Self-Closing Tap Cartridge With Anti-Rotation Plunger Timing
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Solution Overview
Problem
Existing self-closing taps face issues with unintentional alteration of the longitudinal position of the plunger on the piston shaft due to vibrations, asymmetric forces, and temperature changes, leading to inconsistent closure times and potential mechanical failure of the set screw and adhesive solutions.
Innovation Solution
A self-closing tap design featuring a cartridge with a piston and plunger where the plunger is fixed to the piston shaft via helical threads, and a tap handle interface that prevents rotation of the plunger and piston shaft, ensuring the longitudinal position remains stable during use, thus eliminating the need for set screws and adhesives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If set screw and adhesive are used to fix the plunger position, then the plunger can be secured, but the system becomes susceptible to mechanical failure under vibration and extended use
Solution Approach 1:
The patent replaces the mechanical fixing system (set screw and adhesive) with a helical thread engagement system. The plunger features external helical threads that engage with internal helical threads in the piston shaft, creating a mechanical interlocking mechanism that prevents relative rotation and maintains longitudinal position without requiring additional fastening components.
Solution Approach 2:
The patent employs different material properties for the plunger and piston shaft to enable threaded engagement. The plunger is made with threaded material that can be formed with external helical threads, while the piston shaft contains corresponding internal threaded receptacles, creating a composite structural solution that integrates both fixing and positioning functions.
2Ease of operation
If the plunger can rotate on the piston shaft, then adjustment is possible, but unintentional alteration occurs due to vibration and asymmetric forces
Solution Approach 1:
The patent creates a dynamic system where the plunger can rotate along the helical threads during intentional adjustment, but the helical thread geometry converts rotational motion into controlled longitudinal movement. Once positioned, the same helical engagement prevents unwanted rotation and maintains stability under vibration and operational forces.
Solution Approach 2:
The helical threads act as an intermediary mechanism between the plunger and piston shaft. They provide a controlled interface that allows intentional position changes through rotation while simultaneously preventing unintentional movement, serving both adjustment and stabilization functions through the same mechanical structure.
3Stability of the object's composition
If set screw and adhesive are used to prevent rotation, then position stability is improved, but the risk of mechanical failure increases under violent vibration
Solution Approach 1:
The patent replaces the fragile adhesive-based mechanical system with a robust helical thread engagement system. The interlocking threads create a mechanical bond that distributes stress across multiple contact points and resists vibrational forces, eliminating the risk of adhesive failure while maintaining position stability.
Solution Approach 2:
The helical threads introduce a curved, continuous engagement surface between the plunger and piston shaft. This curved geometry provides gradual load distribution and mechanical interlocking that is inherently more resistant to shock and vibration compared to point-contact set screws or adhesive bonds.
4Adaptability or versatility
If the plunger position is adjustable, then closure time can be optimized, but the complexity of the fixing mechanism increases
Solution Approach 1:
The patent merges the adjustment mechanism and the fixing mechanism into a single integrated helical thread system. The same threaded engagement that allows rotational adjustment for timing optimization also serves as the securing mechanism, eliminating the need for separate set screws, adhesives, or locking devices.
Solution Approach 2:
The helical thread structure performs multiple functions simultaneously: it enables intentional position adjustment through rotation, maintains longitudinal positioning, prevents unwanted rotation under vibration, and provides mechanical securing without additional components. This multi-functionality reduces overall system complexity while maintaining adaptability.
Data Source
AI summary
A self closing tap (102) comprising a cartridge (12) and a tap handle interface is disclosed. The cartridge (12) comprises a piston (122), and a plunger (32). The piston (122) is comprised of a piston head (124), and a piston shaft (126), the piston shaft (126) has a longitudinal axis (A) and is fixed to the piston head (124) at a first end, and the second end of the piston shaft (126) is an engagement end (182). The plunger (32) is movably fixed to a first portion of the piston shaft (126) and adapted to move longitudinally along the first portion of the piston shaft (126). The plunger (32) has a first and second end with the second end of the plunger (32) being closer to the engagement end (182) of the piston shaft than the first end, the tap handle interface comprises a first and second recess (186, 154), the first recess (186) is adapted to receive the engagement end (182) of the piston shaft (126) and prevent rotation of the piston shaft (126) around its longitudinal axis (A), and the second recess (154) is adapted to receive at least the second end (126) of the plunger (32) and to prevent rotation of the plunger (32) around the piston shaft (126).