Torque Stick Spring Mechanism for Precise Impact Tool Torque
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Solution Overview
Problem
Rotary impact tools struggle to deliver torque to workpieces with precision, often leading to over-torqueing or under-torqueing, especially when dealing with stuck fasteners.
Innovation Solution
A tool attachment for rotary impact tools that includes a concentric body system with a spring mechanism to limit torque delivery, featuring a torque stick that deflects and rebounds based on spring stiffness, and a controller to monitor and adjust motor operation for precise torque control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a rotary impact tool is used to deliver high torque to stuck fasteners, then the fastener can be removed, but the torque delivery precision deteriorates leading to over-torqueing or under-torqueing
Solution Approach 1:
The patent changes the physical state of the torque stick from rigid to flexible by introducing a flexible shaft portion. This flexible shaft can deflect and rebound based on spring stiffness, allowing the system to adapt torque delivery to the workpiece conditions and achieve precise torque control within a predetermined range while preventing over-torqueing
Solution Approach 2:
The patent introduces dynamic characteristics to the torque stick through the flexible shaft portion and spring mechanism. The shaft can dynamically deflect during torque application and rebound when torque is released, enabling the system to respond to real-time workpiece conditions and maintain reliable torque control accuracy throughout the fastening operation
2Device complexity
If a rigid torque stick is used to limit torque, then torque control is simplified, but the ability to handle variable torque requirements deteriorates
Solution Approach 1:
The patent changes the mechanical properties of the torque stick by incorporating a flexible shaft portion with specific spring stiffness characteristics. This allows the torque stick to adapt to variable torque requirements through its elastic deformation, providing versatility across different fastening applications while maintaining relatively simple control mechanism
Solution Approach 2:
The patent enables the torque stick to dynamically adjust its torque limiting characteristics through the flexible shaft's deflection and rebound behavior. The spring stiffness parameter allows the system to adapt to different torque ranges and workpiece conditions without requiring complex adjustable mechanisms
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
Enables precise torque delivery to workpieces within a predetermined range, preventing over-torqueing and ensuring consistent fastening results.
Implementation Method 1
a spring interconnecting the first end and the second end, where the spring has a spring stiffness. The spring enables the first end to rotate relative to the second end in response to a reaction torque being exerted on the spring from the workpiece in accordance with the spring stiffness
Implementation Method 2
The first concentric body rotates relative to the second concentric body to limit the amount of torque delivered from the rotary impact tool to the workpiece
Data Source
AI summary
A tool attachment includes a first end configured to engage a rotary impact tool, a second end disposed distally from the first end and configured to engage a workpiece, a first concentric body that is coupled to and rotated by the first end, and a second concentric body that is coupled to the second end and rotated by the first concentric body. The second concentric body and the first concentric body are coupled together. The first concentric body rotates relative to the second concentric body to limit the amount of torque delivered from the rotary impact tool to the workpiece.