Snap-On Faucet Handle Assembly With Tapered Stem Retention
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Solution Overview
Problem
Conventional faucet handle assemblies using threaded fasteners often result in increased assembly time and scrap due to cross-threading issues, and they do not allow for a low-profile handle attachment below the bonnet cap.
Innovation Solution
A handle assembly that couples to a faucet valve cartridge using a tapered valve stem and a wire form retainer, where the tapered valve stem is received within a receiving chamber defined by a vertically tapered side wall, allowing for easy assembly and disassembly with minimal tools and reduced scrap, and enabling a lower profile handle attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If threaded fasteners (set screws) are used to couple the handle to the valve stem, then the handle can be securely attached, but assembly time increases and scrap due to cross-threading occurs
Solution Approach 1:
The patent removes the threaded fastener (set screw) from the coupling mechanism entirely. Instead, the handle is directly coupled to the valve stem through a tapered interference fit where the handle's internal tapered surface engages with the external tapered surface of the valve stem, eliminating the need for separate fastening components and their associated assembly issues.
Solution Approach 2:
The patent changes the coupling parameter from threaded engagement to tapered friction fit. The tapered surfaces create a mechanical interference fit that provides secure attachment through friction and geometric locking, rather than through thread engagement. This parameter change eliminates cross-threading risks and reduces assembly complexity.
2Reliability
If threaded fasteners are used to couple the handle to the valve stem, then the handle can be securely attached, but scrap due to cross-threading increases
Solution Approach 1:
The patent removes the threaded fastener (set screw) from the coupling mechanism entirely. Instead, the handle is directly coupled to the valve stem through a tapered interference fit where the handle's internal tapered surface engages with the external tapered surface of the valve stem, eliminating the need for separate fastening components and their associated assembly issues.
Solution Approach 2:
The patent changes the coupling parameter from threaded engagement to tapered friction fit. The tapered surfaces create a mechanical interference fit that provides secure attachment through friction and geometric locking, rather than through thread engagement. This parameter change eliminates cross-threading risks and reduces assembly complexity.
3Length of moving object
If conventional threaded fasteners are used, then the handle can be attached, but the handle profile cannot be reduced below the bonnet cap
Solution Approach 1:
The patent moves the attachment interface from a lateral position (requiring access from the side where the bonnet cap would interfere) to an axial position along the valve stem. The tapered coupling occurs along the length of the valve stem, allowing the handle to be positioned lower without interfering with bonnet cap installation or removal operations.
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 reduces assembly time and scrap by providing a secure and efficient coupling mechanism that minimizes cross-threading issues, while allowing for a lower profile handle attachment that does not require access during assembly or removal.
Implementation Method 1
A tapered valve stem includes a retaining recess. The tapered valve stem is received within the receiving chamber of the receiver so that at least a portion of the wire form retainer extends through the slot of the receiver and is received within the retaining recess of the tapered valve stem.
Data Source
AI summary
A handle assembly for a faucet includes a receiver defined by a handle body and having a vertically tapered side wall defining a receiving chamber, a slot extending through the tapered side wall into the receiving chamber, and a wire form retainer coupled around the receiver and being at least partially disposed within the slot for extending into the receiving chamber. A tapered valve stem includes a retaining recess, and wherein the tapered valve stem is received within the receiving chamber of the receiver so that at least a portion of the wire form retainer extends through the slot of the receiver and is received within the retaining recess of the tapered valve stem.