Door Lock Rose Assembly Spring Steel Plate
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Solution Overview
Problem
Conventional locksets face challenges in securely attaching and orienting non-round decorative roses to the lock chassis, leading to aesthetic issues, increased costs due to unnecessary components, and sensitivity to manufacturing tolerances, making it difficult to update or replace the rose without compromising the fit or causing deformation.
Innovation Solution
A rose assembly with a plate permanently secured to the rose, featuring a tab for alignment and a resilient member for secure attachment to the lock chassis, allowing for easy installation and removal while minimizing the impact of manufacturing tolerances and reducing unnecessary costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rose is permanently affixed to the lock chassis at factory assembly, then the attachment is secure and orientation is fixed, but the mounting screws must be accessible through openings in the rose which compromises aesthetics and prevents future replacement
Solution Approach 1:
The invention divides the attachment system into two separate components: spring clips attached to the lock chassis and a rose with engagement features. This segmentation allows the rose to be securely attached through the spring clips without requiring visible mounting screw holes, thus maintaining aesthetic quality while ensuring reliable attachment.
2Adaptability or versatility
If spring clips are attached to the lock chassis, then the rose can be releasably coupled, but unused clips increase cost when paired with roses that do not utilize them
Solution Approach 1:
The spring clips are designed with universal applicability to work with various rose configurations. The clips are attached to the lock chassis and can accommodate different rose types through their engagement features, making them a versatile solution that eliminates the need for different clip configurations while controlling costs through standardized components.
3Adaptability or versatility
If undercut features are added to the rose for snap engagement with spring clips, then releasable coupling is achieved, but the casting mold becomes more complex and secondary operations are required increasing cost
Solution Approach 1:
Instead of adding complex undercut features to the rose for engagement, the invention inverts the approach by providing protruding engagement features on the rose that fit into corresponding recesses in the spring clips. This simplifies the rose manufacturing process while achieving secure snap engagement.
4Reliability
If two spring clips are factory assembled to the rose with screws or rivets, then attachment is provided, but the position and orientation is sensitive to manufacturing tolerances and the rose size must be increased to accommodate fasteners
Solution Approach 1:
The invention merges the spring clips and rose into a single attachment system where the clips are pre-formed with engagement features that directly receive corresponding features on the rose. This eliminates the need for separate fasteners and reduces sensitivity to manufacturing tolerances by providing self-aligning engagement features.
5Reliability
If spring clips are attached to the rose, then attachment is provided, but one clip may become overstressed during installation causing permanent deformation and reduced retention effectiveness
Solution Approach 1:
The invention introduces the lock chassis as an intermediary component that distributes the attachment forces. The spring clips are attached to the chassis rather than directly to each other, allowing the chassis to absorb and distribute stresses evenly during installation and operation, preventing permanent deformation of individual clips.
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 secure, aesthetically pleasing, and cost-effective attachment method that allows for easy replacement of the rose without compromising the fit, reducing the risk of deformation and unnecessary component costs, while maintaining accurate orientation and retention.
Implementation Method 1
a resilient member configured to engage the retaining feature
Data Source
AI summary
A rose assembly for a door lock and a method of removably securing the rose assembly to a lock chassis. The rose assembly is secured to the lock chassis through the use of an intermediate spring steel attaching plate, which provides both a secure attachment to the lock and orientation of the rose assembly to the lock housing. A single spring plate with integrated retention clip features provides a removably attachable interface between the rose and the lock chassis. The spring plate includes a hook feature to provide positive retention of the rose that is independent of the spring clip features. Additionally, the spring clips are located to minimize the possibility that one clip deflects substantially more than another. The installation process includes inserting the hook feature into a slot in the chassis housing, and then snapping the clip features over the housing to seat and retain the rose.