EP0474210A1 - Vertikal hebender Laderausleger - Google Patents

Vertikal hebender Laderausleger Download PDF

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Publication number
EP0474210A1
EP0474210A1 EP91114932A EP91114932A EP0474210A1 EP 0474210 A1 EP0474210 A1 EP 0474210A1 EP 91114932 A EP91114932 A EP 91114932A EP 91114932 A EP91114932 A EP 91114932A EP 0474210 A1 EP0474210 A1 EP 0474210A1
Authority
EP
European Patent Office
Prior art keywords
lift arm
link
lift
assembly
main
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.)
Granted
Application number
EP91114932A
Other languages
English (en)
French (fr)
Other versions
EP0474210B1 (de
Inventor
Lonnie D. Hoechst
Orlan J. Loraas
Wally L. Kaczmarski
Larry E. Albright
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
Publication of EP0474210A1 publication Critical patent/EP0474210A1/de
Application granted granted Critical
Publication of EP0474210B1 publication Critical patent/EP0474210B1/de
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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes

Definitions

  • the present invention relates to loader boom assemblies for self-propelled loaders which are controlled to maintain the forward ends of the boom assembly in a generally vertically linear path throughout a substantial portion of the upward travel of the boom assembly.
  • Loader boom assemblies which provide a generally vertical movement of a bucket used for lifting material have been used.
  • U.S. Patent 4,355,946 illustrates a lift arm control linkage structure for a loader which uses a long lift arm support link at the rear portions of the loader boom assembly, to provide an altered upward path of a front bucket, and at the same time provides bucket leveling.
  • the present invention relates to a boom assembly for a loader which comprises a pair of lift arms, each including a pair of articulated links which are controlled in movement as the lift arms are raised to cause the outer ends of the lift arms to move generally vertically and substantially linearly when the lift arms are raised beyond a horizontal position.
  • the articulated links of each lift arm include a main forwardly extending lift arm link or section and a rear, substantially shorter lift arm link or section which has one end pivoted to the main lift arm link or section and the other end pivoted to the self propelled loader frame.
  • the path of movement of the main lift arm sections is partially controlled by a control link that is connected to the self propelled loader frame at a forward end of the frame and to the lift arm main section of the respective lift arm.
  • the lift arms are raised by operating hydraulic cylinders or actuators which react forces between the main lift arm sections and the loader main frame.
  • the rear lift arm link first is controlled to pivot about its pivot at the main loader frame so as to move the other or first end of the rear link which is pivoted to the main lift arm link rearwardly under control of the control link.
  • a loader assembly indicated generally at 10, made according to the present invention, is mounted onto a skid steer machine or prime mover 12 that has a main frame 14 that extends longitudinally in fore and aft direction, and is supported suitably on front and rear wheels 16. Wheels 16 are driven in a suitable manner through a drive train supported on the main frame 14, from an engine (not shown) in an engine compartment 15 mounted directly behind an operator's compartment indicated schematically at 18. Frame uprights 20 at the rear portion of the main frame are used for supporting the loader 10. Each of the uprights 20 comprises a part of spaced apart plates.
  • the main frame 14, frame uprights 20, the drive wheel configuration, fenders 22, and wide operator's compartment 18 are all features of the standard skid steer loaders.
  • the operator's compartment extends laterally across the entire main frame.
  • the operator's compartment extends substantially the full width between the inner plates of frame uprights 20 and fenders 22 (see Figure 4).
  • the present articulated boom is designed to fit onto the basic construction of the main frame, uprights and wide cab while permitting the usual access to service the machine in the same manner.
  • An engine compartment 15 is immediately behind the compartment 18 and the engine access door or panel 15A can be opened in the same manner as on existing machines because of the lack of interference from the rear links 32 and clearance of cross member 36 due to use of high pivots 40.
