EP0405950A2 - Bagger - Google Patents

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Publication number
EP0405950A2
EP0405950A2 EP90307040A EP90307040A EP0405950A2 EP 0405950 A2 EP0405950 A2 EP 0405950A2 EP 90307040 A EP90307040 A EP 90307040A EP 90307040 A EP90307040 A EP 90307040A EP 0405950 A2 EP0405950 A2 EP 0405950A2
Authority
EP
European Patent Office
Prior art keywords
mounting
plate
boom
ground engaging
housing
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Withdrawn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
EP90307040A
Other languages
English (en)
French (fr)
Other versions
EP0405950A3 (en
Inventor
Michael Kukla
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.)
BRUFF GROUP Ltd
Original Assignee
BRUFF GROUP Ltd
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 BRUFF GROUP Ltd filed Critical BRUFF GROUP Ltd
Publication of EP0405950A2 publication Critical patent/EP0405950A2/de
Publication of EP0405950A3 publication Critical patent/EP0405950A3/en
Withdrawn legal-status Critical Current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
    • E02F3/08—Dredgers; Soil-shifting machines mechanically-driven with digging elements on an endless chain
    • E02F3/12—Component parts, e.g. bucket troughs
    • 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
    • E02F3/08—Dredgers; Soil-shifting machines mechanically-driven with digging elements on an endless chain
    • E02F3/085—Dredgers; Soil-shifting machines mechanically-driven with digging elements on an endless chain with auxiliary or additional digging elements other than digging elements on an endless chain
    • 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
    • E02F3/08—Dredgers; Soil-shifting machines mechanically-driven with digging elements on an endless chain
    • E02F3/10—Dredgers; Soil-shifting machines mechanically-driven with digging elements on an endless chain with tools that only loosen the material, i.e. with cutter-type chains

