Offset Flexible Hinge for Foldable Bed to Prevent Backrest Collapse
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Solution Overview
Problem
Conventional foldable beds face issues with an extended backrest height that creates rotational instability and requires a stopping mechanism, which can fail, leading to unexpected collapse into a bed position, and the design compromises aesthetics and user comfort.
Innovation Solution
An offset flexible hinge with a flexible connector connecting the backrest and seat, offset from the edge of the seat, allowing the seat to extend underneath the backrest, eliminating the need for a stopping mechanism and reducing the backrest height while maintaining a stable seating surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the backrest height is increased to allow the foldable bed to form a wider mattress, then the sleeping surface area is improved, but the gravitational force creates a rotational effect around the fulcrum that causes the backrest to collapse into the bed position
Solution Approach 1:
The hinge connection point is offset from the edge of the seat, creating an asymmetric connection geometry. This offset position changes the moment arm of the gravitational force acting on the backrest, reducing the rotational effect that causes collapse while still allowing the backrest to form a wide sleeping surface when extended.
Solution Approach 2:
The connection point is positioned in three-dimensional space at an offset location rather than at the edge, effectively using spatial dimensionality to alter the force distribution. This dimensional change allows the backrest to maintain stability through a different geometric configuration that reduces gravitational torque.
2Reliability
If a stopping mechanism is added to prevent the backrest from collapsing, then the backrest stability is improved, but the device complexity increases and the stopping mechanism can wear out or fail over time
Solution Approach 1:
The stopping mechanism is completely removed from the design. Instead of adding a complex mechanical stopping device, the offset hinge connection itself creates a geometric configuration that inherently prevents collapse, eliminating the need for separate stopping components and their associated complexity and maintenance issues.
Solution Approach 2:
The offset hinge connection provides self-stabilizing functionality through its geometric design. The offset position creates a natural mechanical advantage that passively prevents backrest collapse without requiring active control or additional components, allowing the structure to serve its own stabilization function.
3Area of stationary object
If the seat depth is increased to provide more seating surface, then the seating comfort is improved, but the backrest height must be extended further to maintain the same sleeping surface area, worsening the collapse issue
Solution Approach 1:
The offset hinge connection creates an asymmetric geometric relationship between the seat and backrest. This asymmetric configuration allows the seat depth to be increased independently while the offset position compensates for the changed geometry, maintaining both seating comfort and backrest stability without requiring extended backrest height.
Data Source
AI summary
An offset hinge for a foldable bed, including a flexible connector connected between a first section and a second section of the foldable bed with the flexible connector being connected to the second section at a connection point on a surface of the second section that is offset a distance from an edge of the second section.