Dual-Layer Foam Massage Roller with Variable Compression
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Solution Overview
Problem
Existing massage rollers with high surface hardness are unsuitable for users with pain, as they cause additional pain and muscle contraction, limiting their therapeutic effectiveness.
Innovation Solution
A massage roller with an inner area of higher crush-resistant foam surrounded by a softer outer area, allowing adjustable compressive strength and reduced weight, enabling gentle yet effective muscle stimulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a high surface hardness massage roller is used, then the structural stability and durability are improved, but the user comfort and therapeutic effectiveness deteriorate due to additional pain and muscle tension
Solution Approach 1:
The massage roller is designed with a two-layer foam structure where the inner area has higher compression strength than the outer area. This local differentiation allows the outer surface to be soft and gentle on the skin while the inner core provides structural stability and durability, resolving the contradiction between user comfort and structural integrity
Solution Approach 2:
The massage roller combines two different foam materials with different compression strengths into a single composite structure. The inner area uses high compression strength foam for stability, while the outer area uses lower compression strength foam for comfort, achieving both structural requirements and therapeutic effectiveness
2Object-affected harmful factors
If the compression strength of the outer area is reduced for gentler treatment, then the user comfort is improved, but the support and stability during rolling motion deteriorate
Solution Approach 1:
The outer area is designed with lower compression strength to provide gentle contact and comfort for users with pain, while the inner area maintains high compression strength to provide the necessary support and stability during rolling motion, eliminating the need to compromise either comfort or stability
Solution Approach 2:
The massage roller employs a nested structure where the outer foam area (lower compression strength) completely surrounds the inner foam area (higher compression strength). This nesting allows the softer outer layer to provide comfort while the harder inner core maintains structural stability and rolling performance
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 design allows for gentle and effective muscle stimulation, suitable for users with pain, reducing muscle contraction and enhancing therapeutic outcomes by adjusting compressive strength and maintaining material integrity.
Implementation Method 1
the foam of the inner area having a higher compression strength than the foam of the outer area
Implementation Method 2
the inner and outer areas are bonded together by a material-bonded connection
Data Source
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Figure 5
AI summary
Massage roller comprising an inner area and an outer area, wherein the inner and outer areas are made of foam, wherein the outer area completely surrounds the inner area around a longitudinal axis and is bonded to the inner area, wherein the foam of the inner area has a higher compression strength than the foam of the outer area, wherein the contact surface between the inner and outer areas is cylindrical.