| 摘要 |
Apparatus for attaching a drill bit to a power tool. A first adaptor can be chucked into the tool. A second adaptor has a shank with a first longitudinal groove extending from one end and a second lateral groove intersecting the first. The shank is received in a bore of the first adaptor and a protrusion engages in the first and then the second groove as the shank is inserted and then rotated. The bore has a resilient spring member which engages the shank of the second member and prevents undesired counter-rotation. The first adaptor is equipped with a hexagonal recess which can, alternatively, engage hex-headed fasteners or the hexagonal stem of an internal recess driver attachment. |
