Child-Resistant Dispenser With Dual-Stage Valve
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Solution Overview
Problem
Existing child-resistant dispensers for dangerous liquids are ineffective as children can learn to open them, and individuals with weak hand strength may struggle, leading to accidental access to the contents, with studies showing high poisoning rates among young children and older adults.
Innovation Solution
A dispenser design featuring a valve assembly with a conduit and reservoir that requires specific movements to open, ensuring liquid communication only when the closure is in the open position, incorporating a bias mechanism and cooperative engagement formations to prevent accidental dispensing, and a secondary safety feature accessible after the primary safety feature is removed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a child-resistant lid requiring sequence movements is used, then child access to dangerous contents is inhibited, but individuals with weak hand strength cannot remove the lid and may leave it in an intermediate configuration
Solution Approach 1:
The safety mechanism is divided into two distinct functional parts: a child-resistant closure system that requires sequence movements to open, and a separate valve assembly with its own safety feature that requires a different sequence of movements. This segmentation ensures that even if one safety mechanism is compromised, the other remains effective.
Solution Approach 2:
The valve assembly acts as an intermediary safety mechanism between the closure and the liquid contents. Even when the closure is opened, the valve assembly remains closed by default and requires a specific pulling action to open, providing an additional layer of protection against accidental dispensing.
2Object-affected harmful factors
If a child-resistant lid requiring simultaneous opposing movements is used, then child access to dangerous contents is inhibited, but ease of operation for all users is reduced
Solution Approach 1:
The closure mechanism utilizes dynamic movement sequences rather than static opposing forces. The first movement (pushing down) activates a cam mechanism that releases the second movement (pulling up), making the operation sequential and dynamic rather than requiring simultaneous opposing forces.
Solution Approach 2:
The cam mechanism in the closure automatically transitions from the down-position to the up-position when the down-force is applied, eliminating the need for the user to manually coordinate two opposing movements. The mechanism serves itself by using the first movement to trigger the release for the second movement.
3Ease of operation
If the closure is removed to access contents, then ease of operation is improved, but accidental dispensing and spillage increases
Solution Approach 1:
The valve assembly is pre-configured to be closed when the closure is removed, and the conduit is pre-positioned to block the aperture. The user must deliberately perform the action of pulling the valve assembly to open it, ensuring that mere removal of the closure does not result in accidental dispensing.
Solution Approach 2:
The valve assembly serves as an intermediary barrier between the closure and the liquid contents. It provides a secondary safety mechanism that remains in place even when the closure is removed, preventing accidental dispensing while still allowing intentional access when needed.
4Object-affected harmful factors
If a valve assembly requiring relative movement between reservoir and outlet is used, then accidental dispensing is reduced, but device complexity increases
Solution Approach 1:
The valve assembly is merged with the closure as a single integrated unit that moves together. The conduit is formed as part of the valve assembly structure, and the aperture positioning is achieved through the combined movement of these integrated components, reducing the need for separate complex mechanisms.
Solution Approach 2:
The valve assembly performs multiple functions: it acts as a flow control valve, a safety mechanism, and a structural component connecting the closure to the reservoir. The conduit serves both as a liquid passage and as a mechanical element that positions the aperture relative to the reservoir opening.
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 design significantly reduces accidental dispensing and spillage by requiring deliberate actions to access the contents, enhancing safety for both children and individuals with weak hand strength, thereby minimizing poisoning risks.
Implementation Method 1
the valve assembly and conduit are biased to the closed position
Implementation Method 2
the conduit is disposed such that the wall occludes the second aperture
Data Source
Figure 1(a)~1(c)
Figure 2
Figure 3(a)~4(c)
AI summary
A dispenser (1) for dispensing a liquid is disclosed. The dispenser (1) comprises an outlet (5) for dispensing a liquid, a reservoir (2) for liquid, and a closure (3) configured to engage with the dispenser (1) and movable between a closed position in which the outlet (5) is enclosed and an open position in which the outlet (5) is not enclosed. The dispenser (1) further comprises an arrangement (4) for controlling liquid communication between the reservoir (2) and the outlet (5), the arrangement (4) and reservoir (2) movable with respect to each other between a first configuration in which the reservoir (2) is not in liquid communication with the outlet (5) and a second configuration in which the reservoir (2) is in liquid communication with the outlet (5). By requiring a second movement after removal of the closure accidental access or dispensing of the contents may be avoided or reduced.