Double Ratchet Wrench Direction Switching Mechanism
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Solution Overview
Problem
Conventional double ratchet wrenches have unstable and complex structures, with small and unreliable switch buttons that make direction switching inconvenient and prone to breakage.
Innovation Solution
A double ratchet structure with a base, directional members, resetting members, a choosing member with a detent portion, and a driving member that allows for stable direction switching by dispersing force and providing a larger switching volume, enhancing stability and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional double ratchet structure is used, then direction switching is achieved, but the structure becomes complicated and unstable
Solution Approach 1:
The double ratchet structure is divided into two independent directional members (first and second directional members), each with its own claw and resetting member. This segmentation allows each component to perform its function independently, simplifying the overall structure while maintaining the ability to switch between two directions.
Solution Approach 2:
The base structure serves multiple functions: it supports both directional members, provides the detent portion for catching claws, and houses the resetting members. This multi-functionality reduces the need for additional supporting components, thereby reducing overall structural complexity.
2Volume of moving object
If a small switch button is used in conventional double ratchet wrench, then the wrench size is compact, but the switch button becomes unreliable and easily broken
Solution Approach 1:
The choosing member is designed to rotate about a pivot point, transforming the switching action from linear pressing (small button) to rotational motion (larger arc). This dimensional change allows for a larger effective switching area while maintaining a compact overall wrench design, improving reliability through better force distribution.
3Volume of moving object
If a small switch button is used, then the wrench is compact, but direction switching becomes inconvenient and difficult to operate
Solution Approach 1:
The choosing member's rotational movement about a pivot provides a larger operational arc compared to pressing a small button. This allows the user to apply force more easily and switch directions with greater convenience, while the compact base maintains overall wrench compactness.
4Adaptability or versatility
If the conventional double ratchet structure is used, then direction switching is possible, but the structure is unstable
Solution Approach 1:
The base acts as an intermediary structure that securely connects both directional members and provides the detent portion. This central intermediary element distributes forces evenly and stabilizes the entire mechanism, preventing the instability that occurs in conventional designs where directional members may not be adequately supported.
Data Source
AI summary
A double ratchet structure includes a base, a first directional member, a second directional member, two resetting members, a choosing member, a driving member and a pivoting member. The first and second directional members are pivotally disposed on the base, and the first directional member pivots oppositely to the second directional member. The resetting members are respectively disposed between the first or the second directional member and the base for protruding the first or the second directional member from the base. The choosing member is coaxially and pivotally disposed on the base and covers the first and the second directional members. The choosing member catches the first or the second to pivot toward the base. The driving member is coaxially and pivotally disposed on the base through the pivoting member for engaging with the first or the second directional member.