| 摘要 |
The tool has a shank portion 2 at its rearward end and tip (8, figures 1 and 2; 30, figures 3 and 4) at its forward end wherein the shank portion 2 can be releaseably locked in a tool holder (20) of a rotary hammer by at least one locking body (26) of the tool holder engaging a corresponding closed groove 12 formed on the shank. The forward end 12a of the closed groove is positioned sufficiently close to the rearward end of the tool that the rearward end of the tool is always located in the tool holder forwardly of the most forward position A of a hammering mechanism 22 of the rotary hammer. Therefore, while the drilling tool is in use, if the hammer is inadvertently switched to a hammering mode, the hammering mechanism will not impact the drilling tool and so will not damage or destroy it or prejudice the operation of the tool. The tool is particularly useful when the tip comprises a tile cutting tool (figures 1 and 2), and may also be useful when the tip comprises a screwdriver or nut driver bit (figures 3 and 4). |
