A trigger-type dispensing head for a dispensing device for pasty products such as toothpastes
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Solution Overview
Problem
Existing toothpaste dispensers, particularly those using plastic materials, face challenges in effectively dispensing pasty products, especially with regard to suction and environmental sustainability.
Innovation Solution
A dispenser design featuring a container tube and dispensing head made from polyolefin-based plastics, incorporating a suction valve system with deformable caps and valves, ensuring effective product dispensing and suction phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a trigger mechanism is added to control dispensing, then dosing accuracy is improved, but device complexity increases
Solution Approach 1:
The dispensing head is divided into functionally independent modules: a trigger mechanism for controlled actuation, a piston for dose delivery, and a valve system for flow control. This segmentation allows each component to perform its specific function efficiently while maintaining overall system accuracy and manageability.
Solution Approach 2:
The trigger mechanism is designed to automatically reset after actuation, and the piston-return mechanism self-primers the chamber for the next dose without requiring additional user actions or complex control systems. This self-service capability maintains dosing accuracy while minimizing the complexity of control mechanisms.
2Ease of operation
If the dispensing head can be detached and replaced, then ease of operation is improved, but reliability may worsen due to potential improper reassembly
Solution Approach 1:
The connection interface between the dispensing head and handle employs asymmetric geometry with specific engagement features that allow assembly in only one correct orientation. This asymmetric design ensures reliable reassembly after detachment while maintaining the ease of replacement, as users cannot incorrectly assemble the components.
Solution Approach 2:
The dispensing head contains nested components where the piston assembly is housed within the valve body, and the entire assembly nests within the handle when attached. This nested structure provides natural alignment and positioning features that ensure reliable reassembly while keeping the replacement process simple and intuitive.
3Manufacturing precision
If the piston is pre-assembled with the valve body, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The piston and valve body are pre-assembled as an integrated unit during manufacturing with precise alignment and sealing surfaces already established. This preliminary assembly ensures high manufacturing precision for the critical dosing components while allowing the overall device to remain relatively simple in structure and easy to replace as a complete unit.
Data Source
Figure 1~2
Figure 3a
Figure 3b
AI summary
A dispenser (1) for pasty products such as toothpastes comprises a fixed head (40) having a dispensing duct (42) dispensing the product, a pump (28) with an elastically deformable cap (54), a manually-actuated actuator (80), a separating wall (24) with a suction inlet (24a), and a suction valve that cooperates with the delivery outlet (24a). The suction valve comprises a valve body (73) and a plurality of tabs (77', 77'') that bend and open the suction inlet (24a) in the product suction phase, and close the suction inlet (24a) in the product dispensing phase.