Zero-Wall Chair Frame with Linkage-Driven Backrest Clearance
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Solution Overview
Problem
Existing chair frames with zero-gravity and zero-wall capabilities face interference with walls during position transformation, occupy excessive space, and have complex structures and high production costs, leading to jamming issues.
Innovation Solution
A chair frame design featuring a base, seat side plate assembly, first and second linkage assemblies, a driving mechanism with a magnetically coupled rodless cylinder, and a backrest assembly, allowing for smooth adjustment and zero-wall clearance by using a first driving rod connected to the seat side plate and ottoman assembly, and a second linkage assembly that articulates with the base and seat side plate to facilitate movement away from the wall.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the chair is placed close to the wall to save space, then the space occupancy is reduced, but the backrest assembly interferes with the wall during position transformation
Solution Approach 1:
The second linkage assembly is designed to preliminarily move the backrest assembly away from the wall before the main position transformation occurs. This preliminary action prevents the backrest from interfering with the wall during the subsequent transformation from closed to zero-gravity position, enabling the chair to be placed close to the wall while maintaining smooth position conversion.
2Ease of operation
If a traditional driving mechanism is used, then the position transformation can be achieved, but the structure becomes complex and production cost increases
Solution Approach 1:
The first and second linkage assemblies are merged with the driving mechanism to form an integrated system. The first driving rod connects both linkage assemblies, allowing a single driving action to simultaneously control the ottoman assembly and the backrest assembly movements. This merging reduces structural complexity and production costs while maintaining smooth position transformation capability.
Solution Approach 2:
The linkage assemblies serve multiple functions: they drive the ottoman assembly movement, control the backrest assembly movement, and enable both closed and zero-gravity positions. This multi-functionality reduces the need for separate mechanisms, simplifying the overall structure and reducing production costs.
3Ease of manufacture
If the chair structure is simplified to reduce production cost, then manufacturing becomes easier, but the chair is prone to jamming during position conversion
Solution Approach 1:
The linkage assemblies are designed with dynamic geometric relationships that automatically adjust during position transformation. The articulated connections and linkages maintain optimal angles and clearances throughout the movement range, preventing jamming while keeping the structure simple and cost-effective to 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 design enables convenient and quick position adjustments, saves power source requirements, prevents backrest interference with walls, reduces space occupancy, and enhances user experience by allowing zero-wall clearance placement and smoother position conversions.
Implementation Method 1
a magnetically coupled rodless cylinder
Implementation Method 2
The driver comprises a cylinder, a piston arranged inside the cylinder and a slider sleeved outside the cylinder and slidingly connected with the cylinder
Data Source
AI summary
The present disclosure relates to the technical field of chairs, in particular to a zero-gravity and zero-wall chair frame including a base, a seat side plate assembly, a first linkage assembly, an ottoman assembly, a driving mechanism arranged on the base, a second linkage assembly, a backrest assembly and a first driving rod connected with the output end of the driving mechanism. The seat side plate assembly and the second linkage assembly cooperate to drive the backrest assembly to move away from the wall while unfolding, and the backrest assembly will not interfere or conflict with the wall during unfolding or reclining, thus realizing the zero-wall clearance placement of the chair frame in a closed position and saving the placement space of the chair frame.