Window Hinge Fittings with Inclined Pin
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Solution Overview
Problem
Existing hinge fittings for windows and doors suffer from misalignment of hinge bodies under load, particularly when used for cantilever mounting, leading to visual imperfections and wobbling issues due to vertical bearing pin deflection.
Innovation Solution
The bearing pin is arranged at an angle opposite to the vertical during mounting, with a bushing made of hard-wearing plastic, allowing the hinge bodies to align under load, and the bushing's inclination is adjusted based on sash weight to compensate for deformation, using an inclined socket design and coding for precise assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the bearing pin is arranged vertically in the hinge fitting, then the hinge bodies are aligned in the unloaded state, but the bearing pin deflects from vertical under load causing misalignment of hinge bodies
Solution Approach 1:
The bearing pin is pre-inclined at an angle opposite to the expected deflection direction caused by sash weight. This preliminary anti-action compensates for the load-induced deflection, ensuring that under load the pin becomes vertical and the hinge bodies remain properly aligned, eliminating the need for post-installation adjustment.
2Stability of the object's composition
If the bearing pin is inclined to compensate for load deformation, then the hinge bodies are aligned under load, but the bearing pin is not vertical in the unloaded state
Solution Approach 1:
The bearing pin is deliberately installed at an inclined angle (e.g., 0.5-3°) relative to vertical, which is the opposite of the expected deflection direction under load. This pre-inclination ensures that when the sash weight acts on the pin, the pin deflects to become vertical under load, achieving proper hinge body alignment only when needed.
3Adaptability or versatility
If an inclined bearing is used to accommodate the inclined bearing pin, then the bearing pin can be inclined, but the manufacturing complexity increases due to inclined drilling requirements
Solution Approach 1:
A bushing is introduced as an intermediary component between the hinge body and the bearing pin. The bushing is designed with an inclined bore that accommodates the inclined bearing pin, while the bushing itself is installed in a vertically drilled hole in the hinge body. This intermediary allows the complex inclined bearing pin to be manufactured separately and simply installed, avoiding the need for complex inclined drilling of the hinge body itself.
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
This solution ensures the upper and lower hinge bodies remain aligned under load, preventing visual misalignment and wobbling, while allowing for easy adjustment and manufacturing of extruded profile hinge bodies without additional drilling.
Implementation Method 1
the bearing pin is arranged at an angle opposite to the vertical of a load deformation when the hinge fitting is mounted... Under load, when the weight of the sash acts on the bearing pin, the bearing pin is slightly deformed so that the two hinge bodies come to rest on top of each other
Data Source
Figure 1
Figure 2~4
AI summary
The fitting has an edge-sided hinge body (11) and a leaf-sided hinge body (12), where each body has a passage opening for accommodating a bearing pin (15) with a section. The bearing pin is arranged against a loaded deformation during mounting of the fitting. A sleeve (20) is plugged into the passage opening of the edge-sided hinge body and manufactured from a low-wear plastic. The sleeve has a retaining device (23) for the bearing pin, where the hinge bodies are designed as extruded sections.