Magnetic Field Grip Strength Sensor Design
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Solution Overview
Problem
Existing grip strength measuring devices are limited in accuracy as they only measure the grip strength of the thumb and index finger, leading to reduced measurement accuracy when the grip is not accurately applied.
Innovation Solution
A device that includes a basis and a cover forming an enclosed pressure space, with a cap creating a sensing space and using magnets and a magnetic sensor to detect changes in the magnetic field caused by grip strength, allowing for accurate measurement of hand grip strength across multiple fingers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If force sensors are attached to measure only thumb and index finger, then the device structure is simple, but measurement precision is reduced
Solution Approach 1:
The patent replaces traditional mechanical force sensors with a magnetic field-based sensing system. Magnets are mounted on the cap while magnetic sensors are mounted on the basis, creating a non-contact magnetic coupling system. This substitution eliminates the need for direct mechanical contact sensors, allowing accurate measurement of grip strength from multiple fingers while maintaining structural simplicity.
Solution Approach 2:
The magnetic field sensing system provides universal measurement capability across all fingers of the hand, not just the thumb and index finger. The magnetic sensors can detect grip strength from any finger that applies force to the cap, making the device universally applicable for comprehensive hand grip measurement.
2Measurement precision
If multiple fingers are measured simultaneously, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The magnetic field-based sensing system enables simultaneous measurement of multiple fingers without requiring separate sensors for each finger. The magnetic field naturally distributes across the cap surface, allowing any finger applying force to be detected by the magnetic sensors on the basis, thereby achieving multi-finger measurement with minimal additional complexity.
Solution Approach 2:
The magnetic field acts as an intermediary between the cap and the sensors, transmitting force information from multiple fingers simultaneously. This intermediary mechanism allows the system to capture grip strength from any finger without direct mechanical coupling, simplifying the device structure while improving measurement accuracy.
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 device ensures ease and accuracy in measuring grip strength by sensing magnetic field changes, enabling precise measurement of hand grip strength applied by multiple fingers.
Implementation Method 1
magnets mounted on the cap or the basis to form a magnetic field in the sensing space; and a magnetic sensor mounted on the cap or the basis to detect change in the magnetic field formed by the magnet
Implementation Method 2
an outer shape of the cover is elastically changed by grip strength
Data Source
AI summary
The present invention relates to a device for measuring grip strength including a basis; a cover coupled to the basis to form an enclosed pressure space separated from the outside; a cap disposed between the basis and the cover and configured to form a sensing space separated from the pressure space; magnets mounted on the cap or the basis to form a magnetic field; and a magnetic sensor for detecting change in the magnetic field. With this configuration, when measuring the grip strength of the user's hand, accuracy or sensitivity may be increased.