US 11,904,448 B2
Hand-held power tool
Dario Bralla, Buchs (CH); Albert Binder, Buchs (CH); Donato Clausi, Arlesheim (CH); Michael Wierer, Röthis (AT); Serhey Khandozhko, Buchs SG (CH); and Nikolaus Hannoschoeck, Grabs (CH)
Assigned to Hilti Aktiengesellschaft, Schaan (LI)
Appl. No. 17/760,675
Filed by Hilti Aktiengesellschaft, Schaan (LI)
PCT Filed Oct. 7, 2020, PCT No. PCT/EP2020/078041
§ 371(c)(1), (2) Date Mar. 15, 2022,
PCT Pub. No. WO2021/073960, PCT Pub. Date Apr. 22, 2021.
Claims priority of application No. 19203810 (EP), filed on Oct. 17, 2019.
Prior Publication US 2023/0021949 A1, Jan. 26, 2023
Int. Cl. B25D 11/00 (2006.01); B25D 11/12 (2006.01)
CPC B25D 11/125 (2013.01) [B25D 11/005 (2013.01); B25D 2250/095 (2013.01); B25D 2250/131 (2013.01); B25D 2250/201 (2013.01); B25D 2250/221 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A method for controlling a hand-held power tool, the method comprising:
driving a pneumatic impact mechanism with an electric motor, wherein an exciter piston of the pneumatic impact mechanism is driven periodically by the electric motor and an impact piston of the pneumatic impact mechanism is coupled to the exciter piston via a pneumatic chamber,
sensing an acceleration of a machine housing along a striking direction of the impact piston at different phases in movement of the exciter piston;
estimating a pressing force on a tool of the hand-held power tool on a basis of the sensed acceleration of the machine housing and a phase in the movement of the exciter piston;
determining the pressing force selected from the group consisting of a low pressing force, a medium pressing force, and a high pressing force; and
regulating a rotational speed of the electric motor depending on the sensed acceleration at the different phases.