Adjustable Door Sill Height Mechanism
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Solution Overview
Problem
Existing door sills face issues with complex installation processes, exposed adjustment screws leading to leakage and aesthetic concerns, and increased production difficulties due to complex nut structures and retainer clip support systems.
Innovation Solution
A height-adjustable door sill with a rail carrier assembly featuring a rail cap, rail carrier, flange nut, and adjustment screw, where the rail carrier fits into a groove on the sill deck, and the adjustment screw drives the flange nut to adjust height, with a limiting flange and spikes for stability and a seamless rail cap for imperviousness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the adjustment screw is exposed for easy adjustment, then the ease of operation is improved, but the imperviousness deteriorates causing leakage
Solution Approach 1:
A cover plate is introduced as an intermediary component that hides the adjustment screw while still allowing access for adjustment operations. The cover plate serves as a mediator between the aesthetic requirement (hidden adjustment mechanism) and the functional requirement (easy adjustment), resolving the contradiction by providing both concealment and accessibility.
2Device complexity
If the retainer clip is used to support the rail cap and rail carrier, then the assembly is simplified, but the reliability deteriorates when the retainer clip loosens
Solution Approach 1:
The support function is merged from a separate retainer clip component into the flange nut structure itself. The flange nut's flange directly supports the rail cap and rail carrier, combining the fastening and support functions into a single reliable component, thereby eliminating the unreliable separate retainer clip while maintaining assembly simplicity.
3Device complexity
If the adjustment nut has a U-shaped structure with small contact area, then the assembly is simplified, but the strength deteriorates due to increased pressure intensity
Solution Approach 1:
The support function is merged into the flange nut's flange structure, which provides a large contact area with the sill deck. This eliminates the need for a separate U-shaped adjustment nut while simultaneously providing both the fastening function and the distributed contact area needed for strength, resolving the contradiction between simplicity and strength.
4Adaptability or versatility
If multiple components (rail cap, rail carrier, retainer clip, adjustment nut, adjustment screw) are used, then the functionality is comprehensive, but the device complexity increases
Solution Approach 1:
Multiple components are merged into a streamlined assembly where the flange nut integrates the support and fastening functions, the cover plate integrates the aesthetic and protective functions, and the adjustment screw provides the height adjustment function. This reduction from five to essentially three main components maintains versatility while significantly reducing complexity.
Data Source
AI summary
The door sill includes a sill deck and a rail carrier assembly having a function of height adjustment. The rail carrier assembly is configured on the sill deck. The rail carrier assembly includes a rail cap, a rail carrier, an adjustment nut and an adjustment screw. The rail cap is snapped onto an upper end of the rail carrier. A groove is formed in the sill deck for the rail carrier to fit in. A nut installation hole is formed in the rail carrier. The adjustment nut is assembled at the nut installation hole, and is in threaded fit with the adjustment screw. The adjustment screw drives the adjustment nut to move up or down in an axial direction of the adjustment screw through rotation, thereby altering the height of the rail carrier fitted in the groove and altering the height of the rail cap.