Elastic Mesh Backrest Chair for Body-Wrapping Head Support
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Solution Overview
Problem
Conventional backrest chairs with rigid frame members fail to provide comfort by not allowing the head to lean backward relative to the shoulders and do not wrap around the body effectively when a load is applied, leading to a strained sitting experience.
Innovation Solution
A backrest chair constructed with a core sheet made of mesh sheets and shape retaining materials capable of elastic bending deformation, combined with a buffer sheet, which is attached to a chair support frame below the seat surface, allowing the backrest to elastically displace and support the body while enabling the head to lean backward, and the backrest to wrap around the body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigid frame members are used to construct the backrest, then structural strength is improved, but comfort and body wrapping capability deteriorate
Solution Approach 1:
The backrest uses a flexible sheet material that can wrap around the user's body, replacing the conventional rigid frame structure. This flexible sheet maintains structural integrity while providing conformability and comfort, directly resolving the contradiction between strength and ease of operation.
Solution Approach 2:
The invention employs composite material construction for the backrest, combining materials that provide both structural strength and flexibility. This allows the backrest to maintain rigidity where needed while remaining conformable to the body, addressing both strength and comfort requirements simultaneously.
2Device complexity
If the head support portion is integrated with the backrest, then structural simplicity is improved, but head mobility relative to shoulders deteriorates
Solution Approach 1:
The flexible sheet material enables dynamic movement between the head support portion and the main backrest. When the user moves their head, the sheet material deforms to allow independent head movement while maintaining connection to the backrest, resolving the contradiction between structural simplicity and adaptability.
3Quantity of substance
If cushioning materials are attached only to contact portions, then material usage is reduced, but body wrapping capability deteriorates
Solution Approach 1:
The flexible sheet material itself provides the wrapping capability without requiring additional cushioning materials. The sheet conforms to the body contours through its flexibility, eliminating the need for separate cushioning layers while maintaining full body contact and comfort.
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 solution provides a comfortable sitting experience by allowing the backrest to softly support the entire body and enable the head to lean back relative to the shoulders, while being easy to manufacture and assemble at a low cost.
Implementation Method 1
a core sheet is formed by attaching a shape retaining material capable of elastic bending deformation to mesh sheets capable of elastic bending deformation, to have an elastic resilience for assuming a backrest shape in a natural state and to be elastically displaceable while maintaining a backrest state by a stretching force in a use situation
Data Source
AI summary
[Problem] To provide a comfortable backrest chair.[Solution] A shape retaining material is formed to have radial cores 12 distributed and radially extending upward from a base plate adjacent a cut hole 4 to be fitted on a chair support frame, and a first and a second reinforcing cores 13 and 14 arranged adjacent the base plate of the radial cores 12. A core sheet is formed by attaching a first, a second and a third mesh sheets 9 to the shape retaining material. A chair sheet material is formed by attaching a first and a second buffer sheets 15 and 16 and an outer surface side buffer sheet 7 to the core sheet. A backrest portion of the chair sheet material is constructed to have a larger right and left width than the breadth of a seated person's shoulders, and when the load of the seated person is applied, right and left opposite ends of the backrest portion can be displaced in directions to approach each other due to elasticity of the core sheet. An upper extending part of the backrest portion is capable of supporting the head of the seated person, and bending to move further rearward than the backrest portion due to the elasticity of the core sheet.