Height-Adjustable Hinge Reducing Sliding Friction
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Solution Overview
Problem
Existing height-adjustable door hinges experience high sliding friction forces when doors or windows are pivoted, leading to increased wear.
Innovation Solution
A door hinge design featuring a single drive part that rotates about its longitudinal axis to adjust height, interacting with an external thread on a tubular part and internal thread of the inner hinge, with minimal play between components, and incorporating sliding elements to reduce friction, and a secure drive part mechanism to prevent loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple bearing parts with internal threads are used in each cylindrical bearing section, then height adjustment is achieved, but the structure becomes complex and assembly difficult
Solution Approach 1:
The patent combines multiple bearing parts into a single tubular part with external threading that engages with the cylindrical bearing sections. This single tubular part integrates the functions of multiple separate bearing parts, eliminating the need for multiple internal threads and reducing structural complexity while maintaining height adjustment capability through rotation about the longitudinal axis
2Adaptability or versatility
If traditional multi-component bearing arrangements are used, then height adjustment is possible, but sliding friction forces are high causing increased wear
Solution Approach 1:
The patent replaces the traditional mechanical bearing arrangement with a tubular part that rotates about its longitudinal axis. This rotational movement substitutes for the sliding motion of traditional bearings, significantly reducing sliding friction forces and associated wear while achieving the same height adjustment function
3Ease of manufacture
If the drive part is not securely retained, then assembly is simple, but the drive part can be lost during operation
Solution Approach 1:
The drive part is nested within the tubular part, which itself is received within the cylindrical bearing sections. This nested arrangement naturally retains the drive part in position during operation while maintaining assembly simplicity. The tubular part acts as a retaining structure that prevents the drive part from being lost
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 solution significantly reduces sliding friction, minimizes wear, and simplifies assembly by maintaining consistent play between components and providing a secure drive part mechanism.
Implementation Method 1
The tubular part has an external thread which interacts with an internal thread of the cylindrical bearing section of the inner door hinge part. By twisting the tubular part, it is adjusted in the axial direction.
Implementation Method 2
Sliding elements are arranged between the facing end faces of the cylindrical bearing sections of the outer door hinge part and the end faces of the tubular part. In particular, provision is made to arrange two sliding elements in each case between two end faces facing one another, since the sliding friction can be further reduced in this way.
Data Source
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AI summary
The door hinge has an inner door hinge element (2) and an outer door hinge element (1), where the inner and outer door hinge elements have fastening units (1b,2b) for mounting on the door frame or on the door. The cylindrical bearing section (2a) of the inner door hinge part has an inner thread (2c), in which a tubular part (3) is screwed with its external thread (3g). The length (L3) of the tubular part is larger than the axial length of the cylindrical bearing section.