| 摘要 |
<p>The present invention relates to a bit of an air hammer which comprises: an air cylinder operated by air pressure; a piston moving up and down inside the air cylinder; and a bit for punching the ground through vertical vibration and rotation by being combined with the piston. The bit comprises: a bit axis (100) for playing the role of the body of the bit; an enlargeable diameter unit (200) made of an extended bottom diameter of the bit axis (100); a replacement-type bit unit (300) which is combined with a part processed with a stepped pulley along the bottom edge of the enlargeable diameter unit (200) to be detachable with a number of carbide tips for excavation (11) inserted in the surface to protrude; a fixing bolt (400) inserted to penetrate the top of the enlargeable diameter unit (200) and the bottom of the replacement-type bit unit (300) in the vertical direction; and a fixing nut (500) fastened to the fixing bolt (400) for fixating the replacement-type bit unit (300) to the enlargeable diameter unit (200).</p> |
