Sliding Door Roller Assembly That Prevents Door Sagging
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Solution Overview
Problem
Sliding doors on vehicles sag due to downward pressure, causing misalignment with the door opening when closed, as existing roller assemblies flex under the door's weight.
Innovation Solution
A roller assembly with an L-shaped bracket and support bracket, designed with an initial angle greater than 90° that deflects to 90° under load, preventing sagging and maintaining door alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a roller assembly is used to support a heavy sliding door, then the door can be moved between open and closed positions, but the roller assembly flexes downward under the door's weight causing the door to sag and misalign with the door opening
Solution Approach 1:
The L-shaped bracket is pre-configured with an angle greater than 90 degrees (e.g., 95-105 degrees) between its vertically oriented and horizontally oriented portions. This preliminary geometric configuration creates a built-in counteracting mechanism that compensates for the downward flexing force when the door is installed, preventing sagging and maintaining proper alignment without requiring active adjustment mechanisms
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 design maintains door alignment by allowing the brackets to deflect to 90° under load, preventing sagging and ensuring proper door closure.
Implementation Method 1
An angle between the vertically oriented portion and the horizontally oriented portion of the L-shaped bracket is more than 91° when the roller assembly is not under load from the sliding side door. The L-shaped bracket is configured such that the angle between the vertically oriented portion and the horizontally oriented portion of the L-shaped bracket is 90° when the roller assembly is under load from the sliding side door.
Data Source
AI summary
A roller assembly includes an L-shaped bracket and a support bracket, each having a preformed bend that is greater than ninety degrees, but that when under a load of a sliding side door of a vehicle, is configured to decrease under the load to ninety degrees. The roller assembly also includes a roller arm supported between the L-shaped bracket and the support bracket and extending laterally from the brackets for engaging a rail on the body of the vehicle. A spacer is included between the roller arm and the support bracket, preventing contact between them and thus allowing for decreased friction between them.