| 摘要 |
<p>An air ratchet wrench includes a wrench body (2), a rotary driving head (31), an airflow unit (4) formed in the wrench body (2), a switch unit (5), a driving unit (6) and a valve assembly (7) . The airflow unit (4) includes a primary air path (41) and a pair of head-directing paths (42). When the driving unit (6) is triggered, airflow is permitted to enter the primary air path (41) for driving rotation of the driving head (31), and is prevented from entering any of the head-directing paths (42). When the driving unit (6) is not triggered, airflow is prevented from entering the primary air path (41), and is allowed by the valve assembly (7) to enter one of the head-directing paths (42) selected through user operation of the switch unit (5) for controlling rotation direction of the driving head (31).</p> |
