Power Tool Motor Switch Coupled to Gearbox
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Solution Overview
Problem
Hand-held power tools require complex and time-consuming gear switching processes, necessitating work process interruptions to change between gear ratios, which is inefficient and inconvenient for operators.
Innovation Solution
A power tool design where the motor switching element is mechanically coupled to the manual transmission, allowing gear switching between at least two ratios without interrupting the work process, using a push-button switch that activates the drive motor and shifts gears after a predetermined adjustment distance, eliminating the need for a separate gear shifting element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate gear selector is provided in addition to the motor switch element, then gear shifting capability is improved, but device complexity and overall dimensions increase
Solution Approach 1:
The patent combines the motor switch element with the gear selector function into a single integrated control mechanism. The motor switch element is mechanically coupled to the transmission system such that actuating it performs both motor activation and gear shifting functions, eliminating the need for a separate gear selector and reducing overall device complexity
Solution Approach 2:
The motor switch element is designed to perform multiple functions: it serves as both the motor on/off switch and the gear selection mechanism. By making this single component universal, the patent reduces the number of separate control elements while maintaining full gear shifting capability
2Adaptability or versatility
If traditional separate gear selector is used, then gear shifting function is provided, but work process must be completely interrupted to shift gears
Solution Approach 1:
The patent enables continuous work process during gear shifting by integrating the gear selection function into the motor switch element. The operator can shift gears without releasing or interrupting the motor activation, allowing the useful action (drilling or screwdriving) to continue uninterrupted while the transmission ratio changes
Solution Approach 2:
The motor switch element is pre-coupled to the transmission shifting mechanism, so that the gear shifting action is prepared and integrated into the motor activation process itself, eliminating the need for separate sequential operations
3Speed
If motor switch element is mechanically coupled to transmission for gear shifting, then gear changing speed is improved, but mechanical complexity of switching mechanism increases
Solution Approach 1:
The patent merges the motor switch element directly with the transmission shifting mechanism through mechanical coupling. This integration allows the same component to control both motor activation and gear selection, achieving rapid gear changes without adding separate complex switching mechanisms
Data Source
Figure 1
AI summary
The invention relates to a power tool, in particular a hand power tool (1), comprising an electric drive motor (2) which may be operated by means of a motor switch element (8) and a gearbox (3) driven by the drive motor (2), with a first and at least one second speed. According to the invention, the motor switch element (8) is coupled to the gearbox (3) such that the same can be switched from the second speed to the first speed by means of the motor switch element (8).