Cartridge Valve Stem Assembly for Adjustable Faucet Handle Torque
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Solution Overview
Problem
Existing faucet valve technologies lack the ability to provide tailored torque and frictional resistance, limiting the design flexibility of faucet handles in terms of size, shape, and weight, which restricts aesthetic and operational improvements.
Innovation Solution
The development of a cartridge valve assembly with a stem adapter and stem assembly that includes a spherical portion capable of expanding in size to increase frictional resistance, and a plug assembly with adjustable screws to enhance torque, allowing for tailored torque and improved handle operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing faucet valve technologies are used, then the valve structure is simple, but the torque and frictional resistance cannot be tailored, limiting handle design flexibility
Solution Approach 1:
The stem assembly is divided into multiple components including a stem, spherical portion, and plug assembly that can be independently adjusted. This segmentation allows each component to contribute differently to the overall torque and frictional resistance, enabling tailored performance without requiring a completely redesigned valve system.
Solution Approach 2:
The spherical portion is designed to expand in size in response to insertion of the plug assembly, dynamically changing the frictional resistance. This dynamic adjustment mechanism allows the valve to adapt its characteristics based on operational requirements, providing tailored torque without fixed complex structures.
2Ease of operation
If the spherical portion expands in size to increase frictional resistance, then torsional friction and handle operation are improved, but the valve assembly becomes more complex
Solution Approach 1:
The frictional resistance is adjusted by changing the physical parameter of the spherical portion's size. When the plug assembly is inserted, it causes the spherical portion to expand, thereby increasing the frictional resistance and improving handle operation smoothness through a simple parameter change rather than complex mechanical adjustments.
Solution Approach 2:
The plug assembly acts as an intermediary element that mediates between the user's rotational input and the valve's internal mechanics. By inserting the plug assembly, the user indirectly controls the expansion of the spherical portion and the resulting frictional resistance, simplifying the operational interface while achieving precise control.
3Force
If adjustable screws are added to compress the plug against the stem assembly, then torque can be enhanced, but manufacturing complexity increases
Solution Approach 1:
The adjustable screws are pre-positioned and pre-threaded into the stem adapter during manufacturing, with the plug assembly already in place. This preliminary action allows the torque adjustment mechanism to be built-in during assembly rather than requiring complex post-manufacturing calibration, simplifying the manufacturing process while maintaining adjustable torque capabilities.
Solution Approach 2:
The compression force is applied locally at specific points where the plug assembly contacts the stem assembly, rather than requiring uniform force distribution throughout the entire valve. This localized application of force through the adjustable screws allows for precise torque control without requiring complex manufacturing processes.
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 solution enables faucet handles to be designed with greater flexibility in size and shape, providing improved torsional friction, smoothness, and comfort, while supporting longer and heavier handles, and allowing for easier retrofitting into existing systems.
Implementation Method 1
The spherical portion is configured to expand in size (e.g., diametrically) in response to the first end inserting a portion of the body of the second stem component into the opening in the first stem component
Implementation Method 2
a screw configured to be threaded in the bore and configured to compress the plug against the stem assembly in response to tightening the screw to increase a normal force between the plug and the stem assembly
Implementation Method 3
The spherical portion is configured to expand in size (e.g., diametrically) in response to the first end inserting a portion of the body of the second stem component into the opening in the first stem component, which increases a frictional resistance induced by relative rotation between the stem assembly and the stem adapter
Data Source
AI summary
A cartridge valve includes a housing, a stem adapter, and a stem assembly. The stem adapter includes a body defining a first hole, which extends in a longitudinal direction. The stem assembly includes a first stem component and a second stem component. The first stem component includes an arm and a spherical portion that is configured to be at least partially positioned within the first hole and defines an opening. The second stem component has a body that is configured to be at least partially received within the opening of the first stem component. The spherical portion is configured to expand in size in response to the first end inserting a portion of the body of the second stem component into the opening in the first stem component, which increases a frictional resistance induced by relative rotation between the stem assembly and the stem adapter.