Threaded Fastener Head Markings for Torque Specification Recall
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Solution Overview
Problem
Current databases and tools for threaded mechanical fasteners lack comprehensive information on tightening specifications, leading to errors during maintenance and repair, such as incorrect fastener reuse, misinterpretation of thread direction, and improper torque application, due to incomplete or obscured markings on fasteners.
Innovation Solution
A system that stores and recalls tightening specifications on threaded fasteners using debossed patterns, which can be read manually or electronically, providing essential information like torque requirements, thread direction, and thread locking presence, and is integrated into torque tools for automated control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If comprehensive tightening specifications are stored on fasteners, then information completeness is improved, but fastener complexity increases
Solution Approach 1:
The patent uses debossed patterns that create visual contrast through light reflection differences. The debossed markings form light and dark regions that can be easily distinguished, providing clear visual information without adding physical complexity to the fastener structure.
Solution Approach 2:
The patent encodes tightening specifications in a two-dimensional debossed pattern on the fastener head surface. This allows comprehensive information storage in a compact format that doesn't increase the fastener's dimensional complexity, fitting within the existing fastener geometry.
2Difficulty of detecting and measuring
If debossed patterns are used for storage, then readability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent replaces complex multi-step marking processes with a single debossing operation. The debossed pattern is created through mechanical deformation of the fastener head surface during or after forming, eliminating the need for separate marking steps and reducing manufacturing complexity.
Solution Approach 2:
The debossed pattern is incorporated into the fastener manufacturing process itself, creating the information storage feature as part of the base forming operation. This preliminary integration means the marking is created alongside the fastener structure rather than as a separate post-processing step.
3Manufacturing precision
If automated tool control is implemented, then tightening accuracy is improved, but system complexity increases
Solution Approach 1:
The patent implements a feedback system where the optical scanner reads the debossed pattern on the fastener, the controller decodes the tightening specifications, and the controlled tool applies the exact torque required. This closed-loop feedback ensures accurate torque application while automating the process.
Solution Approach 2:
The patent introduces an optical scanner and controller as intermediaries between the fastener information and the torque tool. These components translate the debossed pattern into actionable torque commands, enabling automated control without requiring direct complex integration between the fastener and tool.
4Loss of information
If multiple tightening specifications are stored, then information completeness is improved, but storage space requirements increase
Solution Approach 1:
The patent encodes multiple tightening specification parameters (torque value, thread direction, locking presence, sequence information) into a compact debossed pattern using variations in dot presence, position, and arrangement. This efficient encoding allows comprehensive information storage in a minimal surface area.
Solution Approach 2:
The patent uses a two-dimensional array of debossed dots to encode multiple specification parameters simultaneously. By utilizing spatial arrangement and presence/absence patterns in the debossed matrix, the system stores comprehensive tightening information without requiring proportional increases in surface area.
Data Source
AI summary
A surface marked threaded fastener comprising an elongated and threaded shaft and a head at one end of the elongated and threaded shaft; said head comprising on a surface contacting face a readable matrix comprising a dot pattern, said dot pattern defining a tightening specification.