Torque Stick Wrench Aperture for Fastener Precision
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Solution Overview
Problem
Existing torque sticks and wrenches face challenges in accurately and efficiently applying torque to fasteners to prevent over-tightening or under-tightening, which can lead to joint deformation or loosening, especially when using impact tools, as they either lack precision or require multiple tool changes.
Innovation Solution
A torque limiting extension bar or torque stick with a wrench aperture that combines with a torque wrench to dynamically and statically apply torque, using an elongated shaft with a socket for rotary tools and an impact tool attachment, and a torque wrench with a sleeve and handle for precise torque specification, allowing for continuous and accurate torque application without tool disconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a torque stick is used with an impact tool to rapidly tighten fasteners, then productivity is improved, but manufacturing precision deteriorates due to inability to accurately control torque specification
Solution Approach 1:
The patent combines a torque stick (for rapid dynamic tightening) with a torque wrench (for precise torque control) into a single integrated tool. The torque wrench is received within the torque stick through a torque aperture, allowing the tool to function as both a rapid torque limiter and a precision torque applicator without requiring tool changes
Solution Approach 2:
The integrated tool serves multiple functions: it can rapidly tighten fasteners using impact tool dynamics through the torque stick, then transition to precise torque specification application using the torque wrench, all without disconnecting from the fastener. This multi-functionality resolves the contradiction by enabling both high-speed operation and precision control in a single tool
2Manufacturing precision
If a torque wrench is used to accurately apply torque to fasteners, then manufacturing precision is improved, but productivity deteriorates due to requiring multiple tool changes and time-consuming operations
Solution Approach 1:
The patent merges the torque stick and torque wrench into one tool, eliminating the need to disconnect and switch between tools. The torque wrench is received within the torque stick through a torque aperture, allowing seamless transition from rapid tightening to precision torque application
Solution Approach 2:
The integrated tool enables continuous operation without tool changes. The torque stick allows rapid initial tightening, then the torque wrench can be engaged through the aperture to apply precise torque specification, maintaining continuous engagement with the fastener throughout the process
3Device complexity
If existing torque sticks are used without a torque wrench aperture, then device complexity is reduced, but ease of operation deteriorates due to inability to apply precise torque specification without tool disconnection
Solution Approach 1:
The torque stick is segmented to include a torque aperture that receives the torque wrench. This segmentation allows the torque wrench to be integrated within the torque stick structure, enabling precise torque control without adding significant external complexity to the overall tool
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
This solution enables rapid and accurate torque application to fasteners, preventing joint deformation by dynamically limiting torque with the torque stick and ensuring precise torque specification with the torque wrench, enhancing both speed and accuracy in fastening processes.
Implementation Method 1
The torque stick limits the torque that the impact tool applies on the lug based on the torque stick's thickness and elastic modulus
Data Source
AI summary
A torque stick and torque wrench combination is provided that allows attachment of the torque stick to an impact tool to quickly fasten a nut or lug to an approximate desired torque. The operator can attach a torque wrench to an aperture of the torque stick to complete the fastening operation and achieve higher accuracy on the applied torque than a torque stick alone. In this way, the combination torque stick and torque wrench enable a greater degree of accuracy on the fastener's torque. The operator can also complete the fastening process without disassembling the connection of the torque stick from the lug.