Folding Chair Seat Locking for Stable Use and Compact Storage
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Solution Overview
Problem
Conventional folding furniture lacks a secure and efficient mechanism to transition between unfolded use positions and compact storage positions, often resulting in instability and difficulty in blocking unintended movement of the seat bottom.
Innovation Solution
A folding chair and bench design featuring retractable seat-bottom supports with gatefold leg units and seat-bottom retainers, which include locking mechanisms to securely align and lock the seat bottom in the unfolded position, utilizing hinges for pivoting movements to facilitate easy folding and storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional folding furniture is used without secure locking mechanisms, then the structure is simpler and easier to manufacture, but the stability and reliability of the seat bottom in use position deteriorates
Solution Approach 1:
The seat bottom is designed to automatically engage with the gatefold leg units and trigger the locking mechanism through its own weight and positioning action, without requiring external actuators or complex control systems. The user simply positions the seat bottom and the lock engages automatically.
Solution Approach 2:
A retainer component acts as an intermediary between the seat bottom and the gatefold leg units, providing the locking function. The retainer includes a lockable connection that secures the seat bottom to the leg units while allowing for easy release when needed.
2Reliability
If a secure locking mechanism is added to prevent unintended movement, then the reliability improves, but the ease of operation deteriorates due to additional locking steps
Solution Approach 1:
The locking and unlocking actions are designed to be triggered by the natural movements of the user or the furniture components themselves. The seat bottom's positioning automatically engages the lock, and simple manual manipulation releases it.
Solution Approach 2:
Instead of requiring active engagement to lock and passive release, the system is designed so that the locked state is the default stable state achieved through proper positioning, and release requires a deliberate simple action.
3Reliability
If the seat bottom is made fully fixed and non-folding, then the stability improves, but the adaptability and storage capability deteriorates
Solution Approach 1:
The connection between the seat bottom and gatefold leg units is designed to be dynamic rather than static - it transitions between a flexible connected state during folding and a rigid locked state during use, providing both adaptability and stability as needed.
Solution Approach 2:
The furniture is divided into separable components (seat bottom, gatefold leg units, retainers) that can be independently positioned and connected, allowing the system to transition between folded and unfolded configurations while maintaining stability in the deployed state.
4Adaptability or versatility
If retractable gatefold leg units are used to enable folding, then the adaptability improves, but the stability and ease of operation deteriorates due to lack of secure locking
Solution Approach 1:
The retainer serves as an intermediary locking component that secures the retractable gatefold leg units to the seat bottom in the deployed position, preventing unintended movement while allowing the folding function to operate when the retainer is released.
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 ensures stable and secure transition between unfolded and folded states, preventing unintended movement of the seat bottom and providing a compact storage solution, enhancing user convenience and furniture stability.
Implementation Method 1
The first gatefold leg unit is coupled to one side of the frame using a first hinge included in the folding chair
Implementation Method 2
A first seat-bottom retainer provides lock means for interconnecting one side of the seat bottom to the first gatefold leg unit to cause movement of the seat bottom to be blocked
Implementation Method 3
The first seat-bottom retainer also provides alignment means for aligning the seat bottom on the first gatefold leg unit to cause the lock means to be arranged so that a user may engage the lock means
Data Source
AI summary
A folding chair includes a frame, a seat bottom coupled to the frame, and legs for supporting the seat bottom in a horizontal position relative to the frame. The frame is formed to include a seat back.