| 摘要 |
A quick-connect tool change system for hand drills comprisinga) a first, two ended, magnetic bit holder element fitting a chuck,b) at least one second working tool element slidingly fitting over the first bit holder element and having retaining means,The first bit holder element can comprise a natural magnet or an electro magnet selectively energized from a direct current source. A hand drill with a means to provide and transmit electric current to the electro magnet is also provided.
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