Setting tool

Patent metadata

Field	Value
Publication number	US-2021237244-A1
Application number	US-201917051933-A
Country	US
Kind code	A1
Filing date	May 29, 2019
Priority date	Jun 6, 2018
Publication date	Aug 5, 2021
Grant date	—

Abstract

A setting tool driving fastening elements, comprising a holder for a fastening element; a drive-in element transferring a fastening element in the holder into a substrate along a setting axis by a setting energy Ekin of at least 30 J and at most 600 J; a drive for driving the drive-in element toward the fastening element along the setting axis, the drive comprising a capacitor, a rotor on the drive-in element; and, an excitation coil, which during discharge of the capacitor is flowed through by current and generates a magnetic field accelerating the drive-in element toward the fastening element, the drive-in element having a piston diameter dK and a piston mass mK, and wherein, for dK,⅔(a+b Ekinn)≤dK≤4/3(a+b Ekinn)where a=33 mm, b=6 mmJ−n and n=⅓ and/or, for MK,⅔(c+d Ekinn)≤mK≤5/3(c+d Ekinn)where c=20 g, d=30 gJ−n and n=⅓.

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 by a setting energy E kin of at least 30 J and at most 600 J; 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 discharge of the capacitor and the excitation coil generates a magnetic field that accelerates the drive-in element toward the fastening element, wherein the drive-in element has a piston diameter d K and a piston mass m K , and wherein, for the piston diameter d K ,
⅔( a+b E kin n )≤ d K ≤4/3( a+b E kin n )
where a=33 mm, b=6 mmJ −n and n=⅓ and/or, for M K ,
⅔( c+d E kin n )≤ m K ≤5/3( c+d E kin n )

where c=20 g, d=30 gJ −n and n=⅓.

2 . The setting tool setting tool as claimed in claim 1 , wherein, for the piston diameter d K ,
4/5( a+b E kin n )≤ d K ≤6/5( a+b E kin n ).

3 . The setting tool as claimed in claim 1 , wherein, for the piston mass M K ,
4/5( c+b E kin n )≤ m K ≤7/5( c+b E kin n ).

4 . The setting tool as claimed in claim 1 , wherein a current intensity A coil of the current flowing through the excitation coil during the discharge of the capacitor has a time profile with a rising edge, a maximum current intensity A max and a falling edge, wherein the current intensity A coil rises during a current rise time Δt rise from 0.1 times to 0.8 times the maximum current intensity A max and during an impact time Δt impact is more than 0.5 times the maximum current intensity A max , and wherein the current rise time Δt rise is at least 0.020 ms and at most 0.275 ms and/or the impact time Δt impact is at least 0.15 ms and at most 2.0 ms.

5 . The setting tool as claimed in claim 4 , wherein the current rise time Δt rise is at least 0.05 ms and at most 0.2 ms and/or the impact time Δt impact is at least 0.2 ms and at most 1.6 ms.

6 . The setting tool as claimed in claim 1 , wherein a maximum current density in the excitation coil during the discharge of the capacitor is at least 800 A/mm 2 and at most 3200 A/mm 2 .

7 . The setting tool as claimed in claim 1 , wherein the capacitor and the excitation coil are arranged in an electrical oscillating circuit, and wherein the capacitor has a capacitance C cap and a capacitor resistance R cap , the excitation coil has a self-inductance L coil and a coil resistance R coil and the electrical oscillating circuit has a total resistance R total .

8 . The setting tool as claimed in claim 7 , wherein a ratio of the capacitor resistance R cap to the total resistance R total is at most 0.6, in particular at most 0.5.

9 . The setting tool as claimed in claim 7 , wherein a ratio of the self-inductance L coil to the coil resistance R coil is at least 800 μH/Ω and at most 4800 μH/Ω.

10 . The setting tool as claimed in claim 7 , wherein the capacitor has a capacitor time constant τ cap =C cap R cap and the excitation coil has a coil time constant τ coil =L coil /R coil , and wherein a ratio of the coil time constant τ coil to the capacitor time constant τ cap is at least 10.

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

12 . The setting tool as claimed in claim 2 , wherein a current intensity A coil of the current flowing through the excitation coil during the discharge of the capacitor has a time profile with a rising edge, a maximum current intensity A max and a falling edge, wherein the current intensity A coil rises during a current rise time Δt rise from 0.1 times to 0.8 times the maximum current intensity A max and during an impact time Δt impact is more than 0.5 times the maximum current intensity A max , and wherein the current rise time Δt rise is at least 0.020 ms and at most 0.275 ms and/or the impact time Δt impact is at least 0.15 ms and at most 2.0 ms.

13 . The setting tool as claimed in claim 3 , wherein a current intensity A coil of the current flowing through the excitation coil during the discharge of the capacitor has a time profile with a rising edge, a maximum current intensity A max and a falling edge, wherein the current intensity A coil rises during a current rise time Δt rise from 0.1 times to 0.8 times the maximum current intensity A max and during an impact time Δt impact is more than 0.5 times the maximum current intensity A max , and wherein the current rise time Δt rise is at least 0.020 ms and at most 0.275 ms and/or the impact time Δt impact is at least 0.15 ms and at most 2.0 ms.

14 . The setting tool as claimed in claim 2 , wherein a maximum current density in the excitation coil during the discharge of the capacitor is at least 800 A/mm 2 and at most 3200 A/mm 2 .

15 . The setting tool as claimed in claim 3 , wherein a maximum current density in the excitation coil during the discharge of the capacitor is at least 800 A/mm 2 and at most 3200 A/mm 2 .

16 . The setting tool as claimed in claim 4 , wherein a maximum current density in the excitation coil during the discharge of the capacitor is at least 800 A/mm 2 and at most 3200 A/mm 2 .

17 . The setting tool as claimed in claim 5 , wherein a maximum current density in the excitation coil during the discharge of the capacitor is at least 800 A/mm 2 and at most 3200 A/mm 2 .

18 . The setting tool as claimed in claim 8 , wherein a ratio of the self-inductance L coil to the coil resistance R coil is at least 800 μH/Ω and at most 4800 μH/Ω.

19 . The setting tool as claimed in claim 8 , wherein the capacitor has a capacitor time constant τ cap =C cap R cap and the excitation coil has a coil time constant τ coil =L coil /R coil , and wherein a ratio of the coil time constant τcod to the capacitor time constant τ cap is at least 10.

20 . The setting tool as claimed in claim 9 , wherein the capacitor has a capacitor time constant τ cap =C cap R cap and the excitation coil has a coil time constant τ coil =L coil /R coil , and wherein a ratio of the coil time constant τ coil to the capacitor time constant τ cap is at least 10.

Assignees

• Hilti Ag

Inventors

• Bruggmueller Peter
• Abu Antoun Chafic
• Dittrich Tilo

Classifications

• B25C1/06 Primary

  operated by electric power · CPC title

• B25C1/008

  Safety devices · CPC title

• H02K41/00

  Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path {(electromagnetic launchers F41B6/00)} · CPC title

• H02K2213/03

  Machines characterised by numerical values, ranges, mathematical expressions or similar information · CPC title