Removable Resilient Alignment Guide for Door Handle Trim
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Solution Overview
Problem
Contemporary door handle assemblies with square or rectangular trims are difficult to install plumb due to the installer only seeing one side, leading to crooked or tilted trim pieces, and current alignment features are rigidly attached, exacerbating misalignment issues, especially with imperfect boreholes.
Innovation Solution
A door handle assembly featuring an interior and exterior chassis with removable alignment guides made of resilient material, allowing for self-alignment of trim pieces using a semi-flexible design that accommodates door misalignment and imperfect boreholes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigid alignment features are used to attach trim pieces, then the trim pieces are securely fixed, but misalignment is exacerbated due to poor door preparations and imperfect boreholes
Solution Approach 1:
The alignment guide is made from a semi-flexible material that can change its physical state between flexible and rigid. During installation, the guide is flexible to accommodate misalignment, then becomes rigid to provide secure fixation. This parameter change resolves the contradiction by allowing the same component to serve both alignment and fixation functions at different stages.
Solution Approach 2:
The alignment guide transitions from a flexible state during installation to a rigid state during operation. The semi-flexible material allows dynamic adaptation: it bends to accommodate imperfect boreholes during installation, then maintains a stable rigid form to provide secure long-term fixation, resolving the contradiction between flexibility for alignment and rigidity for strength.
2Stability of the object's composition
If the alignment guide is made rigid, then it provides stable alignment, but it cannot accommodate imperfect boreholes and door misalignment
Solution Approach 1:
The alignment guide's material property changes from flexible to rigid, allowing it to adapt to imperfect boreholes during installation while maintaining stable alignment during operation. This parameter change enables the guide to provide both adaptability and stability at appropriate times.
Solution Approach 2:
The semi-flexible material acts as a cushion that absorbs misalignment errors before the trim piece is fully installed. The flexibility compensates for imperfect boreholes in advance, allowing the rigid trim piece to be properly positioned even when the borehole is not perfectly aligned.
3Stability of the object's composition
If the alignment guide is permanently attached, then it maintains alignment, but it cannot be removed or adjusted if misalignment is detected
Solution Approach 1:
The alignment guide is designed as a separate, removable component that can be detached from the trim piece. This segmentation allows the guide to be removed for adjustment or replacement while the trim piece remains installed, resolving the contradiction between maintaining alignment stability and enabling easy repair.
4Adaptability or versatility
If the alignment guide is made flexible, then it accommodates misalignment, but it may not provide sufficient structural support
Solution Approach 1:
The alignment guide transitions from a flexible state during installation to a rigid state during operation, providing both misalignment accommodation and structural support at different stages. The semi-flexible material enables this dual functionality.
Solution Approach 2:
The guide exhibits dynamic mechanical properties, being flexible when needed for alignment and rigid when needed for support. This dynamic behavior allows the same component to satisfy both adaptability and strength requirements without compromise.
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 easy and accurate alignment of interior and exterior trim pieces during installation, ensuring straight trim installation and preventing tilting, even with varying door thicknesses and borehole imperfections.
Implementation Method 1
The alignment guide is formed of a resilient material
Data Source
AI summary
A door handle assembly includes an interior chassis, an exterior chassis, and an alignment guide. The interior chassis includes an interior trim portion, an interior handle mount rotatably attached to the interior trim portion, and an interior spindle portion rotatable with the interior handle mount. The exterior chassis includes an exterior trim portion, an exterior handle mount rotatably attached to the exterior trim portion, an exterior spindle portion rotatable with the exterior handle mount and axially aligned with the interior handle mount, and a mounting post extending toward the interior chassis from the exterior trim portion offset from the exterior spindle portion. The alignment guide is removably attached to the interior trim portion and is formed of a resilient material. The alignment guide extends toward the exterior chassis from the interior chassis and includes an aperture aligned to receive the mounting post.