Fold-in-Half Table Central Support Tube for Simplified Molding
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Solution Overview
Problem
Conventional fold-in-half tables with interlocking and overlapping features on the tabletop halves increase manufacturing complexity and cost, and make it difficult to remove plastic burs, especially when these features are located at the mold separation line, which is more efficient with straight edge surfaces.
Innovation Solution
A collapsible table design featuring straight inner edges on the tabletop halves without interlocking features, supported by a serpentine-shaped central support tube and pivotally connected leg assemblies that allow the table to fold efficiently for storage and expand for use, with the central support tube providing structural integrity without the need for complex mold features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If interlocking and overlapping features are added to tabletop halves, then tabletop rigidity is improved, but manufacturing complexity and cost increase
Solution Approach 1:
A central support tube is introduced as an intermediary element positioned at the hinge axis between tabletop halves. This tube provides the necessary structural support and rigidity to the tabletop assembly without requiring complex interlocking features to be molded into the tabletop halves themselves, thereby simplifying the mold design while maintaining strength.
2Strength
If interlocking features are located at the mold separation line, then tabletop rigidity is improved, but bur removal difficulty increases
Solution Approach 1:
The support function is extracted from the tabletop half moldings and relocated to a separate central support tube component. This extraction removes the need for complex interlocking features at the mold separation line, allowing for straight edge surfaces that are much easier to manufacture and clean of burrs.
3Productivity
If straight edge surfaces are used instead of interlocking features, then manufacturing efficiency is improved, but tabletop rigidity may be reduced
Solution Approach 1:
The central support tube acts as a mediator that compensates for the loss of rigidity from using simple straight edge surfaces instead of complex interlocking features. The tube provides the necessary structural reinforcement at the critical hinge axis location, maintaining tabletop strength while enabling simpler, more efficient manufacturing processes.
Data Source
Figure 1~2
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AI summary
A collapsible table (10) has first (12a) and second (12b) tabletop portions. A pair of first side rails (30a, 32a) is attached to the first tabletop portion, and a pair of second side rails (30b, 32b) is attached to the second tabletop portion. First (14) and second (16) leg assemblies are pivotally connected between the first and second side rails. A pair of hinges (34, 36) rotatably connect the first side rails to the second side rails along a hinge axis (44). A central support tube (38) having a longitudinal centerline includes one or more first tubular portions (38a) in which the longitudinal centerline of the central support tube is disposed to one side of the hinge axis toward the first tabletop portion, and one or more second tubular portions (38b) in which the longitudinal centerline of the central support tube is disposed to an opposing side of the hinge axis toward the second tabletop portion. The one or more first tubular portions support the first tabletop portion at its inner edge, and the one or more second tubular portions support the second tabletop portion at its inner edge.