Extensible table with central leaf
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Solution Overview
Problem
Existing outdoor tables with central extensions made of composite materials like HPL compact laminate deform due to humidity, leading to aesthetically unpleasant uneven surfaces when extensions are added or removed.
Innovation Solution
A table design featuring movable trays with edges having a tab and groove configuration, where the tab height increases then decreases, ensuring progressive alignment and rectification even when the trays or extensions are deformed, allowing for a flush and planar surface assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If composite materials like HPL compact laminate are used for outdoor tables with extensions, then the table can be used outdoors and resist rain, but the trays deform due to humidity causing uneven surfaces that are aesthetically unpleasant
Solution Approach 1:
The tray edge is segmented into multiple functional zones: a first half containing a tab and a second half containing a groove. This segmentation allows independent control of alignment and deformation compensation functions, enabling the structure to maintain surface alignment even when materials deform due to humidity exposure outdoors.
Solution Approach 2:
The tab is designed with variable height along its length, increasing from the distal edge to a central portion and then decreasing to the proximal edge. This parameter variation allows the tab to progressively engage with the groove, compensating for material deformation and ensuring flush alignment despite humidity-induced changes in the composite material dimensions.
2Ease of manufacture
If a simple and inexpensive design is provided for outdoor tables, then manufacturing cost is reduced, but ensuring perfect alignment when extensions are added or removed becomes more difficult
Solution Approach 1:
The tab and groove configuration enables self-alignment during assembly. When the extension is placed between the movable trays, the tab automatically engages with the groove and the progressive height variation causes the components to self-level, creating a planar surface without requiring precision adjustment or additional alignment mechanisms.
Solution Approach 2:
The tab is designed with asymmetric height distribution along its length, with the central portion being the highest point. This asymmetric geometry creates a self-correcting mechanism where the tab naturally settles into the groove at the correct alignment position, ensuring precision without complex assembly procedures.
Data Source
AI summary
A table with a central extension, includes a frame, two movable trays bearing on the frame and adapted to be brought close to one another to constitute a continuous surface on their own, or to be symmetrically brought away from each other, or independently of each other to enable the set-up of one or several so-called central extension(s) between the movable trays. The edges of the movable trays and of the extension(s) include at least one tab located on a first half of the edge and a groove located on a second half of the edge, the tab having a height increasing from its distal edge up to its central portion and decreasing from its central portion up to its proximal edge, and the depth of the groove being larger than the tab height, enabling an assembly by mortise-and-tenon joint even when the trays and/or the extension are deformed.