69 簡易索道に於ける索線の張力測定法について

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1. The tension of cable wire can be obtained by this method correctly and promptly in comparatively simple way by the following formula. (See Fig. 1 a. b.)T=(w・1)/(4・h).2. The safety factor of cable wire was taken generally within 5,therefore if it was such a one as was used in this experiment, we use maximum tensions which are below 80 kg. In such a case the elongation of cable wire in the place of measurement of tensions will not become important to the result.3. We can estimate the condition of tensions of the whole cable wire according to self-recording device e. g. Kymograph (See Fig. 2)4. Accordingly we can estimate the tensions of every moment immediately after burden (load) departed from the end of the upper part. But the slightest change of "h" has much influence, therefore it is necessary to measure "h" correctly as far as possible.5. As far the pulley of the part that requires measurement (B-Point in Fig 1) When its radius is not too small and has the least friction. the exact result can be obtained.6. When we take "l" as above mentioned we can diminish errors of measurement by choosing "W" properly according to the circumstance.7. when "l" and the weight of "W" are estimated correctly as far as possible, the exact result can be obtained.8. Our method is convenient not only to examine tensions in operation, but also to verify intial tension of cable wire.9. The application of this method is shown in Fig. 1 and θ=5°〜6° that is, tan θ≒ sin θ is ideal.10. The limit of errors of measurement is shown in formula (8) as following : T-(Wl)/(4h)<(W・h)/(2l)
一般社団法人日本森林学会の論文
1950-12-25

69 簡易索道に於ける索線の張力測定法について

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