| 摘要 |
<p>A tension-responsive fastener drive system is disclosed in which tension arising in a fastener is sensed by a feeler gauge. The gauge applies a retardive force to a sensing sleeve mounted for motion with the fastener drive shaft. When fastener drive shaft-sensing sleeve motion becomes unequal, or when the sensing sleeve is angularly displaced relative to the drive shaft, a stop mechanism is actuated to halt further fastener driving action. Thus, a predetermined tension can be applied to a fastener when the fastener is driven into or secured on a workpiece.</p> |
