Medicament Delivery Device Flash and Chamfer Interaction
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Solution Overview
Problem
Medicament delivery devices with injection-molded plastic components often have manufacturing defects like flashes, which can hinder operation, especially for users with impaired finger capabilities or reduced strength, and require additional machining steps for defect removal.
Innovation Solution
A medicament delivery device design featuring a first component with a radially extending flash and a second component with a chamfer aligned to facilitate axial movement, reducing the force required for operation and ensuring intended function, particularly for users with impaired physical abilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If injection moulding is used to manufacture plastic components, then production efficiency is improved, but manufacturing defects such as flashes occur
Solution Approach 1:
The patent converts the harmful flash defect into a beneficial feature by designing a chamfer on the second component that aligns with and utilizes the flash. The flash, instead of being removed as waste, works together with the chamfer to reduce friction and facilitate axial movement between components, thereby improving ease of operation while maintaining injection moulding efficiency
2Manufacturing precision
If machining is used to remove manufacturing defects, then component quality is improved, but additional process steps are required
Solution Approach 1:
Instead of removing the flash through additional machining steps, the patent incorporates the flash into the functional design by aligning it with a chamfer on the second component. This eliminates the need for post-moulding machining operations while maintaining or improving component functionality, thereby reducing manufacturing process complexity
3Strength
If components have perpendicular edges, then structural integrity is improved, but ease of operation deteriorates due to increased friction
Solution Approach 1:
The patent applies local quality by modifying only the specific region where components interact axially. The chamfer is applied locally at the interface between the first and second components, creating a localized friction-reducing feature that does not compromise the overall structural integrity of the components while significantly improving ease of operation
4Ease of manufacture
If flashes are present on components, then manufacturing cost is reduced, but operation difficulty increases for users with impaired abilities
Solution Approach 1:
The patent transforms the flash, which would normally be a harmful defect increasing operation difficulty, into a beneficial feature that reduces friction. By aligning the flash with a chamfer on the second component, the design creates a lubricating effect that facilitates axial movement, thereby maintaining low manufacturing costs while improving ease of operation for users with impaired abilities
Data Source
AI summary
A medicament delivery device comprising: a first component, and a second component arranged concentrically with the first component, wherein the second component is configured to move axially relative to the first component from a first position to a second position, wherein one of the first component and the second component has a radially extending flash, wherein the other one of the first component and the second component has a chamfer aligned with and facing the flash when the second component is in the first position, and wherein one of the chamfer and the flash is configured to contact and subsequently pass the other one of the chamfer and the flash when the second component is moved from the first position towards the second position to thereby facilitate movement of the second component.