A tool used to turn bolt heads or nuts. It is also called a wrench. A wrench with an opening on only one side of the handle is called a single-ended wrench, and a wrench with an opening on both sides is called a double-ended wrench. Open-ended wrenches are the most commonly used. The size of a wrench is indicated by the size of the opening in millimeters. A closed-ended wrench is used when a large force is required, and a socket wrench is used when the handle would get in the way of tightening. When using a wrench, the size of the opening must match the size of the bolt head or nut. There is also a monkey wrench (also called an adjustable spanner or simply a monkey) whose opening size can be freely changed. Wrenches are made of ordinary steel or tool steel, and are made by forging and hardening. [Hidetaro Nakayama] [Reference] |©Shogakukan "> Main types of hand finishing tools Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend |
ボルトの頭またはナットを回すのに使われる道具。レンチwrenchともいう。柄の片方だけに開口部のあるものを片口スパナ、両方にあるのを両口スパナという。この開口スパナがもっとも普通に使用されている。スパナの大きさは、開口部の大きさをミリメートルで表した数値で示す。大きな力を必要とするときには口の開いていない閉口スパナが用いられ、締め付けるのに柄がじゃまになるような場合にはソケットスパナが用いられる。スパナを使用するときには、開口部の寸法がボルトの頭やナットの寸法にあったものを用いなければならない。開口部の寸法を自由に変えられるモンキースパナ(モンキーレンチ、または単にモンキーともいう)というのもある。スパナの材料は普通鋼または工具鋼で、鍛造、焼入れしてつくられる。 [中山秀太郎] [参照項目] |©Shogakukan"> 手仕上げ用工具のおもな種類 出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例 |
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