Patent ID: 7322261

Claim:
A method for manufacturing a wrench handle, the method comprising: preheating a work piece made of metal, with a layer of carbon scale being generated on the work piece during preheating; simultaneously forging and pressing the work piece after preheating to form a wrench handle having upper and lower faces and at least one end for driving fasteners, with the carbon scale on the work piece being forged/pressed into the upper and lower faces of the wrench handle, with an indentation section being formed on each of the upper and lower faces of the wrench handle, with each said indentation section including a first level area having a first depth to an associated one of the upper and lower faces of the wrench handle, with the indentation section further including a second level area located at a position different from that of the first level area and having a second depth to the associated one of the upper and lower faces of the wrench handle, with the second depth being larger than the first depth; and removing the carbon scale after forging/pressing and leaving a plurality of pits in the upper and lower faces of the wrench handle, with each of the plurality of pits having a third depth to an associated one of the upper and lower faces of the wrench handle, with the third depth being larger than the first depth and smaller than the second depth, and with the plurality of pits being concealed by the indentation areas.