US 11,919,134 B2
Working tool
Tilo Dittrich, Feldkirch (AT); Norbert Heeb, Buchs (CH); Emanuel Kurth, Chur (CH); and Chafic Abu Antoun, Buchs (CH)
Assigned to Hilti Aktiengesellschaft, Schaan (LI)
Appl. No. 17/615,234
Filed by Hilti Aktiengesellschaft, Schaan (LI)
PCT Filed Jun. 22, 2020, PCT No. PCT/EP2020/067348
§ 371(c)(1), (2) Date Nov. 30, 2021,
PCT Pub. No. WO2021/001196, PCT Pub. Date Jan. 7, 2021.
Claims priority of application No. 19184363 (EP), filed on Jul. 4, 2019.
Prior Publication US 2022/0258317 A1, Aug. 18, 2022
Int. Cl. B25C 1/06 (2006.01); H02K 17/06 (2006.01); B25C 1/00 (2006.01)
CPC B25C 1/06 (2013.01) [B25C 1/008 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A tool having a working piston that moves along a working axis; a drive, for driving the working piston along the working axis, wherein the drive has an electrical capacitor; a squirrel-cage rotor arranged on the working piston; and an excitation coil, wherein current flows through the excitation coil during rapid discharge of the capacitor and generates a magnetic field that accelerates the working piston, wherein the tool has a frame of a soft-magnetic and electrically conducting material, which surrounds the excitation coil and extends in a circumferential direction with respect to the working axis, wherein the frame has one or more at least partial interruptions, which extend over a significant part of a radial extent of the frame with respect to the working axis.