Relationship between object weights and safety margin in precision grip

这项研究的目的是检查当人们握住轻质物体(8-180克，10种条件)时的安全边际。本研究研制了一种小型、轻便的力传感器抓取物体。对10名受试者在10种状态下的抓力、载荷和滑移力进行了测量。安全裕度的绝对值随着对象权重的增加而增大。另一方面，安全裕度的相对值在40g到180g之间几乎不变，而当物体重量从8g增加到30g时，安全裕度的相对值似乎增加了。因此，本研究表明，当物体足够轻时，安全裕度的相对值随物体重量的变化而变化。这一结果不同于以往研究中用重物测量时的结果。

The purpose of this study was to examine safety margins when people griped light weight objects (8-180 g, 10 conditions). In this study, small and light grasping object with a force transducer was developed and made. The grasp, load and slip forces were measured in the 10 conditions for 10 subjects. The absolute values of safety margin increased when the object weights increased. On the other hand, the relative values of the safety margins were almost constant from 40 g to 180 g while the values seem to increase when the object weights changed from 8 g to 30 g. Thus, this study showed that the relative values of safety margins change depending on the object weights when the object was sufficiently light. This result was different from those when the values were measured with heavy object in the previous studies.