Multi-directional Blade Guard with Movable Grass Combs
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Solution Overview
Problem
Conventional blade guards for robotic garden tools are designed for mowing in a single direction, limiting their effectiveness when the tool travels in multiple directions, as they do not accommodate the changing orientation and direction of the cutting blade efficiently.
Innovation Solution
A blade guard with a base plate and ribs that define a volume to house the cutting blade, allowing it to rotate freely while protecting it from debris and users, and featuring grass combs and bumpers that facilitate cutting in both forward and rearward directions by positioning them upstream of the blade regardless of direction, ensuring even cutting and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional blade guard is designed for single-direction mowing, then the structure is simple and easy to manufacture, but it cannot accommodate multi-directional cutting effectively
Solution Approach 1:
The blade guard incorporates movable grass combs that can dynamically adjust their position based on the direction of travel. The combs are mounted on sliding rails or pivots, allowing them to move forward or backward to position the cutting blade upstream relative to the direction of motion, enabling effective cutting in both forward and reverse directions without requiring a completely different guard structure.
Solution Approach 2:
The blade guard is divided into separate functional segments: a fixed base plate providing structural support, movable grass combs for directional adaptation, and a protective housing. This segmentation allows the movable components to adjust for multi-directional operation while the fixed base maintains structural integrity and simplifies manufacturing of individual parts.
2Adaptability or versatility
If the blade guard structure is made more complex to accommodate multi-directional cutting, then adaptability improves, but manufacturing difficulty and cost increase
Solution Approach 1:
The movable grass combs use simple mechanical mechanisms such as sliding rails, pivots, or spring-loaded mounts that can be manufactured using standard machining processes. These dynamic components require minimal complexity while achieving the desired multi-directional adaptability, balancing manufacturing ease with functional versatility.
Solution Approach 2:
The blade guard structure is designed as a universal platform that can handle both forward and reverse cutting through the movable comb mechanism. The fixed base plate and housing serve multiple functions: structural support, blade containment, and mounting for the adjustable combs, reducing the need for separate components for different cutting directions and simplifying overall manufacturing.
3Productivity
If grass combs are positioned fixedly, then the structure is stable and easy to manufacture, but cutting performance deteriorates when changing direction
Solution Approach 1:
The grass combs are mounted on movable mechanisms that allow them to shift position when the direction of travel changes. This dynamic positioning ensures the combs consistently guide vegetation into the cutting blade from the upstream side, maintaining high cutting efficiency in both forward and reverse directions without requiring complex control systems.
4Object-affected harmful factors
If the blade guard provides extensive protection, then safety improves, but access for maintenance and blade replacement becomes difficult
Solution Approach 1:
The blade guard is segmented into a fixed protective housing and movable internal components. The housing provides comprehensive safety protection, while the movable grass combs and modular blade assembly can be independently accessed and adjusted. This segmentation maintains safety while facilitating easy maintenance through straightforward access points.
Data Source
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AI summary
A robotic garden tool including a body having a first end and a second end opposite the first end, one or more wheels rotatably coupled to the body, and a cutting assembly coupled to the body. The robotic garden tool also includes a first grass comb positioned between the cutting assembly and the first end, and a second grass comb positioned between the cutting assembly and the second end.