Valve Head Rotation Lock for Anti-Scalding Shower Fittings
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Solution Overview
Problem
Existing thermostatic shower and bathtub fittings with anti-scalding devices are complex to manufacture and impair the aesthetic appearance of the faucet.
Innovation Solution
A valve head with a spring-mounted locking element that engages in a recess of the spindle at a defined rotational position, allowing a rotation lock for anti-scalding protection without compromising the aesthetics, featuring a simplified mechanism that requires increased torque for further temperature adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rotation lock is integrated into the temperature selection handle, then anti-scalding protection is provided, but the aesthetic appearance of the faucet is impaired
Solution Approach 1:
The locking mechanism is extracted from the visible temperature selection handle and relocated to the valve head interior. The cylindrical locking body with notches is mounted on the spindle shaft within the valve head, where it engages with corresponding features on the spindle. This extraction removes the visual impact from the handle's aesthetic design while preserving the anti-scalding function through the same mechanical locking principle.
Solution Approach 2:
The locking mechanism is nested within the existing valve head structure. The cylindrical locking body is mounted on the spindle shaft and operates within the valve head's internal space, utilizing the existing cylindrical bore and positioning features. This nesting approach integrates the safety function into the existing form factor without requiring additional external components that would compromise aesthetics.
2Reliability
If a locking mechanism is integrated into the temperature selection handle, then anti-scalding protection is provided, but the manufacturing complexity increases
Solution Approach 1:
The spindle shaft serves multiple functions: it transmits rotational motion from the temperature selection handle to the valve element, and it simultaneously supports the cylindrical locking body that provides anti-scalding protection. The valve head's cylindrical bore and positioning features serve dual purposes as both structural support and mounting locations for the locking mechanism. This multi-functionality reduces the total component count and simplifies manufacturing compared to dedicated separate locking components.
3Ease of operation
If the locking mechanism is operated from the front of the valve head, then accessibility is improved, but the structural complexity increases
Solution Approach 1:
The cylindrical locking body is designed to be manually operable from the front through the temperature selection handle. Users can directly manipulate the locking mechanism by turning the handle, which rotates the spindle shaft and moves the locking body into or out of engagement with the spindle's locking features. This self-service design eliminates the need for separate actuating mechanisms, buttons, or external adjustment devices, maintaining simplicity while ensuring accessibility.
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
Provides effective anti-scalding protection while maintaining the aesthetic integrity of the fitting, with a simplified and accessible mechanism for temperature adjustment.
Implementation Method 1
An annular spring is arranged around the spindle, via which the at least one locking element is resiliently preloaded against the spindle
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a valve head for a sanitary fitting, in particular a shower or bath fitting, with a head piece (1) through which a spindle (3) is rotatably arranged in the head piece (1) but axially fixed and which is connected to a valve element which can be controlled via the spindle (3), wherein means for overcoming the maximum rotation angle of the spindle (3) are arranged, and wherein the means comprise at least one spring-loaded locking element which engages in a recess arranged in the spindle (3) or in the head piece in a defined rotational position of the spindle (3).