Non-Round Metallic Snap Ring for Rosette Fitting Assembly
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Solution Overview
Problem
Existing rosette fittings for doors and windows are complex to assemble, risk damaging elastomer components during disassembly, and have a deep overall structure, which complicates manufacturing and increases assembly time and transport costs.
Innovation Solution
A rosette set using a non-round metallic snap ring that can be clipped into the substructure part's outer groove and expands radially into the cover rosette's inner groove, allowing for orthogonal assembly and providing a secure, anti-twist connection without requiring high dimensional accuracy, and can be easily detached using a rosette lifter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a torsion spring is used as the retaining element, then the connection between substructure part and cover rosette is secure, but the mounting process becomes complicated and time-consuming
Solution Approach 1:
The patent changes the geometric parameter of the snap ring from circular to non-circular (oval or elliptical shape). This parameter change allows the snap ring to be easily inserted in a compressed state and then expand to engage with the grooves, transforming a complex torsion spring mechanism into a simple elastic deformation process that reduces mounting time while maintaining secure connection
Solution Approach 2:
Instead of extending the retaining element (as required by torsion springs), the patent uses compression to insert the snap ring. The snap ring is compressed to fit into the outer circumferential groove, then naturally expands to lock in place. This inverted approach (compression vs. extension) simplifies the mounting process significantly
2Ease of operation
If an O-ring-shaped elastomeric element is used, then the assembly is simple, but the elastomeric part is damaged or destroyed during disassembly
Solution Approach 1:
The patent changes the material parameter from elastomeric to metallic, and the geometric parameter from circular to non-circular. The metallic snap ring with oval/elliptical cross-section provides both the simplicity of elastomeric assembly and the durability of metal construction, as it can be repeatedly compressed and expanded without damage
Solution Approach 2:
The snap ring is designed to dynamically change its diameter through elastic deformation. During assembly, it is compressed to a smaller diameter for insertion, then expands to its natural diameter to engage the grooves. This dynamic behavior allows easy assembly and disassembly while maintaining structural integrity and component durability
3Strength
If traditional rosette designs are used, then sufficient retaining strength is achieved, but the overall installation depth becomes large
Solution Approach 1:
The patent moves the retaining function from the axial dimension to the radial dimension. The snap ring engages with grooves through radial expansion, creating a secure connection without requiring significant axial depth. This dimensional shift allows shallow installation while maintaining strong retaining capability
Solution Approach 2:
The snap ring is nested within the grooves of the substructure part and cover rosette. The oval/elliptical snap ring fits within the outer circumferential groove, and when expanded, engages with the inner circumferential groove, creating a compact nested arrangement that minimizes installation depth while providing secure retention
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
This design simplifies assembly and disassembly, reduces the overall depth of the rosette set, lowers assembly time, and allows for mass production of doors with reduced transport volume, minimizing the risk of damage and theft by enabling on-site assembly of cover rosettes with a minimal axial construction depth.
Implementation Method 1
the snap ring can be displaced radially inwards and then snaps into the inner circumferential groove of the cover rosette with elastic expansion radially outwards
Implementation Method 2
the snap ring can be displaced radially outwards by slight expansion and subsequently snaps into the outer circumferential groove of the substructure part by elastic contraction radially inwards
Data Source
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AI summary
The invention relates to a rosette set (2) for a key or cylinder opening or for handles on doors or windows, comprising a substructure part (4) mountable against a door or window sash, having an outer circumferential groove (14), a cover rosette (8) with an inner circumferential groove (32), and a metallic retaining element (6) that does not extend circumferentially and has a circumferential shape deviating from the circular shape, and which, in the mounted state, is received between the substructure part (4) and the cover rosette (8) and, in this state, bears against the substructure part (4) in some areas with its inner circumference and against the cover rosette (8) in some areas with its outer circumference.