Grass Cutting Head with Radial Blade and Line Mechanism
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Solution Overview
Problem
Existing grass cutting heads are inefficient and unsafe as they either require users to handle cutting blades during line elongation or have poorly designed mechanisms that increase the risk of accidents and inefficiencies in cutting vegetation.
Innovation Solution
A line-type grass cutting head with a housing that incorporates a cutting line spool and an elongation mechanism, along with a rigidly fastened cutting blade that rotates with the head, allowing safe elongation of the cutting line without exposing the user to blade areas, and features a dome-shaped housing with annular cutting blades for improved efficiency and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the cutting line elongation mechanism is positioned below the cutting blades, then the blade mounting mechanism can be integrated, but the user must handle the cutting blades during line elongation which increases safety risks
Solution Approach 1:
The patent repositions the cutting line elongation mechanism from the axial direction (below the blades) to the radial direction (at the side of the housing). This dimensional change allows the elongation button to be accessible from the side rather than requiring the user to reach below the rotating blades, thereby maintaining mechanism integration while eliminating the safety hazard of handling blades during line replacement
2Ease of operation
If cutting blades are pivotally mounted on the grass cutting head, then the blades can be easily installed and removed, but the structure becomes more complex and less stable
Solution Approach 1:
The patent divides the blade mounting system into separate components: a blade holder that is pivotally mounted to the housing, and cutting blades that are detachably mounted to the holder. This segmentation allows the holder to provide the pivoting function for easy installation/removal while the blades remain securely fixed during operation, reducing overall structural complexity compared to fully pivotal blade mounting
3Device complexity
If the cutting line housing is positioned far from the ground to accommodate the blade mounting mechanism, then the blades can be mounted, but the cutting line is arranged at a large distance from the ground reducing cutting efficiency
Solution Approach 1:
The patent repositions both the cutting line elongation mechanism and the cutting blades from an axial arrangement (where the line would be far from ground) to a radial arrangement. The cutting line now projects horizontally from the side of the housing rather than extending downward, allowing the line to be positioned closer to ground level and improving cutting efficiency while maintaining full blade mounting functionality
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 enables safe and efficient cutting of vegetation by allowing line elongation without touching blade areas, enhancing user safety and operational efficiency compared to prior art designs.
Implementation Method 1
when the head rotates at high speed around its rotation axis, driven by the bush cutter drive shaft, the ends are tensioned due to the effect of the centrifugal force
Data Source
AI summary
The grass cutting head (1), configured for rotation around a rotation axis, comprises a housing (3) for a cutting line (F); a space (5) inside the housing for winding a stock of cutting line; at least one hole (3B) in a side wall (3A) of the housing (3), through which the cutting line (F) passes from the inner space (5) towards the outside of the housing; At least one cutting blade (21) with at least one cutting edge (23) is associated with the housing (3) of the grass cutting head (1).