Hinge Strap Fastening with Multi-Plane Traction Means
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Solution Overview
Problem
The increasing mass of door leaves due to enhanced thermal insulation and security features leads to increased load on hinge straps, compromising their load-bearing capacity and requiring improved fastening solutions for sash and frame attachments.
Innovation Solution
The hinge tab design incorporates traction means arranged on both sides of a plane parallel to the hinge axis, with support projections and self-drilling screws to enhance holding forces through a frictional connection without the need for form-fitting components, allowing for increased load-bearing capacity without deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If traditional single-plane traction means are used, then the device complexity is low, but the holding force and load-bearing capacity are insufficient
Solution Approach 1:
The patent transitions from a single-plane traction arrangement to a three-dimensional configuration with traction means distributed on both sides of a reference plane. This spatial dimensionality change allows forces to be applied from multiple directions, significantly increasing the total holding force and load-bearing capacity without requiring form-fitting connections or plastic deformation.
Solution Approach 2:
The traction means are segmented into multiple discrete elements (first and second traction means) positioned at different locations and orientations. This segmentation allows each traction element to contribute independently to the total holding force, enabling the system to achieve higher cumulative force capacity while maintaining modular simplicity.
2Strength
If form-fitting connections with teeth are used, then the load-bearing capacity increases, but the ease of manufacture decreases due to plastic deformation requirements
Solution Approach 1:
The patent replaces the mechanical form-fitting connection system (teeth requiring plastic deformation) with a friction-based connection system. The multiple traction means create sufficient frictional force through normal pressure, eliminating the need for complex tooth geometries and plastic deformation processes while achieving equal or superior load-bearing capacity.
Solution Approach 2:
The patent introduces friction as an intermediary mechanism between the traction means and the connection interface. Instead of relying on direct mechanical interlocking through teeth, the friction force generated by the multi-plane traction arrangement serves as the mediating force that transmits and holds the load, simplifying the manufacturing process.
3Reliability
If multiple traction means on both sides of the plane are used, then the holding force increases significantly, but the device complexity increases
Solution Approach 1:
The patent employs asymmetric positioning of the first and second traction means relative to the reference plane, with each traction means located at optimized distances and orientations. This asymmetric arrangement maximizes the mechanical advantage and frictional contribution of each traction element, achieving high holding force with minimal number of components rather than symmetric redundancy.
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 design significantly increases holding forces between the sash and frame, improving load-bearing capacity while reducing assembly effort and avoiding plastic deformation, making it suitable for higher forces and easier installation.
Implementation Method 1
the holding forces that can be introduced into a sash or into a frame with the aid of the hinge tab according to the invention due to a frictional connection
Data Source
Figure 1
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AI summary
In a hinge leaf (18, 19) of a hinge for the pivotable attachment of a wing to a frame about a hinge axis (S), comprising a fastening part (20) having a first clamping side (21), a clamping element (22) having a second clamping side (23) facing the first clamping side (21), and tension means (24, 25) with which the clamping element (22) can be displaced towards the fastening part (20), at least two tension means (24, 25) are provided spaced apart on both sides from a plane (E) running approximately parallel to the hinge axis (S), and the fastening part (20) has a projecting support projection (26) penetrated by the plane (E) on the first clamping side (21) and/or the clamping element (22) has a projecting support projection (26) on the second clamping side (23).