Patent ID: 6015017
Filing Date: 2000-01-18
Classification: B25D

Abstract:
A rotary hammer comprising:a hammer housing having front and rear ends;a hammer spindle rotatably mounted in the housing for rotation about an axis;a drive sleeve rotatably mounted on the hammer spindle;a coupling sleeve is non-rotatable but axially displaceably mounted on the hammer spindle to rotate therwith and couplable to the drive sleeve;a motor having an armature shaft extending perpendicular to the hammer spindle axis;a tool holder for receiving a bit, the holder located at the front end of the hammer housing and rotatably drivable by the motor about the hammer spindle axis;a hammer mechanism in the hammer housing for generating impacts acting on a rear end of the bit and having a drive shaft;the armature shaft being selectively coupled with the hammer mechanism drive shaft for generating impacts and being selectively coupled with the coupling sleeve via the drive sleeve for driving the hammer spindle;a switching element rotatable about a main axis and having a cam section for switching between at least a first pure drilling mode, a second hammer drilling mode and a third chiseling mode;a slider part movable parallel to the axis of the hammer spindle;the cam section acting on the coupling sleeve via the slider part to move the coupling sleeve between a position engaged with the drive sleeve and a release position separated from the drive sleeve;a coupling part coaxially movable relative to the drive shaft between a first and second position engaging and disengaging, respectively, a drive connection between the armature shaft and the drive shaft; andan actuating section connected to the switching element eccentrically relative to the main axis for moving the coupling part between the first and second positions.