Wrench Returning Device Eccentric Retainer Anti-Rotation
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Solution Overview
Problem
Conventional wrench tools with auxiliary retainers face issues in securely retaining bolts due to random rotation within cylindrical orifices, leading to incomplete contact and insecure positioning during reverse operations.
Innovation Solution
A returning device for a wrench tool featuring an auxiliary retainer with eccentric positioning and a positioning shaft, combined with a resilient element, ensures secure retention and prevents rotation, allowing for resilient movement and precise engagement with bolt elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a cylindrical orifice is used to house the auxiliary retainer, then the manufacturing is simplified, but the auxiliary retainer rotates randomly and cannot retain the bolt tool securely
Solution Approach 1:
The patent applies asymmetry by changing the orifice from a cylindrical symmetric shape to an eccentric positioning structure. The positioning shaft is offset from the center of the orifice, creating an asymmetric configuration that prevents the auxiliary retainer from rotating randomly. This asymmetric design ensures that the retainer maintains a fixed angular position while still allowing linear movement, thereby securing the bolt tool reliably without complicating the manufacturing process excessively.
2Reliability
If a slot is added to limit the auxiliary retainer movement, then the retention is improved, but the auxiliary retainer rotates slightly and cannot position securely
Solution Approach 1:
The patent introduces a positioning shaft as an intermediary element between the orifice and the auxiliary retainer. This positioning shaft engages with the slot on the auxiliary retainer, acting as a mediator that converts the linear slot movement into constrained motion. The positioning shaft prevents excessive rotation while maintaining secure retention, achieving both reliability and positioning precision by mediating the interaction between the retainer and the orifice.
3Ease of operation
If the slot is positioned at a suitable distance from the limiting element, then the auxiliary retainer moves smoothly, but it rotates slightly in the orifice
Solution Approach 1:
The patent applies dynamics by creating a dynamic positioning system where the auxiliary retainer can move linearly along the slot while the positioning shaft maintains angular constraint. The system allows the retainer to dynamically adjust its position along the slot for smooth movement, while the eccentric positioning of the shaft prevents rotation. This dynamic configuration balances movement smoothness with positioning precision.
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 solution enables secure retention and precise engagement of bolt elements, enhancing the wrench tool's ability to handle reverse operations and idle rotations without disengagement, thereby improving the tool's overall functionality and reliability.
Implementation Method 1
a resilient element used to push the auxiliary retainer so that the retaining portion of the auxiliary retainer elastically extends out of the recessed section
Data Source
AI summary
A returning device of a wrench tool contains a body including a tool segment disposed on at least one end portion thereof and having two jaws, an engaging face of at least one of the two jaws including a recessed section in which a receiving groove with a stop rim is formed, the stop rim including a slot fixed on an eccentric position thereof; an auxiliary retainer inserted in the receiving groove and having a retaining portion; a positioning shaft including a front end connected at an eccentric position of a rear end of the auxiliary retainer and including a rear end extending out of the slot and allowing to prevent the auxiliary retainer from disengagement from the receiving groove; a resilient element used to push the auxiliary retainer so that the retaining portion extends out of the recessed section of the at least one of the two jaws.