| 摘要 |
A screw holding screwdriver bit capable of effectively preventing a come-out from occurring by improving the structure of the blade portions thereof, capable of being manufactured in a simple structure at a low cost, and capable of remarkably increasing a working efficiency by allowing an appropriate and rapid screw tightening operation at all times, and the combination thereof with screws, the driver bit including a plurality of blade portions ( 12 ) having generally vertical end edge portions ( 13 ) formed at the tip ends ( 12 a) thereof, wherein one of the blade portions ( 12 ) is cut out in the axial direction of the bit, a guide passage ( 16 ) of a specified length is provided in a shaft ( 11 ) portion continued generally on the extension of the cutout portion ( 15 ) of the blade portion, and an elastic piece ( 18 ) allowed to elastically abut on a bit engagement groove in a screw head and having a screw holding function by the interaction thereof with the blade portion fitted in the bit engagement groove is inserted in the guide passage.
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