Gearless Ratchet Tool with Spring-Loaded Pins and Low Swing Angles
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Solution Overview
Problem
Existing gearless ratchet designs face issues with wear and friction, leading to decreased torque and increased swing angles due to uneven pin loading and material wear, making them unsuitable for confined spaces.
Innovation Solution
The design incorporates pins with varying geometries and materials, along with springs to maintain engagement, and specific dimensional relationships to minimize wear and friction, ensuring low or zero swing angles and improved torque delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional gearless ratchet designs are used, then the structure is simple, but wear and friction increase leading to decreased torque and increased swing angles
Solution Approach 1:
The patent applies local quality by using pins with varying geometries and materials at different locations within the ratchet mechanism. Specifically, pins have different lengths, diameters, and material compositions (including hardened steel pins) to optimize engagement with the outer race at different positions, thereby reducing wear and maintaining torque consistency without significantly increasing overall structural complexity
Solution Approach 2:
The patent employs composite materials by combining different pin materials (including hardened steel) with different outer race materials. This material differentiation reduces friction and wear at critical engagement points, addressing the reliability issue while maintaining the simplicity of the gearless ratchet structure
2Ease of manufacture
If traditional pin designs are used, then manufacturing is easy, but uneven pin loading causes increased wear and friction
Solution Approach 1:
The patent implements local quality by designing pins with varying geometries (different lengths, diameters, and shapes) and materials to distribute loading more evenly across all pins during operation. This localized optimization reduces uneven wear and friction while maintaining manufacturing feasibility through standard machining processes
Solution Approach 2:
The patent applies parameter changes by systematically varying pin dimensions (length, diameter) and material properties to optimize load distribution. These parameter modifications address the uneven loading issue and reduce wear/friction while remaining compatible with conventional manufacturing methods
3Duration of action of stationary object
If material wear occurs, then the mechanism continues to operate, but torque decreases and swing angles increase
Solution Approach 1:
The patent applies beforehand cushioning by using springs to maintain constant engagement between the pins and the outer race. This spring-loaded mechanism compensates for wear that occurs during operation, ensuring that torque delivery and swing angle control are maintained throughout the operational lifespan without significant degradation
Solution Approach 2:
The patent employs parameter changes by using springs to dynamically adjust the engagement force between pins and outer race as wear occurs. This active compensation mechanism maintains reliable torque delivery and controls swing angles throughout the component's service life, addressing the deterioration issue
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 enhances the durability and performance of gearless ratchets by reducing wear, maintaining low swing angles, and providing consistent torque in confined spaces.
Implementation Method 1
The clutch mechanism further includes a plurality of springs. Each spring includes a first end and a second end opposing the first end, the first end of each spring coupled to one of the plurality of pins and the second end of each spring coupled to an adjacent projection.
Implementation Method 2
When the handle is rotated in a clockwise direction, the plurality of pins engage with the cylindrical surface of the bore such that the drive mechanism is prevented from spinning.
Data Source
AI summary
Various designs for a gearless ratchet mechanism and tools incorporating the gearless ratchet mechanism are described. One embodiment relates to a gearless ratchet with a design for improved performance including low or zero swing angle and/or decreased part wear. Another embodiment relates to a gearless ratchet with features designed to maximize life and strength of the tool.