| 摘要 |
A cord tensioning device has three modes of operation: a tightening mode, a release to loosen and then hold mode, and a release mode for relieving all tension in the cord. In the tightening mode, the shape of ratchet pawls (116) and ratchet teeth (210) allow a cord winding spool (32) to rotate in only a tightening direction. In the release to loosen and then hold mode, an actuator associated with the knob (26) releases the ratchet pawl (116) from the ratchet teeth (210) in a reverse direction, but upon release of the knob, the pawl re-engages the ratchet teeth to prevent further loosening. In this manner, the tension can be incrementally loosened. In the release mode, the pawls are disengaged from the ratchet teeth, even after release of the knob, and the spool can continue to rotate within the base (36) when an external tension is applied to the cord. |
