Alternating Guard and Cutting Elements Grass Trimmer Safety
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Solution Overview
Problem
Existing grass cutting devices pose a risk of accidental injury to users and animals due to their sharp blades, which cannot be completely eliminated while still being effective at cutting grass and other flexible materials.
Innovation Solution
A grass cutting device with a peripheral edge featuring alternating cutting elements and guard elements, where the guard elements are thicker and more projecting than the cutting elements, designed to prevent penetration through skin and reduce injury risk by bending and springing back flexible materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a sharpened blade is used to cut grass effectively, then cutting performance is improved, but the risk of accidental injury to users and animals increases
Solution Approach 1:
The cutting device is segmented into multiple cutting elements (multiple small blades) distributed around the peripheral edge, rather than using a single large blade. This segmentation maintains cutting effectiveness while reducing the harmful impact of any single cutting element, as each small blade has limited capacity to cause serious injury compared to a single large blade.
Solution Approach 2:
The patent introduces an intermediary structure between the cutting elements and potential targets (users/animals) by designing the cutting elements to be small, separate units rather than a continuous sharp edge. This intermediary configuration reduces the direct harmful effect while maintaining the cutting function through the collective action of multiple elements.
2Object-affected harmful factors
If guard elements are added to prevent injury, then safety is improved, but device complexity increases
Solution Approach 1:
The guard elements are merged with the cutting elements into a single integrated assembly. The guard elements are positioned adjacent to the cutting elements along the peripheral edge, forming a unified structure that provides both cutting and protection functions without requiring separate complex safety mechanisms.
Solution Approach 2:
The cutting device structure serves multiple functions: the cutting elements perform the primary cutting function, while the same structural assembly with guard elements simultaneously provides safety protection. This multi-functionality reduces overall device complexity by combining safety features with the cutting mechanism rather than adding separate safety systems.
3Productivity
If multiple cutting elements are arranged along the peripheral edge, then cutting efficiency is improved, but the risk of injury from individual elements increases
Solution Approach 1:
Each cutting element is designed with specific local characteristics - small size and limited protrusion - that reduce its individual harmful potential while maintaining cutting capability. The local quality of each element is optimized to provide sufficient cutting action for efficiency while minimizing the capacity to cause serious injury compared to a single large blade.
Solution Approach 2:
The cutting function is divided into multiple small cutting elements distributed around the peripheral edge. This segmentation reduces the concentrated harmful effect of a single blade while maintaining overall cutting efficiency through the distributed action of multiple elements, each contributing to the cutting process.
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 device effectively cuts grass while minimizing the risk of serious injury to users and animals by using guard elements to absorb impact and prevent penetration, enhancing safety through a combination of design and material selection.
Implementation Method 1
the grass, being flexible, will bend forward then spring up again at the cutting device
Data Source
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AI summary
This invention relates to a grass cutting device (1) which comprises a body equipped with a support (3) for a set of cutting elements (4) which are separate from each other and arranged along a peripheral edge (5) of the support (3) in such a way that they project outwards from it. The grass cutting device also comprises a set of guard elements (6) arranged along said peripheral edge (5) in such a way that between one of the cutting elements (4) and another there is at least one of the guard elements (6). The grass cutting device according to this invention can reduce accidental injuries to the user of the cutting device or other people or animals close to the machinery while it is being used.