Electric Working Machine Head Unit Resistance Mechanism
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Solution Overview
Problem
Existing electric working machines pose a safety risk as the head unit can inadvertently be sharply bent towards the support rod during operation, potentially catching the operator's hand, due to the lack of effective resistance mechanisms.
Innovation Solution
Incorporating a resistance member between the attachment portion and the head housing, which provides a variable resistance force to prevent sharp bending by changing its magnitude based on the rotation position of the head unit, ensuring both safety and usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the head unit is allowed to rotate freely with respect to the support rod, then the ease of operation is improved, but the safety is worsened due to the risk of sharp bending towards the support rod
Solution Approach 1:
The resistance member provides a resistance force that acts in advance to prevent the head unit from rotating sharply towards the support rod. This preliminary counteracting force stops the harmful motion before it can occur, allowing free rotation in safe directions while blocking the dangerous bending path.
Solution Approach 2:
The resistance member serves as an intermediary element between the head unit and the support rod. It mediates the interaction by providing selective resistance - allowing rotation when safe but preventing sharp bending towards the support rod, thus resolving the contradiction between freedom of movement and safety.
2Object-affected harmful factors
If a resistance member is added to prevent sharp bending, then the safety is improved, but the device complexity increases
Solution Approach 1:
The resistance member is designed as a simple, inexpensive component that can be easily replaced if needed. This allows the use of a relatively simple mechanical element rather than a complex electronic safety system, maintaining safety functionality while minimizing device complexity and cost.
Solution Approach 2:
The resistance member automatically provides the necessary resistance force without requiring external control systems, sensors, or power sources. It self-regulates the rotation based on the mechanical interaction between the head unit and support rod, eliminating the need for complex control mechanisms.
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 resistance member effectively suppresses the sharp bending of the head unit towards the support rod, enhancing operator safety while maintaining usability by adjusting the resistance force as needed, and is designed to be durable without damaging the attachment or head housing.
Implementation Method 1
The resistance member is interposed between the attachment portion and the head housing in a direction perpendicular to the rotation axis. The resistance member is configured to provide a resistance force against rotation of the head unit with respect to the support rod.
Data Source
AI summary
An electric working machine may include a support rod, a head unit, a position fixing mechanism, and a resistance member. The support rod may extend in a front-rear direction and include an attachment portion located at a front end of the support rod. The head unit may include a front tool, a motor configured to drive the front tool, and a head housing supporting the front tool and coupled to the attachment portion rotatably about a rotation axis. The position fixing mechanism may be configured to fix a rotation position of the head unit with respect to the support rod. The resistance member may be interposed between the attachment portion and the head housing with respect to a direction perpendicular to the rotation axis. The resistance member may be configured to provide a resistance force against rotation of the head unit with respect to the support rod.