EP0061299A2 - Grabenbagger - Google Patents

Grabenbagger Download PDF

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Publication number
EP0061299A2
EP0061299A2 EP82301380A EP82301380A EP0061299A2 EP 0061299 A2 EP0061299 A2 EP 0061299A2 EP 82301380 A EP82301380 A EP 82301380A EP 82301380 A EP82301380 A EP 82301380A EP 0061299 A2 EP0061299 A2 EP 0061299A2
Authority
EP
European Patent Office
Prior art keywords
chain
bar
frame
trench
tooth
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Withdrawn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
EP82301380A
Other languages
English (en)
French (fr)
Other versions
EP0061299A3 (de
Inventor
John Bruce Brookfield
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.)
Gerni Equipment Pty Ltd
Original Assignee
Gerni Equipment Pty 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 Gerni Equipment Pty Ltd filed Critical Gerni Equipment Pty Ltd
Publication of EP0061299A2 publication Critical patent/EP0061299A2/de
Publication of EP0061299A3 publication Critical patent/EP0061299A3/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Withdrawn legal-status Critical Current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
    • E02F3/08—Dredgers; Soil-shifting machines mechanically-driven with digging elements on an endless chain
    • E02F3/12—Component parts, e.g. bucket troughs
    • E02F3/14—Buckets; Chains; Guides for buckets or chains; Drives for chains
    • E02F3/142—Buckets; Chains; Guides for buckets or chains; Drives for chains tools mounted on buckets or chains which loosen the soil, e.g. cutting wheels, or the like
    • 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 concerns small capacity trench diggers especially those suited to operation by one man which dig shallow trenches in soil for cables, small pipes, agricultural drains and the like.
  • One known trench digger for small scale use is mounted on a four wheel drive vehicle in which the operator sits in order to steer.and operate the 18 H.P. motor which drives an earth digging chain.
  • the chain is driven relatively slowly in comparison to chain fixed cutters and a continuously rotating worm at the rear of the vehicle clears earth from a chamber at the rear of the chain.
  • This digger has a scaled hydraulic motor and pump driven by the 18 H.P. motor.
  • Such arrangements enable the two motors to be located out of the path of flying spoil.
  • a small machine cannot economically incorporate a hydraulic system.
  • U.S. patent 3,614,838 describes a tree digging chain- saw for cutting the earth around trees and discusses the design of earth cutting teeth for such a saw. We have found that such teeth give satisfactory digging in that they clear a path for the chain but they are liable to suffer short life and reduce chain life because they are attached by only two pins to the link plates of the chain and the leverage exerted bn the pins by their tooth shape is very high. Besides such saws are dangerous for the operator to hold because obstructions to the teeth are hidden beneath the ground and sudden shocks are liable to cause an accident.
  • This invention provides a trench digger comprising:
  • the chain bar may have an upper end and a lower end; the transmission may have a housing and a shaft property horizontally from the housing perpendicular to the bar, and the upper end of'the bar .pivots about the axis of the shaft.
  • the shaft may have a sprocket which drives the endless chain and a collar upon which the chain bar is mounted for movement in a vertical plane.
  • the overload slip facility may be a centrifugal clutch which operates at engine speed and drives the shaft through a reduction gear.
  • a spoil guard may be fixed to the frame and extend between the upper end of the bar and the transmission housing over the top of the upper end of the chain bar and to the rear of the chain bar.
  • the frame may have two sides parallel to the direction of trenching and is supported on a pair of wheels with a common axis lying to the rear of the motor, transmission and chain bar with a wheel outboard of opposite sides of the frame, and a centrally placed third wheel giving a triangular wheel disposition.
  • the earth-digging teeth of the chain may be each of a conformation which increases the area of contact between the tooth and the chain when the tooth is tilted by the act of digging.
  • the tooth may have a body which is pierced in order to receive a pair of parallel chain pins, and a blade which has a leading, inclined cutting edge, a trailing blade edge extending in the direction opposite to the cutting direction which edge overhands a following part of the chain.
  • the chain may contain a plurality of interconnected link plates and the tooth is tiltable in relation to the chain path such that when the trailing edge tilts it contacts the link plate of the chain which lies adjacently rearward of the link associated with the pins upon which the tooth is mounted.
  • the body of the tooth may be bifurcated, being of modified V-shape consisting of a part which receives the pins and is parallel with the link plates and an earth-cutting-blade part which has a leading portion which terminates in the leading edge, inclined at a small angle to the chain path axis in order to give a useful width of trench, the trailing edge being likewise inclined in order to overlie the following link plate.
  • the pressed steel frame 2 supports the crankcase 4 of a motor 6.
  • a handle 8 enables the operator to push the frame on pneumatic wheels 10.
  • Motor 6 is an air cooled 5 H.P. HONDA model SCF with a centrifugal clutch running in an oil bath at engine speed.
  • a 2:1 reduction gear (not shown) produces half engine speed at the sprocket 12 equivalent to about 425 meters/min.
  • the clutch and reduction gears are located in the transmission housing 14.
  • Sprocket 12 is mounted on the.end of drive shaft 16.
  • Between sprocket 12 and the crankcase 4 is a large diameter bearing 18 around which a collar 20 is clamped.
  • the collar has slotted holes 22 for bolts 24 which secure a chain bar 26.
  • the bar thus pivots about shaft 16 under the control of links 28, 30, bellcrank 32, link 34 and lifting and lowering lever 36.
  • a toothed double quadrant 38 offers depth selection for digging.
  • the bellcrank 32 has a pair of pivots 40, 42 which give additional choice of depth in combination with the quadrant portions. Thus depths of 50, 75, 200, 350, 500, 600 and 520 mm.
  • the quadrants form part of a plate 44 which is bolted to the frame 2.
  • a third wheel 46 positioned near the centre and forwardly of crankcase 4 ensures that the frame 2 maintains a horizontal position on level ground.
  • the guard 48 is made of sheet metal and has a curved top 50 and an oblique rear wall 52 directed rearwards in order to direct spoil to the side of the machine and to protect the rear wheel 10 and the operator.
  • a side wall 54 completes the guard which is bolted to place 44.
  • each tooth 64 has a body part 66 which lies adjacent to a link plate and is provided with a pair of bores to receive pins 58.
  • the tooth has a blade 68 partially separated from the body by slot 70 to give a bifurcated conformation.
  • the leading edge 72 of the tooth proper is inclined and sharpened.
  • the tooth terminates in a tail 74 and a trailing edge 76 which is set to overlie link plate 78. The trailing edge projects 8 mm. beyond the end of the body part 66.
  • the chain has twenty-six teeth, thirteen to each side of the chain. Of each set of thirteen, seven are trench- cutting teeth 78 and the alternate six are chain- cleaning teeth 80.
  • the chain pitch is 19 mm, the roller diameter is 12.7 mm.
  • the bar In use the bar is raised horizontal by lever 36, the motor is pull-started and as the throttle is increased above 1800 rpm the chain begins to revolve and then reaches working speed. The lever is released to drop the bar to the selected working depth and spoil is thrown to the left of the machine by the guard 48. The operator then wheels the machine rearwards. If the trench needs widening beyond 100 mm. a wheel axle extension (not shown) is fitted to the wheel behind the spoil guard and the wheel re-positioned to the left of the existing trench, so that the trench is straddled by the wheels. A second cut is made parallel to the first.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Harvesting Machines For Root Crops (AREA)
EP82301380A 1981-03-23 1982-03-17 Grabenbagger Withdrawn EP0061299A3 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AUPE809381 1981-03-23
AU8093/81 1981-03-23
AU144/81 1981-08-10
AUPF014481 1981-08-10

