Rack-and-Pinion Refrigerator Drawer for Wobble-Free Extension
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Solution Overview
Problem
Existing refrigerator drawer systems experience 'wobble' due to uneven extension rates and misalignment issues, leading to incomplete closure and inefficient temperature regulation, with current solutions requiring complex mechanisms or significant effort for realignment.
Innovation Solution
A rack and pinion storage system with snap-fitting gear covers and axle-connected gear wheels that align with rack gears, providing stable and equal rotational and linear motion, preventing wobble and ensuring proper alignment without disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If slides are used for drawer extension, then drawer accessibility is improved, but drawer stability deteriorates due to wobble from uneven extension rates
Solution Approach 1:
A rack and pinion mechanism is introduced as an intermediary between the drawer and slides. The rack gear is attached to the drawer bottom and engages with pinion gears on the slides, converting the uneven linear motion of the slides into synchronized rotational motion of the pinions, which in turn drives the drawer at equal rates on both sides, eliminating wobble while preserving accessibility
Solution Approach 2:
The system changes the motion parameter from direct linear extension to gear-mediated synchronized extension. By introducing the rack and pinion gear train, the extension velocity parameter is equalized across both sides of the drawer, transforming the uneven extension rate into a controlled, synchronized motion that prevents wobble
2Stability of the object's composition
If gear wheels are used to prevent wobble, then drawer stability is improved, but alignment difficulty increases requiring complex assembly procedures
Solution Approach 1:
The rack gear is pre-attached to the drawer bottom during manufacturing, and the pinion gears are pre-mounted on the slide assemblies. This preliminary preparation ensures that when the drawer is installed, the gear components are already in their correct positions and orientations, eliminating the need for complex alignment procedures during final assembly
Solution Approach 2:
The gear system is designed to self-align during installation. The rack and pinion geometry inherently guides the components into proper engagement, and the system automatically compensates for minor positioning variations, eliminating the need for precise manual alignment or complex adjustment mechanisms
3Reliability
If drawer components are misaligned, then complete closure is prevented, but temperature regulation efficiency deteriorates
Solution Approach 1:
The rack and pinion mechanism provides mechanical feedback that ensures synchronized movement of both drawer sides. As one side moves, the gear engagement automatically drives the other side to move at the same rate, providing real-time feedback that prevents misalignment and ensures complete closure, which in turn maintains proper temperature regulation
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 ensures smooth drawer operation and complete closure, maintaining consistent velocity and preventing rotational skew, thus enhancing temperature control and storage efficiency.
Implementation Method 1
a rack and pinion system has been available
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.