Hinge Part With Concealed Screws For Displacement Prevention
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Solution Overview
Problem
The existing hinge technologies lack a strong and reliable connection between the fastening part and the outer part, which can lead to displacement under heavy loads, such as in doors or windows, due to reliance on frictional connections that are not sufficient to prevent movement by gravity.
Innovation Solution
A form-fitting connection is achieved by using a connecting screw with a core diameter matching the cavity formed by the recesses, featuring an internal thread that is cut by the screw's external thread, providing a secure and strong attachment that prevents axial displacement and allows for continuous cross-section manufacturing for cost-effective production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a frictional connection using a clamping rod is used to connect the fastening part and outer part, then the device complexity is reduced, but the connection strength and reliability deteriorate under heavy loads
Solution Approach 1:
A connecting screw is introduced as an intermediary element between the fastening part and outer part. The screw thread engages with threaded bores in both components, creating a positive mechanical connection that prevents relative displacement. This mediator transforms the weak frictional connection into a strong threaded connection while maintaining structural simplicity.
Solution Approach 2:
Threaded bores are pre-formed in both the fastening part and outer part before assembly. This preliminary action enables the connecting screw to create an immediate positive connection upon insertion, eliminating the need for complex assembly procedures and ensuring reliable load-bearing capacity from the start.
2Ease of manufacture
If the outer part has a discontinuous cross-section to accommodate the clamping rod recess, then the connection function is achieved, but the manufacturing cost and production complexity increase
Solution Approach 1:
The connection function is segmented between multiple elements: threaded bores in the outer part, threaded bores in the fastening part, and the connecting screw. This segmentation allows each component to maintain a continuous, simple cross-section suitable for extrusion manufacturing, while collectively achieving the connection function without requiring discontinuities in the outer part.
3Reliability
If a form-fitting connection with a connecting screw is used, then the connection strength and reliability are improved, but the device complexity increases
Solution Approach 1:
The connecting screw combines multiple functions into a single element: it creates the positive mechanical connection through thread engagement, provides clamping force to secure the joint, and prevents relative displacement between components. This merging achieves high reliability without requiring multiple separate fastening elements or complex assembly mechanisms.
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 form-fitting connection using a connecting screw enhances the strength and reliability of the hinge, preventing displacement even under heavy loads, while allowing for cost-effective and attractive manufacturing of the hinge parts with continuous cross-sections, ensuring secure fixation and ease of assembly.
Implementation Method 1
The external thread of the connecting screw engages in the internal thread in the walls of the recesses in the fastening part and in the outer part, resulting in a form-fitting connection between the fastening part and the outer part
Implementation Method 2
The thread turn of the internal thread can also be cut through a self-tapping external thread of the connecting screw
Data Source
Figure 1~3
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Figure 5
AI summary
The belt unit comprises an elongated fastening unit (9) which has a screw hole (12) for receiving a clamping screw (2). An outer part (10) has an elongated recess (20), where the fastening unit has a connecting surface (14). The outer part has another connecting surface (25), where an oblong recess is arranged in an area of each connecting surface. A connecting screw (30) is screwed in an oblong hollow space, where an outer threading of the connecting screw, is engaged in an inner threading at a wall of the hollow space. The outer part is made of aluminum. An independent claim is also included for a hinge belt for doors or windows.