Axial Load Cell Integrating Strain Gauges for Off-Center Weight Measurement
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Solution Overview
Problem
Conventional weight measurement tools pose challenges for wheelchair users, as they require assistance or trips to healthcare facilities for accurate weight tracking, leading to difficulties in maintaining a healthy lifestyle due to mobility impairments and lack of independent monitoring capabilities.
Innovation Solution
A plastic axial load cell apparatus with a base member, cap member, and strain gauges positioned to measure axial loads, integrated into a bed system for in-home weight monitoring, allowing for accurate and independent weight tracking by wheelchair users.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple cantilever beam load cells are positioned around the outside of the load cell assembly to correct accuracy deficiencies, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple sensing functions into a single integrated load cell assembly. The puck-shaped device integrates the load sensing mechanism with the support structure, eliminating the need for multiple separate cantilever beam load cells while maintaining measurement accuracy through careful design of the integrated components.
Solution Approach 2:
The load cell assembly is designed to perform multiple functions within a single device. The puck-shaped load cell serves both as the structural support element and as the measurement sensor, while also providing stability for off-center loads. This multi-functionality reduces the number of components needed compared to using multiple specialized cantilever beam load cells.
2Measurement precision
If conventional weight measurement tools are used, then measurement precision is maintained, but ease of operation deteriorates due to requiring assistance or trips to healthcare facilities
Solution Approach 1:
The load cell assembly enables wheelchair users to independently measure their weight without requiring assistance from healthcare providers or trips to specialized facilities. The integrated design allows the user to simply position themselves on the device, which automatically provides accurate measurement through its ability to handle off-center loads, making the service self-directed and accessible at home.
Solution Approach 2:
The load cell assembly creates an equipotential measurement surface that accommodates various positioning scenarios. By designing the support structure to provide stability for off-center loads, the device ensures that measurements remain accurate regardless of the user's position, eliminating the need for precise positioning or external assistance to achieve reliable results.
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 wheelchair users to independently and accurately track their weight, promoting healthier lifestyles by providing a cost-effective and accessible solution for in-home weight measurement, reducing the risk of obesity-related health issues.
Implementation Method 1
a plurality of strain gauges directly coupled to the number of first members, the plurality of strain gauges being positioned to measure an axial load applied to the load cell
Data Source
AI summary
A load cell apparatus includes a base member, a cap member, a number of first members provided between the base member and the cap member and forming at least a portion of a support wall of the load cell apparatus, and a plurality of strain gauges directly coupled to the number of first members, the plurality of strain gauges being positioned to measure an axial load applied to the load cell in a direction extending from the cap member to the base member.