Publications (2)

Publication Number Publication Date
EP0061299A2 true EP0061299A2 (de) 1982-09-29
EP0061299A3 EP0061299A3 (de) 1983-10-05

Family

ID=25642463

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82301380A Withdrawn EP0061299A3 (de) 1981-03-23 1982-03-17 Grabenbagger

Country Status (3)

Country Link
EP (1) EP0061299A3 (de)
CA (1) CA1186703A (de)
DK (1) DK125182A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986000355A1 (en) * 1984-06-18 1986-01-16 Jesse Harris Rock ditcher
US6684538B2 (en) * 1998-08-24 2004-02-03 Vermeer Manufacturing Company Cutting tooth for a trencher chain
CN106436797A (zh) * 2016-11-21 2017-02-22 福建农林大学 一种采用五杆机构调节驱动轮的等高线耕作坡地开沟机及其使用方法
CN110714492A (zh) * 2019-11-29 2020-01-21 吉林大学 一种地面矩形坑成型自平衡切割系统
CN112544155A (zh) * 2020-11-10 2021-03-26 上海震伯机械设备有限公司 一种链刀式土壤改良设备
CN117661667A (zh) * 2023-12-06 2024-03-08 山东省水利科学研究院 一种建造地下连续墙用挖槽装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4922763A (en) * 1988-07-26 1990-05-08 John Ashworth Method and an apparatus for taking soil samples

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3054198A (en) * 1959-06-24 1962-09-18 Auburn Machine Works Inc Mobile trenching tool
US3614838A (en) * 1969-04-04 1971-10-26 Bernard Wherry Tree digging chain saw
US3763581A (en) * 1971-08-04 1973-10-09 C Wolfston Hand operated endless trencher
AU510595B2 (en) * 1975-09-08 1980-07-03 Lionel Cramer Desmond Trenching apparatus
US4103441A (en) * 1977-05-09 1978-08-01 J. I. Case Company Trencher with offset drive wheels

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986000355A1 (en) * 1984-06-18 1986-01-16 Jesse Harris Rock ditcher
US6684538B2 (en) * 1998-08-24 2004-02-03 Vermeer Manufacturing Company Cutting tooth for a trencher chain
CN106436797A (zh) * 2016-11-21 2017-02-22 福建农林大学 一种采用五杆机构调节驱动轮的等高线耕作坡地开沟机及其使用方法
CN110714492A (zh) * 2019-11-29 2020-01-21 吉林大学 一种地面矩形坑成型自平衡切割系统
CN110714492B (zh) * 2019-11-29 2024-05-24 吉林大学 一种地面矩形坑成型自平衡切割系统
CN112544155A (zh) * 2020-11-10 2021-03-26 上海震伯机械设备有限公司 一种链刀式土壤改良设备
CN117661667A (zh) * 2023-12-06 2024-03-08 山东省水利科学研究院 一种建造地下连续墙用挖槽装置

Also Published As

Publication number Publication date
CA1186703A (en) 1985-05-07
DK125182A (da) 1982-09-24
EP0061299A3 (de) 1983-10-05

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Effective date: 19840605

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Inventor name: BROOKFIELD, JOHN BRUCE