| 摘要 |
A drilling and/or percussive hammer comprises a handle (10) and a hammer housing (1), which can move relative to the handle (10) and inside of which, among other things, a pneumatic spring percussive mechanism (4) is housed. The pneumatic spring of the pneumatic spring percussive mechanism (4) can be ventilated via a no-load operation duct (13, 15, 17, 26, 27) that is opened and closed by a valve (16, 17, 25). The valve (16, 17, 25) can be opened and closed according to a pressing force acting upon the handle (10). A delay device (18, 20, 21, 29, 30) controls the valve (16, 17, 25) during closing so that the valve reaches the position corresponding to the detected pressing force only with a time delay. This causes a smooth transition from the no-load operation to the percussive operation.
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