| 摘要 |
<p>The subject of the invention is an attachment to all drilling apparatus which include one or more chucks. The attachment is made to facilitate and speed up the invention into and removal from drill holding chucks. The attachment compreses a set of two collars (4 and 5) for every chuck (3). The first one of said collars (4) is attached or forms part of the chuck (3) and the second one (5) is fixedly attached or forms part of the body of the respective apparatus. Within a slot in the second collar is movable a driver (9 or 14) which can be brought into engagement with a recess (7 or 13) in the face of the first collar (4). When in engagement, the driver causes the chuck to rotate and to open for insertion or to close for removal of a drill.</p> |
