US3499566A - Loader bucket linkage - Google Patents

Loader bucket linkage Download PDF

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Publication number
US3499566A
US3499566A US766111A US3499566DA US3499566A US 3499566 A US3499566 A US 3499566A US 766111 A US766111 A US 766111A US 3499566D A US3499566D A US 3499566DA US 3499566 A US3499566 A US 3499566A
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United States
Prior art keywords
bucket
boom
linkage
piston rod
link
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
US766111A
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English (en)
Inventor
Eddie B Wagner
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.)
Wagner Mining Scoop Inc
Original Assignee
Wagner Mining Scoop Inc
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 Wagner Mining Scoop Inc filed Critical Wagner Mining Scoop Inc
Application granted granted Critical
Publication of US3499566A publication Critical patent/US3499566A/en
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
    • E02F3/3408—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 parallelogram-type

Definitions

  • a loader is a vehicle having a bucket on the end of a forwardly extending boom.
  • the bucket is used as a scoop by tilting it forward and lowering the boom while driving the vehicle forward to shovel material into the bucket.
  • the boom is raised slightly so that the bucket will clear the ground and the bucket is turned upright on the boom to contain the load.
  • the bucket is dumped by tilting it forward with the boom either raised or lowered.
  • My prior Patent No. 3,291,330 discloses a bucket linkage having a joint which will break in one direction to pivot the bucket forward as far as necessary to dump the bucket when the boom is raised and the linkage is under tension.
  • the joint embodies a novel locking device which rigidifies the linkage so that the joint will not break when the linkage is straightened out and under compression.
  • Such a joint permits a linkage of relatively simple and economical construction placed directly above the boom so that the linkage will automatically level the bucket as the boom is raised and lowered.
  • Objects of the present invention are to provide an improved bucket linkage of the type shown in Patent 3,291,330, to provide means for jarring a heaped up load to the back of the bucket when the bucket is erected to carrying position after scooping so that the load will not spill while the vehicle is traveling, and to provide a novel arrangement of stops for arresting the rotative movement of the bucket when it is erected.
  • the bucket is tilted forward on its boom for scooping and dumping by extending the piston rod and it is erected for carrying a load by retracting the piston rod.
  • the retracting movement of the piston rod is arrested rather gently by the action of the hydraulic system leaving the load heaped up in the front side of the bucket and leaving the back side of the bucket incompletely filled. This results in considerable spillage when the vehicle travels over rough ground with its load.
  • a stop is provided on the boom to limit the downward swinging movement of the piston rod in erecting the bucket and a stop is provided on the back of the bucket to engage the link interconnecting the piston rod and bucket when the bucket reaches the erected position.
  • the novel relationship of these two stops abruptly halts the erecting movement of the bucket, jarring the heaped up portion of the load to the partially empty back part of the bucket. This levels the load sufliciently that spillage is substantially eliminated in traveling on rough ground.
  • FIGURE 1 is a side elevation view of the front end of a loader vehicle showing its boom and bucket in different positions in full and broken lines;
  • FIGURE 2 is a view taken approximately on the line 22 in FIGURE 1;
  • FIGURE 3 is an enlarged view on the line 3-3 in FIGURE 2;
  • FIGURE 4 is a schematic diagram illustrating the geometry of the linkage.
  • FIGURE 1 shows the front end of such a vehicle having a frame 10 and front wheels 11.
  • the rear end of the vehicle is supported on a similar pair of wheels and carries an engine for driving the vehicle.
  • a hydraulic pressure system for operating various instrumentalities by means of suitable control valves at the operators station.
  • a forwardly extending boom 12 is pivotally mounted at its rear end on pins 13 in frame 10.
  • the front end of the boom is forked, having a pair of arms 14 straddling opposite sides of loader bucket 15.
  • a pair of pins 16 in the arms 14 provide pivotal support for the bucket on the boom.
  • the boom is raised and lowered by a pair of boom liftcylinders 17 having piston rods 18 on opposite sides of the boom.
  • the lower ends of cylinders 17 are pivotally connected to frame 10 by means of pins 19 and the upper ends of piston rods 18 are pivotally connected to the boom by means of pins 20.
  • Bucket 15 is tilted on its supporting pins 16 by a linkage comprising a double acting cylinder 25, piston rod 26 and link 27.
  • the rear end of cylinder 25 is pivotally connected to frame 10 by a pin 28.
  • the front end of piston rod 26 is pivotally connected to the rear end of link 27 by a pin 30 and the front end of link 27 is pivotally connected by a pin 31 with an ear 32 on the back wall 33 3 of the bucket.
  • the bucket also has a pair of opposite end walls 34 which support the bucket on pins 16 and a front wall 35 with a lip 36 on its upper edge for digging and scooping.
  • Cylinder 25, piston rod 26 and link 27 form one arm of a parallelogram linkage which holds the bucket erect when the boom is raised.
  • Link 27 has a rear end portion 40 of inverted U-shape extending behind pin 30 and overhanging piston rod 26.
  • the three pins 28, 30 and 31 lie in a straight line in FIG- URE 1 when the piston rod 26 and link 27 are under tension.
  • the joint at pin 30 drops by gravity to an over-center position slightly below a line interconnecting pins 28 and 31.
  • extension 40 bears against the upper side of piston rod 26 to lock the joint against further pivotal movement so that linkage members 26 and 27 then function as a rigid compression or thrust member.
  • the piston rod at 26a and link at 27a have dropped into locked position by gravity, allowing these linkage members to exert thrust on the bucket for digging or scooping up material when the vehicle is driven forward.
  • the link members 26b and 27b may be under compression or tension depending upon the balance of the bucket and its load on supporting pins 16. If the link members are under compression, that condition will be changed to tension loading as the bucket is tilted forward to its dumping position at 150.
  • Link 27 then assumes a position wrapping around and bearing against a bottom portion of the bucket as shown at 270 with the link members 26c and 270 assuming an angular relation to each other. The bearing of link 270 against the bottom of the bucket provides a fulcrum for erecting the bucket from its dumping position when piston rod 26c is retracted.
  • Stop 46 is mounted on the back wall 33 of the bucket above pin 31 and extending rearwardly in overhanging position above link 27. This stop may be integral with ear 32 which carries the pin 31. Stop 45 is mounted on a bridge member 47 interconnecting the side plates 48 of boom 12 as shown in FIGURE 3. This stop is engageable With an eye 50 on the end of piston rod 26 which received the pin 30.
  • stops 45 and 46 mechanically stop the retracting movement of the bucket and linkage and the operator does not place the control valves in off position until after all movement has been stopped.
  • cylinder 25 and piston rod 26 swing clockwise about pivot pin 28. It will be observed in FIGURE 4 that stop 45 arrests this downward movement before the extended axis 55 of the all) piston rod intersects the axis of bucket supporting pins 16.
  • stop 45 arrests this downward movement before the extended axis 55 of the all) piston rod intersects the axis of bucket supporting pins 16.
  • extended piston rod axis 55 is still at a distance above the axis of pins 16 as repersented by the dimension 56.
  • pin 31 is at point 31a.
  • link 27 When piston rod 26 is extended to tilt the bucket, link 27 bears against stop 46 to lift the rear side of the bucket until the bucket overbalances forward and places the link and piston rod in tension, straightening out the joint at pin 30. When the tension is relaxed, extension 40 locks the joint so that link 27 can operate as a thrust member for scooping.
  • Stops 45 and 46 have the further advantage of mechanically and automatically determining the erect position of the bucket on the lowered boom without requiring the careful attention of the operator to this phase of the operation.
  • a loader comprising a boom pivotally mounted for vertical movement, a bucket pivotally mounted on said boom, a linkage extending along said boom and connected with said bucket for pivoting the bucket to scooping, carrying and dumping positions, said linkage having a downward movement in erecting said bucket from scooping to carrying position, a stop on said boom under said linkage to limit said downward movement of said linkage, and a stop on said bucket engageable with the upper side of said linkage in said carrying position.
  • said linkage comprising a link pivotally connected with said bucket and a linkage member having pivotal connection with said link, said first stop being engageable with said last pivotal connection, and said second stop being engageable with said link.
  • a loader as defined in claim 2, said linkage member comprising a cylinder and piston rod.
  • a loader as defined in claim 2 said bucket having further pivotal movementon the boom after movement of said linkage is limited by said first stop and before said second stop engages said link.
  • a loader as defined in claim 1 said linkage forming one arm of a parallelogram linkage to hold the bucket erect when the boom is raised.

