| 摘要 |
A ratchet wrench is manufactured by using a milling cutter to cut two lateral sides of a ratchet lever located at a front end of the ratchet wrench, so that an open recess having a predetermined size is produced on the ratchet lever; reserving a portion of material at a front end of the ratchet lever during the process of milling; and finishing the reserved material at the front end of the ratchet lever using a numerical control miller to produce a rib vertically extended between upper and lower front edges of the open recess; so that an eccentric shaft, a driving guider, and a ratchet yoke may be positioned in the open recess to complete the ratchet wrench. When the wrench is turned during operation, the rib is able to prevent the ratchet lever from deformation and extend the usable life of the ratchet wrench.
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