| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a bit to be removed by loosening a screw with collapse or breakage (licking) in a plus-shaped groove or a hexagonal groove, and a Torx (registered trademark) shaped groove by neither replacing bits nor switching rotation directions by using a shock driver.SOLUTION: A shock driver bit, which is screw removal bit made of chromium steel attached to a shock driver, is characterized in that the screw removal bit comprises a bit body 1 and a crest type tip. The crest type tip has two edges or four edges having tip angles at both marginal parts, a slope 3 that slides off ahead at an angle of 28 degrees to 32 degrees formed on the left side of the center point of the tip, and a slope 3 that slides off beyond at an angle of 28 degrees to 32 degrees formed on the right side thereof, in which the marginal part forming the slope keeps both right and left ends lower than a level surface at an angle of 28 degrees to 32 degrees.</p> |
