Segmented Four-Bar Closure Mechanism for Jam-Resistant Sealing
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Solution Overview
Problem
Existing aperture-type closure mechanisms are prone to contamination, jamming, and have unfavorable flow profiles, making them unsuitable for applications involving viscous or doughy substances, and they often require complex and costly constructions.
Innovation Solution
A closure mechanism utilizing a four-bar linkage with pivoting levers and a cam mechanism, where segments move independently and synchronously, allowing for a nearly circular opening without slots, and can be closed fluid-tightly or gas-tightly, using a cam mechanism and pivoting levers to ensure smooth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If segments are pressed against one another on lateral faces to obtain tightness, then sealing performance is improved, but segments easily jam one another
Solution Approach 1:
The closure mechanism divides the closure into multiple independent segments that can move separately. Each segment is guided independently by its own linear guide, allowing them to move outward without pressing against each other's lateral faces, thus preventing jamming while maintaining sealing capability through the guided motion and tip arrangement.
Solution Approach 2:
Linear guides are introduced as intermediary elements between the segments and the drive mechanism. These guides constrain the motion of each segment to a specific path, ensuring that segments move outward smoothly without lateral contact that would cause jamming, while still allowing the tips to maintain contact for sealing.
2Ease of operation
If rolling guides are used instead of friction guides, then motion smoothness is improved, but sensitivity to contamination increases
Solution Approach 1:
The patent employs simple friction-based linear guides rather than complex rolling guides. While friction guides are less smooth, they are much more resistant to contamination and do not require precise maintenance. The simplicity of the linear guide design makes it robust for environments where contamination is a concern, trading some motion smoothness for contamination resistance.
3Ease of operation
If multiple linear guides are used for each segment, then motion control is improved, but device complexity and cost increase
Solution Approach 1:
Each linear guide serves multiple functions: it guides the segment's outward motion, provides structural support, and maintains the segment's orientation. The linear guides are integrated into the overall structure, reducing the need for additional separate components. This multi-functional design reduces overall complexity despite the presence of multiple guides.
4Reliability
If segments are arranged to close completely at the center, then closure tightness is improved, but activation stroke increases
Solution Approach 1:
The segments are designed with curved lateral faces that converge toward the center. This curvature allows the segments to close completely at the center with a more compact arrangement, reducing the required activation stroke compared to linear segment arrangements. The curved geometry enables efficient space utilization while maintaining complete closure capability.
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
The mechanism is highly resistant to contamination, minimizes jamming, and enables rapid activation with minimal activation strokes, providing a stable and efficient closure for various substances, including viscous and doughy materials, with a compact and cost-effective design.
Implementation Method 1
a second pivoting lever, which by way of a cam mechanism is mechanically coupled in a movable manner to the first base
Implementation Method 2
each segment is a central part of a dedicated four bar linkage and has a first and a second articulation point
Data Source
AI summary
A closure mechanism for an opening defined by a center and an outer edge, includes multiple segments which can all together close the opening. Each segment has a first pivot lever and a second pivot lever and is controlled by the pivoting movements thereof. The segment along with its pivot levers forms a four-bar linkage. All first pivot levers are attached to a first base and all second pivot levers are attached to a second base. The relative movement between the first base and the second base leads to a drive movement for the pivot levers, wherein the second pivot lever is mechanically coupled to the first base via a cam gearing mechanism.