Rotatable Permanent-Magnet Base for Power-Failure-Safe Holding
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Solution Overview
Problem
Existing magnetic bases for power tools, such as magnetic core drilling machines, face issues with sudden loss of holding force during power failures, complexity in adjusting magnetic forces, and difficulty in use in confined spaces due to high design and limited material compatibility, leading to safety risks and operational challenges.
Innovation Solution
A magnetic base design where first and second permanent magnets are rotatably mounted about their own axes between positions for maximum and minimum holding force, allowing easy adjustment by 90° rotation, with a compact construction and uniform force distribution, facilitated by a coupling mechanism and alternating magnet arrangement for enhanced usability in spatially restricted conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electromagnets are used to provide magnetic holding force, then the holding force can be controlled and adjusted, but the holding force abruptly decreases during power failure causing safety risks
Solution Approach 1:
The patent extracts the electrical power dependency from the magnetic holding system by using permanent magnets instead of electromagnets. The permanent magnets provide magnetic holding force without requiring electrical power, eliminating the safety risk of abrupt holding force loss during power failures while maintaining reliable and controllable holding force through mechanical orientation adjustment.
Solution Approach 2:
The permanent magnets serve themselves by providing magnetic holding force autonomously without external power supply. The system uses the inherent magnetic properties of the permanent magnets to maintain holding force, and the user can control the holding force magnitude by adjusting the orientation of the permanent magnets mechanically.
2Volume of moving object
If permanent magnets are used with mechanical rotation for adjustment, then the system becomes compact and portable, but the adjustment becomes difficult in confined spaces
Solution Approach 1:
The patent divides the magnetic base into multiple permanent magnets that can be independently oriented. Each permanent magnet can be rotated about its own axis separately, allowing fine-grained control of the magnetic field distribution. This segmentation enables compact design while maintaining ease of adjustment, as each magnet can be oriented independently to achieve desired holding force without requiring large adjustment movements.
Solution Approach 2:
The permanent magnets are designed to be rotatable about their own axes, providing dynamic adjustment capability. This rotational freedom allows the magnets to be reoriented easily even in confined spaces, maintaining ease of operation while achieving a compact magnetic base design that can be adapted to various workpiece geometries.
3Force
If multiple permanent magnets are arranged to maximize holding force, then the magnetic base becomes too high for cramped conditions, but reducing height limits the holding force
Solution Approach 1:
The patent applies local quality by allowing each permanent magnet to have its own independent orientation rather than requiring a uniform tall structure. Each magnet can be oriented locally to contribute optimally to the holding force in its specific position, enabling the magnetic base to achieve maximum holding force with a compact height suitable for cramped working conditions.
4Adaptability or versatility
If the magnetic base is designed for thin workpieces, then the holding force becomes insufficient for secure fastening, but increasing holding force requires more material thickness
Solution Approach 1:
The patent uses dynamic orientation adjustment of multiple permanent magnets to adapt the magnetic field distribution to different workpiece thicknesses. By rotating the permanent magnets about their axes, the user can optimize the magnetic field penetration and holding force for the specific workpiece thickness, enabling secure fastening across a wide range of thicknesses from thin to thick workpieces.
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 provides a reliable and easy-to-operate magnetic base that maintains a strong holding force even on thin workpieces, simplifies adjustments, and ensures safety by eliminating the need for complex gear structures and electrical power, while being adaptable to various workpiece geometries.
Implementation Method 1
at least one first permanent magnet and at least one second permanent magnet are accommodated, the magnetic forces of which interact to form a resulting holding force
Data Source
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AI summary
The invention relates to a magnetic base (1) for a power tool, in particular for a magnetic core drilling machine, comprising a base body (2) which has a contact surface (3) for contacting a workpiece (8) to be machined and in which at least one first permanent magnet (4) and at least one second permanent magnet (5) are accommodated, the magnetic forces of which interact to produce a resulting holding force. The at least one first permanent magnet (4) and the at least one second permanent magnet (5) are each rotatably mounted in the base body (2) about their own axis of rotation (7) between a first position in which the resulting holding force of the magnetic base (1) is maximized and a second position in which the resulting holding force of the magnetic base (1) is minimized.