Offset Pyramid Hinge Folding Chair With Snap-Lock Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing folding chairs lack a user-friendly internal collapse mechanism, require extensive user manipulation, and often involve complicated locking mechanisms or separate parts for assembly, making them cumbersome for easy operation, storage, and transportation.
Innovation Solution
A foldable chair design utilizing an offset pyramid hinge with flexible connections, allowing for minimal user effort to open and close, featuring a pyramid geometry with offset axes that impart torsional forces to create a snapping effect for stable and sturdy positions, and can be made from lightweight yet durable flexible materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional folding chair mechanisms are used, then the chair can be folded for storage, but the folding mechanism becomes complicated and requires extensive user manipulation
Solution Approach 1:
The chair structure is divided into four separate support members forming a pyramid geometry, with each member independently hinged to the others. This segmentation allows the complex folding action to be distributed across multiple simple hinge joints rather than requiring a single complex mechanism, reducing both device complexity and user manipulation requirements
Solution Approach 2:
The offset pyramid hinge structure utilizes the geometric relationships between its four support members to automatically guide the folding and unfolding motions. The torsional forces generated by the offset axes create a self-regulating mechanism that naturally progresses through folding stages without requiring user intervention, making the system self-servicing during operation
2Ease of operation
If traditional folding mechanisms are used, then the chair can collapse, but complicated locking mechanisms are required to maintain open position
Solution Approach 1:
The offset pyramid hinge structure generates torsional forces that naturally lock the chair in its open position through the geometric constraints of the four support members. The intersecting axes create a stable configuration that resists collapse without requiring external locking mechanisms, while still allowing easy transition to the folded position when force is applied
Solution Approach 2:
Instead of using locking mechanisms to prevent collapse, the design inverts the approach by using the collapse tendency itself as the locking mechanism. The offset geometry creates inherent instability in intermediate positions that naturally drives the structure toward either fully open or fully closed states, eliminating the need for separate locking components
3Strength
If rigid materials are used for folding chair, then the chair is durable, but the chair becomes heavy and difficult to transport
Solution Approach 1:
The patent utilizes thin-walled tubular members that provide high strength-to-weight ratio. The cylindrical geometry of the support members distributes stresses efficiently while using minimal material, achieving both durability and light weight. The thin-walled construction allows the structure to be lightweight yet resistant to deformation under normal loading conditions
4Ease of manufacture
If simple geometric patterns are used, then the chair is easy to manufacture, but the chair lacks stability and sturdiness in open position
Solution Approach 1:
The patent transitions from planar folding geometries to a three-dimensional pyramid configuration. This dimensional change provides inherent stability through the spatial arrangement of the four support members, creating a rigid tetrahedral structure when open. The offset axes add another layer of geometric complexity that enhances stability while still allowing simple hinge connections for ease of manufacture
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 offset pyramid hinge enables easy operation, stable, and sturdy open positions with minimal exertion, and efficient folding into a transport or storage position, reducing the need for complicated locking mechanisms and separate parts, while maintaining rigidity and comfort.
Implementation Method 1
While it has been desirable to avoid torsional forces or other stresses in the design of a folding chair or other support structure, and it is an object of the present invention to impart torsional forces and/or other stresses to create a snapping effect which can dispose the chair to an open position, a closed position, or both
Data Source
AI summary
A folding chair having at least one offset pyramid hinge, two chair legs, a chair-backing, and a seating member which can fold substantially flat in a closed position, and can substantially lock open in an opened position. The offset hinge of the chair promotes the chair remaining in either a flattened or open position by positioning the intersecting junctions at apices which are offset from one another.