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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)
  • Jib Cranes (AREA)
  • Operation Control Of Excavators (AREA)
US766111A 1968-10-09 1968-10-09 Loader bucket linkage Expired - Lifetime US3499566A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US76611168A 1968-10-09 1968-10-09

Publications (1)

Publication Number Publication Date
US3499566A true US3499566A (en) 1970-03-10

Family

ID=25075439

Family Applications (1)

Application Number Title Priority Date Filing Date
US766111A Expired - Lifetime US3499566A (en) 1968-10-09 1968-10-09 Loader bucket linkage

Country Status (2)

Country Link
US (1) US3499566A (enrdf_load_stackoverflow)
FR (1) FR2020225A1 (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4130209A (en) * 1974-06-20 1978-12-19 Mononen Sakari M Vehicles for taking on, transporting, and discharging a load
US9969283B2 (en) 2013-09-10 2018-05-15 General Electric Company Battery changing system and method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3013179A1 (de) * 1980-04-03 1981-10-08 Kramer-Werke GmbH, 7770 Überlingen Schaufelkoppvorrichtung

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3291330A (en) * 1965-06-01 1966-12-13 Wagner Mfg Inc Power loader

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3291330A (en) * 1965-06-01 1966-12-13 Wagner Mfg Inc Power loader

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4130209A (en) * 1974-06-20 1978-12-19 Mononen Sakari M Vehicles for taking on, transporting, and discharging a load
US9969283B2 (en) 2013-09-10 2018-05-15 General Electric Company Battery changing system and method

Also Published As

Publication number Publication date
FR2020225A1 (enrdf_load_stackoverflow) 1970-07-10
DE1950949A1 (de) 1970-06-04

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