Adjustable Ratchet Wrench Grip Positioning Mechanism
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Solution Overview
Problem
Conventional ratchet wrenches cannot change their drive mode to suit different use occasions, limiting their versatility in application.
Innovation Solution
A ratchet wrench design that includes a grip, a rod member, and a shaft with an adjustment structure allowing the relative position of the grip and rod member to be adjusted, enabling different drive modes by engaging the positioning member with various positioning portions, which controls the rotation direction and mode of operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the ratchet wrench has a fixed structure, then the structure is simple and easy to manufacture, but the adaptability to different use occasions is poor
Solution Approach 1:
The patent implements a dynamic adjustment mechanism that allows the grip and rod member to change their relative positions. The positioning member can selectively engage with multiple positioning portions (first, second, and third positioning portions) on the rod member, enabling the grip to be positioned at different locations along the rod member. This dynamic reconfigurability allows the same wrench structure to adapt to different use occasions - whether needing long lever arm for high torque or short lever arm for precision work - without requiring multiple different wrenches, thus improving adaptability while maintaining reasonable structural complexity.
Solution Approach 2:
The patent creates a universal ratchet wrench that can perform multiple functions through the adjustable positioning mechanism. By allowing the grip to be positioned at different locations along the rod member, a single wrench design serves multiple purposes: it can function as a high-torque wrench when the grip is positioned for maximum lever arm, or as a precision control wrench when the grip is positioned closer to the ratchet mechanism. This multi-functionality approach resolves the contradiction by making one structure serve multiple roles rather than requiring separate specialized tools.
2Adaptability or versatility
If the grip and rod member are fixed relative to each other, then the structure is stable and simple, but the drive mode cannot be changed for different operations
Solution Approach 1:
The patent segments the wrench into distinct functional components: the grip, the rod member with multiple positioning portions, the positioning member, and the ratchet mechanism. The rod member specifically is segmented along its length with multiple positioning portions (first, second, third positioning portions) that correspond to different grip positions. This segmentation allows the grip to be independently positioned at different locations, enabling different drive modes (high-torque mode with grip at first positioning portion, precision mode with grip at third positioning portion). The segmented design maintains manufacturing simplicity by using standard machining operations to create the positioning portions and engagement features.
3Adaptability or versatility
If multiple positioning positions are provided, then the versatility is improved, but the device complexity increases
Solution Approach 1:
The positioning mechanism is designed to be self-servicing through the interaction between the positioning member and the multiple positioning portions on the rod member. The positioning member, when manipulated, automatically engages with the appropriate positioning portion based on the desired grip position. The structure itself provides the positioning features (the positioning portions are integral to the rod member geometry) rather than requiring separate external positioning devices. This self-service approach allows multiple positioning positions to be implemented without proportionally increasing device complexity, as the positioning capability is built into the basic structure of the rod member and positioning member pair.
Data Source
AI summary
A ratchet wrench comprises a grip, having a first opening, a second opening and an accommodation space, an adjustment structure being connected to the first opening, the adjustment structure including a positioning seat and a positioning member, the positioning seat having a positioning hole; a rod member, slidably disposed in the positioning hole, the rod member including a polygonal rod section and a cylindrical rod section, a through hole being defined in the rod member, an annular body being connected to the polygonal rod section, the cylindrical rod section having a first positioning portion, the polygonal rod section having a second positioning portion, the positioning member being selectively engaged with the first positioning portion or the second positioning portion to adjust a relative position of the grip and the rod member; a shaft, disposed in the through hole, the shaft being rotatable relative to the rod member.