Threaded Fastener Head Markings for Tightening Specification Recall
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Solution Overview
Problem
Current databases for threaded mechanical fasteners lack essential 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 missing information on rotation direction, thread locking compounds, and critical tightening sequences.
Innovation Solution
A system that stores and recalls tightening specifications on threaded fasteners using debossed patterns on the fastener head, readable by both humans and machines, allowing for automatic decoding and tool configuration, including the use of optical scanners and microprocessors within torque tools to ensure correct torque application and alert technicians to special requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If comprehensive tightening specifications are noted on fabrication drawings for initial assembly, then complete information is available for initial assembly, but information is omitted for maintenance and repair databases
Solution Approach 1:
The patent segments the fastener head surface into multiple zones, each containing specific tightening specification information. This allows different types of information (torque values, thread direction, locking compound indicators, sequence numbers) to be organized in distinct areas, making the information both complete and easily readable for different maintenance scenarios.
Solution Approach 2:
The tightening specifications are pre-marked on the fastener head during manufacturing, before the fastener is ever installed or removed. This preliminary action ensures that all necessary information is permanently attached to the fastener itself, eliminating the need for separate databases or documentation during maintenance and repair operations.
2Productivity
If repair technicians rely on incomplete databases, then maintenance operations proceed quickly, but errors occur such as incorrect fastener reuse, misinterpretation of thread direction, and improper torque application
Solution Approach 1:
The fastener itself provides the information it needs through the markings on its head. The technician simply needs to read the markings on the fastener to obtain all tightening specifications, eliminating the need to search external databases. This self-service approach ensures complete and accurate information is always available, preventing errors while maintaining operational efficiency.
3Duration of action of stationary object
If threading specifications are stored on the fastener head, then information is permanently available, but the fastener head surface area is limited
Solution Approach 1:
The patent applies different marking styles and densities to different areas of the fastener head based on the type of information being conveyed. Critical information like torque values uses larger, more spaced-out markings, while secondary information uses smaller, denser markings. This local quality approach optimizes the use of limited surface area while ensuring all information remains permanently attached and readable throughout the fastener's service life.
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.