Modular Rotatable Joint With Pivot Locking for Collapsible 3D Frames
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Solution Overview
Problem
Existing rotatable joints for modular systems lack the ability to efficiently assemble and collapse three-dimensional structures without disconnecting bars, and often require complex locking mechanisms to restrict rotation within specific planes.
Innovation Solution
A modular rotatable joint system comprising a central pivot and multiple bar connectors, where bushings with keyways and prongs allow for free rotation and locking, enabling the assembly of three-dimensional structures that can be easily collapsed by aligning bars perpendicular to the pivot, and a spring mechanism for secure connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If existing rotatable joints are used for modular systems, then rotation is enabled, but the ability to efficiently assemble and collapse three-dimensional structures without disconnecting bars is lacking
Solution Approach 1:
The joint is divided into separate functional components: a body portion with a central pivot, multiple bar connectors positioned at different orientations, and an integrated locking mechanism. This segmentation allows each component to perform its specific function independently while contributing to the overall efficiency of assembly and collapse operations.
Solution Approach 2:
The locking mechanism is merged with the bar connectors and central pivot structure, eliminating the need for separate locking components. This integration allows the joint to lock and unlock bars in specific planes without adding external complexity, enabling efficient assembly and collapse of three-dimensional structures.
2Reliability
If complex locking mechanisms are added to restrict rotation within specific planes, then rotation control is improved, but device complexity increases
Solution Approach 1:
The locking mechanism provides rotation control only in specific planes where it is needed, while allowing free rotation in other directions. This localized control approach restricts rotation within specific planes without requiring complex mechanisms that would control rotation in all directions, maintaining simplicity while improving reliability.
Solution Approach 2:
The bar connectors are designed to automatically engage with the central pivot and lock into position when bars are inserted. The mechanism uses the insertion motion itself to trigger the locking action, eliminating the need for separate locking operations or complex control systems, thus improving rotation control precision without increasing device complexity.
Data Source
Figure 1A
Figure 1B~1E
Figure 1F
AI summary
A rotatable joint, comprising: at least three bar connectors; an axis piece comprising a central pivot and at least one of the at least three bar connectors longitudinally aligned with the central pivot; and two rotatable joint pieces each comprising a bushing and at least one of the at least three bar connectors oriented along the diameter of the bushing and aligned along the axis of symmetry of the bushing, wherein the bushing of each of the two rotatable joints pieces is configured to slide over the central pivot thereby coupling the two bushings with the central pivot and allowing the rotatable joint pieces to rotate about the central pivot, and orient the bar connectors of the rotatable joint pieces perpendicular to the bar connector of the axis piece.