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Studies on the development of a new yarder which is exclusively used for Iw.U.S. in standing skyline system of cable logging

Research Project

Project/Area Number 58860020
Research Category

Grant-in-Aid for Developmental Scientific Research

Allocation TypeSingle-year Grants
Research Field 林学
Research InstitutionIwate University

Principal Investigator

OKAWARA Shoji  岩手大学, 農, 教授 (80003739)

Project Period (FY) 1983 – 1985
Project Status Completed (Fiscal Year 1985)
Budget Amount *help
¥8,000,000 (Direct Cost: ¥8,000,000)
Fiscal Year 1985: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1984: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1983: ¥3,900,000 (Direct Cost: ¥3,900,000)
Keywordsstanding skyline system / Iw.U.S. / differential friction clutch
Research Abstract

This yarder is characterized by the installation of a new special equipment of DRK (Differentialreibungskupplung), which enables the speed of the two operating lines (main and endless line) to be simply balanced, when it is applied to the Iw.U.S.. The fundamental principle of DRK is based on differential friction clutch, but unlike traditional interlocking in America, DRK functions not between every drive gear and driven drum, but direct between two drums (main and endless-drum) each other. Therefore any special design as a complicated, expensive or great and heavy yarder of interlocking is thoroughly avoidable.
This yarder can be also widely used for the other cable logging systems in general if DRK is merely kept to be free. The friction inside DRK causes the losses of power but it is sufficiently small to practical use and serves favorably as a brake for running of carriage caused by the gravity of load in the case of down-hill yarding, so that the control of another brake may not be necessary.
During inhaul the operator can control DRK with its lever very easily and almost stationarily. The trial product of the yarder with a power of 48 PS was developed in 1985 and then its expected properties were realized through the logging operations performed in the experimental forest of Iwate University. The main contributions of this method were : A. Continuous lifting the load above ground could be guaranteed under every skidding conditions. B. The operational efficiency of skidding could be greater than that when using of the brake on the endless-drum. C. From the ergonomical point of view the strain of the operator during control DRK was very slight (rather in relaxation), which was proved by the pulse measurment (heart checker) of the operator.

Report

(1 results)
  • 1985 Final Research Report Summary
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] 日本林学会大会発表論文集. 95. (1984)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1985 Final Research Report Summary
  • [Publications] 日本林学会大会発表論文集. 96. (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1985 Final Research Report Summary
  • [Publications] 日本林学会大会発表論文集. 97. (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1985 Final Research Report Summary
  • [Publications] Transactions of the Annual Meeting of the Japanese Forestry Society. 95. (1984)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1985 Final Research Report Summary
  • [Publications] Transactions of the Annual Meeting of the Japanese Forestry Society. 96. (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1985 Final Research Report Summary
  • [Publications] Transactions of the Annual Meeting of the Japanese Forestry Society. 97. (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1985 Final Research Report Summary

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Published: 1987-03-31   Modified: 2016-04-21  

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