Rotary Cam Valve Control for Low-Force Ablutionary Fittings
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Solution Overview
Problem
Existing fluid control devices for ablutionary fittings require significant force to operate valves, limiting design flexibility and usability for less strong or less dextrous users, as they often rely on mechanical actuators that must overcome water pressure.
Innovation Solution
A rotary control member with a cam surface that drives a linear operating member to actuate a valve actuator, allowing for low-force operation by rotating the control member, which can select between open and closed valve positions with minimal rotation, and includes a separate valve actuator and operating member moving in the same direction, assisted by a support frame and biased by resilient members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a mechanical actuator is used to operate the valve, then the valve can be actuated, but significant force is required to overcome water pressure
Solution Approach 1:
The patent replaces the traditional mechanical actuator system with a cam mechanism that converts rotational motion into linear motion. The cam surface profile is designed to provide mechanical advantage, allowing the user to operate the valve with significantly reduced force by rotating the control member rather than directly pushing against the valve stem.
Solution Approach 2:
The cam surface is designed with a specific curved profile that creates varying leverage throughout the rotation cycle. The curvature of the cam surface allows the operating member to follow an optimized path, maximizing mechanical advantage at critical points in the valve operation cycle and minimizing the force required by the user.
2Adaptability or versatility
If a traditional mechanical actuator is used, then valve control is achieved, but design freedom for positioning control member is limited
Solution Approach 1:
The valve actuation system is segmented into distinct functional components: the control member for user interaction, the cam mechanism for motion conversion, the operating member for force transmission, and the valve actuator for final valve control. This segmentation allows each component to be independently optimized and positioned for ergonomic and functional requirements.
Solution Approach 2:
The cam mechanism introduces dynamic motion conversion, transforming the user's rotational input into the linear motion required by the valve. This dynamic approach provides greater design flexibility in positioning the control member away from the valve body, allowing for ergonomic hand shower configurations and various mounting arrangements.
3Ease of operation
If less rotation is required to switch valve positions, then user operation is simplified, but precise control becomes more difficult
Solution Approach 1:
The cam mechanism is designed with periodic features that create distinct phases in the rotation cycle: an initial phase for valve opening, a middle phase for flow regulation, and a final phase for valve closing. This periodic action allows the user to achieve full valve switching with limited rotation while maintaining precise control through the structured progression of cam lobes and valleys.
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
Enables users to control valve operation with reduced force and smaller rotations, benefiting less strong or dexterous individuals, while maintaining efficient fluid flow management through the use of a diaphragm valve that leverages water flow to open the valve, ensuring fluid passage or blockage.
Implementation Method 1
a rotary control member comprising a cam surface; wherein, in use, the rotary control member is rotatable such that the cam surface drives the first operating member in a linear direction
Implementation Method 2
biased by resilient members
Data Source
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AI summary
A fluid control device for an ablutionary fitting comprising: a rotary control member comprising a cam surface; a first valve comprising a valve member; a first valve actuator; and a first operating member; wherein, in use, the rotary control member is rotatable such that the cam surface drives the first operating member in a linear direction and the first operating member acts in turn on the first valve actuator to move the valve member from an open position to a closed position and vice versa, wherein the cam surface is configured such that, by rotating the rotary control member, in use, a user can select whether the first valve is open or closed.