Chair frame and multifunctional chair
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Solution Overview
Problem
Multifunctional chairs suffer from disorganized state changes, particularly when transitioning from a lying state to a sitting state, where the leg assembly may retract before the backrest assembly resets to an upright position, disrupting the intended state transition.
Innovation Solution
A chair frame design incorporating a frame body assembly, hip assembly, backrest assembly, linkage assembly, leg assembly, retracting and extending assembly, and restoring elastic member, with a retracting and extending actuator, ensures a controlled transition by first resetting the backrest assembly to an upright position before retracting the leg assembly, utilizing a retracting and extending assembly and restoring elastic member to manage the state changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the leg assembly retracts before the backrest assembly resets, then the state transition is faster, but the state change becomes disorganized and fails to meet design requirements
Solution Approach 1:
The backrest assembly is designed to reset to the upright position before the leg assembly retracts. The restoring elastic member accumulates energy during the lying state and automatically drives the backrest assembly to return to upright position first, ensuring the correct sequence of operations is maintained regardless of transition speed
2Reliability
If the backrest assembly resets first before leg assembly retraction, then the state change is organized and meets design requirements, but the transition process becomes more complex
Solution Approach 1:
The restoring elastic member is pre-loaded during the lying state and automatically drives the backrest assembly to reset without requiring external control. This self-service mechanism ensures the correct operation sequence while minimizing the need for complex control systems
Solution Approach 2:
The linkage assembly integrates the backrest assembly and leg assembly into a coordinated mechanism. The restoring elastic member simultaneously controls both assemblies through the linkage, ensuring they work together in the correct sequence without requiring separate control systems
3Reliability
If multiple assemblies coordinate during state transition, then the transition is controlled and orderly, but the energy consumption increases
Solution Approach 1:
The restoring elastic member is periodically loaded during the lying state and then releases energy in a controlled manner to drive the backrest assembly reset. This periodic energy storage and release mechanism provides controlled transitions without requiring continuous energy input from motors or actuators
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 chair frame achieves a proper and orderly transition from a lying state to a sitting state, aligning with human body movements, ensuring the backrest assembly is reset first, followed by the leg assembly retraction, thereby maintaining a consistent and energy-efficient state change process.
Implementation Method 1
the restoring elastic member having a potential energy is capable of driving the backrest assembly to move forward to an upright position
Data Source
AI summary
A chair frame and a multifunctional chair are provided. The chair frame includes a frame body assembly, a hip assembly, a backrest assembly, a linkage assembly, a leg assembly, a retracting and extending assembly, a leg assisting assembly and a restoring elastic member. The frame body assembly includes a retracting and extending actuator; the backrest assembly is connected to the frame body assembly and the hip assembly; a first connecting rod mechanism includes the linkage assembly, the hip assembly and the backrest assembly, and a second connecting rod mechanism includes the linkage assembly, the frame body assembly and the backrest assembly; the leg assembly is disposed on the hip assembly and connected to the retracting and extending actuator; the retracting and extending assembly is disposed on the hip assembly, and the restoring elastic member includes an assembling end and a restoring end.