armchair
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Solution Overview
Problem
Conventional chairs, especially those made of wood or with limited material flexibility, cannot incorporate a backrest that swings or reclines effectively for enhanced user comfort, and existing solutions with small amplitude elastic materials do not meet diverse user needs.
Innovation Solution
A novel armchair design featuring an elastic assembly with a backrest pivotally connected to a base via a rotating shaft, an armrest connected to the base, and an elastic assembly providing elastic force when the backrest swings, utilizing components like connecting rods, springs, and limiting members to control the swing amplitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a backrest is made rigid in wooden chairs, then structural strength is maintained, but the backrest cannot swing or recline to provide comfort
Solution Approach 1:
The chair is divided into separate functional modules: a rigid base structure for strength, and a separate backrest assembly with swing capability connected via a rotating shaft. This segmentation allows each part to fulfill its specific function without compromising the other.
Solution Approach 2:
The backrest is designed with dynamic movement capability through the rotating shaft connection, allowing it to swing between a upright position and a reclined position. This dynamic feature enables the backrest to adapt to user comfort needs while the rigid base maintains structural strength.
2Ease of operation
If metal and plastic chairs use elastic materials for backrest swing, then some movement is achieved, but the swing amplitude is extremely small and cannot achieve optimal comfort
Solution Approach 1:
The rotating shaft mechanism enables large-amplitude backrest swing by providing a dedicated rotational joint between the backrest and base. This dynamic connection allows the backrest to achieve significant recline angles without relying on limited elastic deformation of materials.
Solution Approach 2:
The spring constant of the elastic assembly is carefully selected to provide sufficient elastic force for the desired swing amplitude. By adjusting the elastic parameter (spring constant), the system achieves optimal balance between swing range and structural stability.
3Ease of operation
If the backrest is designed to swing freely, then comfort is improved, but the chair structure becomes unstable
Solution Approach 1:
The elastic assembly acts as a counterbalancing mechanism that provides restoring force to the backrest during swinging. This elastic force counteracts the gravitational effect and user applied forces, maintaining structural stability while allowing controlled movement.
Solution Approach 2:
The spring constant is optimized to provide appropriate elastic force that balances backrest adjustability with structural stability. The elastic force increases with displacement, providing gentle support during normal use and stronger restoring force at extreme positions to prevent instability.
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 armchair's elastic assembly allows the backrest to swing or recline within a significant amplitude, providing enhanced comfort by adjusting to user pressure and resetting with elastic force, thus improving overall user experience.
Implementation Method 1
the elastic assembly is configured to provide an elastic force when the backrest swings around the first rotating shaft
Implementation Method 2
When the first limiting member moves toward the open end, the spring is compressed by the protrusion and the first limiting member
Data Source
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AI summary
The present invention provides a novel armchair, including a base, a backrest pivotally connected to the base by a first rotating shaft, and an armrest connected to the base. The novel armchair further includes an elastic assembly fixed on the armrest. The backrest and the elastic assembly are pivotally connected by a second rotating shaft. The elastic assembly is configured to provide elastic force when the backrest swings around the first rotating shaft. The armchair is provided with the elastic assembly between the backrest and the armrest permitting the backrest to be able to swing, or adjustably recline, relative to the base. Moreover, the elastic assembly can provide a certain elastic force when the backrest swings. In use, the elastic assembly controls the swing amplitude of the backrest according to the pressure exerted by the user's back on the backrest. When the user reclines backward, the elastic assembly acts as a cushion to support the backrest to slowly swing, or adjustably recline, backward due to the elastic force. When the user rises, the elastic force of the elastic assembly urges the backrest to reset. In this way, the comfort of this novel armchair is significantly improved.