| 摘要 |
PURPOSE: A semiautomatic ratchet wrench is provided to rotate a ratchet wheel in a locking direction by turning a handle so that a locking bolt is securely locked. CONSTITUTION: A semiautomatic ratchet wrench(10) comprises a body unit, a socket unit(13), a ratchet unit(14), a direction change lever(15), and an auxiliary knob(16). The body unit comprises a handle(11) in one leading end. The socket unit is joined to the other leading end of the body unit and fastens or unfastens a locking bolt. The ratchet unit is joined to the body unit in the upside of the socket unit. A ratchet wheel of the ratchet unit is selectively rotates forward and reversely the socket unit. A plurality of gears is formed in the circumferential surface of the ratchet wheel. The direction change lever selects and changes a rotational direction of the ratchet unit. The auxiliary knob is joined to the upper part of the ratchet unit and rotated by a hand. |
