Actuator Coupling Mechanism for Quick Element Decoupling
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Solution Overview
Problem
Existing coupling systems for extendable elements and actuators do not facilitate easy decoupling and re-coupling, making maintenance, cleaning, and component changes difficult, particularly in sampling devices where secure retention is required alongside bi-directional force application.
Innovation Solution
A split actuator housing with a rotatable retention collar and pin-groove mechanism allows for secure coupling and quick decoupling of extendable elements, enabling bi-directional force application while minimizing non-axial forces and preventing rotation of components during extension/retraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional coupling system is used to secure an extendable element to an actuator, then reliable retention and bi-directional force application are achieved, but decoupling and re-coupling become time-consuming and complex
Solution Approach 1:
The coupling system is divided into distinct modular components: a retention member with engagement features on the extendable element, and a corresponding retention structure on the actuator. This segmentation allows the elements to be securely coupled through interlocking features while enabling quick decoupling by simply separating the modular components without complex tools or procedures
Solution Approach 2:
A retention member acts as an intermediary component between the extendable element and the actuator. This retention member includes engagement features that interface with both the extendable element and the actuator, providing secure bi-directional force transmission while allowing for simplified coupling and decoupling operations through its designed engagement and disengagement mechanisms
2Reliability
If a traditional coupling system is used, then secure retention is achieved, but maintenance and component changes become difficult
Solution Approach 1:
The coupling system is divided into distinct modular components: a retention member with engagement features on the extendable element, and a corresponding retention structure on the actuator. This segmentation allows the elements to be securely coupled through interlocking features while enabling quick decoupling by simply separating the modular components without complex tools or procedures
Solution Approach 2:
The retention member can be independently extracted from the assembly by decoupling it from either the extendable element or the actuator. This extraction capability allows maintenance personnel to access and service individual components (such as replacing the extendable element or servicing the actuator) without having to disassemble the entire system, thereby simplifying maintenance procedures
3Ease of operation
If a simple coupling mechanism is used to enable quick decoupling, then ease of operation is improved, but secure retention and prevention of non-axial forces deteriorate
Solution Approach 1:
The engagement features utilize asymmetric geometry where the retention member has protrusions that fit into corresponding recesses on the actuator in a specific orientation. This asymmetric design provides secure retention and prevents rotation or non-axial forces during operation, while still allowing for easy decoupling by simply reversing the insertion motion or applying a simple release mechanism
Solution Approach 2:
The engagement features incorporate curved or rounded surfaces that guide the extendable element and retention member into proper concentric alignment during coupling. This curvature ensures that non-axial forces are minimized and that the components self-align during the simple decoupling and coupling operations, maintaining secure retention without complex alignment procedures
4Reliability
If a complex retention mechanism is used to prevent rotation and minimize non-axial forces, then reliability is improved, but device complexity increases
Solution Approach 1:
The engagement features utilize asymmetric geometry where the retention member has protrusions that fit into corresponding recesses on the actuator in a specific orientation. This asymmetric design provides secure retention and prevents rotation or non-axial forces during operation, while still allowing for easy decoupling by simply reversing the insertion motion or applying a simple release mechanism
Solution Approach 2:
Multiple functions are merged into the retention member: it provides mechanical coupling, prevents rotation through asymmetric engagement features, guides concentric alignment via curved surfaces, and transmits bi-directional forces. By combining these functions into a single integrated component rather than using separate mechanisms for each function, the overall device complexity is reduced while maintaining high reliability
Data Source
AI summary
A system and method for releasably coupling an extendable element to an actuator. Such a system may include an actuator housing with a specially adapted integral connecting end having a cavity therein. An extendable element may extend into the cavity through an opening in the connecting end of the housing and be coupled to a motive element of the actuator by a rotatable collar that resides in the cavity. A cover plate forms a part of the actuator housing connecting end. The cover plate compliments the integral portion of the connecting end and, in conjunction therewith, encloses the collar and the coupled portion of the extendable element. A substantially hollow end cap is passed over the extendable element and releasably attached to the actuator housing to enclose the distal connecting end thereof. In some embodiments, the coupled extendable element may reciprocate within an outer tube that is also releasably attached to the actuator housing.