies, Inc. Roll-out forklift for bulk materials transportation system
FR2694316A1 (fr) * 1992-07-31 1994-02-04 Pel Job Groupe Chargeur-excavateur-élévateur.

Also Published As

Publication number Publication date
JPS5073404A (enExample) 1975-06-17
CA1006465A (en) 1977-03-08
JPS5735330B2 (enExample) 1982-07-28
BR7407599D0 (pt) 1975-08-05
BE821394A (fr) 1975-04-23

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Legal Events

Date Code Title Description
AS Assignment

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

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

STCF Information on status: patent grant

Free format text: PATENTED FILE - (OLD CASE ADDED FOR FILE TRACKING PURPOSES)