Child-Resistant Safety Closure with Rotating Actuator
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing child-resistant closures for dispensing containers are inadequate as they can be easily bypassed, provide limited protection for multiple-dose products, and are not easily adaptable to pump and aerosol dispensers, posing risks for accidental access by children or individuals with limited strength or mobility, and lack effective color coding for visually impaired users.
Innovation Solution
A safety closure system with a rotating actuator and arched segment push button mechanism that requires two independent motions to unlock, allowing for optimized material selection and color coding of components, enhancing the locking mechanism's effectiveness and usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a threaded cap is used to prevent removal, then child resistance is improved, but the safety function can be easily overcome by forcing the cap to turn
Solution Approach 1:
The closure system is divided into multiple functional components: a pump actuator assembly, a rotation locking member with push-button, and a cap body with locking features. This segmentation allows each component to perform its specific function - the pump actuator controls dispensing, the rotation locking member provides child-resistant locking, and the cap body houses the mechanism. The separation of these functions prevents simple forcing from bypassing the safety mechanism.
Solution Approach 2:
The rotation locking member is designed to rotate between locked and unlocked positions, requiring a specific dynamic action (pushing the button while rotating) to disengage. This dynamic locking mechanism, combined with the pump actuator's vertical motion requirement, creates a multi-step operation that cannot be bypassed by simple forcing, thereby maintaining reliability while enabling legitimate access.
2Reliability
If a one-time locking apparatus is used, then initial child resistance is improved, but protection is lost for subsequent accesses
Solution Approach 1:
The rotation locking member is designed to engage and disengage periodically - it locks in the initial state, can be unlocked by the button-push-and-rotate action, and can be re-engaged by rotating the pump actuator. This periodic locking and unlocking capability maintains child resistance for multiple doses while allowing legitimate repeated access, extending the duration of protection beyond a single use.
3Device complexity
If the rotation locking member is integrated into the pump actuator, then device complexity is reduced, but the locking member becomes vulnerable to damage and detachment
Solution Approach 1:
The rotation locking member and pump actuator are merged into a single integrated assembly where the locking member is positioned within the pump actuator housing. This merging reduces the number of separate components and simplifies the overall structure. The integration ensures that the locking member remains securely positioned during operation while maintaining its rotational locking function, preventing detachment while reducing complexity.
4Ease of manufacture
If uniform construction is used for pump actuator and rotation locking member, then manufacturing is simplified, but material selection cannot be optimized for each feature
Solution Approach 1:
The pump actuator assembly uses different materials for different components based on their specific functional requirements. The pump actuator body may use a rigid material for structural support, while the rotation locking member uses a material with appropriate friction characteristics for reliable engagement and disengagement. This local quality optimization allows each component to be made from the most suitable material for its function, improving reliability while the integrated design keeps manufacturing feasible.
5Ease of manufacture
If the rotation locking member is made with same color material, then manufacturing is simplified, but visually impaired individuals cannot easily locate it
Solution Approach 1:
The rotation locking member's push-button is made with a color different from the pump actuator body, creating a visual contrast that helps visually impaired individuals locate and identify the button. This color differentiation maintains ease of manufacture through simple multi-color molding while dramatically improving visual accessibility. The contrasting color serves as a visual cue for the functional element that requires user interaction.
Data Source
AI summary
A security cap includes a cap body having a base portion and an upstanding wall extending longitudinally upward from a top edge thereof. An actuator is assembled within an interior of the upstanding wall, the actuator being longitudinally movably and axially rotatable enabling cycling between a locked state and an unlocked state. The actuator is rotationally governed by a rotation locking member comprising a push button and an arched biasing member. The push button extends through an aperture provided in the actuator and engages with a vertical edge integrated along a recess formed within the upstanding wall. Vertical motion is governed by a projecting locking feature extending from the actuator. The locking feature engages with a actuation governing edge in a locked state and rotates free of the governing edge into an unlocked, dispensing state, enabling vertical motion of the actuator for dispensing contents from with the container.