Handheld power tool
AssigneeHilti Aktiengesellschaft
InventorsFrank Kohlschmied, Markus Hartmann
Life of this patent
Estimating the term…
Abstract
A handheld power tool 1 has a tool socket 2 to hold a tool along a working axis 11. A motor-driven, pneumatic striking mechanism 6 has an exciter 17 which is driven by a motor 5, a striker 14 that is coupled to the exciter 17 via a pneumatic chamber 19, and an intermediate striker 22 arranged on the working axis 11 in the striking direction 12 behind the striker 14. A ventilation opening 30 connects a cavity 29 situated between the striker 14 and the intermediate striker 22 to the environment. A valve 38 that closes the ventilation opening 30 is opened when actuated by the intermediate striker 22 when the intermediate striker 22 is moved into its working position counter to the striking direction 12.
Claims22
A handheld power tool comprising:
- a tool socket for holding a tool along a working axis;
- a motor-driven, pneumatic striking mechanism having an exciter driven by a motor, a striker coupled to the exciter via a pneumatic chamber, and an intermediate striker arranged on the working axis in a striking direction, the striker being located between the exciter and the intermediate striker on the working axis and striking the intermediate striker in a working position, the intermediate striker being monolithic;
- a ventilation opening connecting a cavity situated between the striker and the intermediate striker to the environment;
- and
- a valve allowing closing and opening of the ventilation opening and being opened when the intermediate striker is moved into the working position counter to the striking direction;
- the intermediate striker having a profiled circumferential surface, so that the intermediate striker in the working position does not cover up the ventilation opening and, when moved out of the working position in the striking direction, does cover the ventilation opening.
Dependencies are inferred from the claim text.