Portable Folding Cart Lateral Scissor Mechanism
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Solution Overview
Problem
Existing portable folding carts require users to lie down or bend down to fold and unfold the scissors-bar assemblies, making the process inconvenient and unstable.
Innovation Solution
The portable folding cart design includes folding rods located at both sides of the scissors-bar assemblies, corner bars with casters and sockets, a tow rod with adjustable length, and pulling devices with guide pockets and straps, allowing for easy and stable folding without bending, and enabling quick folding and unfolding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the scissors-bar assemblies are folded and unfolded by vertical movements at the center of the bottom surface, then the folding mechanism is simple, but the user must lie down or bend down making the operation inconvenient
Solution Approach 1:
The patent changes the folding mechanism from vertical movement at the center to lateral movement at both sides of the cart. By positioning folding rods at lateral sides connected to scissors-bar assemblies, the user can fold the cart by pulling handles at waist height, transforming the operation from an inconvenient vertical center-based mechanism to a convenient lateral side-based mechanism.
2Ease of operation
If the folding rods are positioned at lateral sides connected to scissors-bar assemblies, then the folding operation is convenient without bending, but the structure becomes more complex
Solution Approach 1:
The patent divides the folding function into separate components: folding rods positioned at lateral sides, scissors-bar assemblies, folding brackets, and pulling devices. Each component has a specific function, and their coordinated operation achieves convenient folding. The folding rods are rotatably connected to lower sockets and connected to folding brackets, creating a segmented but integrated system that improves ease of operation.
Solution Approach 2:
The folding brackets act as intermediaries between the folding rods and the scissors-bar assemblies. When users pull the handles of the folding rods, the folding brackets transmit and amplify this force to fold the scissors-bar assemblies. This intermediary mechanism allows users to fold the cart with minimal effort at convenient hand heights.
3Reliability
If the center connection sockets are used for folding, then the structure is simple, but the user must stretch arms and bend down making the folding unstable
Solution Approach 1:
The patent moves the folding operation from the vertical center dimension to the lateral side dimension. By positioning folding rods at lateral sides with handles at waist height, the user can apply force horizontally rather than vertically, improving both stability and ease of operation simultaneously.
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
This design allows users to conveniently and stably fold and unfold the cart without bending, enhances durability, and provides adjustable towing compatibility, simplifying the folding process and improving user convenience.
Implementation Method 1
one ends rotatably connected to the lower sockets located at front and rear sides in a progressive direction of the portable folding cart
Implementation Method 2
ends of the pair of scissors-bars, which face each other, are rotatably fixed to the folding brackets
Implementation Method 3
opposite ends of the pair of scissors-bars are slidably connected to the folding rods
Implementation Method 4
a handle provided at a top of the tow rod to allow the tow rod to be telescopically coupled with the connection bracket
Data Source
AI summary
Provided is a portable folding cart including two folding rods, a base structure, a tow rod, and pulling devices that are located at both insides of scissors-bar assemblies and provided folded and unfolded together with scissors-bar assemblies so as to allow a user to conveniently and stably perform a folding process with the scissors-bar assemblies without lying or bending a body down. Therefore, the portable folding cart is conveniently and stably folded so that durability and reliability are increased.