抄録
Deformation of a single flat spring in a fulcrum is analyzed. Two fundamental differential equations are solved using the first order approximation in the angle θ between a tangent at an arbitrary point P on the spring and a vertical line.
It is found that the problems on the deformation of the single flat spring can be evaluated algebraically using only the addition theorem for hyperbolic functions, and that the deformation curve of the flat spring is expressed by a part of hyperbolic or exponential curve.
Application of the fulcrum of a single flat spring to a scale is presented in comparison with the knife-edge fulcrum.
