Spring scale - Spring scale (English spelling)

Japanese: ばねばかり(ばね秤) - ばねばかり（英語表記）spring scale

A scale that balances the weight of an object with the elasticity of an elastic body and measures the mass of an object using Hooke's law. Generally, wire springs and helical springs are used for small weighing capacity scales, while leaf springs and ring springs are used for large ones. The figure shows the structure of an upper disc spring scale, which uses the most common helical spring. The lower end of the helical spring is attached to the pan support bar of the Roberval mechanism (a link mechanism consisting of a parallelogram ABCD) that supports the pan, and the upper end is attached to the scale frame via a zero-point adjustment screw. The extension of the spring, which is proportional to the weight of the object on the pan, is magnified by a rack lever that is linked to the pan support bar, and this is converted into the movement of a pointer that rotates via a rack and pinion, and the mass of the object is read off on a scale plate calibrated with weights.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

物体の重量を弾性体の弾力とつり合わせ，フックの法則により物体の質量を測定するはかり。一般に秤量の小さなはかりでは線状ばね，つる巻ばねが，大きいものでは板ばね，環状ばねが用いられる。図はもっとも一般的なつる巻ばねを用いた上皿ばねばかりの構造を示す。皿を支えるロバーバル機構(平行四辺形ABCDからなるリンク機構)の皿受棒につる巻ばねの下端を，上端を零点調節ねじを介してはかり枠にかけ，皿上の物体の重量に比例したばねの伸びを皿受棒と連動するラックレバーで拡大し，ラックとピニオンで回転する指針の動きに変え分銅で校正した目盛板で物体の質量を読み取る。

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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