チェーンソー用防振ハンドルの試作

Abstract

タル型スプリングを内蔵した防振ハンドルを試作し, 既存のチェーンソーハンドルと置き代えて振動を測定した結果, 前ハンドルでは防振効果が得られたが, 後ハンドルでは, 共振のため防振効果が得られなかった。また, 最終的に重量の増加は500gに押えることが出来て, チェーンソー全重量8kgから考えて, 容認できる範囲と思える。

We made trialy Anti vibration Handle for Chain Saw and tested its effect. This A.V. Handle is deviced to reduce the vibration by using Coil-Spring. Photo 1 shows the construction of A.V. Handle and Photo 3-5 show three types of A.V. Handle fitted at Chain Saw. We examined the effect of this A.V. Handle by Spring-hold test and Hand-hold test. Fig. 2-4 are the results of Spring-hold test and show that this A.V. Handle reduces well the vibration on the Front handle bar, but not on the Rear handle grip. Fig. 1 and 6 are the results of Hand-hold test and show that in which bands in frequency the vibration was reduced by using this A.V. Handle, and that the effect of anti vibration in the area of over 100Hz was greater than below 100Hz. This system may be useful of any other vibration tool, for example, brush cutter, rock drlil, concrete breaker and etc..