EP1306489A1 - Chargeur frontal - Google Patents

Chargeur frontal Download PDF

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Publication number
EP1306489A1
EP1306489A1 EP02021575A EP02021575A EP1306489A1 EP 1306489 A1 EP1306489 A1 EP 1306489A1 EP 02021575 A EP02021575 A EP 02021575A EP 02021575 A EP02021575 A EP 02021575A EP 1306489 A1 EP1306489 A1 EP 1306489A1
Authority
EP
European Patent Office
Prior art keywords
front loader
locking pin
pin
loader
tool
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.)
Withdrawn
Application number
EP02021575A
Other languages
German (de)
English (en)
Inventor
Peter Reiterer
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.)
AGCO GmbH and Co
Original Assignee
AGCO GmbH and 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 AGCO GmbH and Co filed Critical AGCO GmbH and Co
Publication of EP1306489A1 publication Critical patent/EP1306489A1/fr
Withdrawn legal-status Critical Current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
    • E02F3/36—Component parts
    • E02F3/3604—Devices to connect tools to arms, booms or the like
    • E02F3/3609—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat
    • E02F3/3631—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat with a hook and a transversal locking element
    • 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
    • E02F3/36—Component parts
    • E02F3/3604—Devices to connect tools to arms, booms or the like
    • E02F3/3609—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat
    • E02F3/3645—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat with auto-engagement means for automatic snap-on of the tool coupler part

