Foldable Chair Linkage Design for Synchronized Folding Operation
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Solution Overview
Problem
Conventional foldable chairs are inconvenient to switch between stretched and folded states due to the need to manually move multiple components.
Innovation Solution
A foldable chair design featuring a chair back unit with back rod sets, side leg units with scissor legs, a foldable rod unit, and linking rod units that allow for easy conversion between states by pivoting and sliding mechanisms, enabling smooth transition between stretched and folded configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the conventional foldable chair uses separate backrest unit, side leg units, and front leg unit that are pivotally connected, then the chair can be folded and unfolded, but the user has to move each unit separately which is inconvenient
Solution Approach 1:
The patent combines the backrest unit, side leg units, and front leg unit into a single integrated foldable chair structure where all components are connected through a unified linkage mechanism. The linking rod units connect the back rod sets to the side leg units, creating a synchronized folding system where moving one component automatically moves all other components together, eliminating the need to manually operate each unit separately.
2Ease of operation
If the foldable chair uses back rod sets with upper and lower sleeves that are slidably connected, then the chair can transition smoothly between states, but the structure becomes more complex
Solution Approach 1:
The patent employs a nested sleeve structure where the upper sleeve is slidably received within the lower sleeve, and the back rod is received within the upper sleeve. This nested arrangement allows for compact packaging when folded while maintaining smooth transitional motion. The sliding connection between nested sleeves provides guided movement that ensures smooth state transitions without requiring complex external mechanisms.
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
Facilitates easy and smooth operation between the stretched and folded states, enhancing user convenience by simplifying the folding and unfolding process.
Implementation Method 1
an upper sleeve that is slidably sleeved on the back rod
Implementation Method 2
an upper sleeve that is slidably sleeved on the back rod
Implementation Method 3
first and second scissor legs that are arranged in the left-right direction and that are crossed over and pivotally connected to each other
Implementation Method 4
The foldable rod unit is pivotally connected between the back rods of the back rod sets and is operable to move the back rods of the back rod sets toward or away from each other
Data Source
AI summary
A foldable chair includes a chair back unit, two side leg units, a chair cover unit, a foldable rod unit, and a linking rod unit. The chair back unit includes back rods that extends in a top-bottom direction. The chair cover unit has ends secured to the side leg units, and other ends respectively and slidably sleeved on the back rods. The foldable rod unit is pivotally connected between the back rods and is operable to move the back rods toward or away from each other. The linking rod unit includes an end that is pivotally connected to the foldable rod unit, and another end that is pivotally connected to the chair back unit.