Patent ID: 8028424

Claim:
A cutting head for a brush cutter or edge trimmer, the head being of the type including at least a passageway for a cutting string and a locking element for engaging and locking said cutting string, wherein said locking element comprises: at least one ratchet wheel including a toothed wheel mounted adapted to engage with the cutting string and in rotation around an axis in such a manner that the teeth of the toothed wheel project in the passageway; and a ratchet cooperating with the toothed wheel so that the toothed wheel can turn in a given direction to allow the introduction of the cutting string in the passageway and cannot turn in the opposite direction to lock the cutting string in the passageway, wherein said ratchet includes a cam pin configured to pivot around an axis, wherein the distal end of the cam pin can lodge itself between two successive teeth of the toothed wheel and cooperate with a return spring of said cam pin to maintain said cam pin between two successive teeth of said toothed wheel, and wherein the return wherein said ratchet includes a cam pin configured to pivot around an axis, wherein the distal end of the cam pin can lodge itself between two successive teeth of the toothed wheel and cooperate with a return spring to maintain said cam pin between two successive teeth of said toothed wheel; spring is a coiled spring having a first end and a second end, the coiled spring extending in a blind hole of the cutting head, the first end of the coiled spring leaning against the bottom of the blind hole and the second end of the coiled spring leaning against the cam pin.