Hand-Held Power Tool Actuating Rod and Clutch Mechanism
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Solution Overview
Problem
Existing hand-held power tools, such as screwdrivers, face challenges in securely and reliably activating the drive motor when transitioning between decoupling and coupling positions, particularly due to the complexity of actuating the motor switch and clutch engagement.
Innovation Solution
A hand-held power tool design featuring a clutch with a first and second clutch part that engage/disengage along the rotational axis, an actuating rod guided along the housing for motor switch activation, and a slide decoupled from the tool holder via a bearing element for easy rotation, enabling secure motor activation and auto-start functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the actuating rod is directly connected to the tool holder, then the motor activation is simple, but the motor cannot be reliably activated in the decoupling position
Solution Approach 1:
The slide acts as an intermediary element between the tool holder and the actuating rod. It is decoupled from the tool holder via a bearing element, allowing it to move independently. When the tool holder is loaded against a workpiece, the slide moves along with it and transfers this movement to the actuating rod, which then activates the motor switch. This intermediary mechanism ensures reliable motor activation in both coupling and decoupling positions without directly connecting the actuating rod to the tool holder.
2Ease of operation
If the slide is rigidly connected to the tool holder, then the structure is simple, but the slide cannot be easily decoupled for rotation
Solution Approach 1:
The connection between the slide and tool holder is made dynamic through the bearing element. Instead of a rigid fixed connection, the bearing element allows the slide to rotate relative to the tool holder while maintaining a functional connection. This dynamic connection enables easy decoupling for rotation when needed, while maintaining structural simplicity during normal operation.
3Extent of automation
If the clutch parts are always engaged, then the power transmission is continuous, but the auto-start mode cannot be activated
Solution Approach 1:
The clutch mechanism is designed to be dynamically switchable between engaged and disengaged states. The first and second clutch parts can be engaged to transmit power continuously during normal operation, or disengaged to allow the tool holder to be loaded against a workpiece without continuous power transmission. This dynamic capability enables the auto-start mode to be activated when needed, while maintaining continuous power transmission when required.
Data Source
AI summary
A hand-held power tool includes a tool holder, a housing in which a drive motor configured to drive an output shaft is arranged, the output shaft arranged spaced apart from the tool holder in a decoupling position of the tool holder, and a clutch configured to operatively connect the output shaft to the tool holder in a coupling position of the tool holder by way of a loading of the tool holder along a rotational axis of the drive motor against a workpiece to be worked on. An actuating rod is configured to be loaded against a motor switch in the coupling position to activate the drive motor, the motor switch arranged along the rotational axis of the drive motor between the drive motor and the clutch, wherein the actuating rod is guided by the housing at least in regions.