Telescopic Rod Detection for Electric Pruner Safety
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Solution Overview
Problem
Existing electric bush cutters have a fixed rod length, making them rigid and difficult to store compactly, and lack a detection system for the extending state of the rod, which can lead to unsafe operation and sudden motor start-ups when the rod is extended.
Innovation Solution
An electric working machine with a contracting rod and a detection unit that ensures the rod is fully extended before allowing motor operation, featuring a control unit that prevents motor rotation when the rod is not extended and improves wiring from the detection unit to the control unit for enhanced safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the rod length is made constant to achieve rigidity, then the structural stability is improved, but the storage compactness deteriorates
Solution Approach 1:
The rod is divided into multiple telescopic sections that can slide relative to each other, allowing the rod to be extended to a long length for work and retracted to a short length for storage, thus resolving the contradiction between structural stability and storage compactness
Solution Approach 2:
The rod transitions from a static fixed length to a dynamic adjustable length through telescopic sections, enabling the rod to adapt between extended and retracted states to satisfy both operational stability and storage compactness requirements
2Volume of moving object
If the rod is made telescopic to reduce storage size, then the storage compactness is improved, but the structural stability deteriorates
Solution Approach 1:
The rod is segmented into telescopic sections with locking mechanisms that maintain structural stability when extended and allow compact retraction when not in use, balancing storage compactness with operational stability
Solution Approach 2:
The detection unit detects the rod extension state before allowing motor operation, and the control unit pre-prevents motor rotation when the rod is not fully extended, ensuring safety before operation begins
3Device complexity
If no detection unit is provided to simplify the system, then the device complexity is reduced, but the operational safety deteriorates
Solution Approach 1:
The detection unit provides real-time feedback on the rod extension state to the control unit, which then controls motor rotation accordingly, creating a closed-loop safety system that prevents operation when the rod is not properly extended
Data Source
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AI summary
An electric working machine (1) including: a motor; a control unit configured to control rotation of the motor; a fixed part (3) provided with a handle having a grip portion (43); a movable part (4) held by the fixed part (3) and is configured to be extendible by sliding relative to the fixed part (3); and a cutting blade (155) provided to a end portion of the movable part (4) and is configured to be driven by the motor; characterized in that the electric working machine (1) further includes a detection unit which is connected to the control unit and is configured to detect whether or not the movable part (4) is positioned at a predetermined extended position relative to the fixed part (3).