Foldable Chair Linkage Design for Forward-Position Folding Operation
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Solution Overview
Problem
The existing foldable chair design requires users to move rearward to transition between stretched and folded states, making it inconvenient for users to operate.
Innovation Solution
The foldable chair incorporates a scissor linkage unit, linking rod units, and a modified configuration of foldable rod units that allow users to fold or unfold the chair by moving the armrest units and front leg rods from a forward position, eliminating the need to move rearward.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pull rod unit is positioned behind the foldable chair, then the foldable rod units can be effectively controlled to transition between stretched and folded states, but users must move rearward to operate it, reducing ease of operation
Solution Approach 1:
The patent repositions the pull rod unit from a rearward location to a forward location, changing its spatial dimension relative to the user. This allows users to operate the folding mechanism from the front of the chair rather than moving to the back, resolving the contradiction between reliable control and ease of operation.
Solution Approach 2:
The patent introduces linking rod units as intermediary components that connect the pull rod unit to the foldable rod units. These linking rods transmit the folding force from the forward-positioned pull rod unit to the foldable rod units, enabling reliable control while maintaining convenient forward access for the user.
2Reliability
If the pull rod unit is positioned at the rear of the chair, then the existing folding mechanism can function, but the operation becomes inconvenient requiring user displacement
Solution Approach 1:
By relocating the pull rod unit to the front of the chair structure, the patent eliminates the need for users to move to the rear of the chair. This spatial repositioning reduces the time and effort users must spend moving to access the control mechanism, while the linking rod units ensure the folding function remains effective.
3Stability of the object's composition
If the foldable rod units are positioned to provide structural stability, then the chair can be reliably supported, but the control mechanism becomes inaccessible from the front
Solution Approach 1:
The linking rod units serve as intermediary elements that decouple the control mechanism's position from the foldable rod units' position. This allows the pull rod unit to be positioned at the front for ease of access while still effectively controlling the foldable rod units that provide structural stability, resolving the contradiction between stability and accessibility.
Data Source
AI summary
A foldable chair includes backrest rods hinged to a seat unit, leg units, armrest units, a first foldable rod unit, and a linking rod unit. Each leg unit includes a sleeve member connected to the seat unit and slidably sleeved on a rear leg rod connected to the seat unit. Each armrest unit is connected to one of the leg units and one of the backrest rods. The first foldable rod unit is connected between the backrest rods to move the backrest rods. The linking rod unit includes an end connected to the first foldable rod unit, and another end pivotally connected to one of the backrest arm units, or one of the sleeve members of the leg units.