Thumbscrew with automatic torque-limiting feature

摘要

A retainer screw for maintaining a retained device such as a cable connector in a connected condition with a host device is provided with a torque disconnecting mechanism that responds to the axial movement of the retainer screw and disconnects the drive of the screw before the screw bottoms in the receiving nut. Disconnecting the drive not only prevents undue torque from being applied to the screw but also prevents seizure of the screw by the nut, preventing easy removal. Also, the disconnecting mechanism continues to provide connection of the drive torque in an unthreading direction notwithstanding the inability of the screw to be driven in the threading direction. The drive member of the retainer screw is allowed to ratchet relative to the screw to relieve the torque.