Magnetic Piston Retainer with Conductive Stops
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Solution Overview
Problem
Fastener-driving tools with magnetically retained pistons face challenges in achieving high retaining forces without mechanical destruction or degradation of components.
Innovation Solution
Designing the fastener-driving tool with magnetically conductive stops and an excitation magnet to maximize magnetic field lines passing through, using ferromagnetic materials and a permanent or electromagnet to generate high retaining forces, and incorporating a magnetically conductive foil to prevent demagnetization at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a magnet is used to retain the piston, then the piston can be held in position, but the retaining force is insufficient for high-performance applications
Solution Approach 1:
The retaining element is divided into multiple segments: an excitation magnet for generating the magnetic field, magnetically conductive stops for guiding and concentrating magnetic flux, and a mating piece for contacting the piston. This segmentation allows each component to be optimized for its specific function, achieving high retaining force through coordinated action rather than relying on a single magnet.
Solution Approach 2:
Magnetically conductive stops serve as intermediaries between the excitation magnet and the piston. These stops concentrate and guide magnetic field lines, enhancing the magnetic flux density in the retention zone. The stops act as magnetic flux concentrators that mediate the interaction between the magnet and piston, significantly improving retaining force without requiring direct contact between the magnet and piston.
2Speed
If the piston is retained with high magnetic force, then acceleration is improved, but mechanical destruction or degradation of components may occur
Solution Approach 1:
The magnetically conductive stops and mating piece act as intermediaries that distribute magnetic forces evenly across the piston surface. This prevents localized stress concentrations that could cause mechanical degradation. The intermediate structures provide a large contact area, spreading the high magnetic retaining force over the entire piston surface rather than concentrating it at single points.
Solution Approach 2:
The invention changes the magnetic field distribution parameters by using magnetically conductive stops with specific geometries. These stops are designed to concentrate magnetic flux in specific zones, creating a uniform pressure distribution on the piston. By optimizing the shape, size, and position of the stops, the magnetic field parameters are adjusted to achieve high retaining force without creating harmful stress concentrations.
3Force
If ferromagnetic materials are used for high retaining force, then magnetic retention is improved, but the materials may be susceptible to demagnetization at high temperatures
Solution Approach 1:
The retaining element uses composite construction combining different materials with complementary properties. The excitation magnet may use high-coercivity permanent magnet materials resistant to demagnetization, while the magnetically conductive stops use soft ferromagnetic materials optimized for flux conduction. This composite approach allows the system to achieve high retaining force through the ferromagnetic stops while the temperature-resistant magnet maintains field stability at elevated temperatures.
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 achieves high retaining forces with improved piston acceleration and reduced mechanical stress on components, allowing for efficient and reliable operation across various temperatures.
Implementation Method 1
a magnetic retaining element (5) having an excitation magnet (6) and at least two magnetically conductive stops (7, 8)
Implementation Method 2
the magnetization of which is oriented parallel to the axis A
Implementation Method 3
as many magnetic field lines from the excitation magnet as possible pass through the two stops and the contacting mating piece in a closed curve
Implementation Method 4
It is especially preferably a permanent magnet having a high magnetic field density
Data Source
AI summary
The invention relates to a fastening tool comprising a handheld housing with a piston element (1), which is received in the housing and which can be moved in a driven manner, for transmitting energy to a fixing element (3). The piston element (1) is guided in a cylinder (2) and can be accelerated towards the fixing element (3) by a drive force, and the piston element (1) can be held in a starting position by a magnetic force of a retaining element (5). The retaining element (5) has a first magnetically conductive stop (7) and a second magnetically conductive stop (8). The magnetic stops (7, 8) are connected by a magnetically conductive counter piece (9) arranged on a piston element when the piston element (1) is being held, and excitation magnet (6) is arranged between the magnetically conductive stops (7, 8).