Definitions

  • the invention relates to a front loader with a quick-change frame for interchangeable tools which is coupled to the free end region and can be swivelled by tipping cylinders, at least one locking pin being mounted on the frame, which pin can be moved at a given unlocking signal from a locked position fixing the tool to the quick-change frame to an unlocked position releasing the tool, by a hydraulic auxiliary force against the force of a resilient element.
  • Front loaders of this type are pieces of equipment with which tractors are fitted to carry out certain jobs which arise particularly in agriculture and community facilities.
  • the work substantially consists of transporting many different materials, for which suitably adapted tools are required such as manure forks, earth scoops, compost scoops and pallet forks.
  • a tool of this type is held on a carrier articulated to the front of the loader and can be raised or lowered by drawing tipping cylinders engaging the carrier in or out.
  • the carrier in known front loaders has a horizontally extending, round crossbar at the top.
  • the tool is picked up by swinging the loader up, with the crossbar engaging from below in downwardly directed receiving apertures in upper holding devices on the tool and lifting the tool.
  • the lifting process continues - if necessary aided by drawing in the tipping cylinders - the bottom of the tool also swings towards the carrier; holes in the carrier are aligned with holes in holding devices on the tool. Locking pins which slide into these holes secure the tool in the position assumed.
  • a front loader is known from a Stoll company pamphlet P1260a of 10-11/97 under the name of HYDRO-LOCK where the locking pins for removing and fitting a tool are no longer handled manually as before but are slid into the unlocking or locking position by a double acting hydraulic cylinder.
  • the cylinder is activated by an unlocking signal to the associated control valve, which may be transmitted by the operator of the vehicle from the driver's cab.
  • the tractor operator no longer has to leave and climb back onto the vehicle several times when changing the tool. Equipping the front loader with such a cylinder is however very costly.
  • the problem of the invention is to make a front loader of the above type simpler and more favourably priced while retaining the advantages of the known front loaders.
  • the problem is solved, in that the locking pin can be moved into the unlocked position by an actuating mechanism which becomes active only in response to the unlocking signal, and which responds to the increase in the distance between the locking pin and the front loader which takes place when the tipping cylinders are drawn out.
  • a separate hydraulic cylinder used for unlocking and locking the tool can be dispensed with, and with it its whole supply of pressure oil including a control valve.
  • only a few easily produced parts, some of them standard parts, are required to form a front loader according to the invention.
  • the rod assembly made with them enables the force provided by the outwardly-travelling tipping cylinders to be used for unlocking the locking pins.
  • the actuating mechanism is switched into an inactive state in the absence of an unlocking signal and into an active state when an unlocking signal is sent.
  • the actuating mechanism has a bar and an arresting lever which is flexibly coupled thereto and mounted on the front loader, and which in the absence of an unlocking signal can be swivelled freely and adjusted according to the distance between the locking pin and the loader, and that on transmission of an unlocking signal when the tipping cylinders are drawn out an arresting pin may be slid into the path of movement of the arresting lever.
  • the arresting pin may be controlled by a lifting magnet mounted on the front loader. There are no problems in supplying it with electricity as it is located on the loader.
  • the actuating mechanism contains an actuating lever mounted for swivelling movement on the quick-change frame, which lever is coupled to the free end of the bar and has a cam plate which acts on an entrainment member on the locking pin.
  • the path of the actuating mechanism is transferred to the locking pins, in that the cam plate has a cam section which causes the locking pin to be moved into the unlocking position.
  • FIGs 1 and 2 show a front loader fitted on a farming tractor (not shown), the front loader 2 carrying a loading scoop as the tool 1 being lowered onto the ground.
  • the front loader 2 comprises two laterally spaced members 4, 5 which are linked by cross members 3 to form a rigid framework, each fixed to the tractor by a coupling tower 6 and each enabled to swivel in a vertical plane by a hydraulically operable lifting cylinder 7.
  • the end region of the members 4, 5 comprises bearing arms 8, at the free ends of which a quick-change frame 10 for the tools 1 is mounted for swivelling movement by means of hinge pins 9.
  • the quick-change frame 10 has two upwardly extending side members 11, 12, which are non-detachably joined by a bar 13 and an angle plate 14 in the upper region and by an angle 15 in the lower region.
  • the side members 11, 12 together with coupling rods 17 and with swivel arms 16 mounted for swivelling movement on the members 4, 5, the side members 11, 12 form two four-bar mechanisms which can be swivelled by means of two hydraulically operable tipping cylinders 18.
  • Fig. 2 the tipping cylinders 18 are shown in the drawn-in condition, in which the quick-change frame 10 assumes its most vertical position and the tool 1 a raised position.
  • Each cylinder 18 is supported on an arm 19a of a two-arm lever 19ab mounted laterally on the respective member 4, 5; together with a rod 20 acting on its other arm 19b and the coupling tower 6 the lever forms a parallelgram of rods in which the quick-change frame 10 is included.
  • the relative position of the frame 10 and thus of the tool 1 fitted on it is maintained when the front loader 2 pivots about its mounting point on the coupling tower 6.
  • the tool 1 has two downwardly directed catch hooks 21 in the upper region of its rear wall, the hooks engaging over the bar 13 as far as possible away from each other.
  • the rear wall abuts an angle plate 15 under its own weight, and two links 22 arranged in the lower region of the rear wall and projecting therefrom at right angles engage respectively between two walls 11a, 11b, 12a, 12b of the side members 11, 12.
  • Two locking pins 23, 24 engaging through aligned holes in the walls 11a, 11b, 12a, 12b and in the links 22 secure the tool 1 in this correct position, so that the catch hooks 21 cannot come off the bar 13 as a result of vertical impacts.
