Embedded Shower Valve Anti-Vandal Sealing Mechanism
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Solution Overview
Problem
Existing water flow control devices for showers and toilets embedded in walls are vulnerable to vandalism and suffer from poor sealing due to large clearances between elements, affecting their tightness.
Innovation Solution
The device incorporates a dual-path movement for the front face into its fixing position, featuring an O-ring seal with increasing compression, hook-shaped lugs and housings for secure attachment, and a blocking screw to prevent disassembly, enhancing security and sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If screws are used to fix the intermediate face to the housing, then the device is easy to install, but the device becomes vulnerable to vandalism and easy to remove
Solution Approach 1:
The fixing mechanism is divided into multiple independent elements: hook-shaped lugs on the intermediate face that engage with corresponding receptacles in the housing, and a separate blocking screw that prevents reverse rotation. This segmentation allows each element to perform a specific function - the lugs provide structural attachment while the screw provides anti-vandalism protection.
Solution Approach 2:
The hook-shaped lugs are pre-formed on the intermediate face during manufacturing, positioned to engage with receptacles in the housing. This preliminary preparation of the fixing elements enables quick installation while the blocking screw is added subsequently to prevent removal, combining ease of installation with security.
2Ease of manufacture
If a simple gasket is used for sealing between components, then the device is easy to assemble, but significant play between components compromises the seal
Solution Approach 1:
The sealing approach changes from a simple gasket relying on component tolerance to an O-ring seal that actively adapts to clearance variations. The O-ring's elastic properties allow it to deform and fill gaps caused by play between components, maintaining sealing effectiveness despite manufacturing tolerances and assembly variations.
Solution Approach 2:
The sealing system combines the O-ring seal (elastomeric material) with the rigid housing and intermediate face structures. The elastomeric O-ring compensates for rigid component clearances through its ability to deform elastically, creating an effective seal despite the rigid nature of the main structural components.
3Ease of operation
If the front face is fixed with simple screws, then the device is easy to disassemble, but the device lacks protection against vandalism
Solution Approach 1:
The blocking screw creates a dynamic locking mechanism where the screw threads engage with the receptacle during normal installation (allowing assembly), but the headless design and positioning create resistance to reverse rotation (preventing vandalism). The mechanism transitions from a simple fastening state to a locked state that requires specific actions to open.
4Device complexity
If standard sealing methods are used between intermediate face and front face, then the assembly is simple, but the seal is compromised due to play between components
Solution Approach 1:
The sealing method changes from rigid gasketing to elastic O-ring sealing, where the seal element's material properties (elasticity) are changed to accommodate clearance variations. This allows the same assembly process to achieve both simplicity and reliable sealing despite component play.
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 solution provides a more secure and tightly sealed water flow control device that is complex to disassemble, thereby preventing vandalism and ensuring better tightness by using a combination of O-ring seals, hook-shaped lugs, and blocking screws.
Implementation Method 1
a sealing O-ring (6) arranged between the intermediate face (3) and the front face (5)... the compression applied to the sealing O-ring increases as the front face moves towards its final fixing position
Implementation Method 2
at least one lug, preferably three lugs distributed evenly along the perimeter, and at least one housing, preferably three housings, is formed in the intermediate face... the lug(s) have a hook shape and the fixing is achieved by hooking the lug(s) to a respective tab formed in the respective housing
Implementation Method 3
at least one screw, in particular a headless screw, provides mutual locking of the front and intermediate faces in the final fixing position... the locking prevents any movement in the direction opposite to the direction of the second insertion path
Data Source
Figure 1~2
Figure 3A~4
Figure 5~6
AI summary
The invention relates to a device for controlling the flow of water, of shower or of a sanitary facility for example, to be embedded in a mounting, in particular in a wall, including: a main casing (1) open toward the outside and received in a recess formed in the mounting, the elements for controlling the device being received in the main casing by projecting from same through the opening; an intermediate plate referred to as intermediate surface (3) that is washer-shaped and is attached to the edge of the opening of the main casing, the attachment being achieved, in particular, by screws, particularly by four screws distributed evenly over the circumference of the intermediate surface; and a front surface plate (5) attached to the intermediate surface such as to close the casing, allowing only the elements for controlling the faucet to pass through same, for example, the handle for controlling the mixing valve and the button for adjusting the temperature; and a seal (6), in particular an O-ring seal, providing sealing between the intermediate surface (3) and the front surface (5) extending along the outer edge of the front surface (5) and/or of the intermediate surface (3) by being closer to the outer edge than to the inner edge, the arrangement being such that the attachment of the front surface (5) to the intermediate surface (3) occurs following a movement of the front surface (5) relative to the intermediate surface (3), comprising a component in the direction parallel to the planes of the two surfaces.