Rack-and-Pinion Refrigerator Drawer Alignment Against Wobble
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Solution Overview
Problem
Existing refrigerator drawer systems experience wobble and misalignment issues due to varying extension rates and lack of easy alignment mechanisms, leading to incomplete closure and inefficient temperature regulation.
Innovation Solution
A rack and pinion storage system with snap-fitting gear covers and axle-connected gear wheels that securely engage with rack gears, ensuring equal rotational and linear motion and preventing skewing, along with optional basket dividers for partitioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If slides are used to support the drawer, then the drawer can extend horizontally outwardly, but the slides extend at different rates causing wobble and instability
Solution Approach 1:
The patent replaces the conventional slide mechanism with a rack and pinion gear system. The rack gears are attached to the drawer and engage with pinion gears mounted on the cabinet sidewalls, converting the sliding motion into controlled rotational motion that ensures synchronized movement and eliminates wobble.
Solution Approach 2:
The patent changes the mechanical parameters of the drawer support system by introducing gear ratios and tooth engagement characteristics. The rack and pinion configuration transforms the extension motion into a controlled mechanical interaction that maintains equal extension rates and prevents lateral instability.
2Ease of manufacture
If the drawer is designed for easy assembly, then installation is simplified, but alignment of left and right components becomes difficult to ensure complete closure
Solution Approach 1:
The rack and pinion system is designed to be self-aligning during assembly. The gear teeth naturally guide the rack into proper alignment with the pinion, and the interlocking mechanism ensures that left and right components automatically position themselves correctly without requiring precise manual alignment or complex adjustment procedures.
3Device complexity
If a single rack and pinion is used, then the structure is simplified, but lateral force causes misalignment and wobble
Solution Approach 1:
The patent divides the single rack and pinion system into two separate, synchronized rack and pinion assemblies - one on the left side and one on the right side. Each rack is attached to the drawer and engages with its own pinion mounted on the cabinet sidewall, creating independent but coordinated support systems that collectively prevent lateral movement and wobble.
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 system provides stable, smooth drawer operation and complete closure, maintaining consistent linear velocity and preventing wobble, while allowing for easy assembly and alignment without requiring disassembly, even when filled with items.
Implementation Method 1
a gear assembly comprising two gear wheels attached at their respective hubs by an axle... the gear wheels are then aligned upon rack gears located on respective supports
Implementation Method 2
The gear covers are adapted to snap-fittingly engage respective retainers or mounting brackets extending from opposing sides of the storage basket
Data Source
AI summary
A rack and pinion storage system for use in a refrigerator compartment defined by a liner includes a pair of supports attached to opposing sidewalls of the liner. First and second gear covers snap-fittingly connect first and second gear wheels to respective first and second mounting brackets extending from a storage basket, such that the gear wheels are rotatably connected to the storage basket and have equal rotational and linear motion along the respective supports. Retaining bars extending from the storage basket are held within channels defined between the bottom walls of the supports and top walls of opposing telescoping slide assemblies used to movably support a door of the compartment. Tabs extending from the supports limit the sliding movement of the storage basket. A removable divider connects to the storage basket, sectioning the basket into multiple storage compartments.