Five-Bar Folding Mechanism With Quick-Release Unfolding
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Solution Overview
Problem
Existing five-bar mechanisms require manual intervention to overcome singularities during folding and unfolding, which complicates the process and limits user convenience.
Innovation Solution
Incorporation of an energy storage element, such as a spring or magnetic mechanism, to store mechanical energy when the arms approach a singularity, allowing for automatic unfolding without the need for end-stops, by releasing the stored energy to return the mechanism to its open configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual release of end-stop is used to allow folding through singularity, then the mechanism can be folded onto itself, but the operation becomes complex and time-consuming requiring manual intervention
Solution Approach 1:
The energy storage element automatically engages and stores energy during the folding process without requiring manual intervention. The system serves itself by using the mechanical energy from the folding motion to compress the spring, which then automatically returns the mechanism to its initial configuration, eliminating the need for user intervention.
Solution Approach 2:
The energy storage element is pre-positioned to engage with the actuated link at a predetermined angle before the singularity is reached. This preliminary engagement allows the spring to begin storing energy during the folding process, preparing the system for automatic return without requiring manual action at the critical moment.
2Adaptability or versatility
If manual return of actuated link is required after folding, then the mechanism can be unfolded, but the process becomes time-consuming and reduces productivity
Solution Approach 1:
The energy storage element automatically returns the actuated link to its initial position after folding by releasing the stored mechanical energy. This self-service mechanism eliminates the need for manual return operations, significantly reducing the time required for folding and unfolding cycles and improving overall productivity.
Solution Approach 2:
The mechanism enables rapid periodic folding and unfolding cycles through the automatic energy storage and release process. The spring-compression-return cycle repeats efficiently, allowing the mechanism to transition between folded and unfolded states rapidly without manual intervention, thereby increasing operational frequency and productivity.
3Device complexity
If hard end-stops are used to limit motion, then the mechanism workspace is constrained, but the structure becomes simpler
Solution Approach 1:
The energy storage element acts as an intermediary between the actuated link and the singularity point. Instead of using hard end-stops to physically block motion, the spring provides a compliant intermediate mechanism that stores energy during approach to singularity and facilitates smooth transition through and beyond the singularity, expanding the effective workspace without adding rigid structural constraints.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Facilitates easy and rapid unfolding of five-bar arms with minimal user input, eliminating the need for manual adjustments and expanding the workspace without using hard end-stops.
Implementation Method 1
an energy storage element coupled to the first arm and configured to be engaged by the second arm upon the angle being smaller than a designated angle, and to store mechanical energy upon said first arm and said second arm being brought further into co-alignment
Data Source
AI summary
Described are various embodiments of a five-bar folding mechanism and method with quick release functionality. In one embodiment, the mechanism is used with a five-bar linkage comprising a first arm and a second arm rotatively coupled to a same joint, the first arm and second arm defining an angle therebetween. The mechanism comprises an energy storage element coupled to the first arm and configured to be engaged by the second arm upon the angle being smaller than a designated angle, and to store mechanical energy upon said first arm and said second arm being brought further into co-alignment. The energy storage element is further configured to release the stored mechanical energy upon the five-bar linkage being unfolded, pushing the first arm and second arm apart.