Folding table
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Solution Overview
Problem
Conventional foldable tables are less rigid in the unfolded use position and may sag or unintentionally fold during use, while requiring robust hinges that hinder storage folding.
Innovation Solution
A hinge mechanism with support beams and rotatable rods featuring intermeshing fingers that lock the tabletop in the use position and allow easy folding for storage, preventing sagging and facilitating smooth transition between use and storage positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a robust hinge mechanism is used to prevent sagging in the use position, then the table stability is improved, but the ease of folding for storage deteriorates
Solution Approach 1:
The hinge mechanism incorporates a locking system that dynamically changes its function based on the table's state. In the use position, the locking fingers engage with the hinge pin to prevent rotation and provide stability. In the storage position, the fingers disengage to allow free rotation for folding. This dynamic behavior resolves the contradiction by making the hinge both rigid when needed and flexible when needed.
Solution Approach 2:
The hinge mechanism changes its mechanical parameters (locking vs. unlocked state) based on the table's operational state. The locking fingers can engage or disengage from the hinge pin, effectively changing the hinge's stiffness and rotational resistance. This parameter change allows the same hinge structure to provide both stability during use and ease of folding during storage.
2Adaptability or versatility
If the table is designed to be foldable for storage, then the ease of storage is improved, but the rigidity in the use position deteriorates
Solution Approach 1:
The table is divided into two halves that can be folded relative to each other about a central axis. The hinge mechanism is positioned at this central axis, allowing each half to be independently positioned. This segmentation enables the table to transition between a rigid unfolded state for use and a compact folded state for storage, resolving the contradiction between adaptability and strength.
3Reliability
If a locking mechanism is added to prevent unintentional folding, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The locking mechanism is designed to be self-actuating through the natural movement of the table legs. When the legs are extended to the use position, the support rods automatically engage the locking fingers with the hinge pin, providing positive locking without requiring additional actuators or complex control systems. This self-service approach improves reliability while minimizing added complexity.
Data Source
AI summary
A tabletop having a first half and a second half that rotate about a central axis between an extended position and a storage position. The table includes a hinge disposed between first and second beams attached to the underside of the tabletop adjacent to the central axis. A first support rod is rotatably attached to the underside of the tabletop and has a proximal end attached to a first leg and a distal end having at least two first fingers projecting therefrom. A second support rod is rotatably attached to the underside of the tabletop and has a proximal end attached to a second leg and a distal end having one or more second fingers projecting therefrom. Upon rotation of the first and second legs between extended and collapsed positions, the at least two first fingers engage and disengage with the one or more second fingers.