Control of feed of trimmer line

A trimmer head comprising:

• a rotatable housing connectable to a trimmer line spool rotatably supported by said housing;
• and
• a locking mechanism for locking said trimmer line spool to said housing with a locking force,
• wherein the locking mechanism is arranged to be moved from a locked position to an unlocked position when a rotation speed of said trimmer head is increased above an operating speed, the increased rotation speed causing a releasing force greater than the locking force,
• wherein said locking mechanism in the unlocked position releases the trimmer line spool from said housing such that the trimmer line spool is rotatable relative to the housing and a trimmer line spooled around the trimmer line spool is released and to be pulled out by a centrifugal force caused by the rotation of the trimmer head, thereby allowing feed of the trimmer line,
• wherein the locking mechanism comprises a pivotal locking latch pivotably mounted to the housing and the trimmer line spool comprises a stop, wherein the pivotal locking latch is arranged to engage with the stop in the locked position, and
• wherein the trimmer line spool further comprises a releasing stop, wherein the pivotal locking latch is arranged to engage with the releasing stop when the locking mechanism is moved to the unlocked position.