Flyweight Trimmer Head Mount for Speed-Triggered Line Feed
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Solution Overview
Problem
Traditional trimmer assemblies that utilize manual advancement or bump feeds for trimmer line can cause damage to the power tool and are not desirable.
Innovation Solution
A power tool with an accessory mount device featuring a flyweight mechanism that translates a driven member and spool to advance trimmer line only when a rotational speed threshold is exceeded, using centrifugal forces to control line feeding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual advancement or bump feeds are used to advance trimmer line, then the trimmer line can be advanced, but damage occurs to the power tool
Solution Approach 1:
The system uses the trimmer head's own rotational motion to automatically advance the trimmer line through the flyweight mechanism, eliminating the need for manual bump feeds that cause damage. The flyweight converts rotational speed into linear advancement automatically.
Solution Approach 2:
The patent replaces the manual mechanical bump feed system with a flyweight-based automatic advancement system that uses centrifugal force generated by the rotating trimmer head to advance the line without external manual intervention.
2Productivity
If bump feeds are used to advance trimmer line, then line can be fed, but tangling and jamming increase
Solution Approach 1:
The flyweight mechanism enables continuous, smooth advancement of the trimmer line as the trimmer head rotates, eliminating the intermittent bump feeds that cause tangling. The line advances continuously in sync with the rotational motion.
3Ease of operation
If manual advancement is used, then line can be advanced, but waste increases
Solution Approach 1:
The flyweight mechanism provides automatic feedback based on the trimmer head's rotational speed, advancing the line only when and where needed. This prevents excessive line feeding and waste by synchronizing advancement with actual cutting requirements.
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
The solution mitigates damage to the power tool by controlling trimmer line advancement based on rotational speed, reducing tangling, jamming, and waste, and providing discrete operating ranges for line feeding.
Implementation Method 1
a flyweight including a first flyweight portion configured to translate along the first direction and contact the plate. The flyweight includes a second flyweight portion configured to translate along the second direction. The flyweight is positioned at a hinge between the first flyweight portion and the second flyweight portion and is configured to rotate along the hinge to push the first flyweight portion to the plate and translate the plate and the driven member along the first direction toward the first end when a rotational speed threshold about the first axis is exceeded.
Data Source
AI summary
A power tool and an accessory mount device are provided. The device includes a driven member, a plate, and a flyweight comprising a first flyweight portion configured to translate along the first direction and contact the plate. The flyweight includes a second flyweight portion configured to translate along the second direction. The flyweight is positioned at a hinge between the first flyweight portion and the second flyweight portion and is configured to rotate along the hinge to push the first flyweight portion to the plate and translate the plate and the driven member along the first direction toward the first end when a rotational speed threshold about the first axis is exceeded.