  • Skid steer loaders of the general type shown herein are well known and are manufactured by the Melroe Company, a business unit of Clark Equipment Company of Fargo, North Dakota, and are marketed under the registered trademark BOBCAT.
  • the loader 10 includes a lift boom assembly 24, which is, in the preferred embodiment, a two section boom.
  • the two section boom includes a main lift arm assembly 26 and a rear lift arm link assembly 28, which are pivotally mounted together.
  • the main lift arm assembly 26 includes a pair of laterally spaced main lift arm, links or sections 30, and a pair of rear or second lift arm links or sections 32.
  • the main lift arm links 30 are on opposite sides of the main frame connected with suitable cross members at the forward ends thereof, for example with a cross member shown at 34, and the spaced rear lift arm links 32 on opposite sides of the main frame are connected together with a suitable cross member 36.
  • the main lift arm assembly 26 has forward and rear ends, and at its rear end the main lift arm sections are each pivotally connected with suitable pivot pins 38, forming a pivot axis, to first ends of the rear lift arm links 32.
  • the connection is made so the main lift arm sections 30 and the rear lift arm links 32 lie on a common plane along the side of the operators compartment.
  • each of the rear lift arm links 32 is pivotally connected on suitable pins 40 forming a pivot axis to the respective frame uprights 20, adjacent the rear portions of the main frame 14, and at the upper portions of the upright and between the plates forming the respective frame uprights 20.
  • the axis of the pins 40, which define the pivoting axis of the rear lift arm link assembly is raised a substantial distance above a supporting surface indicated generally at 42.
  • the main lift arm sections 30 include downwardly extending forward arms 44 thereon, which extend downwardly and forwardly, just ahead of the forward wheels 16, with the lift boom assembly 24 in a lowered position.
  • an attachment pin 46 which defines a pivot axis for supporting a working implement.
  • the working implement is a bucket 48 that is supported on a subframe 50.
  • the subframe in turn is pivotally mounted on the pins 46, and is controlled by a tilt cylinder or actuator illustrated schematically at 52, in a conventional manner.
  • the tilt cylinder 52 is connected at its based end to a support 53 which is mounted on cross member 44.
  • the subframe 50 is an attachment frame that is sold by Melroe Company, a business unit of Clark Equipment Company, located at Fargo, North Dakota, under the trademark BOB-TACH.
  • any desired mounting for the implement or bucket 48 can be utilized, and in most instances there is a defined point such as the axis of pin 46 or the front lip of the bucket 48 that can be used for determining the path of movement of the forward ends of the main lift arms 30 during raising and lowering motion.
  • the main lift arm sections or links 30, have control arms 54 fixed thereto, at a location spaced forwardly from the pivot pin 38.
  • the control arms 54 are made of two spaced plates and extend downwardly along the sides of the operator's compartment 18, as can be seen, to a location just above the fenders 22.
  • Hydraulic actuator or cylinder attachment plate sections 56 are secured to the main lift arm section 30 on each side of the boom assembly in a suitable manner, or can be part of the plates forming control arms 54.
  • a separate double acting hydraulic actuator or cylinder assembly 58 is mounted on each of the sides of the main frame, and has a rod that is extendable and retractable.
  • the rod has a rod end that is connected with a suitable pin 60 between the respective spaced plates 56.
  • the base end of each actuator or cylinder 58 is connected with a suitable pin 62 to the main frame 14 and, as shown, is located between the plates forming uprights 20. It should be noted that the base end pin 62 for the double acting hydraulic actuator or cylinder 58 is substantially lower than the pivot pins 40.
  • the actuator extends upwardly and forwardly from the pivot pin 62 to pin 60n.
  • a control link which in the form of the invention is a fixed length or rigid link, is indicated generally at 66.
