Drawer Pullout Mechanism With Pre-Tensioned Wheels Against Jamming
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Solution Overview
Problem
Existing pullout mechanisms for drawers and drawer devices often experience tilting and jamming issues during operation, which are not effectively addressed by current technologies.
Innovation Solution
A pullout mechanism featuring a rotationally fixed connection between wheels and guide surfaces, where pulling devices are pre-stressed to the ends of the guide surfaces, preventing separation and allowing for motor-driven synchronization to prevent tilting and jamming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wheels are allowed to move freely on guide surfaces, then ease of operation is improved, but tilting and jamming occur during pulling out and pushing in
Solution Approach 1:
The pulling device is pre-tensioned before operation to establish a preliminary pressing force between the wheels and guide surfaces. This pre-applied force ensures that the wheels remain in firm contact with the guide surfaces throughout the drawer's movement, preventing tilting and jamming while maintaining smooth operation.
2Strength
If multiple wheels are used for drawer support, then load distribution is improved, but synchronization difficulties cause tilting
Solution Approach 1:
Multiple wheels are connected through a common pulling device that applies a unified pre-tensioning force to all wheels simultaneously. This merging of the control mechanism ensures that all wheels are pressed against their respective guide surfaces with coordinated force, maintaining synchronization and preventing tilting while supporting the drawer load.
3Ease of operation
If motor drive is added for automated drawer operation, then ease of operation is improved, but synchronization variations between motors cause tilting
Solution Approach 1:
The mechanical pre-tensioning system is established before motor operation begins. This preliminary mechanical constraint creates a rigid coupling between the motors and the drawer, ensuring that even if motors operate independently, the pre-established mechanical relationship prevents tilting by maintaining consistent wheel-guide surface contact across all wheels.
Data Source
AI summary
A pullout mechanism for a drawer device includes a first and second guide surfaces, each extending from a first end to a second end, and first and second wheels which run on the respective first and second guide surfaces. The wheels are connected together in a rotationally fixed manner by a shaft mounted to the drawer device. The guide surfaces are provided for attachment to or formation on a frame, such as a frame of an interior trim part of a vehicle. Alternatively, the wheels can be connected to the frame and the guide surfaces to the drawer device. The pullout mechanism further includes first and second pulling devices such as cables, each of which at least partially encircles the first and second wheels, respectively, and is fastened in a pre-stressed manner to the two ends of the respective first and second guide surfaces.