Torque Screwdriver Asymmetric Ratchets and Support Rings
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Solution Overview
Problem
Conventional torque screwdrivers lack precision and stability in torque delivery due to abrupt changes in torque and inadequate support for the operation stem, leading to unstable operation and susceptibility to rust and bacterial growth, making them unsuitable for sanitary environments.
Innovation Solution
A torque screwdriver with a T-shaped main body, an operation stem featuring ratchets with gentle and steep tooth faces, elastic abutment assemblies, and support rings for stable operation, along with leakproof members for waterproofing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the tooth face is made steep to enable two-way operation, then the tool can operate clockwise and counterclockwise, but the torque changes abruptly and precision is reduced
Solution Approach 1:
The ratchet tooth is designed with asymmetric tooth faces having different slopes. The first tooth face has a smaller slope angle for gentle torque transition, while the second tooth face has a larger slope angle for rapid reset. This asymmetric geometry enables the steel ball to follow different paths during clockwise and counterclockwise operations, achieving both two-way operation capability and precise torque control.
2Device complexity
If the operation stem is pivotally disposed without support rings, then the structure is simple, but the operation stem shakes and friction is high
Solution Approach 1:
Support rings are introduced as intermediary elements between the operation stem and the main body. These rings act as mediators that reduce direct contact and friction between the operation stem and the shaft hole wall, providing smooth support and stable operation while maintaining relatively simple structure.
3Ease of manufacture
If the tool lacks waterproof design, then the structure is simple and easy to manufacture, but the internal components rust and bacteria grow
Solution Approach 1:
A waterproof film is introduced to seal the internal cavity of the main body, creating a protective barrier that prevents moisture and bacteria from entering. This thin film structure provides effective waterproofing while adding minimal complexity to the manufacturing process.
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 screwdriver provides precise and stable torque values with reduced abrupt changes, ensuring accurate operation and resistance to rust and bacterial growth, enabling use in sanitary environments.
Implementation Method 1
an inner end of the elastic member pressing the abutment member to make the abutment member elastically contact the operation stem
Data Source
AI summary
A torque screwdriver includes: a main body having a transverse handle section and a vertical tubular section, the handle section being formed with an internal passage having two cavities respectively formed on two sides of the tubular section; the tubular section being formed with an internal axial space; an operation stem, several ratchets and several recesses being disposed at a top end of the operation stem, each ratchet having a long tooth face and a short tooth face, the long tooth face having a slope smaller than a slope of the short tooth face; the operation stem being mounted in the main body; two elastic abutment assemblies respectively mounted in the two cavities to elastically press two abutment members to elastically contact the operation stem; and at least two support rings disposed between the operation stem and the main body.