Lockset Retainer Resiliently Deflects to Prevent Screw Disengagement
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Solution Overview
Problem
Existing lockset assemblies with bayonet connections between interior and exterior knob assemblies face issues with screw movement relative to the rose liner, leading to partial or complete disengagement, which compromises the strength and reliability of the connection.
Innovation Solution
A retainer is introduced that is coupled to the rose liner and features screw receivers that resiliently deflect to capture and align screws within openings, ensuring secure engagement and preventing undesired disengagement, providing both physical and audible feedback during installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a bayonet connection with screws and rose liner is used to couple interior and exterior knob assemblies, then the connection allows for easy assembly and disassembly, but the screw heads may move relative to the rose liner during use, leading to partial or complete disengagement and reduced connection strength
Solution Approach 1:
A retainer component is introduced as an intermediary element between the screw and the rose liner. The retainer includes a pocket that receives the screw head and engagement features that prevent the screw from backing out, while still allowing for controlled assembly and disassembly operations.
Solution Approach 2:
The connection system is divided into separate functional components: the rose liner with openings, the screw with head, and the retainer with pocket and engagement features. This segmentation allows each component to perform its specific function - the retainer prevents disengagement while the screw provides the fastening force.
2Device complexity
If the rose liner has openings that receive screw heads directly, then the structure remains simple, but the screw heads can move relative to the openings, compromising the bayonet connection
Solution Approach 1:
The retainer serves as an intermediary component inserted into the rose liner's opening system. It provides the screw reception function while adding the necessary retention features, effectively enhancing reliability without requiring a complete redesign of the rose liner structure.
Solution Approach 2:
The retainer is nested within the rose liner structure, with the retainer's outer dimensions fitting within the rose liner's internal cavity. This nesting approach allows the retainer to function within the existing structural envelope without adding external complexity.
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 retainer enhances the alignment and retention of screws within the bayonet connection, significantly improving the strength and reliability of the lockset assembly by restricting screw disengagement during use and environmental conditions.
Implementation Method 1
the retainer resiliently deflects to allow for the opening to at least partially capture the screw and engage with the retainer
Data Source
AI summary
A lockset assembly includes a first knob assembly having a projection with an enlarged head. A second knob assembly is configured to couple to the first knob assembly along a first axis. The second knob assembly including a rose liner with an opening is configured to receive the enlarged head of the projection in a bayonet connection. A retainer is coupled to the rose liner. The retainer defines a pocket shaped and sized to at least partially receive the projection, and the pocket is axially aligned with the opening. As the enlarged head is received within the opening, the retainer resiliently deflects to capture the projection within the pocket restricting disengagement of the enlarged head from the opening.