Foldable Backrest with Movable Rigid Wedges for Angle Adjustment
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Solution Overview
Problem
Existing seating devices and backrests fail to provide comfortable support for various angles while keeping hands free for activities, as they often require rigid frames that limit design freedom and comfort, and inflatable devices are cumbersome and prone to air loss.
Innovation Solution
A foldable backrest with a pivotally connected backrest plate and support plate, featuring movable rigid wedges that allow adjustable angles between the plates, enabling comfortable sitting or lying in various positions without the need for hands to support the backrest, and can be easily carried as a backpack.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid frame is used in a backrest, then structural strength is improved, but design freedom and comfort are worsened
Solution Approach 1:
The backrest is divided into multiple rigid segments (first backrest segment, second backrest segment, third backrest segment) connected by pivot connections. This segmentation allows each segment to be independently positioned at different angles, providing design freedom while maintaining structural strength through rigid individual segments.
Solution Approach 2:
The backrest segments are connected through pivot connections that allow dynamic adjustment of angles. The rigid segments can be positioned at different angular orientations relative to each other, enabling the backrest to adapt to different user preferences and activities while maintaining structural integrity.
2Strength
If a rigid frame is used in a backrest, then structural strength is improved, but comfort for leaning is worsened
Solution Approach 1:
The backrest is segmented into multiple rigid sections that can be independently angled. This allows the upper portions to be positioned at more comfortable angles for leaning and head support, while the lower portions maintain structural strength through their rigid construction and connection to the support plate.
Solution Approach 2:
The pivot connections between rigid segments enable dynamic positioning of each segment to optimize comfort. Users can adjust the angle of each segment to achieve comfortable leaning positions, particularly for head and back support, while the rigid segments themselves maintain structural strength.
3Stability of the object's composition
If an inflatable device is used, then structure is formed, but reliability is worsened due to air loss
Solution Approach 1:
The patent replaces the inflatable system with a mechanical system consisting of rigid segments connected by pivot connections. This mechanical structure inherently maintains its shape and support properties without relying on air pressure, eliminating the reliability issues associated with air loss while still providing the necessary structural formation for sitting and leaning.
4Stability of the object's composition
If a square frame is used in a sitting device, then structural stability is improved, but ease of carrying is worsened
Solution Approach 1:
The backrest is divided into multiple separable rigid segments connected by pivot connections. This segmentation allows the structure to be folded into a compact configuration for easy carrying, while maintaining structural stability when deployed. The segments can be collapsed together like an accordion, significantly reducing the carrying footprint compared to a rigid square frame.
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 foldable backrest allows for versatile angle adjustments, maintains hand accessibility, and is structurally robust to support high pressures, making it comfortable and practical for outdoor or indoor use on various surfaces.
Implementation Method 1
One or more movable rigid wedges configured to transfer mechanical support to the backrest plate from a surface on which support plate is positioned
Implementation Method 2
One or more movable rigid wedges configured to form a desired angle between the backrest plate and the support plate
Data Source
AI summary
a foldable backrest, including a backrest plate, operatively configured to be leaned upon by a back of a user. A support plate pivotally connected to the backrest plate operatively configured to be placed on a surface on which a user desires to sit or lay down on. One or more movable rigid wedges configured to form a desired angle between the backrest plate and the support plate in respect to the pivot connection between the backrest plate and the support plate. One or more wedge-stopping means for fixing the movable rigid wedge in a position for forming the desired angle. The one or more movable rigid wedge(s) configured to transfer mechanical support to the backrest plate from a surface on which support plate is positioned when the rigid wedge is fixed in a desired position by the wedge-stopping means.