Cushion device for foldable chair
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Solution Overview
Problem
Foldable chairs with tension springs face issues of spring deformation leading to loss of automatic folding functionality and collision-induced noise and vibration due to poorly designed buffer pads.
Innovation Solution
A seat cushion device with tension springs having angled hooking portions to prevent deformation and a buffer member with an embedded portion that avoids the fixing element, reducing noise and vibration during folding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the L-shaped lower engaging hook of the tension spring is used to engage the hooking hole in the limiting plate, then the automatic folding function is initially achieved, but the engaging hook slides out after a period of use due to loss of elasticity, causing the tension spring to lose its function
Solution Approach 1:
The patent applies curvature by designing the engaging hook with an arc-shaped configuration that conforms to the curvature of the hole in the limiting plate. This curved design allows the hook to better fit and engage with the hole, preventing sliding out due to elastic loss during repeated folding operations.
Solution Approach 2:
The patent employs asymmetry by designing the engaging hook with an L-shape configuration where the vertical and horizontal segments have different orientations and functions. The vertical segment engages with the hole while the horizontal segment provides additional anchoring, creating an asymmetric structure that prevents disengagement more effectively than a symmetric design.
2Object-affected harmful factors
If the embedded portion of the buffer pad is placed inside the side channel of the rear leg, then the buffer pad can absorb impact, but the fixing element blocks the embedded portion from being flush with the exposed surface, causing the sleeve portion to slide down and generate noise
Solution Approach 1:
The patent resolves the spatial conflict by moving the buffer pad assembly to a different dimensional location - specifically, mounting it on the rear leg rather than embedding it in the side channel. This dimensional relocation allows the buffer pad to function without interference from the fixing element while maintaining its impact absorption capability.
Solution Approach 2:
The patent introduces a new component structure that acts as an intermediary between the buffer pad and the chair frame. This intermediary mounting structure on the rear leg provides a stable attachment point that avoids the blocking issue created by the fixing element in the side channel, allowing the buffer pad to remain stationary and functional.
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 solution ensures the tension spring maintains functionality over time and the buffer member effectively absorbs impact, minimizing noise and vibration when the seat folds automatically.
Implementation Method 1
When the seated person stands up, the seat 820 is automatically folded into a folded condition due to restoration force of the tension spring 910
Implementation Method 2
the buffer member effectively absorbs impact, minimizing noise and vibration when the seat folds automatically
Data Source
AI summary
A cushion device for a foldable chair includes a buffer member and a tension spring. The buffer member includes a sleeve portion for sleeving over a side part of a rear leg, a buffer portion provided on the sleeve portion and an embedded portion provided along a side of the sleeve portion and embedded inside a side channel of the rear leg and secured thereat via a fixing element. The tension spring includes a spring body having a first hooking portion fixed a pivot plate of a seat and a second hooking portion including a second extension section, a second bent section engaging a limiting plate of a front leg and a third extension section extending from the second bent section in such a manner to prevent disengagement of the second bent section of the tension spring from a hooking hole in the limiting plate.