Single Lever Faucet Hot Water Auto Shut-Off Mechanism
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Solution Overview
Problem
Current faucet designs requiring automatic shut-off of hot water flow necessitate two separate valves and handles, increasing costs and maintenance due to additional components and complexity.
Innovation Solution
A single lever faucet design incorporating a valve body with a rotatable stem and a lever assembly that uses a biasing device, such as a torsion spring, to automatically shut off hot water flow when the lever is released, eliminating the need for separate hot and cold water valves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two separate valves and handles are used to provide automatic shut-off of hot water flow, then automatic shut-off functionality is achieved, but device complexity and cost increase
Solution Approach 1:
The patent combines two separate valve functions (cold water control and hot water control with automatic shut-off) into a single integrated valve body. The single lever assembly controls both hot and cold water flows simultaneously, eliminating the need for separate handles and reducing component count while maintaining automatic shut-off capability through an internally mounted spring mechanism
Solution Approach 2:
The single lever assembly serves multiple functions: it controls cold water flow, controls hot water flow, and triggers automatic shut-off of hot water when released. The valve body integrates multiple valve seats and flow paths within a single structure, allowing one component to perform what previously required two separate valve assemblies
2Reliability
If two separate valves and handles are used, then automatic shut-off is provided, but maintenance requirements and costs increase
Solution Approach 1:
By merging the hot water valve and cold water valve into a single integrated assembly, the patent reduces the number of separate components that require maintenance. The single lever assembly with integrated spring mechanism eliminates the need to service two separate valve bodies, handles, and mounting structures, thereby simplifying repair procedures and reducing maintenance costs
3Device complexity
If a single lever system is used without biasing device, then device complexity is reduced, but automatic shut-off of hot water flow cannot be achieved
Solution Approach 1:
The spring-loaded lever assembly is designed to automatically return to the closed position without external intervention. When the user releases the lever, the biased spring mechanism self-activates to shut off hot water flow, eliminating the need for additional actuators, motors, or control systems while maintaining automatic shut-off functionality
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 reduces costs and maintenance by integrating automatic shut-off functionality into a single lever system, allowing for unimpeded cold water flow and automatic return to the closed position when hot water flow is not in use, thus minimizing water loss when unattended.
Implementation Method 1
A compression spring is positioned within the lever handle surrounding the portion of the lever pin in the handle and operating to bias the lever handle away from the lever base
Implementation Method 2
A torsion spring has a first post disposed in the elongated slot and a second post disposed in an aperture of the lever assembly. The elongated slot allows displacement of the first post within the slot during rotation in the first direction preventing an increase in a spring force of the torsion spring. The first post is in contact with a first end wall of the elongated slot during rotation in the second direction such that the spring force is continuously increased as the lever assembly is rotated toward the second direction
Data Source
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AI summary
A faucet includes a valve body having a cartridge receiving bore. A valve cartridge is sealingly disposed in the bore. The valve cartridge includes a rotatable stem. An arc-shaped slot is created in the valve cartridge. A lever assembly having a single handle is connected to the stem and operates when rotated in a first direction to permit cold water flow through the valve body, and after being depressed can be rotated in an opposite second direction to permit hot water flow through the valve body. A torsion spring has a first post received in the elongated slot translatable between opposed ends of the elongated slot, and a second post received in a lever assembly aperture preventing second post translation. A biasing force of the torsion spring biases the lever assembly toward a valve closed position only when the lever assembly is rotated in the second direction.