Threaded Pin and Screw Element Anti-Rotation Fastening
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Solution Overview
Problem
Existing fastening systems for fittings to hollow profiles require additional components or tools to prevent undesired rotation of screw elements during assembly or disassembly, which can be impractical, especially when access is limited.
Innovation Solution
The assembly features a screw element with a bore diameter smaller than the external thread, and specific material and thread geometry selections to achieve a predetermined torque for screwing and unscrewing, ensuring anti-rotation without external tools, using a complementary internal thread and a contact collar for secure engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If circumferential knurling is added to the screw element to prevent rotation, then rotation resistance is improved, but device complexity and manufacturing complexity increase
Solution Approach 1:
The invention changes the geometric parameters of the screw element by creating a bore with diameter smaller than the external thread diameter. This parameter change creates a predetermined torque effect that provides rotation resistance without requiring additional structural features like knurling, thus resolving the contradiction between rotation resistance and device complexity
Solution Approach 2:
The screw element serves itself by using its own geometric configuration (bore diameter smaller than thread diameter) to generate the necessary torque and rotation resistance. This self-service mechanism eliminates the need for additional components or features, resolving the contradiction between rotation resistance and device complexity
2Stability of the object's composition
If a profile wall is used to restrain screw element rotation, then rotation resistance is improved, but ease of operation deteriorates when access is limited
Solution Approach 1:
The screw element provides its own rotation resistance through its geometric design (bore diameter smaller than external thread), eliminating dependence on external components like profile walls. This self-service approach ensures rotation resistance is maintained regardless of accessibility conditions, resolving the contradiction between rotation resistance and ease of operation
Solution Approach 2:
The invention extracts the rotation resistance function from external components (profile wall) and embeds it within the screw element itself through its geometric configuration. This extraction allows the system to maintain rotation resistance without requiring accessible external structures, resolving the contradiction between rotation resistance and ease of operation
3Stability of the object's composition
If additional fastening components are added to prevent rotation, then rotation resistance is improved, but device complexity increases
Solution Approach 1:
The invention merges the rotation resistance function with the screw element itself by using its geometric configuration (bore diameter smaller than external thread). This merging eliminates the need for separate fastening components, resolving the contradiction between rotation resistance and device complexity
Solution Approach 2:
The screw element provides its own rotation resistance through its inherent geometry, serving its own stabilization needs without requiring additional fastening components. This self-service approach resolves the contradiction between rotation resistance and device complexity
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 allows for secure fastening and easy assembly of fittings to hollow profiles with predetermined torque requirements, ensuring the screw element remains locked in place without additional components or tools, enhancing reliability and accessibility.
Implementation Method 1
a predetermined torque is required to screw the screw element onto the threaded pin
Data Source
Figure 1~3
Figure 4~6
AI summary
The subassembly has a threaded pin (1) with an external thread (3) i.e. M8 regular-type screw thread, and a screw-connection element (4) with a hole (7) whose diameter is smaller than external diameter of the thread. Ratio between the diameter of the thread and the diameter of the hole and/or materials selected for the pin and the screw-connection element and/or the geometry of the thread are selected such that a preset torque is necessary for screwing the screw-connection element onto the pin and/or for screwing the pin into the hole in the screw-connection element. An independent claim is also included for a fastening device having a subassembly for fastening a fitting part at a hollow profile.