Ratchet Wrench Switching Device for Bolt-Free Retention
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Solution Overview
Problem
Conventional ratchet wrenches with exposed bolts fail to meet aesthetic standards and pose a risk of losing small internal parts when the cover is removed, affecting functionality and market value.
Innovation Solution
A ratchet wrench design that uses a single clip to retain the driving member within the head without bolts, employing a switching device with a lever and push unit to precisely and stably move the pawl, allowing for high torque output and eliminating the need for a cover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If bolts and cover are used to retain parts in the head, then the structure is simple and easy to manufacture, but the aesthetic appeal deteriorates and parts may be lost
Solution Approach 1:
The patent removes the cover and bolts from the conventional ratchet wrench structure, extracting the retaining function and replacing it with an integrated head design where the second room is covered by the head itself. This eliminates the aesthetic drawbacks of exposed bolts while maintaining structural integrity through the integrated design.
Solution Approach 2:
The patent merges the cover and head into a single integrated head structure. The head simultaneously serves as both the protective cover and the structural component, eliminating the need for separate cover and bolt assemblies. This integration improves aesthetics while the internal clip mechanism provides secure retention.
2Reliability
If multiple clips are used to retain the driving member, then the retention is more secure, but the device complexity increases
Solution Approach 1:
The clip is designed with multiple functional segments: a body portion for engagement, a resilient portion for providing retaining force, and a positioning feature for precise location. This single multi-functional component replaces what would traditionally require multiple separate clips or retaining elements, reducing complexity while maintaining secure retention.
Solution Approach 2:
The clip serves multiple functions simultaneously: it retains the driving member, positions it precisely, and provides resilient retention force. This multi-functional design eliminates the need for separate retaining clips, positioning elements, and resilient members, reducing the overall number of components while ensuring reliable retention.
3Measurement precision
If the pawl is moved by direct mechanical contact, then the structure is simple, but the positioning precision and stability deteriorate
Solution Approach 1:
The board acts as an intermediary element between the switching device and the pawl. Instead of direct contact, the board transfers the pushing force to the pawl through a controlled interface, improving positioning precision and stability while distributing the mechanical interaction over a larger contact area.
Solution Approach 2:
The switching mechanism operates by moving the board in a radial direction within the tubular portion, which then translates this motion into precise linear movement of the pawl along the slot. This dimensional transformation from radial to linear motion enables precise control while maintaining a compact structure.
4Reliability
If a cover is used to enclose the head, then the internal parts are protected, but the aesthetic appeal deteriorates and access is required
Solution Approach 1:
The protective function traditionally provided by the cover is merged into the head structure itself. The head is designed with an integrated second room that is covered by the head body, eliminating the need for a separate cover while maintaining protection of internal parts and preserving aesthetic appearance.
Solution Approach 2:
The cover is extracted from the conventional design and its protective function is redistributed to the head structure. The head now serves dual purposes: as the external aesthetic component and as the protective enclosure for internal parts, eliminating the need for separate covering elements.
Data Source
AI summary
A ratchet wrench includes a head with a driving member located in a first room thereof. A clip is engaged with a first groove in the first room and a second groove in the driving member to retain the driving member in the first room. A pawl is received in a second room defined in the inside of the first room and engaged with the driving member. The pawl has a lip on the rear side thereof. A switching device is located in a third room communicating with the second room and outside of the wrench. The lip is inserted in a slot in the switching device. The switching device has a board which is rested on the lip and pushes either one of the two inclined faces of the recess in the rear side of the pawl to change the ratcheting engagement between the pawl and the driving member.