Reversed-Thread Fastening Nut for Backside Substrate Attachment
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Solution Overview
Problem
Existing fastening devices do not effectively allow for secure attachment of a second substrate to the second face of a first substrate, as they typically engage the second substrate to the first face, and lack reversed external threading and internal threading configurations for enhanced engagement and stability.
Innovation Solution
A fastening device comprising a cylinder with reversed external threading for counterclockwise insertion into a first substrate and an internally threaded channel for clockwise insertion of a threaded fastener, allowing secure engagement of a second substrate to the second face of the first substrate, along with a locking element to prevent loosening due to vibrations and torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fastening devices with standard threading are used, then the device structure is simple, but the device cannot securely attach the second substrate to the second face of the first substrate
Solution Approach 1:
The patent applies reversed external threading on the cylinder portion, allowing counterclockwise rotation for insertion into the first substrate instead of the conventional clockwise threading. This inversion enables the unique function of attaching the second substrate to the second face of the first substrate, resolving the contradiction by sacrificing conventional threading standards to achieve the specific attachment orientation required for reliability.
Solution Approach 2:
The fastening device is segmented into distinct functional portions: a cylinder portion with external threading for substrate engagement, and a channel portion with internal threading for the fastener. This segmentation allows each portion to be optimized for its specific function, with the cylinder providing secure substrate attachment through reversed threading and the channel providing fastener engagement, thereby achieving reliable attachment while maintaining reasonable device complexity.
2Adaptability or versatility
If reversed external threading is implemented for counterclockwise insertion, then the second substrate can be engaged to the second face of the first substrate, but the device complexity increases
Solution Approach 1:
The patent implements reversed external threading on the cylinder portion, enabling counterclockwise rotation for insertion into the first substrate. This inversion provides the adaptability to engage the second substrate to the second face of the first substrate, which would be impossible with conventional threading. The principle is applied specifically to the external threading while the internal channel threading remains conventional, thereby achieving the required versatility with minimal increase in overall device complexity.
3Reliability
If both external and internal threading are present in the same device, then secure engagement is achieved, but the manufacturing complexity increases
Solution Approach 1:
The device is divided into two distinct portions with different threading characteristics: the cylinder portion has external threading for substrate engagement, and the channel portion has internal threading for fastener engagement. This segmentation allows each threading type to be manufactured independently using appropriate processes, reducing the overall manufacturing complexity compared to creating a single complex threading structure. The segmentation enables specialized manufacturing approaches for each portion while achieving the reliability benefits of dual threading.
Solution Approach 2:
The patent applies reversed threading only to the external cylinder portion while keeping the internal channel threading conventional. This selective application of the inversion principle reduces manufacturing complexity by maintaining standard internal threading processes while only modifying the external threading, thereby achieving the required engagement stability with minimal impact on ease of manufacture.
Data Source
AI summary
A fastening nut device for fastening one substrate to another includes a cylinder, which is circumferentially larger proximate to a first end thereof, thus defining a first section and a second section of the cylinder. External threading, which is reversed, is positioned on the second section and extends from a second end of the cylinder. The cylinder can be inserted into a first hole positioned in a first substrate by counterclockwise rotation. The first section of the cylinder abuts a first face of the first substrate and the second end of the cylinder is accessible from a second face of the first substrate. A channel, which is internally threaded, extends into the cylinder from the second end. A threaded fastener, which is engaged to a second substrate, can be inserted by clockwise rotation into the channel to engage the second substrate to the second face of the first substrate.