Closure with Frangible Blocking Member for Leak Prevention
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Solution Overview
Problem
Conventional dispensing closures for fluent substances are prone to inadvertent opening during shipping and handling, leading to premature leakage, and existing solutions like adhesive seals or strengthened latching mechanisms either increase costs or pose user difficulties.
Innovation Solution
A closure design featuring a separately formed shell with a frangibly connected blocking member that prevents accidental actuator rotation until intentionally broken by the user, combined with a rotatable actuator for controlled dispensing, allowing easy assembly and customization while minimizing leakage risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive seals or film wraps are applied to prevent inadvertent opening, then reliability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The closure is divided into separate components: a closure body with an actuator and a shell with a blocking member. This segmentation allows the blocking member to be a distinct element that can be frangibly connected, providing security without requiring additional seals or wraps. The separate components can be manufactured independently and assembled together, maintaining simplicity while improving reliability.
Solution Approach 2:
The blocking member acts as an intermediary element between the actuator and the environment. It frangibly connects to the shell and physically blocks the actuator from rotating inadvertently. This intermediary provides the security function without adding complex sealing mechanisms, as it directly prevents actuator movement through its blocking position.
2Reliability
If latching mechanisms are strengthened to prevent accidental opening, then reliability is improved, but ease of operation deteriorates
Solution Approach 1:
The blocking member is designed with frangible connections that have specific mechanical properties - strong enough to prevent accidental opening during normal handling, but weak enough to break when sufficient force is applied by a user. This parameter change allows the same structure to provide both security and ease of operation. The frangible connections can be engineered with controlled strength characteristics that satisfy both requirements.
Solution Approach 2:
The blocking member is pre-positioned in a blocking configuration that prevents actuator rotation before use. This preliminary action provides security during shipping and storage. When the user needs to open the closure, they simply apply force to break the frangible connections, which then allows the actuator to rotate freely. The preliminary blocking action is automatically removed by the user's opening action.
3Reliability
If a blocking member is added to prevent inadvertent opening, then reliability is improved, but device complexity increases
Solution Approach 1:
The blocking member is integrated with the shell as a frangibly connected component rather than being a completely separate element. This merging reduces the number of distinct parts and simplifies the overall structure. The blocking member can be formed as part of the shell molding process or easily attached to it, combining the security function with the existing shell structure without adding significant complexity.
Data Source
AI summary
A closure (40, 240) for a fluent substance-containing system, such as a container, includes a body (54, 254) for receiving the fluent substance from the system, an actuator (60, 260) assembled with the closure body (54, 254) for selectively preventing or permitting flow of the fluent substance through the closure body (54, 254), and a shell (56, 256) that is mounted around at least a portion of the closure body (54, 254). The shell (56, 256) has a top end (156) and a blocking member (176) having an initial configuration and a separated configuration. In the initial configuration, the blocking member (176) is connected to the top end (156) to prevent the actuator (60, 260) from moving into an open, dispensing position. In the separated configuration, the blocking member (176) is at least partially separated from the top end (156) to allow the actuator (60, 260) to move into the open, dispensing position.