Co-rotation Preventing Mechanism for Screw Driver Bit Alignment
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Solution Overview
Problem
Conventional screw drivers face issues with unintentional rotation of the end bit during the OFF state of the clutch mechanism, making it difficult to align with the screw head, especially when the user forgets to switch to reverse rotation, leading to misalignment and potential damage.
Innovation Solution
A screw driver design incorporating a housing, drive portion, end bit mounting portion, clutch mechanism, and a co-rotation preventing mechanism that engages with the end bit mounting portion to prevent forward rotation while allowing reverse rotation, ensuring precise alignment and control during screw operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the clutch mechanism is turned OFF to stop power transmission, then energy consumption is reduced, but the end bit may unintentionally rotate due to residual friction or user error in switch position
Solution Approach 1:
The co-rotation preventing mechanism is designed to preemptively counteract the harmful effect of unintentional end bit rotation. When the clutch mechanism is OFF, the preventing mechanism engages to block forward rotation of the end bit mounting portion, thereby preventing misalignment before it can occur. This preliminary anti-action ensures that even if residual friction or user error causes the clutch to slip, the end bit remains securely aligned with the screw head.
2Ease of operation
If the clutch mechanism is turned OFF to prevent power transmission, then unwanted driving force is eliminated, but alignment becomes difficult due to residual friction or switch position errors
Solution Approach 1:
The co-rotation preventing mechanism performs a preliminary action by engaging the prevention engagement portion before any unintentional rotation can occur. The preventing mechanism is pre-configured to block the rotational path of the end bit mounting portion when the clutch is OFF, ensuring that the end bit remains in precise alignment with the screw head groove from the moment power transmission is stopped.
3Device complexity
If a simple clutch mechanism is used to control power transmission, then device complexity is reduced, but unintentional rotation occurs due to residual friction or user error
Solution Approach 1:
The rotation control system is segmented into two independent functional modules: the clutch mechanism for controlling power transmission, and the co-rotation preventing mechanism for blocking unintentional rotation. The preventing mechanism includes separate components (prevention engagement portion, prevention engaging protrusion, and preventing member) that work independently from the clutch mechanism, allowing each module to perform its specific function with high reliability without increasing overall system complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The co-rotation preventing mechanism effectively prevents unintentional rotation of the end bit during the clutch OFF state, enhancing user control and reducing misalignment issues, thereby improving the accuracy and safety of screw driving operations.
Implementation Method 1
the spring section (63) is configured to prevent the end bit mounting portion (5) from being rotated in a forward direction by coil binding when the end bit mounting portion is rotated in the forward direction and to allow the end bit mounting portion to rotate in a reverse direction
Data Source
Figure 1
Figure 2~4
Figure 5~7
AI summary
A screw driver (1) capable of avoiding co-rotation of an end bit and a motor (3) in case of sharp shooting the end bit with a groove in a head of a screw. A co-rotation preventing mechanism is engageable with an end bit mounting portion (5) when the end bit mounting portion (5) is at a frontward position to prevent the end bit mounting portion (5) from being rotated in the forward direction and to allow the end bit mounting portion (5) to rotate in the reverse direction. The preventing mechanism is disengageable from the end bit mounting portion when the end bit mounting portion is at the rearward position to allow the end bit mounting portion to rotate in both forward and reverse directions.