Domed Actuator Surface for Accurate Dosage Tracking
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Solution Overview
Problem
Existing dispensing devices face challenges in providing accurate indication of the number of doses remaining or dispensed, due to frictional forces caused by off-center actuation, which can lead to uncounted actuations or incorrect dosage tracking.
Innovation Solution
The design incorporates a second housing component with a convex domed actuation surface and a lubricant, allowing for minimal frictional forces by requiring actuation close to the center axis or a combination of longitudinal and lateral forces, ensuring uniform actuation force and accurate dosage tracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the actuation surface is flat, then it is easy to manufacture, but off-center actuation causes friction and inaccurate dosage tracking
Solution Approach 1:
The actuation surface is designed with a convex domed shape instead of a flat surface. This curvature ensures that forces applied at various points on the surface converge toward the central axis, preventing tilting of the first housing component relative to the second housing component during actuation. The curved geometry naturally guides off-center forces to act along the central axis, eliminating friction caused by tilting while maintaining manufacturing feasibility through molding processes.
2Ease of operation
If the actuation force is minimal, then the device is easy to operate, but it may count actuations that have not actually occurred
Solution Approach 1:
The convex domed actuation surface concentrates applied forces toward the central axis, ensuring that even minimal actuation forces are effectively transmitted along the intended path. This prevents spurious lateral forces that could cause false actuations, while the smooth curved surface allows for easy, intuitive pressing motion. The geometry ensures that force magnitude and direction are optimized for reliable operation.
3Ease of operation
If the actuation surface allows off-center forces, then it is easier to operate, but friction increases and actuation force becomes non-uniform
Solution Approach 1:
The convex domed surface geometry transforms off-center application forces into axial forces along the central axis. When a user presses anywhere on the domed surface, the normal force vector at the contact point directs toward the center of curvature, which aligns with the central axis. This ensures uniform actuation force transmission regardless of where on the surface the user applies force, while maintaining ease of operation through the ergonomic curved shape.
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
This configuration reduces frictional forces, ensuring accurate and reliable indication of remaining or dispensed doses, preventing uncounted actuations and maintaining consistent actuation force, thus addressing the accuracy issues in existing devices.
Implementation Method 1
The exposed actuation surface of the second housing component includes a lubricant
Data Source
AI summary
An indicating device includes a first housing component adapted to be mounted to a container and a second housing component moveably connected to the first housing component. The second housing component is moveable relative to the first housing component along an axial path. The second housing component includes an exposed actuation surface having a substantially convex domed shape. The exposed actuation surface of the second housing component can include a lubricant. A method of actuating an indicating device is also provided.