  • Each of the links 66 has a forward end pivotally mounted with a suitable pin 68 to a bracket fixed on the respective fender 22 and thus to main frame 14 of machine 12.
  • the opposite end of the rigid link 66 is connected with a suitable pin 70 to an end of the respective control arm 54 on each of the main lift arm sections 30 and is positioned between the plates forming the respective control arm 54.
  • Each link 66 is substantially horizontal with the boom assembly 24 in its lowered position.
  • the horizontal links 66 are substantially parallel to the direction of rearward force and will tend to hold each of the individual main lift arm sections 30 and rear lift arm links 32 from rearward movement. Part of this rearward load of course will also be transferred through the pins 38 to the rear lift arm links 32 and thus to the pivot 40 on the frame uprights, but with the articulated lift arms, that is, two lift arm sections pivoted together, there would be a tendency to cause folding of the main lift arm sections and rear lift arm links from horizontal load vectors acting rearwardly against the pin 46.
  • the links 66, actuator 58, the main lift arm section 30, and the rear lift arm section or link on each side of the boom assembly lie in a common plane to save lateral space and to fit existing skid steer machines without reducing the width of the operator's compartment or increase the overall width of the machine.
  • the actuators or cylinder assemblies 58 can be operated using a valve and a source of hydraulic pressure (not shown) to raise the boom assembly 24 to a raised, dumping position. As the boom assembly raises, the path of travel of the axis of the pin 46, or front edge of the bucket will define a substantially vertical path throughout the upper part of the working range used for dumping of buckets. Referring to Figure 1, the boom assembly 24 is shown at its lowered position.
  • the path of movement of the pin 46 is illustrated, and after the pin 46 reaches a height above the support surface 42 substantially equal to the level of the pin 40 (as shown by a horizontal dashed line in Figure 3), instead of moving on an arc rearwardly at the same time that the lift arms are raised further, the axis of the pin 46 moves substantially vertically to the full raised position of the lift arms.
  • the tilt cylinder 52 can be operated as desired for tilting the subframe 50 and the bucket 48 about the axis of pins 46, in the usual manner. It also follows that in any particular tilted position of the bucket 48, each point of the bucket, such as the leading edge, will move along a path corresponding to the path of the axis of the pin 46.
  • the main lift arm section or link 30 and the rear lift arm section or link 32 on each side of the loader form an included acute angle between the center line of the rear link 32, between the axes of pivot pins 38 and 40, and the line between the axes of pivot pin 38 and pin 46.
  • This included angle is represented by the double arrow 74.
  • the lift cylinder or actuator 58 is operated to start to raise the boom assembly 24 and, therefore, the bucket 48, the included angle represented at 74 will first decrease as the rear lift arm links 32 will be forced to move rearwardly by the rigid link 66, which pivots about pin 68 in an upward arc.
  • the control arm 54 positions the pivot pin 70 for the rear end of link 66 in a location such that rearward movement of the lift arm link 32 occurs as the arms swing.
  • Pin 46 then moves upwardly along a path 47 that is shown in Figure 3, and when the cylinder or actuator 58 has been extended to a point where the boom assembly 24 is about one-third of its total upward travel the included angle indicated by arrow 74 stops decreasing, and then starts increasing again as the two lift arm sections, comprising the main lift arm section or link 30 and the rear lift arm section or link 32 start to unfold as the end of link 66 moves forward on an arc.
  • the effective length of the boom assembly 24 from pivot pin 40 to the front end increases during the upper two-thirds of its upward travel to cause the vertical path of movement of the pin 46 and associated parts of the bucket.
  • the rigid control link 66 thus controls the path of pivotal movement of the pivot pin 38 as lift arm link 32 pivots about the pin 40.
  • the same path of travel is followed when the lift arms are lowered, because the control link 66 is fixed in length.
