Rotary Hammer

摘要

A hammer/drill includes a housing, a motor with armature shaft, a spindle rotatably mounted about a longitudinal axis in the housing, a tool holder rotatingly driven by the motor about the longitudinal axis, a hammer mechanism for generating impacts acting on the tool holder, a drive shaft coupleable with the armature shaft, and a switching arrangement to switch between drilling, hammer drilling, and hammering modes. The switching arrangement comprises a selector and coupling part axially displaceable on the drive shaft between lower and upper positions, coupling and decoupling the drive shaft to the armature shaft respectively. The coupling part includes a sleeve comprising a flange, and the selector comprises a fork for engaging a lower part of the flange. A protuberance engages a drive member of the selector to pivot the selector when the spindle is rotated, engaging over only a portion of the rotational movement of the spindle.

主权项

1. A rotary hammer comprising:
a hammer housing; a motor having an armature shaft; a hammer spindle rotatably mounted about a longitudinal axis in the hammer housing; a tool holder provided at a front end of the hammer housing and being rotatingly driven by the motor about the longitudinal axis of the hammer spindle; a hammer mechanism provided in the hammer housing for generating impacts acting on the rear end of a bit inserted into the tool holder, the hammer mechanism having a drive shaft able to be selectively coupled with the armature shaft; and a switching arrangement having a spindle which can be rotated by a switching element from the outside of the hammer housing about a rotational axis, the spindle having a protuberance for switching the rotary hammer between a pure drilling mode and a hammer drilling mode and/or a pure hammering mode; wherein the switching arrangement comprises a coupling part axially displaceable on the drive shaft of the hammer mechanism between a lower position in which the drive shaft is coupled to the armature shaft and an upper position in which the drive shaft is decoupled from the armature shaft, and wherein the switching arrangement comprises a selector for displacing the coupling part between the lower position and the upper position; wherein the coupling part is formed with a sleeve comprising a flange and wherein the selector comprises a fork having two arms for engaging a lower part of the flange of the sleeve-shaped coupling part; wherein the selector comprises a drive member and wherein, the drive member and the protuberance are arranged so that the protuberance engages the drive member to pivot the selector when the spindle is rotated; wherein the protuberance and the drive member are adapted such that the protuberance engages the drive member over only a portion of the rotational movement of the spindle.