Nursing Bed Auxiliary Load-Bearing Layer to Prevent Fabric Deformation
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Solution Overview
Problem
Nursing beds with net-shaped fabrics face deformation and damage due to increased weight when patients change postures, leading to plastic elongation and loss of shape over time.
Innovation Solution
A nursing bed design featuring a semiautomatic washing function, incorporating a bed frame, net-shaped fabric, heat-insulation and water-draining bottom cover, auxiliary load-bearing layer with adjustable positioning, and interwoven strips to distribute weight evenly and prevent fabric stretch, ensuring the fabric's durability and shape retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the net-shaped fabric is used as the sole load-bearing structure, then the bed structure is simple, but the fabric undergoes plastic elongation and deforms when patients change postures
Solution Approach 1:
The load-bearing function is segmented between the net-shaped fabric and the auxiliary load-bearing layer. The auxiliary layer includes a rigid body portion and an elastic body portion with holes, dividing the support function to reduce stress on the fabric while maintaining structural simplicity.
Solution Approach 2:
The auxiliary load-bearing layer combines rigid and elastic materials to create a composite structure that distributes weight evenly. This composite approach prevents plastic elongation of the net-shaped fabric while keeping the overall bed structure relatively simple.
2Shape
If the auxiliary load-bearing layer is added to support the fabric, then the fabric shape is maintained, but the bed structure becomes more complex
Solution Approach 1:
The auxiliary load-bearing layer serves multiple functions: it supports the net-shaped fabric, distributes patient weight, and maintains fabric shape. The adjustable positioning structure also provides adaptability for different patient positions, consolidating multiple functions into one component to minimize added complexity.
Solution Approach 2:
The auxiliary load-bearing layer incorporates an elastic body portion that can dynamically adjust to patient movements and posture changes. The adjustable positioning structure allows the layer to be positioned at different distances from the fabric, enabling adaptation to various usage scenarios without requiring a completely different structure.
3Strength
If the auxiliary load-bearing layer is positioned close to the net-shaped fabric, then the support effect is enhanced, but the fabric is prone to plastic elongation under increased weight
Solution Approach 1:
The auxiliary load-bearing layer features a rigid body portion and an elastic body portion with holes, creating local variations in support characteristics. The rigid portion provides strong support where needed, while the elastic portion with holes allows for flexibility and breathability, distributing weight locally to prevent fabric elongation.
Solution Approach 2:
The distance between the auxiliary load-bearing layer and the net-shaped fabric is made adjustable, allowing the parameter of spacing to be optimized. This enables the system to achieve both strong support effect and prevention of plastic elongation by adjusting the distance according to specific usage requirements.
4Adaptability or versatility
If the hanging column is made adjustable in vertical direction, then the auxiliary load-bearing layer matches patient postures, but the positioning structure becomes more complex
Solution Approach 1:
The hanging column is designed to be independently adjustable in the vertical direction, allowing the auxiliary load-bearing layer to adapt dynamically to different patient postures (lying or sitting). This single adjustable element provides versatility without requiring a complex multi-component positioning system.
Data Source
AI summary
A nursing bed including a bed frame; a net-shaped fabric; a spray pipe; a heat-insulation and water-draining bottom cover; a base; an auxiliary load-bearing layer; and an auxiliary load-bearing frame. The heat-insulation and water-draining bottom cover is disposed at the lower part of the bed frame. At least two edges of the net-shaped fabric are hung between two opposite edges of the bed frame to form a mutual positioning structure. The auxiliary load-bearing layer is disposed beneath the net-shaped fabric. The grid support comprises a grid supporting surface beneath the net-shaped fabric, and the grid line width of the grid supporting surface is between 0.3 and 3 mm. The diameter of an inscribed circle of the holes is between 5 and 60 mm. The distance between the net-shaped fabric and the grid supporting surface exceeds 15 mm in an empty load state.