Collapsible Weight Scale Using Bi-Stable Spring Bands
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Solution Overview
Problem
Conventional weight measurement tools, such as Broselow tapes and generic scales, are inaccurate for pediatric emergencies and impractical for use in ambulances due to their bulkiness and inability to be readily stored.
Innovation Solution
A portable weight measuring device with a top and bottom layer connected by bi-stable spring bands and force sensors, allowing shape transformation between planar and cylindrical forms, and equipped with a processor to calculate weight based on sensor signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional weight measurement tools (Broselow tape, generic scales) are used, then weight measurement function is provided, but measurement precision is insufficient and device portability is poor
Solution Approach 1:
The measuring device is divided into multiple flat segments connected by flexible bands, allowing the structure to collapse into a compact cylindrical form for portability while maintaining measurement functionality when deployed
Solution Approach 2:
The device transitions from a static generic scale design to a dynamic collapsible structure that can change shape between expanded measurement configuration and compact storage configuration, improving portability without sacrificing measurement precision
2Measurement precision
If generic weight measurement devices are used, then weight measurement capability is provided, but device complexity and storage requirements increase
Solution Approach 1:
The device uses multiple flat segments connected by flexible bands, allowing the structure to collapse into a compact cylindrical form for portability while maintaining measurement functionality when deployed
Solution Approach 2:
The device changes its physical configuration parameters (shape, volume) between operational and storage states, transitioning from an expanded planar measurement surface to a compact cylindrical storage form, reducing device complexity for storage while maintaining measurement capability
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
Provides accurate and portable weight measurements, overcoming the inaccuracies and practical limitations of existing tools by enabling precise dosing in emergency situations.
Implementation Method 1
The plurality of first flats are connected to each other via the at least one bi-stable spring band
Implementation Method 2
at least one force sensor interposed between the top layer and the bottom layer
Data Source
AI summary
A weight measuring device includes a top layer including a plurality of first flats and at least one bi-stable spring band. The plurality of first flats are connected to each other via the at least one bi-stable spring band. The weight measuring device further includes a bottom layer including a plurality second flats connected the plurality of first flats. The weight measuring device further includes at least one force sensor interposed between the top layer and the bottom layer. The weight measuring device further includes a processor configured to determine a weight of an object placed on the top layer or the bottom layer based on signals generated from the at least one force sensor.