Pump Cap Press-Fit Assembly for Easy Double-Container Refills
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Solution Overview
Problem
Existing double containers face inconvenience in refilling due to screw-coupling of the pump cap, require additional sealing materials causing environmental pollution, and the removal of sealing papers is cumbersome.
Innovation Solution
A pump cap design that uses a press-fit mechanism for the inner container, featuring a guide bushing, coupling sleeve, cap flange, and shoulder brim, with a pricker to pierce the sealing part for easy refilling and sealing removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inner container is coupled to the pump cap in a screw-coupling manner, then the connection is secure and reliable, but the replacement process becomes inconvenient and time-consuming
Solution Approach 1:
The pump cap is divided into multiple functional components: a guide bushing that fits into the inner container's neck, a coupling sleeve that provides the connection interface, and a cap flange that seals against the outer container. This segmentation allows the inner container to be quickly removed and replaced by simply detaching from the guide bushing, while the pump cap remains attached to the outer container, thus improving replacement convenience while maintaining connection reliability through the specialized components.
2Reliability
If additional sealing paper or inner container lid is used to seal the inner refill container, then the sealing function is achieved, but environmental pollution increases due to additional waste materials
Solution Approach 1:
The sealing function is merged into the pump cap assembly itself through the cap flange that seals against the outer container's rim. The guide bushing and coupling sleeve are integrated into this sealing structure, eliminating the need for separate sealing papers or lids. This integration maintains effective sealing while reducing waste materials, as the pump cap components are reusable and do not require additional disposable sealing elements.
3Reliability
If the sealing paper is designed to be removed by grasping with fingertips or using a tool, then the sealing can be removed, but the process becomes inconvenient and time-consuming
Solution Approach 1:
The pump cap assembly is designed to be self-securing through the guide bushing that fits into the inner container's neck and the coupling sleeve that connects to the outer container. When the inner container is removed, the sealing function is automatically maintained by the cap flange sealing against the outer container rim. The design eliminates the need for manual removal operations, as the sealing is automatically preserved through the structural arrangement of components, improving ease of operation while maintaining sealing integrity.
Data Source
AI summary
The present invention relates to a pump cap for a double container, which can improve the convenience of replacement when refilling an inner container by combining a pump cap with a general inner container. The present invention provides, as its technical idea, a pump cap for a double container, which includes an outer container having an outer neck part, an inner container accommodated inside the outer container through the outer neck part of the outer container and having an inner neck part, a pump cap detachably fitted into the inner neck part of the inner container, a discharge pump coupled to the pump cap and having a piston housing for discharging liquid contents stored in the inner container, and a container cap for fixing the discharge pump and the inner container to the outer container, characterized in that the pump cap includes a guide bushing detachably fitted into inner circumference of the inner neck part of the inner container so as to guide coupling of the piston housing, a coupling sleeve spaced apart from outer diameter of the guide bushing at a predetermined interval so as to be detachably coupled to outer circumference of the inner neck part of the inner container, a cap flange for connecting the coupling sleeve and an upper end of the guide bushing, and a shoulder brim extending along periphery of the cap flange so as to be placed on an upper end of the outer neck part of the outer container.