Rotating Striking Unit Drive for Lower Transmission Release Load
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Solution Overview
Problem
The load on the first and second transmission portions increases during the release process in conventional driving tools.
Innovation Solution
A driving tool with a striking unit that includes a rotating member and a second transmission portion with engaging portions that can be engaged and released smoothly, utilizing a return mechanism to minimize the load on these portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the second transmission portion is engaged and released from the first transmission portion during striking unit actuation, then the striking unit can change direction, but the load on the transmission portions increases during the release process
Solution Approach 1:
The second transmission portion is divided into two distinct engaging portions: a first engaging portion that engages with the first transmission portion during normal operation, and a second engaging portion that specifically engages during the release process. This segmentation allows each portion to be optimized for its specific function, with the second engaging portion designed to reduce load during release.
Solution Approach 2:
The second engaging portion acts as an intermediary mechanism during the release process. It temporarily engages with the first transmission portion to facilitate smooth disengagement of the first engaging portion, thereby mediating the load transfer and reducing peak loads on the transmission portions.
2Reliability
If a return mechanism is added to return the second engaging portion to initial position, then the release process is improved, but the device complexity increases
Solution Approach 1:
The return mechanism is designed to automatically return the second engaging portion to its initial position using the existing motion of the striking unit and rotating member. The mechanism utilizes the natural cyclic motion already present in the system, requiring no external power source or additional control systems, thereby maintaining simplicity while improving reliability.
Solution Approach 2:
The return mechanism is integrated with the existing transmission components rather than being a separate system. The second engaging portion and its return path are combined with the rotating member and first transmission portion, sharing common structural elements and motion paths, which minimizes the increase in overall device complexity.
Data Source
AI summary
A driving tool includes: a striking unit striking a fastener by being actuated in a first direction; a rack on the striking unit; a wheel; and a second transmission portion on the wheel and capable of being engaged with and released from the rack. The striking unit can be actuated in a second direction when the second transmission portion is engaged with the rack, and the striking unit can be actuated in the first direction when the second transmission portion is released from the rack. The second transmission portion includes: a tooth portion arranged along a rotation direction of the wheel and turned in a predetermined direction to be engaged with and released from the rack; and a movable piece actuated in the predetermined direction to be engaged with the rack and actuated in a different direction from the predetermined direction to be released from the rack.