Door Fitting Cover Cap with Anti-Glare Ring
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Solution Overview
Problem
Existing door and window fittings can scratch door leaves or window frames during assembly due to the design of the cover cap, which contacts the frame, especially when the rosette is not round, leading to visible scratches.
Innovation Solution
The cover cap is designed with a depth that maintains a distance from the door or window frame, and an anti-glare ring covers the gap, preventing contact and scratches. This design includes a two-part cover panel with a cover cap and ring that can be produced in different materials and finishes, and an anti-rotation element to secure the ring in place, preventing unwanted rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the cover cap is designed to contact the door leaf or window frame, then the covering area is improved, but the door leaf or window frame is scratched during assembly
Solution Approach 1:
The cover cap is divided into two separate components: the functional cover cap that maintains distance to prevent scratching, and a separate decorative ring that provides the covering function. This segmentation allows each component to fulfill its specific function without causing harm.
Solution Approach 2:
The decorative ring acts as an intermediary element between the cover cap and the door leaf/window frame. It fills the gap created by the spaced cover cap, providing visual coverage while the cap itself remains non-contacting to prevent scratching.
2Object-affected harmful factors
If the cover cap is spaced from the door leaf or window frame, then scratching is prevented, but a visible gap is created
Solution Approach 1:
The decorative ring serves as a mediator that visually connects the spaced cover cap to the door leaf or window frame, eliminating the appearance of a gap while the cap itself remains non-contacting.
Solution Approach 2:
The decorative ring can be produced in different colors, materials, and surface finishes to match or complement the surrounding elements, making the gap invisible and enhancing the visual appearance.
3Ease of operation
If the cover cap is turned manually during assembly, then the locking mechanism operates, but the door leaf or window frame is scratched
Solution Approach 1:
By separating the rotating locking component (cover cap) from the decorative covering component (ring), the design allows manual rotation for locking without the decorative ring contacting and scratching the frame.
Solution Approach 2:
The decorative ring is extracted from the rotating assembly and made stationary, removing it from the path of rotation and eliminating the scratching hazard while preserving the manual locking function.
4Device complexity
If a single-piece cover panel is used, then the structure is simple, but design variations are limited
Solution Approach 1:
Dividing the cover panel into a functional cap and a decorative ring enables independent design and manufacturing of each component, allowing for diverse material choices, colors, and surface finishes while maintaining a relatively simple overall structure.
Solution Approach 2:
The modular two-piece design makes the cover cap universal and adaptable to different aesthetic requirements, as the decorative ring can be varied independently from the functional cap, allowing the same cap design to work with multiple ring styles.
Data Source
Figure 1
Figure 2
Figure 3a~5
AI summary
A door or window fitting comprises a mounting base (14), a bearing disc (29) for a handle (1), and a cover cap (28) that is rotationally fixed to the bearing disc (29). The cover cap (28) is deep enough that, when the door or window fitting is fully assembled, it creates a gap (A) between it and the door leaf (17) or window frame. The cover cap (28) is part of a cover plate (56), which additionally includes a cover ring (50) that can be placed on the cover cap (28) and covers the gap formed by the gap (A).