Rotatable Torque Limiting Sleeve for Constant Torque Driver
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Solution Overview
Problem
Conventional screwdriver tools lack a torque control mechanism, leading to potential damage from excessive torque, which can cause fasteners to loosen or become damaged, compromising safety and effectiveness.
Innovation Solution
A constant torque tool featuring a driver body with a handle and working rod, and a sleeve member with blocking structures that deform and slide when excessive torque is applied, preventing over-torque damage by engaging and disengaging precisely.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional screwdriver tools are used without torque control, then the tool structure remains simple, but the fastener may be damaged due to excessive torque
Solution Approach 1:
The patent changes the physical state of the blocking structures from rigid to deformable, allowing them to yield under excessive torque. This parameter change enables the torque limiting function without requiring complex control systems, resolving the contradiction between preventing damage and maintaining structural simplicity.
Solution Approach 2:
The blocking structures automatically engage and disengage based on the torque applied, without requiring external control mechanisms. The system self-regulates torque by deforming when the predetermined torque is exceeded, eliminating the need for complex electronic or mechanical control systems while still preventing fastener damage.
2Reliability
If torque control mechanism is added to prevent over-torque damage, then fastener safety is improved, but the device complexity increases
Solution Approach 1:
The blocking structures are designed as sacrificial elements that deform or break when excessive torque is applied. This simple, inexpensive mechanism provides reliable torque control by sacrificing the blocking structure rather than requiring complex, expensive control systems, thus improving reliability without significantly increasing device complexity.
Solution Approach 2:
The patent extracts the torque control function from a complex control system and implements it through simple deformable blocking structures. By separating the torque limiting function from the overall tool operation, the design achieves reliable torque control with minimal added complexity.
3Measurement precision
If blocking structures are made rigid for precise engagement, then torque control precision is improved, but the ability to limit torque is reduced
Solution Approach 1:
The blocking structures are designed with specific deformation characteristics that allow them to maintain precise engagement at normal operating torques while yielding at predetermined excessive torque levels. This parameter optimization achieves both precise torque control and automatic torque limiting without compromising either function.
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 tool ensures consistent torque application, preventing damage to fasteners and enhancing the reliability of fastening operations by limiting torque to a predetermined level.
Implementation Method 1
When there is a relative torque greater than a predetermined torque between the sleeve member and the driver body, at least one of the second blocking structure and the first blocking structure deforms and the second blocking structure is slidable over the first blocking structure in the rotation direction
Implementation Method 2
the second blocking structure is releasably stuck with the first blocking structure in a rotation direction of the sleeve member
Data Source
AI summary
A constant torque tool provided, including: a driver body, including a handle and a working rod connected with the handle, at least one of the handle and the working rod being integrally formed with a first blocking structure; a sleeve member, being rotatably disposed around the driver body and integrally formed with a second blocking structure, the second blocking structure being releasably stuck with the first blocking structure in a rotation direction of the sleeve member; wherein when there is a relative torque greater than a predetermined torque between the sleeve member and the driver body, at least one of the second blocking structure and the first blocking structure deforms and the second blocking structure is slidable over the first blocking structure in the rotation direction.