Folding Wagon Scissor Mechanism Torque Absorption
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Solution Overview
Problem
Existing portable folding wagons face issues with flexible pipes that are prone to torque during folding and unfolding, leading to a shortened service life, excessive material usage, and potential hand entrapment during unfolding, compromising safety and efficiency.
Innovation Solution
The design incorporates a support rod connected to a sliding piece that absorbs torque, reduces material usage, and enhances assembly security by using a through hole in the bottom connecting base and a pull rod mechanism, allowing for easier folding and unfolding while minimizing material costs and preventing hand entrapment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If flexible pipes are used to connect wheels to the scissor mechanism, then the structure allows folding and unfolding motion, but the flexible pipes are subjected to torque during operation resulting in shortened service life
Solution Approach 1:
The patent changes the connection mechanism from flexible pipe to support rod with sliding piece, altering the physical parameters of the connection to eliminate torque while maintaining folding capability
Solution Approach 2:
The patent extracts the flexible pipe from the system and replaces it with a support rod structure that separates the folding function from the wheel support function, eliminating the torque problem
2Adaptability or versatility
If two pipes are used to form the flexible pipe, then flexibility and folding capability are achieved, but much material is used increasing cost
Solution Approach 1:
The patent extracts the unnecessary second pipe from the flexible pipe structure and replaces the entire flexible pipe with a single support rod, reducing material usage while maintaining functionality
Solution Approach 2:
The patent segments the functions of the flexible pipe into separate components: support rod for structural support and sliding piece for folding motion, achieving the same effect with less material
3Ease of operation
If flexible pipes are used in the folding mechanism, then folding and unfolding is possible, but the flexible pipe might stack one's hand during unfolding compromising safety
Solution Approach 1:
The patent converts the potential harm of hand entrapment into a safety feature by designing a through hole in the bottom connecting base that prevents finger insertion while allowing the necessary folding motion
Solution Approach 2:
The patent introduces a sliding piece as an intermediary between the support rod and scissor unit, mediating the folding motion to eliminate the pinching hazard while maintaining operational ease
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 extends the service life of the folding frame, reduces material costs, enhances user safety, and simplifies the assembly process by absorbing torque and preventing hand entrapment, resulting in a more robust and compact structure.
Implementation Method 1
the sliding connecting piece is slidably connected to the scissor unit of the scissor mechanism
Implementation Method 2
the top portions of two adjacent scissor mechanisms are rotatably connected by a top connecting base, the bottom portions are rotatably connected by a bottom connecting base
Data Source
AI summary
A portable folding wagon includes a wagon frame with a folding frame and wheels. The folding frame has four scissor mechanisms, each mechanism has at least a scissor unit. The top portions of two adjacent scissor mechanisms are rotatably connected by a top connecting base, the bottom portions are rotatably connected by a bottom connecting base; the bottom connecting base is rotatably connected to a support rod, the bottom connecting base is disposed with a through hole, the top periphery of the through hole of the bottom connecting base extends upwardly to form a surrounding wall for the support rod to pass through, the bottom end of the support rod passes through the surrounding wall and the through hole and connects to the wheel, the top end of the support rod is rotatably connected to a sliding connecting piece, the sliding connecting piece is slidably connected to the scissor unit.