Laser-Etched Screwdriver Tip for Higher Torque Without Camout
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Solution Overview
Problem
Existing laser-etched screwdriver tips often result in melted zones and convex geometries due to high-power laser methods, leading to less effective engagement with screw heads and potential camming out issues.
Innovation Solution
The use of a low-power laser to form multiple passes over a workpiece engaging surface, creating narrow, parallel channels and serrated teeth, along with a crosshatch pattern to enhance torque application without camming out, by spacing channels closely and forming groupings with varying depths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-power laser methods are used to etch screwdriver tips, then etching speed and productivity are improved, but melted zones and convex geometries are created that reduce engagement effectiveness
Solution Approach 1:
The patent changes the laser power parameter from high-power to low-power mode, and adjusts the number of passes parameter to multiple passes. This parameter transformation allows the laser to etch narrow channels without creating melted zones or convex geometries, resolving the contradiction between etching speed and engagement reliability by finding an optimal parameter combination that prioritizes quality over raw speed.
Solution Approach 2:
The patent employs periodic action by making multiple passes (e.g., 3-5 passes) of the low-power laser over the workpiece surface. Each pass gradually removes material to form the desired channel geometry. This periodic, incremental approach prevents heat accumulation that would cause melting, while still achieving the required etching depth and maintaining reliable screw head engagement.
2Force
If channels are spaced closely together to form serrated teeth, then torque application is enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The patent replaces traditional mechanical machining methods with laser etching technology. The laser beam can be precisely controlled through software to maintain consistent spacing between channels, eliminating the need for complex mechanical positioning systems. This substitution enables close channel spacing for enhanced torque application while maintaining manufacturing precision through digital control rather than mechanical tolerances.
Solution Approach 2:
The patent uses a predetermined pattern design that is replicated across the screwdriver tip surface through the laser etching process. The channel spacing and geometry are defined by a digital pattern that ensures consistent, precise spacing between all channels. This copying approach maintains manufacturing precision while enabling the close spacing needed for effective serrated teeth formation and torque application.
3Reliability
If multiple laser passes are used to form narrow channels, then engagement effectiveness is improved, but processing time increases
Solution Approach 1:
The patent transforms the laser power parameter from high to low, and adjusts the number of passes parameter to optimize the balance between engagement effectiveness and processing time. The low-power, multi-pass approach creates narrow, clean channels that provide effective engagement without the melted zones caused by high-power lasers. While multiple passes increase processing time compared to a single high-power pass, the overall time is reduced by eliminating the need for post-processing and rework.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach results in improved screw head engagement, allowing higher torque application without camming out, with average camout torque values exceeding those of unetched and high-power laser-etched tips, demonstrating enhanced tool efficiency.
Implementation Method 1
a low-power laser is used to form multiple passes over a workpiece engaging surface, creating narrow, parallel channels and serrated teeth
Data Source
AI summary
A workpiece engaging surface that includes a pattern of laser-etched channels and related method of manufacturing is provided. The laser-etched pattern on the surface of the workpiece engaging surface is formed by multiple groupings of closely spaced channels that generate serrated teeth in the surface of the tip. Each grouping of channels is formed by passing a laser over a first location a first number of passes to form a first channel, passing a laser over a second location, spaced apart from the first location by a channel spacing distance, a second number of passes to form a second channel, and passing a laser over a third location, spaced apart from the second location by the channel spacing distance, a third number of passes to form a third channel. In some embodiments the first, second, and third number of passes are the same.