Foldable Trolley Rear Handhold U Frame Design
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Solution Overview
Problem
Existing foldable trolleys either have a small goods-storage space or an aesthetically unattractive design, as they typically feature a handhold frame at the front, which limits their convenience for storage and transportation.
Innovation Solution
A foldable trolley design with a handhold U frame at the back, a flexible fabric bag supported by upper and front U frames, and a 4-bar connecting mechanism for smoother unfolding and folding, allowing the trolley to be folded into a flat structure for storage and featuring a handle to maintain structural integrity during use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the handhold frame is positioned at the front of the trolley, then the structure is simpler and easier to manufacture, but the aesthetic appearance deteriorates and the bag suspension becomes unattractive
Solution Approach 1:
The patent applies inversion by repositioning the handhold frame from the conventional front position to the rear position of the trolley. This reverses the traditional design arrangement, allowing the bag to be supported by the upper and front U-frames rather than hanging from the handhold frame, thereby achieving both aesthetic appeal and structural functionality
2Ease of operation
If the trolley is designed to be foldable for storage, then the storage convenience is improved, but the structural rigidity deteriorates during use
Solution Approach 1:
The patent segments the trolley frame into multiple U-frames (upper, front, handhold, support) connected by hinged joints, allowing each segment to move independently during folding while maintaining structural integrity during use. The connecting bars and hinged connections enable the segmented structure to fold flat for storage yet remain rigid when assembled
Solution Approach 2:
The patent employs dynamic hinged connections that allow the frame to transition between folded and unfolded states. The movable hinges and connecting bars enable smooth folding motion while maintaining structural stability during operation, with the frame adapting its configuration based on operational requirements
3Quantity of substance
If a rigid storing basket is used, then the goods storage space is maximized, but the foldability and storage convenience deteriorate
Solution Approach 1:
The patent replaces the rigid storing basket with a flexible fabric bag that can be supported by the upper and front U-frames. This flexible structure provides adequate goods storage space while allowing the entire trolley assembly to fold flat for convenient storage, eliminating the conflict between storage capacity and foldability
4Device complexity
If the bag is suspended on the front handhold frame, then the structure is simpler, but the aesthetic appearance and user comfort deteriorate
Solution Approach 1:
The patent inverts the conventional bag suspension arrangement by having the bag supported by the upper and front U-frames rather than hanging from the handhold frame. This reversal improves aesthetic appearance and user comfort while the bag remains securely attached through the lower edges fixed to the lower frame and upper edges fixed to the supporting frames
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 provides a convenient, aesthetically pleasing, and space-efficient solution for shopping and temporary goods transportation, with improved rigidity and ease of operation, allowing direct force transmission and stable support for the folded trolley.
Implementation Method 1
The middle part is hinged to both sides of the upper U frame back part. The front U frame and support U frame are hinged to each other at the middle part. Both sides of the front U frame are respectively hinged to both sides of the lower frame middle part
Implementation Method 2
Both sides of the upper U frame middle part are respectively hinged to both sides of the lower frame middle part by a connecting bar. This connecting bar forms a 4-bar connecting mechanism with parts of lower frame, upper U frame and handhold U frame
Implementation Method 3
The front rollers are installed at the transversal bar supporting the U frame. The back rollers are installed at the back of the lower frame
Data Source
AI summary
The present invention relates to a foldable trolley having a trolley frame and a flexible fabric bag or the like. The invention is characterized by its unique design that includes a light weight structure, a large supported space and can be conveniently folded and unfolded. The trolley can alternatively be folded into a flat structure to save storage space or put into a car trunk for shopping or for the temporary transporting of goods. In this structure, both sides of the handhold U frame are directly hinged to the lower frame. The motive force can be directly transmitted to the lower frame. The overall shape appeals to the public aesthetic sense; and moreover, the hinge point between the handhold U frame and lower frame is the center for unfolding and folding, and thus has a smoother operation.