| 摘要 |
A releasable holding device between a holding arm (4) and a support (1) of a hand-operated apparatus comprises two parts (2, 3) in releasable centering engagement with a resilient holding means therebetween in the form of at least one magnet (19, 20). The magnet means, whether permanent magnet or electromagnet, is preferably disposed on a circle centred on the axis of the device with a safety switch (22) positioned on this axis, although the provision of such a switch is not mandatory. <IMAGE> |
