Trimmer Accessory Mount With Flyweight Line Feed Control
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Solution Overview
Problem
Traditional trimmer line advancement methods, such as manual bump feeds, can cause damage to power tools and are not desirable.
Innovation Solution
A power tool with 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 bump feed is used to advance trimmer line, then 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 and centrifugal force to automatically advance the trimmer line without requiring manual bumping operations. The flyweight mechanism converts rotational kinetic energy into linear motion to feed the line, making the system self-sufficient and eliminating harmful manual intervention
Solution Approach 2:
The patent replaces the manual mechanical bump-feed mechanism with an automated centrifugal force-based system. The flyweight and spring mechanism substitute for manual operator input, using the natural rotational energy of the trimmer head to drive line advancement through controlled mechanical interaction
2Ease of operation
If traditional bump feed method is used, then trimmer line can be advanced, but tangling and jamming occur
Solution Approach 1:
The system dynamically controls line advancement based on the rotational speed of the trimmer head. The flyweight mechanism responds to changes in centrifugal force during rotation, automatically adjusting line feed timing and amount to prevent tangling and jamming while maintaining smooth operation throughout the rotational cycle
Solution Approach 2:
The flyweight mechanism provides inherent feedback based on rotational speed and centrifugal force. As the trimmer head rotates faster, the flyweight moves to advance more line; as speed decreases, the spring returns the flyweight to prevent excessive line feed, creating a self-regulating system that prevents tangling and jamming
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
Mitigates damage to the power tool by controlling trimmer line advancement through discrete speed ranges, reducing tangling and jamming, and improving durability.
Implementation Method 1
The flyweight 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.