Chair Tilt Control with Removable Unstressed Spring Assembly
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Solution Overview
Problem
Conventional tilt control systems for furniture are complex and difficult to assemble/disassemble, with preloaded springs making replacement challenging, and often require costly linkages and mechanisms for kinematic movement.
Innovation Solution
A tilt control system featuring a base, backrest, compression spring, and spring adjuster with a pivotally coupled stop feature, allowing for easy adjustment and replacement of springs without preloading, and a method for assembling the system that includes a stop feature for limiting backrest rotation, enabling quick release attachment and minimizing parts complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional tilt control systems use preloaded compression springs, then the biasing return force is provided, but the springs become difficult to disassemble and replace
Solution Approach 1:
The spring assembly is divided into separate components: the compression spring, the first stop, and the second stop with stop feature. This segmentation allows the spring to be replaced independently without replacing the entire assembly, facilitating easier repair and maintenance while maintaining the biasing return force function.
2Adaptability or versatility
If linkages and mechanisms are added to achieve kinematic movement, then the motion control is improved, but the device complexity and cost increase
Solution Approach 1:
The patent combines multiple functions into the stop and stop feature components. The stop feature on the second stop not only limits the recline position but also serves as an engagement point for the compression spring. This merging of functions reduces the need for separate linkages and mechanisms, thereby reducing device complexity and cost while maintaining kinematic movement capability.
3Ease of operation
If the stop includes curved transition surfaces, then the transition between stop surfaces is smooth, but the manufacturing complexity increases
Solution Approach 1:
The stop is designed with curved transition surfaces between the first and second stop surfaces. These curved surfaces provide a smooth transition for the stop feature as the second stop rotates, improving ease of operation and user experience. The curvature is designed to be manufacturable using standard machining processes, balancing the need for smooth operation with manufacturing feasibility.
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 system allows for easy adjustment and replacement of springs, simplifies assembly and disassembly, reduces costs, and provides a smooth transition between stop surfaces, enhancing user interaction and reducing complexity in the interface between the backrest and base.
Implementation Method 1
The compression spring is compressible between a first condition when the backrest is in the upright position and a second condition when the backrest is in the reclined position. The second condition includes a greater degree of compression than the first condition.
Data Source
AI summary
A tilt control system includes a spring adjuster and compression spring, which may be removed in an unstressed condition. The tilt control system may also include a variable back stop having curved transition surfaces between the stop surfaces. A lumbar compensator may be integrated into a backrest, which may be coupled with a quick release to the base and actuated by sliding engagement with the seat.