| 摘要 |
This invention relates to a power tool 1 of the kind having a driven member 15 adapted to releasably hold at least one working element 46. The power tool 1 can operate in either a working mode in which the driven member 15 is driven to enable the working element 46 to perform work, or an adjustment mode, in which the driven member 15 is adjusted to grip or release the working elemen t 46. The power tool 1 includes a selector means 17 operable to cause the powe r tool 1 to operate in either the working or adjustment mode. A power drill 1 is one form of power tool to which the invention is applicable. |
