Refrigerator Drawer Gear Synchronization to Prevent Racking
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Solution Overview
Problem
Conventional pull-out drawers in consumer appliances, such as refrigerators, often misalign due to off-center pulling forces, leading to racking and improper sealing, and existing solutions like gear and cross shaft assemblies reduce usable compartment volume.
Innovation Solution
A gear assembly with a pinion gear having a vertically displaced rotational axis and a crossbar connecting opposite pinion gears, which transmits off-center forces to maintain drawer alignment without reducing compartment space, allowing for efficient use of space even with features like ice buckets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gear and cross shaft assembly is used to synchronize slide mechanisms, then drawer misalignment and racking are minimized, but usable compartment volume is reduced
Solution Approach 1:
The patent relocates the cross shaft from a horizontal orientation (spanning the width of the drawer) to a vertical orientation. This dimensional change allows the synchronization mechanism to occupy vertical space rather than horizontal space, thereby preserving usable compartment volume while maintaining the anti-racking function through vertical gear engagement with the slide mechanisms.
Solution Approach 2:
The gear assemblies are pre-mounted to the slide brackets with vertical pinion gears that engage with horizontally extending gear rails. This preliminary configuration ensures that synchronization action is automatically initiated through the gear meshing mechanism, eliminating the need for separate synchronization components and reducing space requirements.
2Ease of operation
If off-center pulling force is applied to the drawer, then drawer movement is initiated, but misalignment and binding occur
Solution Approach 1:
The gear-rail engagement creates a mechanical feedback system where the vertical pinion gears on opposite sides of the drawer are coupled through the vertical cross shaft. When off-center force is applied, the gear meshing provides immediate mechanical feedback that guides the drawer back into proper alignment, ensuring that the pulling force is distributed evenly across both slide mechanisms.
Solution Approach 2:
The synchronization mechanism creates equipotential conditions by ensuring that both slide mechanisms experience equal resistance and force distribution through the cross shaft connection. This equalizes the mechanical potential across the drawer assembly, preventing binding and misalignment even when initial force application is off-center.
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
This configuration effectively minimizes drawer misalignment and binding while maintaining ample compartment volume for storage features, ensuring smooth drawer movement and proper sealing without compromising space.
Implementation Method 1
each gear assembly having a first gear engaged with the gear rail and a pinion gear engaged with the first gear. The pinion gear has a rotational axis that is vertically displaced from a rotational axis of the first gear. A cross bar is connected between opposite pinion gears. In this manner, a driving force generated at one gear assembly from an off-center pulling force on the drawer is transmitted through the cross bar to the opposite gear assembly.
Data Source
AI summary
A consumer appliance, for example a refrigeration appliance, includes a compartment with a pull-out drawer. A slide member is configured on each opposite side of the compartment, with the drawer having a slide bracket mounted to each respective slide member for movement of pull-out drawer into and out of the compartment. A gear rail is configured on each opposite side of the compartment adjacent to the slide member. A gear assembly is mounted to each slide bracket and includes a first gear engaged with the gear rail and a pinion gear engaged with the first gear. The pinion gear has a rotational axis that is vertically displaced from the rotational axis of the first gear. A cross bar is connected between the pinion gears.