  • the present boom assembly achieves the objective of having a longer reach in the upper portions of the path of movement of the boom assembly so that it is easier to dump a bucket into a truck, and also that it is easier to make a pile that is higher, while maintaining the advantages of having a high pivot boom point 40 that is present in existing skid steer loaders, improved lifting capacity, and still having a compact loader which is as maneuverable as the prior skid steer loaders.
  • the plane defined by the axes of pins 68 and 70 is above the axes of the pin 62 for the lift cylinders or actuators 58, and the pin 70 is rearwardly of the pin 68 so that from the generally horizontal position of link 66 with the boom lowered, the pin 70 will move upwardly and forwardly which will cause the rear link 32 to first move rearwardly.
  • the axis of pin 70 crosses a plane defined by the axis of pins 68 and 38 and goes "overcenter" as it raises.
  • the rigid link 66 will cause the rear or second lift arm links to start to move forwardly as the main lift arm sections are further raised, again causing the included angle indicated by arrow 74 to start to increase.
  • the effective length of the boom assembly comprising the main lift arm sections or links 30 and the rear lift arm links 32 increases as raising continues.
  • the link 66 could be made adjustable in length to suit individual conditions that are desired for the path of movement, and provide for different control paths of the pin 46.
  • the mechanical linkage illustrated herein provides the desirable vertical path of movement of the pin 46 when the bucket has been raised to a desired level. In other words, the bucket raised along a substantially vertical path after it has reached a desired level near the level of the pivot axis of pin 40.
  • the loader assembly with the short rear lift arm links, that are mounted on a high pivot improves the rigidity of the lift boom assembly 24 so the lift arms travel in a definite path with clearance maintained along the sides of the operator's compartment.
  • the rear lift arm links 32 mounted on the high pivot 40 to the frame uprights 20, provides a boom assembly having the benefits of an articulated boom without extending into the space needed for the rear engine compartment opening, so that there is good service access for the engine compartment. It does not extend rearwardly beyond the rear access door 15A of the engine compartment 15.
  • the articulated boom loader of the present invention has a large degree of commonality of basic frame and drive structure with conventional skid steer loaders.
  • the path of movement of the bucket 48, and the forward ends of the lift arms, as stated, is such that the rear lift arm links 32 move rearwardly upon initial lifting, as guided by the rigid links 66. This tends to move the bucket in a more vertical path initially, so that the bucket 48 and its load stay close to the front tires and front of the main frame 14 as the bucket is first lifted, rather than moving out on a radius.
  • the rearward movement of the rear lift arm links has important features in defining the initial lifting path of the bucket.
  • the present invention provides a vertical lift path in the range of movement of a loader boom where the reach of the boom normally is reduced. This permits the operation of the loader in filling trucks and piling material to proceed more easily.
  • the control linkage provides a positive and reliable control for obtaining the vertical path of movement.
  • the present invention provides a vertical lift path in the range of movement of a radial arc boom machine where the reach of the boom normally increases or moves forwardly.
  • This mechanical linkage system of providing both inward movement initially and increased reach near full lift height can be packaged on a conventional skid steer machine design. This maintains the existing features of machine design, production processes, and field service procedures in the areas of operator compartment, controls, engine, transmission, hydraulics and hydrostatics, cooling system, electrical system, service access features and means of connecting attachment tools to the skid steer machine.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • General Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Shovels (AREA)
EP91114932A 1990-09-05 1991-09-04 Vertikal hebender Laderausleger Expired - Lifetime EP0474210B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US57764590A 1990-09-05 1990-09-05
US577645 1990-09-05

