Sippy cup
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Solution Overview
Problem
Existing sippy cups face challenges in preventing liquid spills and leaks, particularly due to inadequate air pressure equalization and sealing mechanisms, which can lead to accidental discharge when the cover is closed or opened.
Innovation Solution
The sippy cup employs an elastic straw-vent assembly with a flexible tubular straw and a separate air passageway that includes a vent opening, which seals when the cover is closed and opens to equalize pressure before the straw fluid passageway, using thin elastic membranes to prevent leakage, and a pull tab for easy removal and cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cover is closed to seal the sippy cup, then liquid leakage is prevented, but air pressure equalization is blocked causing accidental discharge
Solution Approach 1:
The sealing system is segmented into two independent pathways: a fluid passageway through the straw and a separate air passageway through the elastic body. This allows the cover to seal the liquid path while maintaining a separate channel for air pressure equalization, preventing pressure buildup without compromising sealing performance.
Solution Approach 2:
The elastic body acts as an intermediary element that provides both sealing and pressure equalization functions. It forms a seal around the straw while containing a separate air passageway that allows air to flow independently from liquid, mediating between the sealing requirement and pressure equalization need.
2Object-generated harmful factors
If a vent mechanism is added to equalize air pressure, then accidental discharge is prevented, but liquid leakage may occur
Solution Approach 1:
The vent mechanism is segmented from the liquid path by creating a separate air passageway through the elastic body that is independent of the straw's fluid passageway. This segmentation ensures that air can flow for pressure equalization without compromising the liquid seal.
Solution Approach 2:
Different regions of the elastic body have different functions: one region seals around the straw to prevent liquid leakage, while another region contains the air passageway for pressure equalization. This local differentiation of quality allows simultaneous achievement of sealing and venting functions.
3Reliability
If the straw is pinched closed to prevent discharge, then liquid leakage is prevented, but air pressure equalization is blocked
Solution Approach 1:
The straw and vent assembly are merged into a single integrated component where the elastic body simultaneously provides the straw structure, the sealing surface, and the air passageway. This merging reduces overall device complexity while maintaining the dual passageway functionality.
Solution Approach 2:
The elastic body serves multiple functions: it forms the straw structure, provides sealing contact with the cover, and contains the air passageway. This multi-functionality reduces the number of separate components needed, simplifying the overall device while achieving both sealing and pressure equalization.
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
This design effectively prevents spills and leaks by ensuring secure sealing when closed and allowing free drinking when open, while also equalizing air pressure to prevent accidental discharge, even when the cup is inverted or exposed to temperature changes.
Implementation Method 1
thin elastic membranes to prevent leakage
Implementation Method 2
the slit in the vent membrane opens at a pressure relative to the opening pressure of the straw membrane vent so that a buildup of pressure inside of the cup will not cause liquid to be discharged from the straw
Implementation Method 3
the vent opens, equalizing the pressure in the cup and the atmosphere, before the straw fluid passageway is opened
Implementation Method 4
An elastic straw-vent assembly is provided which has an elastic body which sealingly engages the inlet-outlet opening formed in the lid
Data Source
AI summary
A drinking vessel having a cup with a removable lid having an inlet-outlet opening which receives an elastic straw-vent assembly having a flexible tubular straw and an air passageway forming a vent opening. A cover movably mounted on top of the lid, shiftable between a closed and an open position, with an inward surface of the cover forming fluid tight seal with the vent opening when the cover is in the closed position. In the closed position the cover engages the straw, folding the straw against the lid to seal the straw passageway, and in the open position, the straw fluid passageway and the vent opening are unobstructed by the cover. A removeable elastic straw-vent assembly is also disclosed having a tab to be grasped by the user for easy removal for cleaning.