T-Nut Neck Geometry for Flush, Oscillation-Resistant Fastening
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Solution Overview
Problem
Existing T-Nuts fail to sit flush with surfaces due to constant diameter barrels, leading to oscillation and loosening, especially when used with materials like plastic, as they cannot securely engage with cylindrical casings and protrusions, resulting in a less secure connection.
Innovation Solution
A T-Nut design featuring a tubular body with a constant bottom diameter and an upper neck portion that tapers to a larger diameter, creating an interference fit when inserted, and a recessed flange head to envelope protrusions, ensuring a secure and flush fit within the casing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a T-Nut has a constant diameter barrel, then it is easy to manufacture, but it oscillates up and down within the pre-drilled hole or casing leading to loosening
Solution Approach 1:
The patent applies parameter changes by modifying the barrel diameter from constant to variable. The barrel transitions from a smaller diameter at the bottom to a larger diameter at the top, creating an interference fit with the casing. This dimensional parameter change allows the T-Nut to securely engage with the casing walls, preventing oscillation and loosening while maintaining manufacturability through standard machining processes.
2Adaptability or versatility
If the hole is lined with a cylindrical casing with rounded edges, then plastic or composite materials can be joined, but the T-Nut cannot sit flush with the surface of the material
Solution Approach 1:
The patent applies local quality by creating a recessed bottom surface localized at the base of the T-Nut. This recessed area specifically accommodates the rounded edges of the cylindrical casing, allowing the T-Nut to sit flush with the material surface. The rest of the T-Nut structure maintains its standard geometry for fastening functionality, thus achieving both material compatibility and flush fit.
3Reliability
If the T-Nut is pulled into the drill-hole or casing during tightening, then connection security improves, but vertical oscillation occurs during the tightening process
Solution Approach 1:
The patent applies preliminary action by designing the barrel with a tapered geometry that guides the T-Nut into proper alignment and position within the casing before the final tightening occurs. The smaller bottom diameter allows initial insertion and centering, while the expanding upper diameter progressively engages the casing walls, preventing vertical oscillation during the tightening process and ensuring stable connection security.
Data Source
AI summary
A T-Nut comprising a tubular body attached to a flanged head is provided. The tubular body includes a bottom portion of constant diameter and an upper neck portion with a neck diameter that gradually increases as it approaches the flange head. Additionally, the bottom surface of flange head of the T-Nut may be recessed inwardly towards the top surface of the flange head to create circumferential concave cavity underneath the flange head, which will allow the flange head to envelope any portions of a washer or casing that may be above the surface of the material being joined.