Chain Saw Electrical Brake via Clutch Detection
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Solution Overview
Problem
Existing chain saws require cumbersome operation to activate the brake mechanism, which involves moving the hand guard and returning the trigger, and lack an independent electrical brake system for enhanced safety and operability.
Innovation Solution
A chain saw design incorporating a motor-driven clutch mechanism with a clutch state detection unit that automatically activates an electrical brake when overload occurs, independent of hand guard operation, and includes both mechanical and electrical brake systems for improved safety and operability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical brake actuated by hand guard operation is used, then the chain blade rotation can be stopped, but the operation becomes cumbersome requiring simultaneous movement of hand guard and trigger
Solution Approach 1:
The patent replaces the mechanical brake system actuated by hand guard movement with an electrical brake system controlled by a trigger switch. This substitution eliminates the need for complex hand guard manipulation while maintaining reliable brake activation through a simpler electrical control mechanism.
Solution Approach 2:
The electrical brake system automatically activates when the trigger is released, without requiring additional manual operations. The system serves itself by using the natural release of the trigger to initiate braking, reducing operational complexity while maintaining reliability.
2Device complexity
If only a mechanical brake system is used, then the structure remains simple, but safety is reduced when the mechanical brake fails or is not operated
Solution Approach 1:
The patent implements two independent brake systems with different mechanisms and control methods. The mechanical brake provides one mode of operation while the electrical brake provides another, allowing the system to maintain safety through redundancy while keeping each individual brake system relatively simple in structure.
Solution Approach 2:
The electrical brake system serves as a preparatory safety measure that can activate independently if the mechanical brake system fails or is not properly operated. This redundant system cushions against potential failures, ensuring safety is maintained even when one system does not function as intended.
3Ease of operation
If the brake is actuated by hand guard movement, then a brake mechanism can be implemented, but the operation requires moving hand guard and returning trigger simultaneously which is cumbersome
Solution Approach 1:
The patent replaces the mechanical hand guard operation with an electrical trigger switch control system. This substitution dramatically reduces the time and complexity of brake activation, as the electrical system responds instantly to trigger release without requiring coordinated manual movements of multiple components.
Data Source
AI summary
A chain saw includes: a motor driven by electric power; a housing configured to accommodate the motor; a guide bar attached to the housing; a chain blade wound around the guide bar; a sprocket engaged with the chain blade to drive the chain blade, wherein the chain saw is configured to transmit a driving force of the motor to the sprocket via a clutch mechanism, wherein the chain saw comprises a shut-off switch for detecting an actuation of the clutch mechanism and is configured such that the power supply to the motor is stopped when the actuation of the clutch mechanism is detected by the shut-off switch so as to brake electrically. The electrical brake is provided together with a mechanical brake that is configured to work when a hand guard is rotated.