Quick-Turning Wrench Jaw Design Without Pawl
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Solution Overview
Problem
The existing open-end ratcheting wrenches are complex and expensive to manufacture, and the pawl can get jammed, limiting their efficiency in quick-turning applications.
Innovation Solution
A quick-turning wrench design featuring a driving end with specific grip-surface sections and angles between jaws that allow for efficient gripping and turning of objects, enabling quick rotation in both clockwise and counterclockwise directions without the need for a spring or pawl, reducing the risk of jamming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a pawl and spring mechanism is used to enable quick turning, then the wrench can turn objects more quickly, but the device complexity increases and manufacturing cost increases
Solution Approach 1:
The patent removes the pawl and spring mechanism from the wrench design entirely. Instead of using a ratcheting mechanism with moving parts, the invention uses a simple open-end jaw design that allows quick turning by manually repositioning the jaw to different engagement positions on the fastener, thereby eliminating complexity while maintaining productivity.
Solution Approach 2:
The jaw is divided into multiple engagement positions or notches along its length, allowing the user to engage different positions for different turning requirements. This segmentation provides multiple functional positions without requiring complex mechanisms, resolving the contradiction between quick turning capability and device simplicity.
2Productivity
If a pawl and spring mechanism is used to enable quick turning, then the wrench can turn objects more quickly, but the manufacturing cost increases
Solution Approach 1:
By extracting and removing the expensive pawl and spring components, the patent significantly reduces manufacturing cost. The simplified jaw design requires fewer materials and less complex machining operations, while still enabling quick turning through manual repositioning to different engagement positions.
3Productivity
If a pawl mechanism is used, then quick turning is enabled, but the pawl can get jammed reducing reliability
Solution Approach 1:
The patent eliminates the pawl mechanism entirely, removing the source of jamming problems. The reliability issue is resolved by replacing the complex ratcheting mechanism with a simple open-end jaw that has no moving parts to jam, while maintaining quick turning capability through manual repositioning to different engagement positions.
4Ease of operation
If multiple grip-surface sections with specific angles are used, then the wrench can grip objects more effectively, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies different surface characteristics to different local areas of the jaw. The grip surfaces have specific angular orientations optimized for engaging fastener flats, while other areas have different geometries for strength and positioning. This local differentiation improves gripping effectiveness without requiring extremely tight tolerances across the entire component.
Data Source
AI summary
A quick-turning wrench includes a driving end with a first jaw and a second jaw. The first and the second jaws respectively have a first and a second side, which face one another. The driving end defines an engaging space between the first and the second jaws. The driving end has a first grip-surface section, a second grip-surface section, and a third grip-surface section. The engaging space is partially delimited by the first, the second, and the third grip-surface sections. The first grip-surface section is adjacent to the first side and extends along a flat first phantom surface. The second and the third grip-surface sections are adjacent to the second side and respectively extend on a flat second phantom surface and a flat third phantom surface.