Trigger Dispensing Device Anti-Loosening Auxiliary Body
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Solution Overview
Problem
Existing trigger dispensing devices for liquids face issues with the threaded ring-nut connection between the dispensing head and bottle becoming loose due to external shocks and vibrations, leading to potential separation and spillage.
Innovation Solution
The device incorporates an auxiliary body with radially opposed teeth and windows that snap engage with the bottle's neck, preventing relative rotation and axial separation, ensuring a reliable threaded connection using a ring-nut that is not easily unscrewed by external actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a threaded ring-nut connection is used to attach the dispensing head to the bottle, then the assembly is simple and easy to manufacture, but the connection becomes loose due to external shocks and vibrations during transport and handling
Solution Approach 1:
The connection system is divided into two independent functional elements: a threaded ring-nut for simple assembly and a separate auxiliary body with teeth and windows for anti-loosening. The auxiliary body segments the anti-loosening function from the threading function, allowing each to optimize its specific purpose without compromising the other.
Solution Approach 2:
The auxiliary body acts as an intermediary element between the ring-nut and the bottle neck. It mediates the connection by providing a positive engagement mechanism (teeth in windows) that prevents relative rotation and axial separation, while allowing the ring-nut to maintain its simple threaded attachment function.
2Reliability
If the ring-nut is made secure against loosening, then connection reliability improves, but the device complexity increases due to additional components
Solution Approach 1:
The auxiliary body combines multiple functions into a single component: it provides both the anti-rotation mechanism (teeth engaging with windows) and the axial positioning (shoulder abutting the crown surface). This merging reduces the number of separate parts needed while achieving multiple protective functions simultaneously.
Solution Approach 2:
The auxiliary body serves multiple purposes: it prevents relative rotation through tooth-window engagement, prevents axial separation through shoulder-crown surface contact, and provides a mounting surface for the ring-nut. This multi-functionality reduces overall system complexity while enhancing reliability.
3Productivity
If the connection allows high-speed screwing during production, then productivity increases, but the connection may loosen under external actions during use
Solution Approach 1:
The assembly process is segmented into two phases: a high-speed threaded attachment phase using the ring-nut, followed by a secure engagement phase where the auxiliary body's teeth snap into the windows. This segmentation allows rapid initial assembly while ensuring subsequent security against loosening.
Solution Approach 2:
The preliminary threaded attachment using the ring-nut enables high-speed assembly during production. The subsequent engagement of the auxiliary body's teeth with the windows serves as a preliminary security measure that prevents loosening before the product even leaves the production line, let alone during transport and use.
Data Source
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AI summary
A head (4) of a trigger dispensing device for liquids comprises an auxiliary body (30) for the connection with a neck (10) of a bottle (2). The auxiliary body (30) comprises a closure base (32) suitable to close a mouth (13') of the bottle (2) and dual constraint means suitable to snap-engage with the neck (10) forming between the auxiliary body (30) and the neck (10) a constraint both to the relative rotation and to the separation thereof.