Drifter

Japanese: drifter
Drifter

…The drilling speed varies greatly depending on the strength of the rock, but for granite, it can be up to several tens of centimeters per minute. A large horizontal drill is called a drifter, a small handheld downward drill is called a plugger or jack hammer, a small one with an air leg is called a leg hammer, and an upward drill with a support leg integrated with the rock drill is called a stopper. In recent years, pluggers and stoppers are rarely used. …

*Some of the terminology explanations that mention "drifter" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…さく孔速度は岩石の強度で大きく異なるが,花コウ岩などでは毎分数十cmまでである。大型の水平さく孔用をドリフターdrifter,小型で手持ちの下向きさく孔用をプラッガーpluggerまたはジャックハンマーjack hammer,小型でエアレッグを備えているものをレッグハンマーleg hammer,支持脚が削岩機と一体となっている上向きさく孔用をストーパーstoperと呼ぶ。近年はプラッガーとストーパーはまれにしか使用されない。…

※「drifter」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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