Fastener Recess and Stabilizer Rib for High-Torque Alignment
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Solution Overview
Problem
Existing fastener systems face issues with driver-recess engagement due to misalignment, debris, and manufacturing inconsistencies, leading to concentrated stresses and potential material failure under high torque loads, resulting in premature disengagement and damage.
Innovation Solution
The design includes a driver-engageable recess with a central core and radiating wings, featuring a groove and tapered inner transition surfaces to stabilize the driver, along with a driver having lobes and stabilizing ribs, which interact with the recess to distribute torque and minimize rocking, thereby enhancing alignment and contact area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If driver-recess engagement is concentrated in small areas or points due to misalignment, then the area of contact is reduced, but the stress concentration increases leading to material failure
Solution Approach 1:
The recess is segmented into multiple wings (typically four) radiating from a central core, with each wing having engagement surfaces that contact corresponding lobes of the driver. This segmentation distributes the contact area across multiple discrete surfaces rather than concentrating it at a single point, thereby reducing stress concentration while maintaining adequate total contact area
Solution Approach 2:
The engagement surfaces on each wing are designed with specific local geometries including tapered surfaces and grooves that optimize contact quality. The grooves in the inner transition surfaces create localized contact zones that ensure proper stress distribution across the driver-recess interface, preventing both excessive concentration and insufficient distribution of stresses
2Stability of the object's composition
If stabilizing features are added to the driver and recess, then alignment stability is improved, but the device complexity increases
Solution Approach 1:
The stabilizing function is merged into the existing wing structure of the recess and driver. The grooves in the inner transition surfaces of the recess and the corresponding stabilizing ribs on the driver lobes are integrated features that provide alignment stability without requiring separate stabilizing components. This merging approach maintains structural simplicity while achieving the desired stability
Solution Approach 2:
The grooves and stabilizing ribs act as intermediary features between the driver and recess that facilitate proper alignment. These features guide the driver into correct positioning within the recess during insertion, mediating the alignment process without requiring complex external alignment mechanisms
Data Source
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AI summary
Fasteners, drivers, punches, fastener systems, and methods of making fasteners, drivers, punches, and fastener systems are disclosed herein. The fasteners, drivers, punches, and fastener systems include, in one example, stabilizing ribs and corresponding recesses.