Chair Back Depth Adjustment Using Pneumatic Rod and Hinge Mechanism
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Solution Overview
Problem
Conventional chairs with tilting force adjustment devices only allow adjustment of the tilting angle of the backrest, lacking the ability to adjust the back depth.
Innovation Solution
A chair design incorporating a chassis with an adjustable back depth, featuring a hinge seat, pneumatic rod, trigger piece, and drive piece, allowing for the adjustment of the back depth through a simple and fast mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional tilting force adjustment device is used, then the tilting angle of the backrest can be adjusted, but the back depth cannot be adjusted
Solution Approach 1:
The drive piece is designed to perform multiple functions: it can adjust both the tilting angle of the backrest and the depth of the backrest by rotating. This single component replaces what would traditionally require separate adjustment mechanisms, thereby enhancing adaptability while controlling device complexity
Solution Approach 2:
The backrest is designed with dynamic adjustment capabilities, allowing it to change not only its tilting angle but also its depth position. The connection between the drive piece and the backrest enabling mechanism allows for dynamic repositioning in multiple degrees of freedom, making the system more adaptable to different user needs
2Productivity
If a simple adjustment mechanism is used, then the structure remains simple, but the adjustment speed and efficiency are reduced
Solution Approach 1:
A pneumatic rod is integrated into the adjustment mechanism to provide rapid movement of the backrest. The pneumatic actuation enables fast adjustment of both tilting angle and back depth, significantly improving adjustment speed and efficiency while maintaining relatively simple mechanical structure
3Adaptability or versatility
If multiple adjustment functions are integrated, then the versatility is improved, but the ease of operation may be compromised
Solution Approach 1:
The adjustment mechanisms for tilting angle and back depth are merged into a single integrated system controlled by one drive piece. By combining multiple adjustment functions into one unified mechanism, the system maintains versatility while improving ease of operation, as the user controls both adjustments through a single component
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
Enables easy and efficient adjustment of the back depth, providing a more customizable seating experience with a simple structure and convenient assembly.
Implementation Method 1
a pneumatic rod, hinged to the bottom of the support seat frame and extending into the hinge seat
Data Source
AI summary
A chair with an adjustable back depth includes a chassis, a seat plate, a back plate, a hinge seat, a pneumatic rod, a trigger piece, a drive piece, a support seat frame, rocking bars. The hinge seat includes a hinge cavity and a rod channel. The hinge seat is arranged in the accommodating cavity. An inner side of a lower end is hinged to a rear hinge hole of the support plate. A lower hinge plate of the rocking bar is hinged to a front hinge hole of the support plate. A main body of the pneumatic rod is hinged to the bottom hinge cavity. The trigger piece is hinged to the hinge seat and cooperates The drive piece is arranged on the chassis An adjustment device consists of the hinge seat, which has a simple structure, convenience in assembly, realize the adjustment of the depth of the back.