Multi-Tier Utility Cart Shelves With Recessed Gait Clearance
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Solution Overview
Problem
Conventional utility carts with extended shelves obstruct the user's gait and inefficiently use materials, as the increased surface area requires more plastic and can lead to collisions with the cart edges while being pushed.
Innovation Solution
An ergonomic multi-tier utility cart design featuring a recess on the trailing edge of lower shelves and an integrated handle on the top shelf, allowing for improved leg clearance and structural rigidity, while utilizing a single mold for both shelf types to optimize material usage and provide additional storage through a utility tray.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the surface area of cart shelves is extended to the edges of cart posts and beyond to maximize capacity, then the storage capacity is improved, but the user's gait is adversely affected and material usage increases
Solution Approach 1:
The shelf is segmented into two distinct zones: a full surface area region for maximum storage capacity and a recessed region at the trailing edge for ergonomic clearance. This segmentation allows the shelf to simultaneously provide extensive storage while creating leg clearance space, resolving the contradiction between capacity and ease of operation
Solution Approach 2:
The shelf transitions from uniform quality to non-uniform quality by introducing a recessed portion at the trailing edge. This local modification maintains full surface area in storage-critical regions while reducing material presence in the leg clearance region, thereby improving ergonomics without sacrificing overall storage capacity
2Quantity of substance
If the surface area of shelves is extended beyond cart posts to maximize capacity, then the storage capacity is improved, but more plastic material is required for molding
Solution Approach 1:
The shelf design segments the surface area into full-coverage zones for storage and a recessed zone at the trailing edge. This segmentation reduces the total volume of plastic material required while preserving the essential storage capacity in the critical areas, thereby reducing material loss without compromising storage functionality
Solution Approach 2:
By applying local quality modification through the recessed portion, the design optimizes material distribution - using full material coverage only where storage capacity is critical and reducing material presence in non-critical areas, thus achieving cost-effective material usage while maintaining storage capacity
3Quantity of substance
If shelves extend farther out to maximize surface area, then the storage capacity is improved, but the likelihood of legs bumping the cart shelves increases
Solution Approach 1:
The shelf is divided into a full surface area portion for storage and a recessed portion at the trailing edge. This segmentation strategically removes material from the leg interaction zone while preserving storage surface area in non-interference zones, thereby eliminating leg obstruction harmful factors while maintaining storage capacity
Solution Approach 2:
The design converts the potentially harmful extension of shelves into leg-obstruction zones into a beneficial recessed clearance zone. By strategically recessing the trailing edge, the design transforms what would be a collision hazard into a useful leg clearance space, eliminating the harmful effect while preserving storage functionality
Data Source
AI summary
A utility cart has four corner posts arranged in rectangular pattern and at least one lower shelf including a recess in the push side edge and a top shelf that, instead of the recess, includes a handle. The other three sides of each of the shelves are substantially the same size and extend beyond the corner posts. The bottom of each of the shelves may include a wagon wheel structure in each corner which secures and supports the corner posts of the cart.