| 摘要 |
<p>A retaining assembly (34) is provided for a tensioning arrangement for adjusting the tension of the cutting chain (18) in a chain saw (10). The retaining assembly (34) includes a rotatable knob (35) that operates in conjunction with the chain saw's engine chassis (14), clutch cover (30), and guide bar (20) and is rotatable about an axis of rotation between a tightening position for holding the guide bar (20) in place and a loosening position enabling the guide bar (20) to be repositioned whereby the tension in the cutting chain (18) is adjusted. A locking mechanism is provided for locking and unlocking the knob (35) for rotational movement. When the locking mechanism is in a locking position, moveable engagement points (44) of the locking mechanism extended beyond the confines of the knob (35) and engage fixed engagement points (46). When the locking mechanism is in the unlocking position, the moveable engagement points (44), having moved inwardly of the confines of the knob (35), are disengaged from the fixed engagement points (46).</p> |
