Monolithic Lever Pawl Ejection Mechanism Hygiene
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Solution Overview
Problem
Existing devices for ejecting liquid or pasty products, such as dental syringes, face challenges including complex and costly production, difficult cleaning and sterilization due to intricate designs, and inefficiencies in ejection mechanisms, which compromise hygiene and efficiency.
Innovation Solution
A simplified disposable ejection device with a monolithic plastic lever and pawl structure, elastic blades for assembly and locking, and a two-stage ejection mechanism, allowing for easy assembly, efficient ejection, and enhanced hygiene, manufactured from recyclable plastic materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex mechanism with multiple parts and angles is used for ejection, then the ejection function is achieved, but the device becomes difficult to clean and sterilize
Solution Approach 1:
The patent merges the lever and pawl into a single monolithic articulated structure made of one piece of material. This eliminates the need for separate parts and complex assemblies, making the device much easier to clean and sterilize while maintaining the ejection function through the integrated articulated mechanism
Solution Approach 2:
The device is divided into separable components (body, cap, articulated lever-pawl structure) that can be easily detached for cleaning and sterilization, allowing each segment to be processed independently
2Ease of manufacture
If a removable articulated lever is used to facilitate cleaning, then the cleaning process is simplified, but the ejection efficiency decreases due to less secure holding under significant forces
Solution Approach 1:
The lever and pawl are combined into a single monolithic structure that remains securely attached during ejection while still allowing access to the articulation point for cleaning purposes
3Adaptability or versatility
If multiple separate components are used for the ejection mechanism, then the device can be assembled and distributed, but the production becomes complex and costly
Solution Approach 1:
The lever and pawl are manufactured as a single monolithic component, significantly reducing the number of parts that need to be produced, inventoried, and assembled, thereby simplifying production and reducing costs while maintaining distribution flexibility
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 device achieves high ejection efficiency, improved hygiene, and cost-effective production, with a simplified structure that is easy to assemble and dispose of, addressing the limitations of previous devices by ensuring effective cleaning and efficient product delivery.
Implementation Method 1
a lever (1) able to rotate about an axis (5), provided with a return spring (21)
Implementation Method 2
at least one elastic blade (21) allowing the axis (5) of the lever (1) to be clipped into the housing (6) of the body (2b)
Data Source
Figure 1a~1d
Figure 2~4
Figure 5~6
AI summary
Device for ejecting a liquid or pasty product, comprising a body (2) that has a portion (2a) designed to contain the product to be ejected and that has a hole (13) for ejecting the product, a rack (3) that moves in a bore (20) in the body (2) and causes the volume of the portion (2a) designed to contain the product to vary, and a rack (3) movement mechanism comprising a pivoting lever (1) and a pawl (4) for acting on the rack (3), which device is characterized in that the pawl (4) and the lever (1) form a one-piece plastics structure.