Folding Trolley With Nested Frames for Compact Storage
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Solution Overview
Problem
Existing folding trolleys have low load bearing capacity, occupy significant storage space when folded, and lack essential features like a sunshade shed, making them inconvenient for outdoor use.
Innovation Solution
A folding trolley design featuring a bottom frame and side frame assembly with X-shaped frames, telescopic wheels, and a liftable canopy, allowing for increased load bearing capacity, compact storage, and additional functionality such as a sunshade.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If translationally foldable trolley structure is used, then structure is simple, but trolley is longer after folding and occupies more storage space
Solution Approach 1:
The patent implements a folding mechanism where the side frames and crossbars nest within each other during folding, with the second side frame containing the first side frame, and crossbars being received within the side frames. This nested arrangement significantly reduces the overall length and storage volume of the trolley when folded, while maintaining structural simplicity through the use of standard hinge connections.
2Device complexity
If translationally foldable trolley structure is used, then structure is simple, but load bearing capacity is limited
Solution Approach 1:
The patent employs an asymmetric X-shaped frame configuration where the side frames and crossbars are positioned at specific angles and locations to optimize load distribution. The first and second side frames are arranged asymmetrically relative to the central axis, with crossbars connecting them at strategic points, creating a structurally efficient design that enhances load bearing capacity while keeping the overall structure relatively simple.
3Device complexity
If basic folding trolley structure is used, then structure is simple, but functionality is poor with no sunshade shed
Solution Approach 1:
The patent integrates multiple functions into the trolley design: the side frames serve both as structural support elements and as mounting structures for the sunshade shed; the folding mechanism provides both compact storage capability and a mounting surface for additional functionality. The crossbars and hinged connections are designed to accommodate both the folding action and the attachment of the sunshade, creating a multi-functional system that enhances versatility without proportionally increasing complexity.
Data Source
AI summary
The present invention provides a folding trolley, which includes a bottom frame folding and unfolding assembly, a front wheel assembly and a rear wheel assembly. Side frame folding and unfolding assemblies are provided on both sides of the bottom frame folding and unfolding assembly, the bottom frame folding and unfolding assembly can be unfolded or folded through the side frame folding and unfolding assembly; one end of the side frame folding and unfolding assembly is connected with the front wheel assembly, the middle part of the side frame folding and unfolding assembly is connected with the bottom frame folding and unfolding assembly, and the other end of the side frame folding and unfolding assembly is connected with the rear wheel assembly. The invention provides a folding trolley, which overcomes the defects of an existing trolley with low load bearing capacity and poor functionality.