Spill-Proof Spout With Pressure-Sealed Slit Valve
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Solution Overview
Problem
Existing spill-proof cup designs either require deliberate action to seal or open, are inefficient with carbonated or hot beverages, or have separable components that complicate cleaning and are prone to damage from biting.
Innovation Solution
A spout with a flexible, one-piece design featuring integrally formed flanks that create a self-locking valve when pressure is applied, allowing easy opening with minimal suction and resistant to damage from biting, using a slit that opens by altering the inclination of the flanks when squeezed at right angles to the slit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure operated valve is used to automatically open in response to reduced pressure, then spillage is prevented, but the valve cannot distinguish between high pressure within the container and low pressure in the spout, leading to inefficient leak blocking or excessive resistance to suction
Solution Approach 1:
The valve is segmented into two distinct functional components: a demand valve portion with a flexible membrane that responds to suction pressure, and a sealing portion with a resilient member that responds to internal container pressure. This segmentation allows each component to specialize in one pressure response, resolving the contradiction by enabling both efficient leak blocking and low suction resistance.
Solution Approach 2:
The invention inverts the traditional pressure valve logic by using a demand valve that opens with minimal suction rather than requiring high suction to overcome a seal. The sealing function is inverted to use a resilient member that actively seals under internal pressure rather than passive blocking, allowing the system to respond differently to opposite pressure conditions.
2Ease of operation
If a self-sealing demand valve with separable components is used to allow opening with very low suction, then spillage is prevented, but the components need to be dismantled for cleaning and are prone to damage from biting
Solution Approach 1:
The invention merges the demand valve portion and sealing portion into a single integrated valve assembly that is permanently fitted to the spout. The flexible membrane and resilient member are positioned and secured within a single molded structure, eliminating the need for separable components while maintaining the low suction opening capability. This merging resolves the contradiction by reducing component count and eliminating disassembly needs.
Solution Approach 2:
The demand valve uses a flexible membrane made of elastomeric material that forms a thin, resilient sealing surface. This flexible film approach allows the valve to open with minimal suction force while maintaining structural integrity when integrated into the one-piece cap, resolving the contradiction between ease of operation and device complexity.
3Strength
If a one-piece cap with resilient molding is used to resist biting damage, then durability is improved, but the cup leaks when shaken or filled with hot or carbonated liquid
Solution Approach 1:
The invention introduces dynamic pressure-responsive elements (flexible membrane and resilient member) into the one-piece cap structure. These dynamic components automatically adjust the valve state based on internal pressure conditions: remaining closed during normal use to prevent leaks, but opening when internal pressure forces the membrane against the sealing surface. This dynamics approach resolves the contradiction between structural durability and spill prevention under various conditions.
Solution Approach 2:
The valve mechanism changes its operational parameters based on internal pressure: at normal pressure the resilient member maintains a sealed position, but when internal pressure increases (from shaking, heating, or carbonation), the pressure differential causes the flexible membrane to deform and press the sealing surface against the resilient member, opening the valve to equalize pressure and prevent leakage.
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 spout effectively prevents spillage under various conditions, including inversion and pressure changes, while being easy to use and maintain, with a design that reduces the risk of damage and improves user instinctive operation.
Implementation Method 1
the side wall being made of a flexible material... deformation of the side wall of the spout when the spout is held between the lips of a drinker acts to open the slit
Implementation Method 2
at least the front portions of the flanks are inclined away from the mouth of the spout such that pressure within the container acts to urge the flanks against one another so as to maintain the slit closed
Data Source
AI summary
A spout for a spill-proof beverage container has a side wall defining an outer surface and an inner surface defining a discharge passage. A valve in the discharge passage includes two flanks formed integrally with the side wall and projecting from opposite sides of the inner surface of the spout. The front end faces of the flanks mate with one another along a slit that extends generally parallel to the longer axis of the spout. At least the front portions of the flanks are inclined away from the mouth of the spout such that pressure within the container acts to urge the flanks against one another so as to maintain the slit closed. Deformation of the side wall when the spout is held between the lips of a drinker acts to open the slit and create an opening between the flanks to allow the beverage to be discharged.