  • the two locking pins 23, 24 are coupled together by connecting links 25 and a bar 26.
  • the bar 26 is mounted displaceably in the walls 11a, 12a of the side members 11, 12 and is subject to the force of a biassed return spring 27, which is arranged on the bar 26 between a transverse pin 28 and the wall 12a and keeps both locking pins 23, 24 pushed into their locking position.
  • the locking pin 24 is bent into a U shape in its outer end region.
  • the resultant free limb 24a is subject to the force of a spring 30 on an abutment surface 31, the spring surrounding the locking pin 24 and being supported on the connecting link 25 and a transverse pin 29 in the locking pin 24.
  • the abutment surface is on top of the wall 12c which, together with a further wall 12d, mount the associated bearing arm 8 between them.
  • the length of the limb 24a is such that when the tool 1 is fully unlocked the end of the limb is just moved out of the region of the wall 12c, so that in the corresponding position of the tool 1 the locking pin 24 can be swivelled in front of the wall 12c by the force of the leg spring 30 as shown in Fig. 17.
  • the relevant connecting link 25 is rotatable on the locking pin 24 but immobilised in a longitudinal direction by means of transverse pins arranged on both sides.
  • an actuating mechanism shown in Figs 7 to 11 is provided.
  • the function of the actuating mechanism is to utilise a swivelling movement of the quick-change frame 10, leading to an enlargement of the distance between the locking pins 23, 24 mounted on the frame and the front loader 2, in order to slide the pins 23, 24 into the unlocked position.
  • the actuating mechanism For control of the locking pin 24 the actuating mechanism comprises an actuating lever 33 mounted for swivelling movement on the side member 11, with an integral two-part cam plate 34, a drawbar connected to the lever 33 by a universal joint 35, an arresting lever 37 mounted for swivelling movement on the cross member 3 and connected to the drawbar 36 by a universal joint 38, and a lifting magnet 39 also arranged on the cross member 3.
  • the actuating lever 33 is mounted for swivelling movement about a pin 40 in a plane extending radially of the unlocking pin 23.
  • the cam plate 34 is of U-shaped cross-section with its limbs engaging over and under the locking pin 23.
  • the cam plate 34 lies against a transverse pin 41 projecting from the locking pin 23 at both sides, so that swivelling of the actuating lever 33 anticlockwise in Fig. 7 causes the locking pin 23 to move towards the unlocked position.
  • a first, very curved region 34a of the cam plate 34 is used for movement into the unlocked position, while an adjoining, slightly curved region 34b does not cause any further movement and merely secures the locking pin 23 in the unlocked position.
  • the universal joint 35 shown in Fig. 7 between the actuating lever 33 and the drawbar 36 comprises two hinge pins extending towards each other in a T shape, one of which is mounted rotatably in a bush 42 welded to the actuating lever 33.
  • the other pin carries a forked member 43 fixed to the drawbar 36.
  • the arrangement and shape of the drawbar are chosen so that a force component strong enough for the purpose is transmitted from the drawbar 36 to the actuating lever 33, if necessary in all operating positions.
  • the universal joint 38 shown in Fig. 9 between the drawbar 36 and the arresting lever 37 similarly comprises two hinge pins extending towards each other in a T shape, one of which carries a forked member 44 joined rotatably to the drawbar 36.
  • the other pin is mounted rotatably in a bush 45 welded to the arresting lever 37.
  • the mounting of the arresting lever 37 on the cross member 3 of the front loader 2 can be seen from Figs 10 and 11.
  • a housing 46 is provided there on the cross member 3 and a hinge pin 47 is arranged on its front plate 46a.
  • the plate-shaped arresting lever 37 is mounted for swivelling movement on the hinge pin 47, spaced from the front sheet 46a by distance pieces 48.
  • the lifting magnet 39 operable from the driver's cab of the farming tractor, with its armature 49 extending parallel with the hinge pin 47, is arranged inside the housing 46 at the rear of the front plate 46a.
  • the armature 49 is joined to an arresting pin 50 which is mounted displaceably in a bush 51 against the force of a spring 52.
  • the bush 51 and arresting pin 50 extend into the immediate vicinity of the arresting lever 37, so that the pin 50 is placed in the swivelling plane of the lever 37 when the lifting magnet 39 is operated.
  • the tool 1 can be swivelled at will by drawing the tipping cylinders 18 in and out, within the limits imposed by the design, without this having any effective influence on the actuating mechanism.
  • the swivelling movement of the frame 10 when the tipping cylinders 18 are operated merely causes the arresting lever 37 to be swivelled without resistance.
  • the tool 1 If the tool 1 is to be exchanged for a different one it first has to be unlocked.
  • the front loader is lowered onto the ground with the tipping cylinders 18 drawn in, as shown in Fig. 2.
  • the driver of the vehicle then sends an unlocking signal by operating the lifting magnet 39, the armature 49 of which slides the arresting pin 50 into the path of the arresting lever 37 as shown in Fig. 12.
  • the tipping cylinders 18 are now drawn out as in Fig. 13, thereby increasing the distance between the locking pins 23, 24 and the arresting lever 37, the lever 37 swivels until it abuts the arresting pin 50, which prevents any further swivelling movement.
  • the tipping cylinders 18 On further drawing out of the tipping cylinders 18 the tool 1 swivels about the bar 13 at the top and is released from the quick-change frame 10 at the bottom. By lowering the front loader 2 the bar 13 can be moved downwardly out of the catch hooks 21, so that the tool 1 is removed from the frame 10. If no other tool is to be fitted the tipping cylinders 18 may be drawn in to protect their piston rods, thereby moving the swivelled locking pin 24 back as far as the wall 12a, where it is held securely in the catch 53.
  • the bar 13 of the quick-change frame 10 is inserted from below in the catch hooks 21 of the tool 1 to be fitted, while the tipping cylinders 18 are still drawn out.
  • the cylinders 18 are then drawn in.
  • the tool 1 swivels around the bar 13 in the process and lies against the quick-change frame 10.
  • the adjacent bearing arm 8 swivels the limb 24a of the locking pin 24 out of the catch 53 on the wall 12c until the pin 24 finally snaps back into its locking position through the force of the return spring 27 and locks the tool 1.

