Screwing Tool Freewheel Lock for Single-Handed Direction Switching
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Solution Overview
Problem
Existing screwing tools with freewheel locks require complex two-handed operations to switch between clockwise and counterclockwise rotations, limiting single-handed use and efficiency.
Innovation Solution
A screwing tool with a switching ring that allows for single-hand operation by rotating the switching ring in the same direction as the desired freewheel direction, enabling seamless switching between clockwise and counterclockwise rotations without the need to change hand positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the switching ring is adjusted relative to the handle merely for changing the switching position (prior art), then the device complexity is reduced, but the ease of operation deteriorates because two-handed operations are required
Solution Approach 1:
The patent merges the switching ring adjustment function with the handle rotation function. The switching ring is integrated into the handle such that rotating the handle simultaneously performs both the adjustment of the switching ring and the actuation of the freewheel lock, eliminating the need for separate two-handed operations
Solution Approach 2:
The handle serves multiple functions: it acts as both the gripping element and the switching mechanism. By making the switching ring rotatable relative to the handle, the handle becomes a multi-functional component that enables both operation and adjustment with a single hand
2Ease of operation
If the switching direction is oriented opposite to the freewheel direction (prior art), then the device complexity is reduced, but the ease of operation deteriorates due to non-intuitive switching
Solution Approach 1:
The patent inverts the conventional switching direction arrangement. Instead of having the switching direction opposite to the freewheel direction, the switching ring is designed to be adjustable in the same direction as the desired freewheel direction, making the operation intuitive and self-explanatory
3Productivity
If a single-hand switchover is enabled, then the productivity is improved, but the reliability deteriorates due to potential switching errors
Solution Approach 1:
The patent incorporates visual feedback through circumferential markings on the switching ring that indicate the current switching position. This feedback mechanism allows the user to verify the switching state with a single glance, reducing switching errors while maintaining single-hand operation efficiency
Data Source
AI summary
A screwing tool has a driving portion, an output portion, and a switching ring of a freewheel lock, the switching ring being disposed axially between the driving portion and the output portion, and the freewheel lock being able to be brought, by rotation of the switching ring in an azimuthal switching direction, into a freewheel position, in which the output portion can be rotated relative to the driving portion in a freewheel direction. In order to enable a “quick screwing function” by means of the screwing tool, the switching ring can be rotated in the freewheel direction in question without limitation, which is achieved by virtue of the fact that the switching direction corresponds to the freewheel direction.