Working tool

Patent metadata

Field	Value
Publication number	US-2022258317-A1
Application number	US-202017615234-A
Country	US
Kind code	A1
Filing date	Jun 22, 2020
Priority date	Jul 4, 2019
Publication date	Aug 18, 2022
Grant date	—

Abstract

A tool having a working piston that moves along a working axis, a drive, for driving the working piston along the working axis, the drive having an electrical capacitor, a squirrel-cage rotor arranged on the working piston and an excitation coil, wherein current flows through the coil during rapid discharge of the capacitor and generates a magnetic field that accelerates the working piston, the tool having a frame of a soft-magnetic and electrically conducting material surrounding the excitation coil and extending in a circumferential direction with respect to the working axis, the frame having 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.

First claim

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.

2 . The tool as claimed in claim 1 , formed as a setting tool for driving fastening elements into a substrate, comprising a holder for holding a fastening element, wherein the working piston transfers a fastening element held in the holder into the substrate along the working axis, and wherein the drive drives the working piston onto the fastening element along the working axis.

3 . The tool as claimed in claim 1 , wherein the one or more at least partial interruptions extend up to an inner edge of the radial extent of the frame.

4 . The tool as claimed in claim 1 , wherein the one or more at least partial interruptions extend up to an outer edge of the radial extent of the frame.

5 . The tool as claimed in claim 1 , wherein the one or more at least partial interruptions extend up to an end edge of an axial extent of the frame with respect to the working axis.

6 . The tool as claimed in claim 1 , wherein the one or more at least partial interruptions pass completely through the frame.

7 . The tool as claimed in claim 1 , wherein the one or more at least partial interruptions are in the form of slits.

8 . The tool as claimed in claim 1 , wherein the one or more at least partial interruptions extend in the radial direction.

9 . The tool as claimed in claim 1 , wherein the one or more at least partial interruptions extend inclined in relation to the radial direction.

10 . The tool as claimed in claim 1 , wherein the one or more at least partial interruptions extend in an axial direction with respect to the working axis.

11 . The tool as claimed in claim 1 , wherein the one or more at least partial interruptions extend inclined in relation to an axial direction with respect to the working axis.

12 . The tool as claimed in claim 1 , wherein the frame is formed by multiple layers of the soft-magnetic and electrically conducting material, which are separated from one another by the one or more at least partial interruptions.

13 . The tool as claimed in claim 12 , wherein the layers of the soft-magnetic and electrically conducting material are stacked one on top of the other in a stacking direction, which is inclined in relation to the working axis.

14 . The tool as claimed in claim 12 , wherein the layers of the soft-magnetic and electrically conducting material are wound around a winding axis.

15 . The tool as claimed in claim 12 , wherein the layers of the soft-magnetic and electrically conducting material are substantially planar.

16 . The tool as claimed in claim 1 , comprising a hand-held tool.

17 . The tool as claimed in claim 13 , wherein the stacking direction is inclined at right angles in relation to the working axis.

18 . The tool as claimed in claim 14 , wherein the winding axis is oriented parallel to the working axis.

19 . The tool as claimed in claim 13 , wherein the layers of the soft-magnetic and electrically conducting material are wound around a winding axis.

20 . The tool as claimed in claim 13 , wherein the layers of the soft-magnetic and electrically conducting material are substantially planar.

Assignees

• Hilti Ag

Inventors

• Dittrich Tilo
• Heeb Norbert
• Kurth Emanuel
• Abu Antoun Chafic

Classifications

• B25F5/00

  Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for · CPC title

• B25C1/06 Primary

  operated by electric power · CPC title

• B25B27/02

  for connecting objects by press fit or detaching same {(B25D1/16 takes precedence)} · CPC title

• H02K7/14

  Structural association with mechanical loads, e.g. with hand-held machine tools or fans (with fan or impeller for cooling the machine H02K9/06) · CPC title

• H02K7/145

  Hand-held machine tool · CPC title