Armrest device for adjusting inclination angle of backrest
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Solution Overview
Problem
Conventional methods for adjusting the inclination of a backrest in office chairs are inconvenient as they require users to manually pull the armrests backward while pressing a button, making the process cumbersome and inefficient.
Innovation Solution
An armrest device with a side connecting bracket, positioning seat, and springs that allow for quick adjustment of the backrest inclination through a positioning mechanism, where springs control the movement and limit the armrest's position, enabling easy and safe adjustment of the backrest angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional adjusting methods using an adjusting button are used, then the backrest can be adjusted from a fixed state to a movable state, but the operation becomes cumbersome requiring users to manually pull the armrest backward while pressing the button
Solution Approach 1:
The patent extracts the adjusting button mechanism from the traditional design and replaces it with a spring-based automatic returning mechanism. The first spring (5) and second spring (6) are extracted to provide automatic return functionality, eliminating the need for buttons and manual operations. This allows the armrest to be pulled backward and automatically return to its original position through spring force, significantly simplifying the user operation.
Solution Approach 2:
The positioning mechanism achieves self-service through the spring system. When the user pulls the armrest backward for adjustment, the first spring (5) and second spring (6) are compressed. Upon release, the springs automatically propel the armrest back to its initial position without requiring any additional user action or button pressing. The system serves itself by converting the user's pulling action into stored elastic energy that automatically restores the original state.
2Adaptability or versatility
If the backrest is allowed to incline freely without limitation, then the adjustment range is increased, but the backrest may tilt excessively causing user fright or discomfort
Solution Approach 1:
The patent applies preliminary anti-action by using the first spring (5) and second spring (6) to pre-establish a restoring force that counteracts excessive tilting. Before the backrest can tilt to an dangerous extent, the compressed springs generate elastic force that pushes back, preventing the armrest and backrest from reaching positions that would cause user fright or discomfort. This preliminary counter-action ensures safe operation limits are maintained.
Solution Approach 2:
The spring mechanism provides beforehand cushioning by absorbing the energy of the pulling action and gradually releasing it during the return motion. The first spring (5) and second spring (6) act as cushioning elements that control the speed and force of the backrest's return, preventing sudden or jerky movements that could startle the user. The springs cushion the transition, ensuring a smooth and safe adjustment process.
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 device allows for quick and convenient adjustment of the backrest inclination, preventing excessive tilting and ensuring safe return to the original position, with a simple and stable overall structure.
Implementation Method 1
a first spring limiting a movement of the armrest in an X direction... The first spring in the X direction is configured to connect and limit the fixing seat and the backrest, as well as pull the armrest
Implementation Method 2
a second spring limiting a movement of the armrest in a Z direction... The second spring in the Z direction is configured to connect and limit the fixing seat and the armrest, so that a lifting height of the armrest is limited
Data Source
AI summary
An armrest device for adjusting an inclination angle of a backrest. The armrest device includes a side connecting bracket and an armrest. A lower end of the side connecting bracket is fixedly connected with a seat cushion. Right ends of the side connecting bracket and the armrest are rotatably connected with the backrest. An upper end of the side connecting bracket is fixedly connected with a positioning seat. An upper end of the positioning seat extends to an inner cavity of the armrest. The positioning seat shifts the inclination angle of the backrest and limits a position of the backrest through a positioning mechanism. A first spring limiting a movement of the armrest in an X direction and a second spring limiting a movement of the armrest in a Z direction are disposed between the positioning seat and the armrest.