Flexible Circumference Measuring Device with Localized Connecting Means
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Solution Overview
Problem
Existing devices for measuring limb circumference are not versatile and suffer from significant measurement errors, especially for limbs with small or large circumferences and irregular curvatures, leading to inaccurate and non-reproducible results due to their fixed curvature and operator-dependent positioning.
Innovation Solution
A device with a connecting means located on the winder's wall adjacent to the exit opening, allowing the measuring element to form a loop in a single plane, minimizing bias and enabling accurate, reproducible measurements regardless of limb shape or operator positioning, with a flexible measuring element and optional electronic module for digital display and tension control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed curvature measuring device is used, then the device structure is simple, but measurement accuracy deteriorates for limbs with different curvatures
Solution Approach 1:
The measuring device incorporates a flexible measuring element that can dynamically adapt to different limb curvatures rather than maintaining a fixed rigid structure. The element can bend and conform to the specific geometry of the limb being measured, allowing the same device to accurately measure various limb sizes and shapes without requiring multiple specialized devices.
2Ease of operation
If the connecting means is located far from the exit opening, then the operator has more space to manipulate the measuring element, but measurement accuracy deteriorates due to increased positioning errors
Solution Approach 1:
The connecting means is positioned locally adjacent to the exit opening of the winder, creating a concentrated zone of control right where the measuring element emerges. This local positioning allows the operator to precisely control the starting point of the measuring element on the limb, minimizing positioning errors while still providing adequate manipulation space through the loop formation process.
3Device complexity
If the operator holds the tape measure in place manually, then no additional device components are needed, but measurement reliability deteriorates due to operator movement and distortion
Solution Approach 1:
The measuring device is designed to be self-positioning and self-holding through its mechanical structure. The winder mechanism automatically maintains tension and positioning of the measuring element around the limb, eliminating the need for continuous manual holding. The device structure itself provides the stability and restraint needed to prevent operator movement from distorting the measurement.
4Ease of manufacture
If a simple tape measure is used, then the device is easy to manufacture, but measurement precision deteriorates due to lack of structural support
Solution Approach 1:
The measuring device is segmented into distinct functional components: a winder mechanism for controlled dispensing, a flexible measuring element with graduations, and a connecting means for securing the loop. This segmentation allows each component to be optimized for its specific function while maintaining overall manufacturing simplicity. The structured design provides the structural support needed for precision without excessive complexity.
Data Source
AI summary
The present invention relates to a device for measuring an object, comprising a winder of a measuring element arranged to form a loop about the said object, which has at least one wall and an exit opening arranged to allow the exit of at least one unwound portion of the said measuring element, which is defined between the said exit opening and a distal end of the said measuring element, which is provided with a connecting element that abuts against the said exit opening, and a connecting means being located at a distance d from the said exit opening, characterised in that the said connecting means is located on the said at least one wall, is adjacent to the said exit opening, is presented in the form of a protrusion which extends towards the said distal end, and is arranged to receive the said connecting element in a stationary manner.