Slip-proof Union Nut with Axial Recesses
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Solution Overview
Problem
Existing screw connection elements with end-face engagement tools face a high risk of slipping off during tightening and loosening, leading to potential damage and injury, particularly with sharp cutting tools in machine tools.
Innovation Solution
A slip-proof system featuring a union nut with axially parallel recesses on its cylindrical lateral surface and a wrench with cams that insert into these recesses, providing secure engagement and preventing axial slipping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If end-face engagement tools are used for screw connection elements, then the clamping process can be performed, but the risk of tool slipping off increases leading to damage and injury
Solution Approach 1:
The invention transitions from conventional end-face engagement (two-dimensional contact) to lateral surface engagement with axially extending recesses (three-dimensional interlocking). The cams engage with the recesses in the axial direction, creating a secure connection that prevents slipping while maintaining operational ease.
Solution Approach 2:
The invention introduces cams as an intermediary element between the wrench and the screw connection element. These cams fit into the recesses and provide a positive mechanical engagement that transfers force reliably, eliminating the slipping risk associated with direct end-face contact.
2Reliability
If dovetailed cross section grooves and cams are used for slip-proof engagement, then wrench slipping is prevented, but the device complexity increases
Solution Approach 1:
The axially parallel recesses serve multiple functions: they provide the engagement geometry for the cams, define the lateral positioning of the wrench, and maintain structural integrity of the screw connection element. This universal design achieves slip-proof engagement without requiring complex dovetailed cross sections.
Solution Approach 2:
The invention changes the geometric parameters of the engagement structure from radial dovetailed grooves to axial parallel recesses. This parameter change simplifies the manufacturing process while maintaining the slip-proof function, as the axial orientation is more straightforward to produce than radial dovetail geometries.
3Reliability
If additional undercuts are added to end-face cams to prevent slipping, then security against slipping increases, but the manufacturing complexity increases
Solution Approach 1:
The invention extracts the engagement function from the end-face cams and relocates it to the lateral surface recesses. By taking out the complex undercut features from the cams and placing the engagement geometry in the axially oriented recesses, the manufacturing process is simplified while maintaining slip prevention capability.
Data Source
AI summary
The slip-proof system consists of screw connection elements in the form of union nuts having recesses (6, 22) arranged in the lateral surface and of a spanner (11, 25, 30), which is provided with projections (14, 28, 32) engaging into the recesses and is intended for tightening and loosening said screw connection elements.