Fastener driving tool

Patent metadata

Field	Value
Publication number	US-2021229251-A1
Application number	US-201917051651-A
Country	US
Kind code	A1
Filing date	May 29, 2019
Priority date	Jun 6, 2018
Publication date	Jul 29, 2021
Grant date	—

Abstract

A setting tool for driving fastening elements into a substrate comprises a holder for holding a fastening element; a drive-in element for transferring a fastening element held in the holder into the substrate along a setting axis; and, a drive for driving the drive-in element toward the fastening element along the setting axis, wherein the drive comprises an electrical capacitor; a squirrel-cage rotor arranged on the drive-in element; and, an excitation coil, which during rapid discharge of the capacitor is flowed through by current and generates a magnetic field that accelerates the drive-in element toward the fastening element, and wherein the setting tool has a control unit, which is suitable for carrying out a fuse discharge of the capacitor during which current does not flow through the excitation coil.

First claim

1 . A setting tool for driving fastening elements into a substrate comprising a holder for holding a fastening element; a drive-in element for transferring a fastening element held in the holder into the substrate along a setting axis; and, a drive for driving the drive-in element toward the fastening element along the setting axis, wherein the drive comprises an electrical capacitor; a squirrel-cage rotor arranged on the drive-in element; and, an excitation coil, wherein current flows through the electrical capacitor during rapid discharge of the capacitor and the excitation coil generates a magnetic field that accelerates the drive-in element toward the fastening element, and wherein the setting tool has a control unit suitable for carrying out a fuse discharge of the capacitor while current does not flow through the excitation coil.

2 . The setting tool as claimed in claim 1 , wherein the control unit can be operated in a normal mode and in a backup mode, and wherein the control unit is suitable for performing a quick discharge in the normal mode and for performing the fuse discharge in the backup mode.

3 . The setting tool as claimed in claim 1 , wherein the drive has a switching circuit, which comprises a discharge switch, the control unit being suitable for closing the discharge switch in the normal mode in order to bring about the rapid discharge, and the control unit comprises a fuse switch and is suitable for closing the fuse switch in the backup mode in order to bring about the fuse discharge.

4 . The setting tool as claimed in claim 2 , wherein the setting tool has a detection means for detecting a state parameter of the setting tool, and wherein the control unit is intended to go into backup mode in when the state parameter is detected.

5 . The setting tool as claimed in claim 4 , wherein the setting tool has a means for detecting a period of time during which the capacitor is already electrically charged, and wherein the detected state parameter comprises the detected period of time.

6 . The setting tool as claimed in claim 4 , wherein the setting tool has a means for detecting a mechanical load variable, and wherein the detected state parameter comprises the detected load variable.

7 . The setting tool as claimed in claim 4 , wherein the setting tool has a means for detecting a charging voltage of the capacitor, and wherein the detected state parameter comprises the charging voltage of the capacitor.

8 . The setting tool as claimed in claim 7 , wherein the control unit is intended to go into backup mode when the charging voltage of the capacitor exceeds a predetermined limit voltage.

9 . The setting tool as claimed in claim 4 , wherein the setting tool has a means for detecting a temperature of a surrounding area and/or of the setting tool, the detected state parameter comprising the detected temperature.

10 . The setting tool as claimed in claim 4 , wherein the setting tool has a means for detecting a removal of a component of the setting tool, the detected state parameter being the absence of the component of the setting tool.

11 . The setting tool as claimed in claim 1 , wherein the control unit has an electrical resistor, wherein, during the fuse discharge of the capacitor, current flows through the electrical resistor.

12 . The setting tool as claimed in claim 11 , wherein the electrical resistor comprises a resistor network.

13 . The setting tool as claimed in claim 1 , wherein the setting tool has an electric battery, wherein, during the fuse discharge of the capacitor current flows through the electric battery and the battery is charged.

14 . The setting tool as claimed in claim 13 , wherein the control unit comprises a bidirectional switching converter, which converts a battery current into a capacitor charging current for a charging of the capacitor and converts a discharging current of the capacitor into a battery charging current for the fuse discharge of the capacitor.

15 . The setting tool as claimed in claim 14 , wherein the bidirectional switching converter comprises one or more rectifier switches, which are closed in order to bring out about the fuse discharge.

16 . The setting tool of claim 1 , comprising a hand-held setting tool.

17 . The setting tool of claim 6 , wherein the means for detecting the mechanical load variable detects an acceleration of the setting tool, and the detected state parameter comprises an acceleration of the setting tool.

18 . The setting tool of claim 9 , wherein the means detects the temperature of the excitation coil.

19 . The setting tool of claim 10 , wherein the means detects a housing part or an electric battery.

20 . The setting tool as claimed in claim 5 , wherein the control unit has a means for detecting a period of time during which the capacitor is already electrically charged, and wherein the detected state parameter comprises the detected period of time.

Assignees

• Hilti Ag

Inventors

• Dittrich Tilo
• Heeb Norbert
• Friewald Kai

Classifications

• B25C5/15

  operated by electric power · CPC title

• B25C1/06 Primary

  operated by electric power · CPC title