Door Hinge Eccentric Adjustment Single Tool
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Solution Overview
Problem
Existing door hinges require two separate tools for adjustment, leading to complexity and inefficiency due to the need for clamping screws to prevent movement, which can result in misalignment and increased installation time.
Innovation Solution
A door hinge design where the eccentric is mounted with a screw thread on the first adjustment part, enhancing self-locking and allowing a single tool to adjust and clamp, simplifying the adjustment process by converting rotational force into linear displacement without additional locking means.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If clamping screws are used to prevent movement during adjustment, then the door hinge can be locked in position, but two separate tools are required (one for loosening clamping screws and one for operating the eccentric)
Solution Approach 1:
The patent combines the clamping screw and the eccentric adjustment mechanism into a single integrated component. The eccentric element serves both as the adjustment mechanism and as the clamping element, eliminating the need for separate clamping screws and reducing the number of tools required from two to one.
Solution Approach 2:
The eccentric element is designed to perform multiple functions: it enables adjustment through rotation, provides self-locking through its geometric shape, and acts as the clamping mechanism. This multi-functional design eliminates the need for separate dedicated clamping screws and adjustment mechanisms.
2Reliability
If clamping screws are used to brace adjustment parts, then frictional locking is achieved, but additional locking means increase installation time and complexity
Solution Approach 1:
The eccentric mechanism provides self-locking through its geometric design. As the eccentric is rotated during adjustment, its offset center creates natural binding forces that lock the adjustment parts in position without requiring additional clamping screws or external locking actions. The system serves itself by converting the adjustment motion into automatic locking.
3Device complexity
If a simple sleeve bearing is used for the eccentric, then the structure is simple, but the contact area is small leading to poor self-locking
Solution Approach 1:
The patent employs a cylindrical eccentric element with a curved outer surface that engages with a corresponding curved groove in the adjustment part. This curved geometry increases the contact area between the eccentric and the adjustment component, significantly improving self-locking capability compared to a simple flat sleeve bearing, while maintaining relatively simple structural form.
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 improved self-locking mechanism allows for precise adjustment and secure positioning of the door hinge with a single tool, reducing installation time and eliminating the need for separate tools, thus simplifying the adjustment process.
Implementation Method 1
The eccentric (8) is mounted in the first adjustment part (5) by a screw thread connection (8b, 5a)
Implementation Method 2
the contact area between the eccentric and the first adjustment part is increased in comparison to a simple sleeve bearing. This leads to greater self-locking of the eccentric
Data Source
AI summary
A door hinge has a first leaf assembly, a second leaf assembly pivotally mounted on the first leaf assembly, a first adjustment part on the first leaf assembly, and a second adjustment part adjustable in an adjustment direction relative to the first adjustment part. An eccentric mounted on the first adjustment part for rotation about an eccentric axis engages in the second adjustment part. A screw thread connection secures the eccentric to the first adjustment part.