Capacitor Arrangement in Fastener Driving Tool
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Solution Overview
Problem
Existing setting tools for driving fastening elements into substrates lack efficiency and setting quality, particularly in ensuring effective transfer and safety during the driving process.
Innovation Solution
A setting tool with a capacitor arranged axially offset and radially overlapping the drive-in element, featuring a squirrel-cage rotor and excitation coil, which generates a magnetic field to accelerate the drive-in element, combined with a damping element and efficient electrical connections to enhance the driving mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the capacitor is arranged close to the drive-in element for efficient energy transfer, then the driving efficiency is improved, but the tilting moment increases causing instability
Solution Approach 1:
The capacitor is arranged radially around the drive-in element rather than axially adjacent to it, changing the spatial dimension of energy transfer. This radial arrangement maintains close proximity for efficient inductive coupling while positioning the capacitor's center of gravity on the setting axis, thereby eliminating tilting moments and improving stability during operation.
2Manufacturing precision
If the capacitor completely encloses the setting axis for omnidirectional energy distribution, then the setting quality is improved, but the device complexity increases
Solution Approach 1:
The capacitor utilizes a radially arranged flexible structure that can conformally enclose the setting axis. This flexible film-based design achieves omnidirectional energy distribution for high setting quality while maintaining a compact and relatively simple structure compared to rigid multi-component arrangements.
3Force
If the capacitor has low internal resistance for high current discharge, then the driving force is improved, but the heat generation increases
Solution Approach 1:
The capacitor is designed for periodic pulsed discharge rather than continuous operation. This allows the capacitor to deliver high current pulses with low internal resistance for maximum driving force, followed by recharge intervals that allow heat dissipation, thereby achieving high driving force while managing heat generation through time-based operation cycles.
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 tool ensures high efficiency and safety by effectively transferring fastening elements into substrates with reduced tilting moments and increased efficiency, while the capacitor's design minimizes recoil and enhances the overall setting quality.
Implementation Method 1
an electrical capacitor, which stores electrical charge and the associated energy in an electrical field
Implementation Method 2
the drive has an electrical capacitor and a coil. For driving the drive-in element, the capacitor is discharged via the coil, whereby a Lorentz force acts on the drive-in element
Implementation Method 3
the setting tool comprises a damping element, via which the capacitor is mounted in a damped manner on the rest of the setting tool. The damping element preferably dampens movements of the capacitor relative to the rest of the setting tool along the setting axis
Data Source
AI summary
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, which is arranged on the setting axis or around the setting axis.