Definitions

  • This invention relates to a machine for digging trenches and of the kind comprising a boom or mounting upon which is mounted an endless chain, a bucket elevator or saw and support means for the boom or mounting and which in use can be secured to a tractor vehicle.
  • reaction forces which are applied to the boom or mounting tend to cause the boom or mounting to be pulled downwardly. Such downward movement has to be resisted otherwise the trench will be deeper then intended.
  • the most common way of resisting the reaction force is to transmit the force to the tractor vehicle. This requires that the aforesaid support means should be carefully designed and constructed. Even if the support means is able to withstand the reaction forces the forces can influence the operation and performance of the vehicle.
  • the object of the present invention is to provide a machine of the kind specified in a simple and convenient form.
  • a machine of the kind specified comprises a ground engaging plate which is movable relative to said boom or mounting and further means operable to secure said ground engaging plate to said boom or mounting whereby the reaction forces developed on said boom or mounting during operation of the machine are transmitted directly to the ground engaging plate and from said plate to the ground adjacent the trench which is being dug.
  • the machine is shown generally at 10 and is shown mounted (by support linkage 8) on a tiltable mast 9 of a tractor vehicle 11 conveniently of the track laying type.
  • the machine includes an elongated boom 12 which at its opposite ends mounts a pair of shaped rollers 13 only the lower one of which is shown, about which extends an endless chain indicated by the chain dot line 14.
  • the upper roller is located in a housing 15 which carries a hydraulic motor coupled to the upper roller. In use the motor drives the chain in the direction indicated by the arrow.
  • the boom 12 is shown in Figure 1 to be below ground level 16 and as the chain is driven material is removed by picks mounted on the chain, from the advancing end face of the trench.
  • the material which is removed is lifted by the action of the chain and is deposited for convenience, on a conveyor belt 17 which conveys the material laterally away from the trench.
  • a reaction force is applied to the boom 12 which tends to urge the boom downwardly to increase the depth of the trench and the reaction force is applied to the boom support.
  • a ground engaging plate 18 In order to absorb the reaction force there is located about the boom 12 a ground engaging plate 18. It is convenient to mount the conveyor 17 on the plate. As will be seen from Figure 2 the plate extends laterally on opposite sides of the boom and forwardly towards the tractor vehicle. The undersurface of the plate bears upon the surface of the ground and the leading edge of the plate considered in relation to the movement of the tractor vehicle, may be upwardly inclined.
  • the plate 18 When the machine is in use the plate 18 is clamped or otherwise secured to the boom so that the reaction force applied to the boom is transmitted directly to the plate and then to the surface of the ground engaged by the plate.
  • the body of the boom is of substantial construction having side members 19 against which in the particular example are urged a pair of clamping elements 20A, 20B respectively.
  • the elements are of "L" section and the element 20A is rigidly secured to the plate on one side of the boom.
  • the element 20B is slidably secured to the plate and in order to achieve clamping a pair of hydraulic rams 21 are energised.
  • the cylinders of the rams are secured to the plate and the pistons engage the element 20B and urge it relative to the plate into engagement with the boom.
  • the reaction force generated draws the element 20A into engagement with the boom and the practical effect is that the plate 18 is clamped to the boom so that the reaction forces applied to the boom by operation of the chain are transmitted to the plate and from the plate to the ground.
  • clamping elements 20A, 20B are formed from metal so that metal to metal contact takes place.
  • the faces of the elements facing the boom may be provided with a facing of friction material.
  • the clamping element 20B may be replaced by a wedging member which as the reaction force is applied moves into tighter wedging engagement.
  • the wedge can be in the form of a cylindrical member mounted for angular movement on the plate 18 about an offset axis parallel to but spaced from the adjacent side member 19 of the boom. Release of the clamp can be effected by operation of a piston/cylinder combination which imparts angular movement to the cylindrical member. Alternatively locating pins can be used to secure the plate to the boom.
  • the boom is shown at its maximum operating depth. It can be partly raised to reduce the depth of the trench or fully raised and then tilted for transport purposes by operation of hydraulic means on the tractor vehicle and by tilting the mast 9. It is convenient to be able to clamp the plate 18 to the boom before starting to dig the trench and in order to cope with varying depths of trench the plate must be movable relative to the boom.
  • the plate 18 has a housing 22 secured to its upper surface and at the trailing edge of the plate.
  • the housing mounts a pair of bearing assemblies and extends on opposite sides of an "I" section beam 23 which itself is carried on a pair of bearing assemblies 24 which are mounted on the housing 15.
  • the beam 23 can be moved axially by operation of a piston cylinder combination 25.
  • the latter and the beam are shown in the extended position but for the purpose of adjusting the plate, are retracted to enable a detachable pin (not shown) to be extended through an aperture 26 in the housing 22 and through an aperture 26A in the beam.
  • the plate 18 can be moved relative to the boom to the desired position after which the plate is clamped to the boom and the pin removed.
  • the beam can then be extended to provide support for a scoop 27 which acts to scrape the bottom of the trench free of any loose debris and to profile the trench.
  • the scoop in pivotally mounted on the end of the beam by means of a further piston/cylinder combination 27 and has to be moved to an inoperative position when adjusting the position of the plate 18.
  • reaction forces generated during operation of the machine are largely absorbed by the plate 18 so that the linkage connecting the machine to the tractor vehicle can be of simpler construction. Moreover, since the reaction force is not applied to the tractor operation of the latter is facilitated, since it is no longer subject to shock loading due to the action of the picks engaging hard material such as stones.
  • tractor vehicle illustrated is of the track laying type it can be of the wheeled type.
  • the invention is equally applicable to machines which employ a wheel carrying buckets or picks instead of the endless chain.
  • the ground engaging plate is secured to the mounting for the wheel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Agricultural Machines (AREA)
EP19900307040 1989-06-27 1990-06-27 Digging machine Withdrawn EP0405950A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8914753 1989-06-27
GB898914753A GB8914753D0 (en) 1989-06-27 1989-06-27 Digging machine

Publications (2)

Publication Number Publication Date
EP0405950A2 true EP0405950A2 (de) 1991-01-02
EP0405950A3 EP0405950A3 (en) 1991-11-06

Family

ID=10659137

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900307040 Withdrawn EP0405950A3 (en) 1989-06-27 1990-06-27 Digging machine

Country Status (2)

Country Link
EP (1) EP0405950A3 (de)
GB (1) GB8914753D0 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5189817A (en) * 1992-07-24 1993-03-02 Case Corporation Crumber mechanism for a trencher machine

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2684542A (en) * 1950-01-20 1954-07-27 Albert J Larson Deflector and support for endless chain ditching machines
NL102859C (de) * 1958-09-12
GB890587A (en) * 1959-04-29 1962-03-07 John Allen & Sons Oxford Ltd Improvements in or relating to trenching machines
FR2590292B1 (fr) * 1985-11-18 1988-01-15 Dalaine Jean Charles Machine a fleche coulissante pour la realisation de tranchees ou le drainage du sol
US4877355A (en) * 1988-04-19 1989-10-31 Casper Colosimo & Son., Inc. Underwater cable laying system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5189817A (en) * 1992-07-24 1993-03-02 Case Corporation Crumber mechanism for a trencher machine

Also Published As

Publication number Publication date
GB8914753D0 (en) 1989-08-16
EP0405950A3 (en) 1991-11-06

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