| 摘要 |
A spring unit for use in force measuring apparatus, the unit being adapted to present an adjustable spring constant so as to be useful for measuring directional forces of widely different magnitudes imparted thereon. The spring unit includes a ring-shaped member adapted to be rotatably connected to the fixed frame of measuring apparatus about an axis of rotation in a manner such that the rotational position of the ring-shaped member can be selectively adjusted to a particular position, a hub member disposed within the ring-shaped member, and spring apparatus interconnecting the ring-shaped member and the hub member. The effective spring constant of the measuring unit is selectively adjustable through the rotation thereof about its axis of rotation so that the unit can effectively function within selected varying ranges of forces to be measured. A force proportional to the force to be measured is imparted to the hub member which is displaced within the ring-shaped member over a distance which is inversely proportional to the selected effective spring constant of the measuring unit. The amount of displacement of the hub member is measured by a transducer whose output is proportional to the force to be measured.
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