Double-Decker Wagon With Separate Decks for Compact Folding
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Solution Overview
Problem
Existing collapsible wagons have small capacity, large folded volume, and are inconvenient for users to pick up items stacked together.
Innovation Solution
A double-decker wagon design with four spaced rectangular standing posts, side folding mechanisms, upper and lower bottom support mechanisms, and a sliding sleeve to maintain horizontal height during folding, allowing for classified item placement and reduced folded volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a single-decker wagon is used, then the structure is simple, but the capacity is small and items cannot be classified
Solution Approach 1:
The wagon body is divided into two separate decks (upper deck and lower deck) that can be independently folded and collapsed. Each deck has its own support mechanism and folding structure, allowing the wagon to maintain separation of items while enabling compact storage when folded.
Solution Approach 2:
The invention transitions from a single-level horizontal structure to a two-level vertical structure by adding an upper deck above the lower deck. This vertical stacking increases capacity without significantly increasing the horizontal footprint when folded.
2Quantity of substance
If a single-decker wagon is used, then the folded volume is large, but the capacity is limited
Solution Approach 1:
The upper deck is positioned above and nested within the vertical space created by the lower deck's support structure. When folded, the upper deck collapses inward toward the lower deck, allowing the two decks to occupy overlapping vertical space and significantly reducing the overall folded volume.
Solution Approach 2:
The wagon utilizes vertical space by stacking decks vertically rather than expanding horizontally. The folding mechanism allows the structure to collapse vertically, reducing the folded volume while maintaining adequate capacity when deployed.
3Ease of operation
If items are stacked on a single-decker wagon, then the capacity is sufficient, but users cannot easily pick up classified items
Solution Approach 1:
Items are separated into different decks (upper deck and lower deck) which allows users to access and pick up items from specific levels without moving other items. This segmentation enables classified item placement and easy selective retrieval.
Solution Approach 2:
The folding mechanism acts as an intermediary that allows the structure to transition between deployed and folded states. When deployed, it provides stable support for items on both decks, enabling easy access while maintaining capacity.
4Volume of stationary object
If the wagon is folded to reduce volume, then the folded volume is reduced, but the horizontal height increases
Solution Approach 1:
The upper deck folds inward toward the lower deck, allowing the two decks to nest within each other's vertical envelope. This nesting action reduces the overall horizontal height while maintaining compact folded volume.
Solution Approach 2:
The folding mechanism transforms the three-dimensional structure into a more compact form by collapsing the vertical separation between decks. The upper deck rotates and folds inward, reducing the horizontal footprint and height while maintaining adequate folded volume reduction.
Data Source
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AI summary
The invention disclosure relates to a double-decker wagon. The double-decker wagon includes four spaced rectangular standing posts (1), four side folding mechanisms (2), an upper bottom support mechanism (4), and a lower bottom support mechanism (5), where the side folding mechanisms (2) are each hinged between two adjacent standing posts (1), where the standing posts (1) each are provided with a first fixing member (101), a second fixing member (102), and a third fixing member (103) in sequence from top to bottom; a sliding sleeve (6) is provided in a sliding manner between the first fixing member (10) and the second fixing member (102); the side folding mechanism (2) is hinged to the sliding sleeve (6) and the first fixing member (101) on the standing post (1); the upper bottom support mechanism (4) is hinged to the second fixing members (102) on the four standing posts (1); and the lower bottom support mechanism (5) is hinged to the third fixing members (103) on the four standing posts (1). The double-decker wagon includes an upper decker and a lower decker, expanding the capacity of the wagon. The upper decker and the lower decker can be provided with cloth bags for placing different types of items separately, achieving classified placement of items and greatly facilitating the user to pick and place the items. The sliding sleeve (6) compensates for the increase in the height of the side folding mechanism (2) by sliding downwards, keeping the top horizontal height of the side folding mechanism (2) unchanged after folding, thereby reducing the folded volume.