EP0354675A1 - Vorrichtung zum Anschliessen eines Arbeitsgerätes an den Anhänger eines Traktors - Google Patents

Vorrichtung zum Anschliessen eines Arbeitsgerätes an den Anhänger eines Traktors Download PDF

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Publication number
EP0354675A1
EP0354675A1 EP89307352A EP89307352A EP0354675A1 EP 0354675 A1 EP0354675 A1 EP 0354675A1 EP 89307352 A EP89307352 A EP 89307352A EP 89307352 A EP89307352 A EP 89307352A EP 0354675 A1 EP0354675 A1 EP 0354675A1
Authority
EP
European Patent Office
Prior art keywords
tractor
frame
drive wheels
drive
implement
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Withdrawn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
EP89307352A
Other languages
English (en)
French (fr)
Inventor
John D. Campbell
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.)
Rapitex Systems Ltd
Original Assignee
Rapitex Systems 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 Rapitex Systems Ltd filed Critical Rapitex Systems Ltd
Publication of EP0354675A1 publication Critical patent/EP0354675A1/de
Withdrawn legal-status Critical Current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
    • E02F3/76—Graders, bulldozers, or the like with scraper plates or ploughshare-like elements; Levelling scarifying devices
    • E02F3/7622—Scraper equipment with the scraper blade mounted on a frame to be hitched to the tractor by bars, arms, chains or the like, the frame having no ground supporting means of its own, e.g. drag scrapers
    • 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
    • E02F3/086—Dredgers; Soil-shifting machines mechanically-driven with digging elements on an endless chain vertically shiftable relative to the frame
    • 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
    • E02F3/627—Devices to connect beams or arms to tractors or similar self-propelled machines, e.g. drives therefor
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F5/00—Dredgers or soil-shifting machines for special purposes
    • E02F5/02—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches
    • E02F5/14—Component parts for trench excavators, e.g. indicating devices travelling gear chassis, supports, skids

Definitions

  • This invention relates to apparatus for connecting a towed implement to a tractor.
  • the invention relates to apparatus for connecting a road maintenance implement to a tractor.
  • Road maintenance implements such as planers for removing unwanted material from the surface of a road or pavement, and flail machines for grooving and texturing such surfaces, are usually in the form of self propelled machines. It would be desirable to provide such implements in the form of "function modules" which could be attached to a tractor, such as a conventional agricultural or industrial tractor. This would avoid the necessity of providing equipment such as a drive engine and steering gear for each implement.
  • tractors go too fast for many operations which are performed by road maintenance equipment.
  • Second, the speed control of conventional agricultural or industrial tractors, employing discrete gear changes, is not adequate, compared with the continuously variable speed control used in self propelled road maintenance machines.
  • This invention consists in apparatus for connecting a towed implement to a tractor, the apparatus having drive wheels and means for lowering the drive wheels into engagement with the ground and for applying downward pressure on the drive wheels so as to lift the rear wheels of the tractor from the ground, and having drive means for driving the wheels of the apparatus to effect movement of the apparatus and the tractor.
  • the apparatus comprises a frame adapted to be connected to the tractor, the towed implement being connected in use to the frame.
  • the drive means on the apparatus has a continuously variable speed control.
  • the drive means may, for example, be a hydraulic motor carried on the apparatus and connected in use to the hydraulic system of the tractor.
  • a number of different implements may be provided for attachment to the apparatus.
  • different road maintenance implements could be provided.
  • Each implement could be provided as a separate module, with a common form of attachment to enable the module to be readily attached to and detached from the apparatus.
  • Power to the module for example for driving planing cutters, can be supplied by an engine in the module, or, preferably, from the power take off shaft of the tractor. The speed of operation of the cutters, or other mechanisms of the implement, can therefore be controlled independently of the forward speed of the apparatus.
  • the apparatus may be adapted to allow part of the weight borne by the drive wheels to be transferred to the implement.
  • means may be provided for adjusting the orientation of the frame of the apparatus relative to the tractor.
  • apparatus consisting of a mounting and propelling section 1 connects a function module 2 to a tractor 3.
  • the mounting and propelling section 1 consists of a rigid frame 10 connected at points 12 to the lower links 13 of the three-point linkage of the tractor so that the frame can move vertically relative to the tractor.
  • Two drive wheels 14, about 400mm in diameter, are carried on an axle 16 mounted in suitable bearings on the frame 10.
  • the wheels are driven by a suitable transmission, such as a chain drive 18, from a hydraulic motor 20 carried on the frame 10 and connected to the hydraulic circuit of the tractor through a control valve (not shown).
  • the frame 10 can be raised and lowered by means of two double acting hydraulic rams 22 each connected between a fixed anchorage 23 on the tractor and a point 24 on a frame member 25 in the lower part of the frame 10.
  • a third hydraulic ram 26 acts between a fixed point 27 on the tractor and the upper end of a frame member 28 pivoted at its lower end to the frame 10.
  • the upper end of member 28 is connected to the upper part of the frame 10 by means of an adjustable link 30.
  • a pair of tow bars 32 are connected between the tractor and the frame 10 to provide the principal means of traction.
  • the hydraulic rams 22 and 26 are connected to the hydraulic circuit of the tractor through suitable control valves (not shown).
  • the function module 2 has a body 50 having a drum 52, for example with planing cutters, and a drive mechanism 53 coupled by a suitable shaft to the power takeoff shaft of the tractor.
  • the body has pairs of upper and lower brackets 54 and 56 to attach the function module rigidly to the rear part of the frame 10, the upper brackets 54 being removable to enable the module to be attached to and detached from the frame 10.
  • the module may be provided with rear wheels 58, the height of which can be adjusted by a suitable mechanism 60 to vary the depth of cut, and to enable the orientation of the module to be adjusted, for example to modify the camber of the surface on which the module is working.
  • Operation of the hydraulic rams 22 moves the frame 10 between a raised position in which the frame 10 and module 2 are lifted from the ground, for transport by the tractor to the working location, and a lowered position in which the drive wheels 14 engage the ground and the rear wheels 4 of the tractor are lifted clear of the ground.
  • forward movement of the apparatus is effected by the drive motor 20 acting through wheels 14.
  • the speed of forward movement is therefore governed by the speed of the hydraulic motor 20, which can be controlled using a conventional control valve, to give an infinitely variable forward speed.
  • the front wheels of the tractor remain in contact with the ground, so that the tractor can be steered in the usual way.
  • the throws of rams 22 and ram 26 are selected in accordance with the geometry of the frame 10 so that the frame is kept in the same orientation as it is raised and lowered.
  • the orientation of the frame 10 can be adjusted to a limited extent by adjusting the length of link for example to transfer some of the weight from the wheels 14 to the drum 52.
  • the link 30 may, for example, be a threaded rod fixed at one end to the frame member 28 and extending through a hole in an upper member of the frame 10, with a nut 31 engaging the end of the rod and rotatable to adjust the effective length of the link.
  • a compression spring 33 surrounding the threaded rod acts between the frame member 28 and the frame 10, to allow compression of the link to acommodate movements of the module 2 due to irregularities in the surface over which the module is moved.
  • the up and down movement of the frame 10 relative to the tractor is effected by the double-acting rams 22, with the ram 26 maintaining the correct orientation of the frame.
  • the lower links of the tractor three-point linkage are used only to provide the necessary vertical freedom of movement of the frame, the hydraulic system of the tractor being employed only to provide hydraulic pressure for the rams 22 and 26 and the hydraulic motor 20.
  • control valves for the hydraulic rams 22 and 26 and for controlling the speed of the drive motor 20 may be grouped in a control module mounted on the tractor so that they can be operated from the driver's seat.
  • the described apparatus thus provides a means of attaching various function modulus to a tractor, whilst enabling the apparatus to be driven at a controllable low speed.
  • the only modifications required to the tractor are the provision of a bracket to provide the anchorage for the hydraulic rams, and the mounting of the control valve module in a suitable position.
  • the apparatus can therefore easily be connected to any conventional industrial or agricultural tractor.
  • the apparatus and function module could take forms different from those shown in the drawings.
  • the frame of the apparatus could be adapted to be connected in a fixed position to the tractor, and the drive wheels could be mounted so as to be movable relative to the frame.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Road Repair (AREA)
EP89307352A 1988-07-20 1989-07-20 Vorrichtung zum Anschliessen eines Arbeitsgerätes an den Anhänger eines Traktors Withdrawn EP0354675A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB888817302A GB8817302D0 (en) 1988-07-20 1988-07-20 Apparatus for connecting towed implement to tractor
GB8817302 1988-07-20

