Roller Clutch Biasing Mechanism for Reduced Ratcheting Angle
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Solution Overview
Problem
Conventional ratchet tools require excessive angular displacement of the handle, making them unusable in confined spaces due to the minimum angular displacement constraint, which is undesirable for applications where space is limited.
Innovation Solution
A roller clutch mechanism with a biasing and reversing mechanism that reduces relative rotation between the ratchet body and drive head by using a cage member to locate rollers in either a clockwise or counterclockwise position, applying a constant bias to quickly engage them between the ratchet body and drive head, thereby reducing the ratcheting angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional ratchet tools are used, then torque can be applied to fasteners, but excessive angular displacement of the handle is required
Solution Approach 1:
The patent changes the operational parameters of the ratchet mechanism by introducing a roller clutch system with biasing springs that maintain constant engagement between the ratchet body and drive head. This eliminates the need for excessive handle angular displacement while maintaining torque application capability, directly resolving the contradiction between ease of operation and adaptability to confined spaces
Solution Approach 2:
The patent employs a dynamic roller clutch mechanism where rollers are continuously biased against the drive head, creating a dynamic engagement system that eliminates backlash and reduces the minimum ratcheting angle. This dynamic system allows the tool to function effectively in confined spaces where minimal handle movement is available
2Reliability
If minimum angular displacement is required to overcome backlash, then torque can be applied, but the tool cannot be used in confined spaces
Solution Approach 1:
The biasing springs continuously push the rollers against the drive head before torque application, pre-establishing engagement and eliminating backlash. This preliminary action ensures reliable torque transmission from the first degree of handle movement, eliminating the need for excessive angular displacement and enabling use in confined spaces
Solution Approach 2:
The roller clutch mechanism acts as an intermediary between the handle and drive head, using biased rollers to maintain constant contact and eliminate backlash. This intermediary system ensures reliable torque transmission with minimal handle movement, resolving the contradiction between reliability and confined space adaptability
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 allows for improved performance of reversible ratchet tools by minimizing the ratcheting angle, enabling their use in confined spaces by reducing the need for excessive handle movement, thus enhancing usability in obstructed locations.
Implementation Method 1
The reverser mechanism applies a constant bias to the cage member so that the rollers are biased to quickly engage between the ratchet body and the drive head
Data Source
AI summary
A roller clutch mechanism of a reversible ratchet tool is configured to include a biasing and reversing mechanism for biasing rollers in the roller clutch mechanism. A cage member of the roller clutch mechanism locates rollers in either a clockwise or counterclockwise position based on a selective position of the reverser mechanism. The reverser mechanism applies a constant bias to the cage member so that the rollers are constantly biased and quickly engage between the ratchet body and the drive head. The constant bias applied to the cage member reduces the ratcheting angle for improved performance of the reversible ratchet tool.