公开(公告)号：US20180001462A1

公开(公告)日：2018-01-04

申请号：US15532632

申请日：2015-12-01

Applicant: Hilti Aktiengesellschaft

Inventor： Rainer ONTL ,  Frank KOHLSCHMIED ,  Christoph DIEING

IPC: B25D17/24 ,  B25D16/00

CPC classification number: B25D17/24 ,  B25D11/125 ,  B25D16/00 ,  B25D2211/068 ,  B25D2217/0092 ,  B25D2250/005 ,  B25D2250/175 ,  B25D2250/201 ,  B25D2250/221 ,  F16F7/1005 ,  F16F7/104

Abstract: A hand-held power tool has a tool holder for holding a tool along a working axis. A hammer mechanism has a striker that is moved periodically at an impact rate along the working axis between a turning point in the proximity of the tool and a turning point remote from the tool. A drive control of the hammer mechanism sets the impact rate to a set point value. A vibration absorber has an oscillator that moves along the working axis about a resting position and one or multiple springs that drive the oscillator back into the resting position. A first sensor is used to determine a phase of the motion of the striker. A sensor is used to determine a first phase of a compression point of the hammer mechanism. Another sensor is used to determine a second phase of a turning point in the proximity of the tool, of the hammer mechanism. A damping controller adapts the set point value in such a way that a phase difference between the first phase and the second phase is less than a threshold value.