Snap-Fit Cover Cap Assembly for Medical Robotic Arm Protection
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Solution Overview
Problem
Existing covering caps for robot arms do not provide sufficient protection against impact and are difficult to mount securely, often requiring complex assembly with metal screws that are not suitable for medical environments.
Innovation Solution
A covering cap with a bevelled edge and three radially protruding latching noses that snap onto a base cap, made of glass-fiber-reinforced plastic, allowing tool-free attachment and improved durability, allowing tool-free attachment and improved durability, with snap-action connection to a base cap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal screws are used to fasten the covering cap to the robot arm, then secure fastening is achieved, but the metal screws do not meet medical requirements and can cause electrostatic charging
Solution Approach 1:
The patent replaces the mechanical screw fastening system with a snap-fit connection system. The covering cap includes a connection portion with protrusions that engage with recesses in the base cap, eliminating the need for metal screws and their associated electrostatic charging problems while maintaining secure fastening through elastic deformation of the plastic material
Solution Approach 2:
The patent changes the material parameter from metal to plastic (glass-fiber-reinforced plastic) for the fastening mechanism. This material substitution eliminates electrostatic charging while maintaining sufficient fastening strength through the elastic properties of the plastic material, allowing the connection to be made without metal components
2Object-affected harmful factors
If nylon screws with silicone covering are used instead of metal screws, then medical requirements are met, but the strength is significantly lower than metal screws
Solution Approach 1:
The patent replaces the screw fastening system (whether metal or nylon) with a snap-fit connection system. The connection portion with protrusions and recesses provides secure fastening through elastic deformation of the plastic material, achieving both medical compliance and sufficient strength without relying on threaded fasteners
Solution Approach 2:
The patent uses glass-fiber-reinforced plastic as the material for the covering cap and base cap. This composite material provides both the necessary strength and the medical compliance (non-conductive, non-electrostatic) in a single material system, eliminating the need to choose between metal screws and nylon screws
3Object-affected harmful factors
If screw-covering caps are mounted individually onto each screw head, then contact between surroundings and metal screws is avoided, but the assembly becomes complex and production costs rise
Solution Approach 1:
The patent merges the covering cap and the fastening mechanism into a single integrated component. The connection portion with protrusions is formed as one piece with the covering cap body, eliminating the need for separate screw-covering caps and reducing assembly steps to a simple snap-fit operation
Solution Approach 2:
The patent replaces the complex multi-component screw fastening system with a simple snap-fit connection. The protrusions engage with recesses through elastic deformation, providing both the covering function and fastening function in a single operation without requiring separate components
4Ease of operation
If three latching noses are provided for snap-action connection, then tool-free mounting and secure positioning are ensured, but the structure becomes more complex
Solution Approach 1:
The patent divides the connection interface into discrete protrusions and recesses. The connection portion includes multiple protrusions that correspond to recesses in the base cap, allowing the covering cap to be segmented into discrete engagement points that simplify the snap-fit operation while maintaining secure positioning
Solution Approach 2:
The patent uses asymmetric geometry in the protrusions and recesses to ensure proper orientation during assembly. The non-symmetric shapes guide the covering cap onto the base cap in the correct orientation and prevent incorrect assembly, simplifying the tool-free mounting process
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 covering cap provides secure, tool-free mounting and protection against mechanical stress, preventing damage to the underlying cap while ensuring easy assembly and disassembly, and avoiding electrostatic charging.
Implementation Method 1
The latching noses are radially elastically displaceable, in order to enter into, or to release, a latching engagement
Data Source
AI summary
The present disclosure relates to a cover cap (2) for a medical component, in particular for a robotic arm, with a circular cylindrical tube section (4) that is closed at its one longitudinal end and is formed open at its other longitudinal end and has an edge (6) terminating the tube section (4) at the open longitudinal end. wherein the edge (6) lies in a plane inclined in relation to a tube section longitudinal axis, and at least three catch tabs (8, 10, 12) arranged at a distance from one another over the circumference of the tube section (4) and projecting radially inward from the edge (6) for attaching the cover cap (2) by clip-on connection. The present disclosure also relates to an assembly kit having such a cover cap (2) and a base cap (40) over which the cover cap (2) can be seated.