Electromagnetic Setting Tool with Radial Pretensioning
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Solution Overview
Problem
Existing setting tools for driving fastening elements into substrates lack efficiency and setting quality, particularly in ensuring precise and effective transfer of fastening elements using electrical drives.
Innovation Solution
A setting tool with a holder, drive-in element, and drive that includes an electrical capacitor, short-circuit runner, and excitation coil, where the capacitor's discharge generates a magnetic field to accelerate the drive-in element, and a soft-magnetic frame is embedded within a supporting structure that applies a pretensioning force radially inward during discharge, enhancing the drive's efficiency and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a drive-in element is driven toward the fastening element using an electrical capacitor and coil to generate a magnetic field, then the setting speed and efficiency are improved, but the stability and precision of the drive-in element during acceleration are worsened
Solution Approach 1:
The patent applies preliminary anti-action by introducing a pretensioning force that acts radially inward on the soft-magnetic frame before and during the capacitor discharge. This pretensioning force counteracts the radially outward forces generated by the magnetic field acceleration, thereby preventing instability and ensuring precise control of the drive-in element throughout the acceleration process
Solution Approach 2:
The patent changes the physical state and parameters of the soft-magnetic frame by applying a pretensioning force that alters its mechanical stress state. This parameter change ensures the frame maintains its structural integrity and magnetic properties under the dynamic loading conditions during capacitor discharge, thereby improving both stability and precision
2Manufacturing precision
If a soft-magnetic frame is embedded in a supporting structure with pretensioning force, then the precision and control of the drive-in element are improved, but the device complexity increases
Solution Approach 1:
The patent merges the supporting structure with the soft-magnetic frame by embedding the frame within the structure and integrating the pretensioning mechanism into the same assembly. This merging reduces the number of separate components and simplifies the overall drive structure while maintaining the necessary precision and control functions
Solution Approach 2:
The supporting structure serves multiple functions: it provides mechanical support for the soft-magnetic frame, applies the pretensioning force radially inward, and maintains the geometric precision of the drive assembly. This multi-functionality reduces the need for additional specialized components, thereby improving setting quality without proportionally increasing complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures high efficiency and good setting quality by effectively transferring fastening elements into substrates with improved control and precision, utilizing a magnetic field and pretensioning force to enhance the drive-in process.
Implementation Method 1
an excitation coil, which during discharge of the capacitor is flowed through by current and generates a magnetic field that accelerates the drive-in element toward the fastening element
Implementation Method 2
the capacitor is discharged via the coil, whereby a Lorentz force acts on the drive-in element, so that the drive-in element is moved toward a nail
Implementation Method 3
the supporting structure exerts on the soft-magnetic frame a pretensioning force that is directed radially inward with respect to the setting axis
Data Source
AI summary
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; which during discharge of the capacitor is flowed through by current and generates a magnetic field that accelerates the drive-in element toward the fastening element, wherein the setting tool further comprises a soft-magnetic frame, in which the excitation coil is embedded; and a supporting structure; wherein, at least during the discharge of the capacitor, the supporting structure exerts on the soft-magnetic frame a pretensioning force directed radially inward with respect to the setting axis.