Valve Knob Snap-Fit Connection Mechanism
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Solution Overview
Problem
The existing connection methods between the operating knob and the manoeuvring stem in valves are slow and difficult to engage/disengage, particularly due to the requirement of screwing/un screwing a threaded element.
Innovation Solution
A valve design featuring grooved radial elements on the manoeuvring stem and the operating knob, with an elastically deformable holding element that allows for a snap-fit connection, enabling faster and easier attachment and detachment by guiding the knob onto the stem and utilizing a coupling seat for secure engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a threaded element is used to firmly fix the knob to the manoeuvring stem, then the connection strength is improved, but the ease of operation deteriorates due to the slow and difficult screwing/unscrewing process
Solution Approach 1:
The patent changes the connection mechanism from threaded (screw-based) to snap-fit (elastic deformation-based). The holding element utilizes elastic deformation to engage with the coupling seat, transforming the connection parameter from rotational threading to linear snapping motion, thereby enabling quick attachment and detachment while maintaining secure fastening
Solution Approach 2:
The patent replaces the threaded mechanical connection system with an elastic snap-fit system. The holding element's elastic properties allow it to deform during insertion and then snap into the coupling seat, substituting the complex threaded engagement with a simple elastic deformation mechanism that achieves both strength and ease of operation
2Reliability
If a threaded element is used to connect the knob to the stem, then the connection reliability is improved, but the productivity deteriorates due to the time-consuming engagement process
Solution Approach 1:
The patent transforms the connection parameter from threaded engagement to elastic snap-fit engagement. The holding element's elastic deformation allows for rapid insertion and secure locking, changing the fundamental mechanism from slow rotational threading to fast linear snapping, thereby improving productivity while maintaining reliability
Solution Approach 2:
The holding element is pre-formed with elastic properties that enable it to deform during insertion and automatically snap into the coupling seat. This preliminary elastic deformation capability allows the connection to be established quickly without requiring manual manipulation of threads, thus improving connection speed while ensuring reliable engagement
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
Facilitates quicker and more efficient connection of the operating knob to the manoeuvring stem, allowing for easier operation while maintaining a secure fastening mechanism.
Implementation Method 1
an elastically deformable holding element that allows for a snap-fit connection
Data Source
Figure 1
Figure 2
AI summary
A valve comprising a manoeuvring stem (7) provided with at least one end portion (20) and an operating knob (12) provided with an end portion (13) to be coupled to said at least one end portion of the stem by means of one or more grooved elements (9,15), wherein the end portion of the knob and/or terminal portion of the stem comprises at least one housing seat (16) accommodating at least one holding means (11) to be snap-engaged on at least one coupling seat (10) provided on the terminal portion of the stem and/or end portion of the knob, respectively.