Double-Deck Wagon Folding Structure for Compact Storage Stability

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Solution Overview

Problem

Existing double-deck wagons face issues with excessive storage space after folding due to the top rising, compromising load-bearing capacity and structural stability, particularly when slidable sleeves are introduced to prevent this rise.

Innovation Solution

A separable liftable double-deck wagon design featuring multiple folding rod assemblies with slidable and fixed connecting members, pivotally connected rods, and unidirectional limiting members to ensure the top does not rise during folding, maintaining compact storage while ensuring load-bearing strength and stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If slidable sleeves are introduced at junctions of scissor rods to prevent top rising during folding, then storage height is reduced, but load-bearing capacity and structural stability of the upper loading platform are significantly reduced

Engineering Contradiction:

Improvestorage heightVSAvoidload-bearing capacity

Core Design Contradiction:

Volume of moving objectVSStrength

Solution Approach 1:

The connecting member is divided into a fixed connecting member portion and a slidable connecting member portion. The fixed portion maintains rigid connection for structural stability, while the slidable portion allows controlled movement to prevent top rising during folding. This segmentation resolves the contradiction by separating the functions of rigidity and flexibility into different parts of the same component.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The slidable connecting member portion is nested within the rod structure, allowing it to move along the rod axis while remaining integrated with the overall connecting member. This nesting approach enables the connecting member to adapt its effective length during folding without compromising the rigid connection provided by the fixed portion, thus reducing storage height while maintaining load-bearing capacity.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Volume of moving object

If scissor rods are folded to reduce storage space, then storage volume is reduced, but the top of the wagon rises synchronously increasing storage height

Engineering Contradiction:

Improvestorage volumeVSAvoidstorage height

Core Design Contradiction:

Volume of moving objectVSLength of stationary object

Solution Approach 1:

The connecting member incorporates a slidable portion that dynamically adjusts its position along the rod axis during folding operations. This dynamic adjustment allows the top of the wagon to move synchronously with the folding action, preventing unwanted rising and maintaining compact storage height while achieving volume reduction through folding.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The slidable connecting member portion acts as an intermediary between the fixed connecting member and the scissor rod junction. It mediates the folding motion by allowing controlled sliding that coordinates the top movement with the rod folding, thereby preventing top rising while enabling compact storage.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Length of stationary object

If slidable sleeves are added to control top position during folding, then storage height is controlled, but the upper loading platform becomes susceptible to shaking and deformation under load

Engineering Contradiction:

Improvestorage heightVSAvoidstructural stability

Core Design Contradiction:

Length of stationary objectVSStability of the object's composition

Solution Approach 1:

The connecting member is segmented into fixed and slidable portions, where the fixed portion provides rigid structural support to prevent shaking and deformation, while the slidable portion controls top position during folding. This segmentation allows the same component to simultaneously provide both stability and height control.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The fixed connecting member and slidable connecting member are merged into a single integrated connecting member. This merging ensures that the rigid connection for stability and the slidable mechanism for height control work together as a unified system, preventing shaking and deformation while maintaining controlled storage height.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS12552431B1Separable liftable double-deck wagon

Publication Date: 2026.02.17 WUYI SHANQIU LEISURE PRODUCTS CO LTD

AI summary

A separable liftable double-deck wagon includes two front main rods and two rear main rods, top fixing members are fixed to tops of the front and rear main rods, and bottom fixing members are fixed to bottoms of the front and rear main rods. The front and rear main rods are sequentially provided with fixed connecting members and slidable connecting members from top to bottom. A front-rear folding rod assembly is arranged between the front and rear main rods, rod ends of the front-rear folding rod assembly are pivotally connected to the top fixing members and the slidable connecting members, respectively. One respective side folding rod assembly is arranged between the front main rods and between the two rear main rods. Upper and lower folding rod assemblies are arranged from top to bottom in a rectangular space defined by the four main rods.