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)
  • Agricultural Machines (AREA)
EP02021575A 2001-10-26 2002-09-26 Chargeur frontal Withdrawn EP1306489A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0125695 2001-10-26
GB0125695A GB2381257B (en) 2001-10-26 2001-10-26 Front loader

Publications (1)

Publication Number Publication Date
EP1306489A1 true EP1306489A1 (fr) 2003-05-02

Family

ID=9924557

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02021575A Withdrawn EP1306489A1 (fr) 2001-10-26 2002-09-26 Chargeur frontal

Country Status (3)

Country Link
EP (1) EP1306489A1 (fr)
CZ (1) CZ303136B6 (fr)
GB (1) GB2381257B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8469081B2 (en) 2005-12-21 2013-06-25 Exxonmobil Research And Engineering Company Corrosion resistant material for reduced fouling, a heat transfer component having reduced fouling and a method for reducing fouling in a refinery
DE102014215330A1 (de) * 2014-08-04 2016-02-04 Deere & Company Werkzeugträger zum An- und Ablegen eines Werkzeugs für einen Lader, sowie Verfahren zum An- und Ablegen eines Werkzeugs
US10273650B1 (en) * 2018-05-02 2019-04-30 Deere & Company Work vehicle with latching carrier for attachments
US20220196056A1 (en) * 2020-12-21 2022-06-23 Kubota Corporation Locking bracket and methods of using the same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2488990A (en) * 2011-03-09 2012-09-19 Miller Int Ltd Excavator coupler with magnetic latch

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5565639A (en) * 1978-11-06 1980-05-17 Caterpillar Mitsubishi Ltd Quick coupler
US4243356A (en) * 1978-03-30 1981-01-06 Caterpillar Mitsubishi Ltd. Quick coupler
EP0447119A1 (fr) * 1990-03-07 1991-09-18 Swift Hitch Limited Engin de terrassement
US5078569A (en) * 1990-04-30 1992-01-07 J. I. Case Company Quick attaching mechanism for a front-end loader
DE4327942C1 (de) * 1993-08-19 1995-01-05 Deere & Co Vorrichtung zum Festlegen eines Werkzeugs an einem Hubwerk
EP0943738A1 (fr) * 1998-03-18 1999-09-22 Mailleux S.A. Système de verrouillage hydraulique d'un outil de chargeur

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CS240696B1 (cs) * 1984-10-05 1986-02-13 Miroslav Bublik Rychloupínač pracovního orgánu
CS268593B1 (en) * 1988-02-22 1990-03-14 Anton Ing Jeckel Quick-clamping device for small loaders
JP2587139B2 (ja) * 1991-01-16 1997-03-05 株式会社クボタ 車輌の作業具装着装置
GB2265601B (en) * 1992-03-11 1995-08-09 Samuel Trevor Mason Excavator with quick-change bucket system
US5562397A (en) * 1994-07-13 1996-10-08 Clark Equipment Company Power actuator for attachment plate
US5727342A (en) * 1996-04-18 1998-03-17 Wain-Roy, Inc. Hydraulic latch pin assembly for coupling a tool to a construction equipment
US5974706A (en) * 1997-03-10 1999-11-02 Clark Equipment Company Attachment construction for earthworking implement
IT1319865B1 (it) * 2000-03-27 2003-11-03 C M S N C Di Cangini Giorgio & Dispositivo per l'aggancio e lo sgancio rapido dell'attrezzo di scavonegli escavatori idraulici.

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4243356A (en) * 1978-03-30 1981-01-06 Caterpillar Mitsubishi Ltd. Quick coupler
JPS5565639A (en) * 1978-11-06 1980-05-17 Caterpillar Mitsubishi Ltd Quick coupler
EP0447119A1 (fr) * 1990-03-07 1991-09-18 Swift Hitch Limited Engin de terrassement
US5078569A (en) * 1990-04-30 1992-01-07 J. I. Case Company Quick attaching mechanism for a front-end loader
DE4327942C1 (de) * 1993-08-19 1995-01-05 Deere & Co Vorrichtung zum Festlegen eines Werkzeugs an einem Hubwerk
EP0943738A1 (fr) * 1998-03-18 1999-09-22 Mailleux S.A. Système de verrouillage hydraulique d'un outil de chargeur

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 004, no. 108 (M - 024) 5 August 1980 (1980-08-05) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8469081B2 (en) 2005-12-21 2013-06-25 Exxonmobil Research And Engineering Company Corrosion resistant material for reduced fouling, a heat transfer component having reduced fouling and a method for reducing fouling in a refinery
DE102014215330A1 (de) * 2014-08-04 2016-02-04 Deere & Company Werkzeugträger zum An- und Ablegen eines Werkzeugs für einen Lader, sowie Verfahren zum An- und Ablegen eines Werkzeugs
US9342093B2 (en) 2014-08-04 2016-05-17 Deere & Company Tool carrier for setting up and placing a tool for a loader, and method for setting up and placing a tool
US10273650B1 (en) * 2018-05-02 2019-04-30 Deere & Company Work vehicle with latching carrier for attachments
US20220196056A1 (en) * 2020-12-21 2022-06-23 Kubota Corporation Locking bracket and methods of using the same

Also Published As

Publication number Publication date
GB0125695D0 (en) 2001-12-19
GB2381257B (en) 2004-09-08
CZ303136B6 (cs) 2012-04-25
GB2381257A (en) 2003-04-30
CZ20023278A3 (cs) 2003-06-18

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