Expandable Garden Hose Dynamics and Kink Resistance
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Solution Overview
Problem
Conventional garden hoses are cumbersome and difficult to store due to their non-expandable and non-contractible nature, often leading to kinking and entanglement issues, especially in spaces where storage devices are impractical.
Innovation Solution
A flexible garden hose with an elastic inner tube member and a soft fabric outer tube member that expands longitudinally and laterally upon pressurized water introduction, using a flow restrictor to control water pressure, and automatically contracts when pressure is released, featuring a tool-free plastic coupling for assembly and repair.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional garden hoses are made with thick sidewalls to prevent kinking, then kink resistance is improved, but weight increases making the hose heavy and cumbersome
Solution Approach 1:
The hose transitions from a static structure to a dynamic one that automatically changes its configuration based on water pressure. When water flows through the hose, it expands to its full operational length and diameter, providing kink resistance. When water pressure is removed, it automatically contracts to a compact size, eliminating the need for thick sidewalls and reducing weight.
Solution Approach 2:
The hose utilizes changes in physical parameters (length, diameter, volume) in response to water pressure. The expandable hose increases its length and diameter when pressurized, providing the necessary structural integrity to prevent kinking, and returns to its contracted state when depressurized, reducing weight and improving portability.
2Stability of the object's composition
If garden hoses are made non-expandable and non-contractible, then structural stability is maintained, but storage becomes difficult and cumbersome
Solution Approach 1:
The hose is designed to dynamically change its physical state between expanded and contracted configurations. During use, water pressure maintains the hose in an expanded stable state for optimal performance. During storage, the hose automatically contracts to a compact stable state, eliminating the need for special storage devices and making it easy to store in small spaces.
Solution Approach 2:
The hose performs its own storage function by automatically contracting when water pressure is removed. This self-service mechanism eliminates the need for external storage devices, reels, or containers, allowing the user to simply coil and store the hose in any convenient location without additional equipment.
3Volume of moving object
If garden hoses are made expandable and contractible, then storage space is reduced and handling is improved, but complexity of the hose structure increases
Solution Approach 1:
The hose is divided into multiple layers with distinct functions: an inner tube for water flow, an intermediate layer with expandable elements (such as foam or air cells) that provide the expansion mechanism, and an outer protective cover. This segmentation allows each layer to perform its specific function while working together to achieve the overall expandable-contractible behavior.
Solution Approach 2:
The hose utilizes composite construction combining different materials with complementary properties. The inner tube uses flexible rubber or plastic for water flow, the intermediate layer uses expandable foam or air-filled cells for the expansion mechanism, and the outer cover uses durable fabric or rubber for protection. This composite approach achieves the desired functionality while managing structural complexity.
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 hose provides a lightweight, kink-resistant, and space-efficient solution that automatically expands and contracts, reducing storage issues and weight, while allowing easy handling and storage without the need for additional storage devices.
Implementation Method 1
an inner tube member formed from a material that is elastic and capable of expanding two to six times its unexpanded length
Implementation Method 2
a flow restrictor juxtapositioned to an outlet of the hose
Data Source
AI summary
A flexible garden hose having an inner tube member made from elastic material and an outer tube member made from a non-elastic material. The inner tube member is secured to the outer tube member only at an inlet coupler and an outlet coupler. The inlet coupler is constructed to secure to a water supply provided from a conventional household water spigot. The outlet coupler is coupled to a flow restrictor allowing the inner tube member to equalize in pressure with pressurized water received from the water supply. Pressurized water expands the elongated inner tube member longitudinally along a length of the inner tube member and laterally across a width of the inner tube member thereby substantially increasing the length of the hose to an expanded condition wherein the hose contracts to a substantially decreased length when there is a decrease in pressurized water.