| 摘要 |
A string trimmer providing an incremental indexing of line when the head is stopped and started. The preferred embodiment of the string trimmer head includes a spool member within the body member, the spool member being coaxially positioned within the body member and being rotatable therewith. The spool member includes a grooved and face with a cam channel having at least one switchback and one arcuate segment. A connecting means attached to the body member includes a connector which runs within the cam channel. Upon starting the rotation, the connector runs along an arcuate segment of the cam channel (permitting relative rotation between the spool member and the body member thereby indexing a length of line) until contacting a switchback stopping point. The connector is biased to move along the switch back and resets along the switchback upon stopping of rotation. |