Publications (2)

Publication Number Publication Date
EP0474210A1 true EP0474210A1 (de) 1992-03-11
EP0474210B1 EP0474210B1 (de) 1996-10-30

Family

ID=24309575

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91114932A Expired - Lifetime EP0474210B1 (de) 1990-09-05 1991-09-04 Vertikal hebender Laderausleger

Country Status (6)

Country Link
EP (1) EP0474210B1 (de)
JP (1) JP3133793B2 (de)
KR (1) KR0162497B1 (de)
BR (1) BR9103803A (de)
CA (1) CA2050565C (de)
DE (1) DE69122933T2 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2278826A (en) * 1993-06-08 1994-12-14 Bamford Excavators Ltd Loader vehicle
EP0628664A2 (de) * 1993-06-08 1994-12-14 J.C. Bamford Excavators Limited Laderfahrzeug
WO2008118308A1 (en) * 2007-03-28 2008-10-02 Clark Equipment Company Lift arm assembly for a power machine or vehicle
CN112723251A (zh) * 2021-04-02 2021-04-30 山东工力机械有限公司 车载货物装卸叉车

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100360347B1 (ko) * 1999-03-31 2002-11-13 대우종합기계 주식회사 로더용 리프트 붐조립체
DE60143405D1 (de) 2000-09-26 2010-12-16 Komatsu Mfg Co Ltd Auslegervorrichtung mit senkrechtem auftrieb
JP4687152B2 (ja) 2005-03-09 2011-05-25 株式会社豊田自動織機 作業車両におけるリフトアーム装置、及びそれを備える作業車両
JP5094649B2 (ja) * 2008-09-03 2012-12-12 株式会社クボタ ローダ作業機
JP5119094B2 (ja) * 2008-09-03 2013-01-16 株式会社クボタ ローダ作業機
WO2018112211A2 (en) 2016-12-16 2018-06-21 Clark Equipment Company Loader with telescopic lift arm
USD832552S1 (en) 2017-10-12 2018-10-30 Clark Equipment Company Lift arm for loader
USD832551S1 (en) 2017-10-12 2018-10-30 Clark Equipment Company Loader

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR85419E (fr) * 1961-09-13 1965-08-06 Pelleteuse-chargeuse
US3215292A (en) * 1964-09-14 1965-11-02 Sperry Rand Corp Material handling apparatus-front lift type
US3586195A (en) * 1968-02-07 1971-06-22 Osmano Beltrami Digging and lifting device
US4355946A (en) * 1980-09-29 1982-10-26 Deere & Company Lift arm and control linkage structure for loader buckets

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR85419E (fr) * 1961-09-13 1965-08-06 Pelleteuse-chargeuse
US3215292A (en) * 1964-09-14 1965-11-02 Sperry Rand Corp Material handling apparatus-front lift type
US3586195A (en) * 1968-02-07 1971-06-22 Osmano Beltrami Digging and lifting device
US4355946A (en) * 1980-09-29 1982-10-26 Deere & Company Lift arm and control linkage structure for loader buckets

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2278826A (en) * 1993-06-08 1994-12-14 Bamford Excavators Ltd Loader vehicle
EP0628664A2 (de) * 1993-06-08 1994-12-14 J.C. Bamford Excavators Limited Laderfahrzeug
EP0628664A3 (de) * 1993-06-08 1995-05-10 Bamford Excavators Ltd Laderfahrzeug.
WO2008118308A1 (en) * 2007-03-28 2008-10-02 Clark Equipment Company Lift arm assembly for a power machine or vehicle
CN101668900B (zh) * 2007-03-28 2012-12-19 克拉克设备公司 用于动力机械或车辆的提升臂组件
US8453785B2 (en) 2007-03-28 2013-06-04 Clark Equipment Company Lift arm assembly for a power machine or vehicle
CN112723251A (zh) * 2021-04-02 2021-04-30 山东工力机械有限公司 车载货物装卸叉车

Also Published As

Publication number Publication date
JP3133793B2 (ja) 2001-02-13
KR920006223A (ko) 1992-04-27
DE69122933T2 (de) 1997-05-22
EP0474210B1 (de) 1996-10-30
BR9103803A (pt) 1992-05-19
CA2050565A1 (en) 1992-03-06
AU649263B2 (en) 1994-05-19
AU8359591A (en) 1992-03-12
JPH0626068A (ja) 1994-02-01
CA2050565C (en) 2003-04-15
KR0162497B1 (ko) 1998-12-01
DE69122933D1 (de) 1996-12-05

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