Retractable Wheel Support Assembly for Full-Extension Freezer Drawer
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Solution Overview
Problem
Existing freezer drawer designs have limited sliding distance due to weight constraints, preventing full extension and accommodating larger items, while also risking tipping hazards and damage to sliding rails.
Innovation Solution
A retractable wheel support assembly is integrated into the drawer door, allowing the drawer to be fully extended while providing additional weight support and preventing rail damage, with the wheels retracting when the drawer is closed to maintain aesthetic appeal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the drawer is allowed to slide out further, then users can place larger items and access items more easily, but the sliding rails may become damaged or bent under heavy load
Solution Approach 1:
The patent applies a retractable wheel assembly that dynamically changes position based on drawer extension. When the drawer is pulled out, the wheel assembly extends to provide additional support points on the floor, preventing excessive stress on the sliding rails. When the drawer is pushed in, the wheel assembly retracts into the drawer body, maintaining a clean appearance and avoiding interference with the closed drawer. This dynamic adaptation resolves the contradiction by providing rail protection only when needed during extension.
Solution Approach 2:
The wheel assembly acts as an intermediary element between the drawer and the floor. Instead of allowing the drawer to directly stress the sliding rails during full extension, the wheels transfer part of the load to the floor through the extended wheel arms. This intermediary support mechanism protects the rails from damage while enabling full drawer extension, resolving the contradiction between ease of operation and rail integrity.
2Reliability
If the drawer is prevented from sliding out more than a small amount, then the sliding rails are protected from damage, but users cannot place desired items into the freezer
Solution Approach 1:
The retractable wheel assembly dynamically extends when the drawer is pulled out, providing floor-based support that enables full drawer extension. This dynamic support system allows the drawer to reach its full extension distance without risking rail damage, thereby increasing storage capacity and adaptability while maintaining rail protection through the conditional deployment of wheel support.
Solution Approach 2:
The patent introduces a vertical dimension of support by extending wheels downward to contact the floor, rather than relying solely on horizontal rail support. This dimensional change creates an additional support plane that enables full drawer extension without overloading the horizontal sliding rails, thus resolving the contradiction between rail protection and storage versatility.
3Adaptability or versatility
If a support structure is added to enable full drawer extension, then larger items can be accommodated, but the support may be visibly unappealing when not in use
Solution Approach 1:
The wheel assembly is designed to retract into the drawer body when not in use, transforming from a visible support structure to a concealed component. This dynamic retraction ensures that the support mechanism is only visible when the drawer is extended and needed, maintaining aesthetic appearance during closed or partially open states while enabling full extension capability when required.
Solution Approach 2:
The wheel assembly is nested within the drawer structure, with the ability to extend outward when needed and retract inward when not needed. This nesting arrangement allows the support mechanism to be hidden within the drawer's internal volume during closed states, preserving aesthetic appearance while providing structural support during full extension, thus resolving the contradiction between versatility and appearance.
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 solution enables the freezer drawer to be fully extended, accommodating larger items and heavier loads without increasing tipping risks, while also reducing the load on sliding rails and preventing damage.
Implementation Method 1
A spring may have a first end in contact with the housing and a second end. A rotation member may further comprise a shaft. The rotation member may be in contact with the second end of the spring, and the spring may bias the rotation member to move in a first direction.
Implementation Method 2
The caster wheel arm may rotate about the shaft of the rotation member with the spring bias in the first direction and against the spring bias in an opposite second direction.
Data Source
AI summary
A wheel support assembly for a bottom drawer is disclosed. When the bottom drawer is open, the wheel support assembly may provide support in a deployed position. When the bottom drawer is closed, the wheel support assembly may be retracted in a cavity to be invisible to consumers.