Power Screwdriver Bit Magazine With Single-Switch Loading
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Solution Overview
Problem
Existing hand-held power tools with insert tool magazines require complex and unintuitive operations for activating the drive motor and displacing insert tools, making them cumbersome to use.
Innovation Solution
A manual switch that can be actuated to both activate the drive motor and load a selected insert tool into the tool receiving area, utilizing a loading device with a lever arm, slider, and locking element for secure displacement, and a rotatable insert tool magazine for easy selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate controls are provided for activating the drive motor and displacing insert tools, then reliable control of each function is achieved, but the device complexity and ease of operation deteriorate due to multiple controls
Solution Approach 1:
The patent combines the drive motor activation function and the insert tool displacement function into a single manual switch. The manual switch has multiple positions (first position for tool displacement, second position for drive motor activation) that allow both functions to be controlled through one unified control element, thereby reducing the number of separate controls while maintaining reliable control of each function.
Solution Approach 2:
The manual switch is designed as a multifunctional control element that performs two distinct functions: displacing insert tools from the magazine to the tool receiving area, and activating the drive motor. This universal control element eliminates the need for separate controls, simplifying the device while ensuring reliable control through a single interface.
2Ease of operation
If a multifunctional manual switch is used to control both drive motor activation and insert tool displacement, then ease of operation improves, but the device complexity increases due to the loading device mechanism
Solution Approach 1:
The loading device mechanism is nested within the housing structure of the power tool. The lever arm, loading element, and associated components are integrated into the existing housing and magazine assembly, allowing the multifunctional control mechanism to be accommodated without significantly increasing the overall device complexity or external dimensions.
Solution Approach 2:
The manual switch acts as an intermediary element that translates user input into two different mechanical actions depending on its position. In the first position, it activates the loading device to displace tools; in the second position, it directly activates the drive motor. This intermediary control mechanism simplifies user interaction while managing the complexity of the underlying mechanisms.
3Ease of operation
If the loading element is freely movable for tool displacement, then ease of operation improves, but reliability deteriorates due to potential unintentional movement
Solution Approach 1:
The locking element is designed to prevent unintentional movement of the loading element by engaging with it in the locked position. This preliminary protective measure ensures that the loading element can only move when the user intentionally actuates the manual switch, thereby maintaining reliability while allowing ease of operation during intended use.
Solution Approach 2:
The locking element automatically engages with the loading element when the manual switch is actuated to the first position, securing the loading element in its moved position before the user releases the switch. This preliminary locking action prevents any potential unintentional movement or premature return, ensuring reliable positioning while maintaining operational convenience.
Data Source
AI summary
A hand-held power tool, in particular a power screwdriver, includes a housing in which at least one drive motor is arranged for driving a tool receiving area. The drive motor can be activated via a manual switch, and the tool receiving area is designed to receive an insert tool. The hand-held power tool also includes an insert tool magazine for storing a plurality of selectable insert tools. The manual switch can be actuated in order to load a selected insert tool arranged in the insert tool magazine in the axial direction of the drive motor from the insert tool magazine into the tool receiving area and in order to activate the drive motor.