Top Disc Spring Balance - Top Disc Spring Balance

…Generally, wire springs and helical springs are used for small weighing scales, while leaf springs and ring springs are used for large ones. The figure shows the structure of a disc spring scale, which is the most common type, that uses a 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 with a rack and pinion, and the mass of the object is read on a scale plate calibrated with weights. …

*Some of the terminology used in reference to "upper disc spring scales" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…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。…

※「上皿ばねばかり」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