Sprayhead retraction assembly with constant-force spring
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Solution Overview
Problem
Conventional faucet sprayhead retraction mechanisms, such as counterweights and springs, either fail to provide a consistent retraction force or increase in resistance as the hose is withdrawn, leading to undesirable operation and potential disturbance of items stored beneath the sink.
Innovation Solution
A sprayhead retraction assembly utilizing a constant-force spring coiled around a pulley, which applies a consistent force to retract the sprayhead into the spout while minimizing hose movement and maintaining contact with the surface, preventing disturbance of items stored beneath the sink.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a counterweight is used to provide retraction force, then the sprayhead can be retracted toward the spout, but the hose disturbs items stored beneath the sink
Solution Approach 1:
A constant-force spring is introduced as an intermediary mechanism between the hose and the counterweight system. The spring coils around a pulley and provides a controlled, constant retraction force that minimizes hose movement and prevents disturbance of stored items beneath the sink, while still achieving sprayhead retraction.
Solution Approach 2:
The patent changes the force delivery parameter from a constant counterweight force to a controlled constant-force spring mechanism. The spring is configured to provide a consistent retraction force throughout the hose's movement range, preventing excessive hose movement that would disturb stored items.
2Force
If a spring is used to bias the sprayhead toward the spout, then retraction force is provided, but resistance increases as the hose is withdrawn
Solution Approach 1:
The patent employs a constant-force spring that maintains a consistent force parameter throughout the hose's withdrawal and retraction cycle. This eliminates the increasing resistance characteristic of conventional springs, providing smooth and predictable operation from start to finish.
Solution Approach 2:
The constant-force spring delivers force in a consistent, periodic manner throughout the hose's movement range, ensuring uniform resistance characteristics and smooth operation during both extension and retraction phases.
3Reliability
If conventional spring mechanisms are used, then the sprayhead can be biased toward the spout, but the resistance increases as the hose is withdrawn
Solution Approach 1:
The patent transforms the force parameter from an increasing function (conventional springs) to a constant function (constant-force spring). This ensures reliable, predictable retraction force while maintaining low, consistent resistance throughout the hose's movement range.
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 constant-force spring mechanism ensures a consistent and controlled retraction of the sprayhead, providing a constant tactile response and minimizing hose movement, thus maintaining stability and usability without disturbing stored items.
Implementation Method 1
a constant-force spring defining a first end and a second end, wherein the first end is coupled to the second pulley, such that the constant-force spring is configured to coil around the second pulley
Implementation Method 2
a third pulley configured to redirect the hose between an outlet end of the hose and the first pulley
Data Source
AI summary
A sprayhead retraction assembly includes a hose coupled at a first end to a faucet sprayhead and at a second end to a water source. The assembly further includes a first member having a first portion that is engaged with the hose between the first and second ends of the hose. The assembly further includes a constant-force spring coupled at a first end to a second portion of the first member and coupled at a second end to a fixed surface.