Non-Circular Anchor Rod for Washstand Fitting Alignment
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Solution Overview
Problem
The existing fastening devices for washstands and kitchen fittings face difficulties in assembly due to the need for manual alignment of the fastening disc, which is challenging in cramped spaces and prone to incorrect installation, leading to loose fittings over time.
Innovation Solution
The anchor rod is designed with a non-circular cross-section and external threads, allowing form-fitting alignment with the fastening disc, and a knurled area for secure anchoring, ensuring correct angular positioning and preventing twisting during assembly and tightening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fastening disc is manually aligned during assembly, then the fitting can be securely fastened, but the assembly process becomes difficult and time-consuming in cramped spaces
Solution Approach 1:
The anchor rod is designed with a non-circular cross-section (e.g., D-shaped or with flattened areas) that creates a unique angular orientation. This asymmetric geometry allows the fastening disc to be aligned automatically during insertion, eliminating the need for manual alignment while ensuring secure fastening. The non-circular shape provides form-fitting engagement that maintains correct positioning throughout assembly and tightening.
2Ease of operation
If the anchor rod has a cylindrical shape with continuous threading, then the clamping nut can be easily moved, but the fastening disc cannot be aligned in the correct angular position
Solution Approach 1:
The anchor rod features localized non-threaded flattened areas or grooves on its circumference that create form-fitting engagement with corresponding recesses in the fastening disc. These local geometric features provide angular positioning accuracy without interfering with the continuous threading needed for nut movement. The threaded sections maintain full functionality while the non-circular cross-section ensures correct orientation.
3Reliability
If the fastening disc is tightened with the anchor nut, then reliable fastening is achieved, but the disc may twist and realign incorrectly at the last moment
Solution Approach 1:
The non-circular cross-section of the anchor rod (with flattened areas or grooves) creates a form-fitting engagement with the fastening disc that prevents rotational movement. This asymmetric geometry acts as a mechanical constraint that maintains stable angular positioning throughout the tightening process, preventing the disc from twisting or realigning incorrectly when the clamping nut is tightened.
Data Source
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AI summary
A fitting fixing device (100) for fixing a washbasin or kitchen fitting (200) in a tap hole (211) comprises at least: - an anchor rod (20) which is provided with an external thread over at least part of its length and which is provided at one end with an anchor head (22) for connection with a fitting body (200); - a clamp-shaped fixing washer (30) which has at least one guide recess (31) in which the anchor rod (20) is guided; - a clamping nut (10) with at least one internal thread (16) engaging in the external thread of the anchor rod (20) and with at least one drive (15); The cross-section of the anchor rod (20) over at least part of its length and the cross-section of the guide recess (31) are designed and matched to each other such that they are positively aligned with each other in at least one angular position and are at the same time axially displaceable relative to each other.The cross-section of the anchor rod section (20) and the cross-section of the guide recess (31) each have a reduced, non-circular shape compared to a circular one. In these cross-sections, one or more arc-shaped sections of the external thread remain, forming support points for guiding the clamping nut (10).