Deformed Nail Shank Geometry for Higher Pull-Out Resistance
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Solution Overview
Problem
Conventional nails lack sufficient grip strength and pull-out resistance compared to screws and other shank designs, necessitating improved shank designs for enhanced performance in construction and woodworking applications.
Innovation Solution
The introduction of a nail design featuring a plurality of deformations with frustoconical portions and optional helical flutes, which increase grip strength and pull-out resistance by providing a larger diameter at one end and a smaller diameter at the other, and incorporating transition portions for enhanced engagement with the material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If smooth shank nails are used, then ease of installation and speed of installation are improved, but grip strength and pull-out resistance deteriorate
Solution Approach 1:
The nail shank features localized deformations (ring shanks, screw shanks, or barbed configurations) at specific intervals along its length, while maintaining a smooth surface in other areas. This local quality approach provides enhanced grip strength at deformation points while preserving the overall smooth shank structure for easy installation with nail guns.
Solution Approach 2:
The shank is segmented into multiple deformation zones rather than being uniformly smooth or uniformly deformed. Each deformation segment (ring, screw thread, or barb) acts as an independent grip-enhancing feature, allowing the nail to maintain both installation speed and improved pull-out resistance.
2Strength
If screw shank nails are used, then pull-out resistance is improved, but driving force requirement increases
Solution Approach 1:
The screw shank deformations are designed to engage progressively rather than all at once. During driving, only the leading deformations are actively engaged, reducing the instantaneous driving force requirement while still providing high pull-out resistance once fully installed.
Solution Approach 2:
The deformations are pre-configured to self-engage as the nail is driven into the material. The geometry of screw threads and barbs is designed to automatically catch and hold wood fibers during the driving process, reducing the force needed compared to smooth shanks that require post-installation fastening.
Data Source
AI summary
A fastener with increased grip strength is provided. Specifically, the fastener can include a head on a first end, a point on a second end opposite from the first end, and a shank in between the head and the point. A plurality of first deformations can be provided each including a first frustoconical portion and a first transition portion. One or more flutes can further be provided that extends from the point through the plurality of the first deformations forming one or more continuous helices. A plurality of second deformations can also be provided each including a second frustoconical portion and a second transition portion. The second deformations can be structurally similar to the first deformations, but having their orientations flipped 180 degrees. The fastener can also include one or more weld spaces for a collated configuration.