Foldable Stroller Automatic Backrest Folding Mechanism
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Solution Overview
Problem
Conventional foldable strollers have a complicated structure for connecting the backrest frame to the remaining portion, making the folding process less efficient.
Innovation Solution
A foldable stroller design featuring pivotally connected components, including front and rear legs, seat-supporting tubes, a basket frame, pivoting members, and connecting rods, which allow the backrest frame to fold automatically by rotating about specific pivot points, simplifying the folding mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a conventional foldable stroller uses a complicated structure to connect the backrest frame to the remaining portion, then the backrest frame can be folded automatically, but the device complexity increases
Solution Approach 1:
The patent combines the backrest frame connection mechanism with the existing seat-supporting tubes and basket frame structure. The pivoting members are integrated into the basket frame, and the connecting rods serve dual purposes by connecting both the seat-supporting tubes and the backrest frame, thereby achieving automatic folding without adding separate complex mechanisms.
Solution Approach 2:
The connecting rods serve multiple functions: they connect the seat-supporting tubes to the basket frame, provide structural support, and enable the automatic folding action by transmitting motion from the seat-supporting tubes to the backrest frame through the pivoting members. This multi-functionality reduces the need for additional dedicated folding mechanisms.
2Device complexity
If the backrest frame is connected by a simple structure, then the device complexity is reduced, but the automatic folding capability may be compromised
Solution Approach 1:
The patent employs dynamic pivot connections at multiple points (first pivot point between seat-supporting tube and basket frame, second pivot point between pivoting members and basket frame, third pivot point between connecting rods and pivoting members). These dynamic connections allow the structure to automatically transition between folded and unfolded states through controlled rotational movements, maintaining automatic folding capability with a simple structure.
3Productivity
If multiple pivot points and connecting components are used, then the folding mechanism becomes more efficient, but the manufacturing complexity increases
Solution Approach 1:
The backrest frame is divided into segments connected by pivoting members, allowing independent rotation and folding of each segment. The connecting rods are segmented to connect different components at specific pivot points. This segmentation enables efficient folding through controlled rotation of individual segments while using standard pivot connection techniques that are relatively easy to manufacture.
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 design enables a simple and efficient folding process, reducing the stroller's volume and maintaining stability during use, while allowing for easy adjustment of the backrest frame.
Implementation Method 1
Rotation of the basket frame and the seat-supporting tubes relative to each other about the first pivot point results in rotation of the pivoting members relative to the connecting rods about the third pivot point to thereby rotate the backrest-supporting tube and the basket frame toward the rear legs in different directions
Data Source
AI summary
A foldable stroller includes two front legs, two rear legs, a basket frame, two seat-supporting tubes, two pivoting members, two connecting rods, and a backrest-supporting tube. Rotation of the basket frame and the seat-supporting tubes relative to each other about a pivot point results in rotation of the pivoting members relative to the connecting rods about another pivot point to thereby rotate the backrest-supporting tube and the basket frame toward the rear legs in different directions.