Rosette with Elastic Fixing Elements for Screwless Door Handle Mounting
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Solution Overview
Problem
Existing rosettes for door and window handles or locks are difficult to attach and remove without visible screw holes and require additional cover rosettes, leading to increased material and manufacturing costs.
Innovation Solution
A rosette design featuring elastically deformable fixing elements, such as tongues, that can be pressed into a receiving opening without screw holes, allowing for secure fixation and easy removal by utilizing a guiding and locking element with thickened areas that engage behind the door or window frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If screws are used to fix the rosette to the door leaf, then the rosette can be securely fixed, but the screw holes become visible and additional cover rosettes are required, increasing material and manufacturing costs
Solution Approach 1:
The invention extracts the visible screw heads from the rosette structure by providing receiving openings that allow screws to be inserted from the rear side of the door leaf. The screws engage with threaded bores in the fixing elements, keeping all fastening components hidden behind the door surface while the rosette maintains full fixation security.
Solution Approach 2:
The fixing elements with threaded bores act as intermediaries between the rosette base body and the door leaf. These elements provide threaded engagement for screw fixation while extending through the door thickness, allowing screws to be concealed behind the door surface rather than visible on the rosette face.
2Reliability
If the rosette is designed with fixing elements that engage behind the door wall, then the rosette can be securely fixed without visible screws, but the installation process becomes more complex requiring pressing and deformation
Solution Approach 1:
The fixing elements are designed with elastic deformability, allowing them to be pressed into the door leaf and engage behind the door wall through controlled deformation. The elements can be inserted in a deformed state and then spring back to their original shape, creating secure engagement without requiring complex installation tools or procedures.
Solution Approach 2:
The fixing elements utilize elastic deformation as a temporary parameter change during installation. By applying pressing force, the elements deform to pass through the door thickness, then return to their original dimensions to engage behind the door wall, providing secure fixation while simplifying the installation process.
3Ease of operation
If the fixing elements are made elastically deformable to facilitate installation, then the rosette can be easily pressed into place, but the fixing elements may lose their locking capability
Solution Approach 1:
The fixing elements are segmented into distinct functional zones: a deformable insertion portion that allows easy installation through elastic deformation, and a locking portion with threaded bores that provides secure fixation. This segmentation allows each zone to optimize its function without compromising the other.
Solution Approach 2:
The fixing elements transition from a deformable state during installation to a rigid locked state after installation. The elastic deformation enables easy insertion, while the subsequent engagement of the threaded bores with screws creates a permanent, rigid locking connection that maintains fixation security.
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
Enables simple, cost-effective attachment and removal of rosettes without visible screws, reducing manufacturing costs and allowing for precise placement, while ensuring secure locking.
Implementation Method 1
elastically deformable fixing elements that extend from the mounting surface of the rosette's base body away from the receiving opening... When the lock cylinder is inserted, the inner surfaces of these fixing elements rest against the cylinder's outer surface... the fixing elements can no longer be pressed radially inwards when the lock cylinder is installed
Data Source
Figure 1a~1c
Figure 2a~2c
Figure 3
AI summary
A rosette (10, 20) for a door or window handle (30) or a door or window lock, which can be mounted on a receiving opening (41, 42) of a door leaf (40), a window frame or the like, has a base body (11, 21) with a contact surface (112, 212) for bearing against the door leaf (40), window frame or the like, a visible surface (111, 211) and a bearing opening (13, 23) for receiving and storing a handle neck (32) of the door or window handle (30) or a door or window lock, wherein a guide and locking element (12, 22) is arranged in the bearing opening (13, 23), with which the rosette (10, 20) is pressed into the receiving opening (41, 42) of the door leaf (40), window frame or the like. 20) to the door leaf (40), the window frame or the like in a pressure direction (x) perpendicular to the surface of the door leaf (40), window frame or the like in which the receiving opening (41, 42) is provided,wherein the guide and locking element (12, 22) has elastically deformable fixing elements (124, 224) which extend away from the bearing opening (13, 23) from the contact surface (112, 212) of the base body (11, 21), wherein at least two of the fixing elements (124, 224) have a thickening (127, 227) on their outer side facing away from the bearing opening (13, 23) spaced apart from the contact surface (112, 212) of the base body (11, 21), which in a mounting position of the rosette (10, 20) engage behind the receiving opening (41, 42) of the door leaf (40), window frame or the like. Furthermore, an arrangement of a door or window handle (30) and a rosette (10) on a receiving opening (41, 42) of a door leaf (40), a window frame or the like is described.