Mechanical linkage structure for linking chair and seat, frame and chair having the mechanical linkage structure
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Solution Overview
Problem
Current mechanical linkage structures for folding deck chairs are complex and unstable, failing to meet requirements for simplicity and stability in operation.
Innovation Solution
A mechanical linkage structure comprising multiple links (first to seventh links) with pivotal connections and a limit mechanism, along with a tensioning mechanism using an elastic member, to facilitate smooth unfolding and folding while maintaining stability and alignment of cushion platforms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multi-link mechanism is used to realize the unfolding and folding of the seat part, then the chair can achieve extended functionality with additional support portions, but the structure becomes complicated and stability deteriorates
Solution Approach 1:
The seat structure is divided into multiple independent link components (first link, second link, third link, fourth link, fifth link, sixth link, seventh link) that can be separately manufactured and assembled. Each link performs a specific function in the unfolding/folding sequence, allowing the complex motion to be broken down into manageable segments that reduce overall structural complexity while maintaining versatility
2Adaptability or versatility
If a multi-link mechanism is used to realize the unfolding and folding of the seat part, then the chair can achieve extended functionality, but operational stability becomes poor
Solution Approach 1:
The pivotal connections between links provide inherent mechanical feedback through geometric constraints. As one link moves, it automatically guides the motion of subsequent links through fixed pivot points, ensuring stable and predictable operation. The limit mechanism further enhances this by providing feedback when extreme positions are reached, preventing over-travel and maintaining operational reliability
Solution Approach 2:
The mechanism transitions from a static structure to a dynamic system where links can pivot and rotate relative to each other. This dynamic capability allows the seat to smoothly transform between folded and unfolded states while maintaining stability during transition through controlled pivotal motion rather than rigid movement
3Ease of operation
If multiple links with pivotal connections are used, then smooth unfolding and folding motion is achieved, but the number of components and structural complexity increases
Solution Approach 1:
Multiple functional requirements are merged into a single integrated linkage mechanism. The same set of seven links simultaneously achieves smooth motion through pivotal connections, provides structural support, enables both unfolding and folding operations, and incorporates limit mechanisms all within one unified structure, rather than requiring separate mechanisms for each function
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 proposed structure simplifies the linkage mechanism, enhances stability, and ensures smooth operation by allowing controlled movement and alignment of cushion platforms during folding and unfolding, providing a stable and user-friendly experience.
Implementation Method 1
a tensioning mechanism configured to make the lying cushion connection platform and the front cushion connection platform flush with each other in a vertical direction when the mechanical linkage structure is in a collapsed state. Preferably, the tensioning mechanism comprises an elastic member, one end of the elastic member is connected to the fifth link, and the other end of the elastic member is connected the seventh link.
Implementation Method 2
The first link is pivotally connected to the second link and the third link, respectively; the second link is pivotally connected to the fourth link and the fifth link, respectively; the third link is pivotally connected to the fourth link, the fifth link, and the seventh link, respectively
Data Source
AI summary
A mechanical linkage structure for linking a chair and a seat, comprises a first link, a second link, and a third link respectively used as a driven link, a fourth link used as a driving link, a fifth link, a sixth link, and a seventh link respectively used as a driven link. The first link is pivotally connected to the second link and the third link, respectively; the second link is pivotally connected to the fourth link and the fifth link, respectively; the third link is pivotally connected to the fourth link, the fifth link, and the seventh link, respectively; the fifth link is pivotally connected to the sixth link; the sixth link is pivotally connected to the seventh link; the fourth link is driven to rotate the first link, the second link, the third link, the fifth link, the sixth link and the seventh link, to realize the unfolding or collapse of the mechanical linkage structure.