Publications (1)

Publication Number Publication Date
EP0354675A1 true EP0354675A1 (de) 1990-02-14

Family

ID=10640803

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89307352A Withdrawn EP0354675A1 (de) 1988-07-20 1989-07-20 Vorrichtung zum Anschliessen eines Arbeitsgerätes an den Anhänger eines Traktors

Country Status (2)

Country Link
EP (1) EP0354675A1 (de)
GB (1) GB8817302D0 (de)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3011278A (en) * 1960-12-14 1961-12-05 Lust Farms Mechanical earth mole
US3559415A (en) * 1967-11-03 1971-02-02 Donald R Vaughan Earth cutting apparatus
US3575006A (en) * 1968-09-20 1971-04-13 Tel E Elect Inc Underground cable-laying apparatus
US4195427A (en) * 1978-07-20 1980-04-01 Lanham Manufacturing Co., Inc. Chain trencher
FR2527669A1 (fr) * 1982-05-28 1983-12-02 Sm Termit Sa Procede pour la realisation de tranchees dans toutes sortes de terrains et roue trancheuse de machine pour la mise en oeuvre du procede
FR2587580A1 (fr) * 1985-09-24 1987-03-27 Babarit Marcel Dispositif de raclage avec benne basculante, attele au systeme trois points d'un tracteur
WO1987005350A1 (en) * 1986-03-10 1987-09-11 Sten Ove Hammarstrand Auxiliary unit for road grading

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3011278A (en) * 1960-12-14 1961-12-05 Lust Farms Mechanical earth mole
US3559415A (en) * 1967-11-03 1971-02-02 Donald R Vaughan Earth cutting apparatus
US3575006A (en) * 1968-09-20 1971-04-13 Tel E Elect Inc Underground cable-laying apparatus
US4195427A (en) * 1978-07-20 1980-04-01 Lanham Manufacturing Co., Inc. Chain trencher
FR2527669A1 (fr) * 1982-05-28 1983-12-02 Sm Termit Sa Procede pour la realisation de tranchees dans toutes sortes de terrains et roue trancheuse de machine pour la mise en oeuvre du procede
FR2587580A1 (fr) * 1985-09-24 1987-03-27 Babarit Marcel Dispositif de raclage avec benne basculante, attele au systeme trois points d'un tracteur
WO1987005350A1 (en) * 1986-03-10 1987-09-11 Sten Ove Hammarstrand Auxiliary unit for road grading

Also Published As

Publication number Publication date
GB8817302D0 (en) 1988-08-24

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