| 摘要 |
A hammer drill includes a tubular guide member for transmitting rotational movement to a tool and an anvil axially displaceably supported in the tubular guide member for imparting impacting force to the tool. An impacting mechanism within a cylindrical guide member is aligned with a tubular guide member for transmitting impacting force to the anvil. A tool holder is mounted on the front part of the tubular guide member and has a radially adjustable tool holding zone. The radial adjustment is effected by radially displaceable jaws cooperating with the conically shaped section of the tool holder. When the shank of a tool is inserted into the holder, by axially adjusting the conically shaped section, the jaws can be displaced inwardly into holding contact with the tool shank. For improved concentricity, the cylindrical guide member and the tubular guide member are formed as an axially extending unit. |
