Ratchetable Open-Ended Wrench with Elastic Auxiliary Jaw
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Solution Overview
Problem
Conventional ratchetable open-ended wrenches face issues such as poor tightening/loosening performance, easy abrasion of toothed surfaces, complicated structures leading to increased weight and inaccurate sizing, and inconvenient operation due to the need for sequential partial-turn strokes during reverse rotation, which affects their service life and usability.
Innovation Solution
A ratchetable open-ended wrench design featuring a handle with a wrench head including a first jaw, a second jaw, an auxiliary jaw that is elastically slidable, and a limiting slot, allowing for smooth continuous operation by minimizing the jaw opening size and distributing torque effectively, enabling smooth back-ratcheting without obstructing the auxiliary jaw's movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the retractable claws/jaws are formed with toothed surfaces parallel to each other to contact parallel sides of the screw, then the wrench can rotate the screw clockwise and turn back counterclockwise, but the tightening/loosening performance is poor and the toothed structure is easily abraded
Solution Approach 1:
The patent applies asymmetry by providing a first retractable jaw with a first engaging surface and a second retractable jaw with a second engaging surface that is not parallel to the first. This asymmetric configuration allows the wrench to effectively engage with the workpiece for tightening and loosening operations while maintaining the ratchetable function, thereby resolving the contradiction between ease of ratchetable operation and reliability of tightening/loosening performance.
2Adaptability or versatility
If the jaw opening is made larger than the size of the screw/workpiece to accommodate the retractable claws/jaws, then the wrench can accommodate the retractable mechanism, but the retractable claws/jaws are continuously abraded during operation
Solution Approach 1:
The patent applies dynamics by making the retractable jaws slidable within the wrench head along guide slots, allowing them to move dynamically during operation. This dynamic configuration enables the jaws to adapt to the workpiece size while maintaining proper contact, reducing continuous abrasion. The limiting members further control the movement range to prevent excessive wear.
3Ease of operation
If the through slots accommodating the retractable claws/jaws are provided, then the wrench can perform ratchetable operation, but the wrench head structure is weakened
Solution Approach 1:
The patent applies segmentation by dividing the retractable jaw mechanism into separate components (first retractable jaw, second retractable jaw, limiting members) that can move independently within the wrench head. This segmentation allows the ratchetable function to be achieved while distributing the structural load, preventing the through slots from significantly weakening the overall wrench head structure.
4Adaptability or versatility
If the driving opening has a complicated structure with bearing surface and recesses not smoothly connected, then the wrench can accommodate the retractable jaw mechanism, but sequential partial-turn strokes are required during reverse rotation, slowing the operation rate
Solution Approach 1:
The patent applies curvature by providing a smoothly contoured driving opening with a bearing surface that transitions smoothly into the recesses. This curved, continuous geometry allows the retractable jaws to move seamlessly during reverse rotation without requiring sequential partial-turn strokes, thereby increasing the operation rate while maintaining the retractable mechanism functionality.
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 design enhances the wrench's operational smoothness and durability by allowing continuous, efficient tightening and loosening with reduced wear and tear, maintaining the wrench's strength and size consistency with conventional open-ended wrenches, and enabling seamless back-ratcheting without the need for sequential strokes.
Implementation Method 1
an auxiliary jaw elastically and longitudinally slidable along the auxiliary jaw retracting opening
Implementation Method 2
an exterior end having a pillow in contact with the inner wall and a pushing surface for working together with the first jaw to grip and rotate the workpiece W
Data Source
AI summary
A ratchetable open-ended wrench includes a handle for a hand to grasp, a wrench head located on one end of the handle, and a fastener room located in the wrench head for accommodating a workpiece to be rotated. The wrench head further includes a first jaw having a first driving wall, a second jaw having a second driving wall facing the first driving wall, an inner wall extending from the second driving wall into the second jaw, a concavity, an auxiliary jaw retracting opening, an auxiliary jaw capable of longitudinally sliding into the auxiliary jaw retracting opening in an elastic way, and an auxiliary jaw limiting member coupled to a limiting slot. The auxiliary jaw further includes an exterior end having a pillow in contact with the driving wall and a pushing surface for working together with the first jaw to grip the workpiece under operation, an interior end, and a limiting slot.