U-Shaped Bracket Repair for Door Hinge Screw Hole Enlargement
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Solution Overview
Problem
Repeated opening and closing of doors, especially in public buildings, leads to loosening of hinge screws, causing enlarged screw holes and making it impossible to reattach the hinge in the original location, often resulting in the door needing to be discarded.
Innovation Solution
A U-shaped bracket is mounted to the damaged door edge, with a mounting plate attached to the bracket, allowing the hinge to be securely reattached while maintaining flush alignment with the door surface, using spacers to ensure the hinge plate is flush with the bracket.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If hinge screws are repeatedly tightened to secure the hinge, then the hinge attachment strength is improved, but the screw hole enlargement occurs making reattachment impossible
Solution Approach 1:
A U-shaped bracket serves as an intermediary component between the door and the hinge. The bracket is mounted to the door edge and provides a fresh mounting surface for the hinge, allowing the hinge to be reattached without using the damaged original screw holes. This mediator approach resolves the contradiction by decoupling the hinge attachment from the deteriorated door material.
Solution Approach 2:
The solution segments the hinge mounting function into two separate components: the U-shaped bracket that attaches to the door, and the hinge mounting plate that attaches to the bracket. This segmentation allows each component to be optimized independently - the bracket handles the door attachment while the mounting plate provides the hinge interface, avoiding the screw hole enlargement problem.
2Reliability
If a bracket is added to repair the hinge area, then the hinge can be reattached to the door, but the device complexity increases
Solution Approach 1:
The U-shaped bracket and hinge mounting plate are designed as an integrated assembly where the mounting plate is positioned within the recess of the bracket. This merging of functions into a single repair unit reduces the overall complexity compared to using separate bracket and mounting components, while still providing reliable hinge reattachment capability.
Data Source
AI summary
A kit for repairing a damaged hinge portion of a door. A U-shaped bracket is mounted to the door. A mounting plate is attached to the bracket. A hinge is mounted to the mounting plate and is flush with the bracket.