Rack-and-Pinion Drawer Assembly to Prevent Slanting
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Solution Overview
Problem
Drawer assemblies in cabinet structures often experience slanting during horizontal movement due to mismatched rates of sliding mechanisms, leading to potential sticking issues.
Innovation Solution
A drawer assembly design featuring a rack-and-pinion mechanism with circumferential teeth, guided by a groove and wall, and coupled pinions, along with linear motion elements and a timing bar, ensures synchronized movement and prevents tilting by using markings for alignment and a telescoping mechanism for precise assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional sliding mechanisms are used for drawer movement, then the drawer can move horizontally, but the drawer becomes slanted and may get stuck when the two slides move at different rates
Solution Approach 1:
The patent combines two independent sliding mechanisms into a synchronized system using a timing bar that couples the pinions together. This merging ensures that both slides move at the same rate, preventing drawer slanting while maintaining horizontal movement capability.
Solution Approach 2:
The timing bar acts as a feedback mechanism that monitors and equalizes the movement of both slides. When one slide lags or leads, the coupled pinions automatically adjust through the timing bar to maintain synchronized movement, preventing the drawer from becoming stuck.
2Reliability
If synchronized pinion rotation is implemented using a timing bar, then the drawer moves evenly without slanting, but the assembly complexity increases
Solution Approach 1:
The timing bar serves as an intermediary component that couples the two pinions together. This simple mediator element achieves synchronized rotation without requiring complex control systems, sensors, or actuators, thus minimizing the increase in device complexity while ensuring reliable synchronized movement.
3Manufacturing precision
If groove and wall guidance structure is added to the teeth, then the pinion alignment precision is improved, but the manufacturing complexity increases
Solution Approach 1:
The groove and wall features are pre-formed during the molding or machining of the rack and pinion components. This preliminary action ensures precise alignment during assembly without requiring additional alignment steps or complex adjustment procedures, making the increased precision achievable with minimal impact on manufacturing ease.
Data Source
AI summary
A drawer assembly is provided for an enclosure which includes a first interior surface and a second interior surface which are opposite one another. The drawer assembly includes a drawer, a first rack, a second rack, a first linear motion element and a second linear motion element. The drawer is configured to be insertable in the enclosure. The first rack and the second rack are mounted respectively near the first interior surface and the second interior surface. The first linear motion element and the second linear motion element are mounted respectively near the first interior surface and the second interior surface. Each of the linear motion elements is configured to enable movement of the drawer in and out of the enclosure. Each of the linear motion elements includes a pinion configured to rotate along a corresponding rack as the drawer is moved in and out of the enclosure.