Swingable Chair Chassis with Arcuate Support for Stable Rocking Motion
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Solution Overview
Problem
Conventional chair chassis designs fail to provide reliable support and stable swinging motion due to issues with coupling mechanisms and uneven distribution of forces, leading to discomfort and instability.
Innovation Solution
A swingable chair chassis with a rocker seat, a lid, a supporting seat, and elastic elements, where the rocker seat is mounted between a base and a seat, featuring a slot to restrict lateral movement and conical positioning members for secure engagement, providing arcuate support and adjustable force distribution through elastic elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the seat is supported only by front and rear springs, then the structure is simple, but the support stability is insufficient and the seat is apt to disengage
Solution Approach 1:
The single spring support system is segmented into multiple elastic elements (front elastic element, rear elastic element, and side elastic elements). This segmentation distributes the support function across multiple independent components, enhancing reliability while maintaining structural simplicity through modular design.
Solution Approach 2:
Different regions of the support system are assigned different functions: front and rear elastic elements handle longitudinal swinging, while side elastic elements handle lateral stability. This local differentiation of quality ensures comprehensive support stability without overly complicating the overall structure.
2Device complexity
If the swing plate swings about a fixed pivotal axis, then the connection is simple, but the arm of force compressing the springs cannot be changed in response to swinging height
Solution Approach 1:
The fixed pivotal axis is replaced with a dynamic arcuate supporting face that allows the contact point to move along a curved path. This dynamic adaptation enables the arm of force to change in response to swinging height, improving versatility while maintaining connection simplicity through the arcuate geometry.
Solution Approach 2:
The geometric parameters of the force transmission path are changed by using an arcuate supporting face instead of a fixed axis. This allows the arm of force to vary as a function of swinging angle, enabling adaptive force distribution without complex adjustable mechanisms.
3Ease of manufacture
If conventional coupling mechanisms are used between seat and rocker plate, then assembly is simple, but the coupling is not reliable and components are apt to disengage
Solution Approach 1:
The coupling mechanism uses a nested structure where the lid is mounted on top of the rocker seat, and the supporting seat is disposed within the chamber of the rocker seat. This nesting provides reliable coupling while maintaining assembly simplicity through hierarchical integration.
Solution Approach 2:
The arcuate supporting face and corresponding curved lid interface provide reliable coupling through conformal contact. The curved geometry ensures continuous surface contact during swinging motion, preventing disengagement while maintaining ease of manufacture through simple curved surfaces.
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
Enhances sitting stability and comfort by allowing smooth forward and rearward swinging with proportional returning forces, preventing noise and ensuring stable operation across varying angles.
Implementation Method 1
The plurality of elastic elements is disposed between the bottom wall of the rocker seat and the supporting seat. The plurality of elastic elements is configured to provide movement elasticity when the rocker seat swings forward or rearward relative to the supporting seat.
Data Source
AI summary
A swingable chair chassis comprises a rocker seat including a chamber defined between a bottom wall and a peripheral wall. The bottom wall includes a slot extending in a front/rear direction. A lid is securely mounted to a bottom of the seat and the rocker seat. A supporting seat is disposed in the chamber of the rocker seat. The supporting seat includes a central portion having an insertion hole coupled with chair post. The supporting seat includes an arcuate supporting face formed on an upper side thereof and abutting against a lower face of the lid. A plurality of elastic elements is disposed between the bottom wall of the rocker seat and the supporting seat and provides movement elasticity when the rocker seat swings forward or rearward relative to the supporting seat. The supporting face abuts against the lower face of the lid during swinging movement of the rocker seat.