Handheld Power Tool Gearbox Fixing Device
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Solution Overview
Problem
Hand-held power tools experience instability due to unintentional shifting of locking devices in their transmission systems, leading to unpredictable torque transmission and direction changes.
Innovation Solution
A fixing device is introduced to securely lock the locking devices in their respective switching positions, preventing unintentional shifts and ensuring stable operation by using mechanisms like latching devices, clamping devices, magnet arrangements, or spring-loaded elements to maintain the blocking direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If locking devices are made switchable to change blocking direction, then adaptability is improved, but stability deteriorates due to unintentional shifting
Solution Approach 1:
The fixing device is activated before the locking device can unintentionally shift, preventing the instability from occurring. The fixing mechanism engages in advance to secure the locking device in its current position, ensuring that any subsequent movements or vibrations cannot cause unintended switching of the blocking direction.
Solution Approach 2:
The fixing device acts as an intermediary between the locking device and the external environment, isolating the locking device from forces that could cause unintentional shifting. This intermediate fixing mechanism ensures that the locking device remains stable while still allowing controlled switching when needed.
2Stability of the object's composition
If fixing device is added to prevent unintentional shifting, then stability is improved, but device complexity increases
Solution Approach 1:
The fixing device is merged with the existing locking device structure, sharing common components such as the housing, actuating mechanism, and mounting points. This integration ensures that the fixing function is added without requiring a completely separate system, thereby minimizing the increase in device complexity while still providing the necessary stability.
3Ease of operation
If locking devices are made manually actuable, then ease of operation is improved, but reliability deteriorates due to human error
Solution Approach 1:
The manual actuation mechanism is designed with mechanical features such as detents, springs, and positive engagement elements that eliminate the need for precise human control. The mechanical system automatically ensures proper engagement and locking, replacing the need for skilled manual operation and reducing human error while maintaining ease of use.
Data Source
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AI summary
The invention relates to a hand-held power tool (10), in particular a screwdriver and/or drill, with a drive motor (16) for driving a gear drive (25) of a gearbox (30), which has a gear output (26) for driving a tool holder (18) of the hand-held power tool (10) and a first gear stage (41) and a second gear stage (42), wherein the gearbox has a first locking device (61) for locking a gear element forming a locking gear element (43) of the first gear stage (41) and a second locking device (62) for locking a gear element forming a locking gear element of the second gear stage (42), wherein the gear stage with the respective locked locking gear element transmits a torque from the gear drive (25) to the gear output (26).wherein the direction of rotation of the drive motor (16) is switchable and, depending on the direction of rotation of the drive motor (16), the first gear stage (41) or the second gear stage (42) transmits a torque from the gear input (25) to the gear output (26), wherein the locking devices (61, 62) lock the respective locking gear element (43, 46) in a locking direction (S1, S2) and release it in a free-running direction, and wherein it has a switching device for switching the locking direction (S1, S2) and the free-running direction of at least one locking device (61, 62), in particular both locking devices (61, 62). It is provided that it has a locking device for fixing the locking devices in the respective switching position (T1, T2).