Magnetically-Triggered Proximity Switch with Cross Arm Mechanism
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Solution Overview
Problem
Conventional magnetically-triggered proximity switches are limited in size due to the need for large contacts to accommodate high load values and complex actuation assemblies, restricting their use in applications with limited space and requiring external power sources.
Innovation Solution
A magnetically-triggered proximity switch design featuring a compact structure with a cross arm mechanism, where a second magnet moves between switch positions based on magnetic forces, allowing for reduced size and eliminating the need for external power, utilizing a cylindrical switch body made of high-temperature materials and hermetically sealed for protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional proximity switches use large contacts to accommodate high load values, then the load capacity is improved, but the device size increases
Solution Approach 1:
The proximity switch is divided into modular components including a sensor module with magnetic field detection elements and a separate actuation module with contacts. This segmentation allows the contacts to be optimized for load capacity while the sensor module remains compact, resolving the contradiction between large contact size and small device volume.
Solution Approach 2:
The patent transitions from mechanical contact actuation to magnetic field-based actuation, adding a new dimensional approach to the problem. By using magnetic fields to actuate contacts remotely, the system achieves high load capacity through properly sized contacts while maintaining a compact overall device structure, as the magnetic field generation and detection can be done in a small volume.
2Adaptability or versatility
If conventional proximity switches use complex actuation assemblies, then the switching functionality is improved, but the device size and manufacturing complexity increase
Solution Approach 1:
The patent replaces complex mechanical actuation assemblies with a magnetic field-based detection and actuation system. The sensor detects the target's position through magnetic field changes, and electronic control circuits manage the switching functionality, eliminating the need for complex mechanical linkages, springs, and levers while maintaining versatile switching capabilities.
Solution Approach 2:
The magnetic field sensor and electronic control system serve multiple functions: detecting target presence, determining target position, controlling contact actuation, and providing switching logic. This multi-functionality consolidates what would traditionally require separate mechanical components into a single integrated system, reducing device complexity while maintaining switching versatility.
3Reliability
If conventional proximity switches require external power sources, then the sensor operation is improved, but the application flexibility is reduced
Solution Approach 1:
The proximity switch incorporates energy-harvesting capabilities where the sensor system can harvest energy from the magnetic field interactions or from the target itself during movement. This self-service approach allows the sensor to operate reliably without external power sources, enabling deployment in applications where power availability is limited or where wireless operation is required.
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
Enables the use of proximity switches in space-constrained applications without external power, reducing manufacturing costs and time, while maintaining reliability and durability.
Implementation Method 1
the first magnet and the second magnet are selected to create a first magnetic force between the first magnet and the second magnet, and the first magnetic force maintains the cross arm in the first switch position
Implementation Method 2
the second magnet and a target outside of the switch body are selected to create a second magnetic force between the second magnet and the target, and the second magnetic force causes the cross arm to move from the first switch position to the second switch position if the second magnetic force is greater than the first magnetic force
Data Source
AI summary
A magnetically-triggered proximity switch includes a cylindrical switch body and a bias member non-movably secured within the switch body. The proximity switch also includes first and second normally-closed contacts and first and second normally-open contacts. The proximity switch further includes a spherical contact magnet disposed within the switch body, with the contact magnet being movable relative to the bias member from a first switch position and a second switch position. In the first switch position, an attraction to the bias member maintains the contact magnet in contact with the first and second normally-closed contacts, thereby completing a circuit between the first and second normally-closed contacts. In the second switch position, an attraction to a movable target external to the switch body moves the contact magnet into contact with the first and second normally-open contacts, thereby completing a circuit between the first and second normally-open contacts.