Ratchet Gear Retaining Ring for Cantilever Load Management
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Solution Overview
Problem
Existing ratcheting socket wrench designs face challenges in retaining the ratchet gear under cantilever-type loads, leading to deflection of the cover plate and compromised sealing, especially when screws are positioned low on the ratchet head.
Innovation Solution
A radially-locking retaining ring is used to secure the ratchet gear under the cover plate, allowing screws to maintain a positive clamping load on the cover plate, independent of the ratchet head's load rating, thereby keeping the gear in place and ensuring a seal even under cantilever loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If screws are positioned low on the ratchet head to provide a compact design, then the ratchet head size is reduced, but the cover plate deflects under cantilever loads and sealing is compromised
Solution Approach 1:
The invention divides the retention function into two separate components: the retaining ring handles gear retention under load, while the cover plate with screws handles sealing. This segmentation allows each component to be optimized for its specific function without compromise.
Solution Approach 2:
The retaining ring acts as an intermediary component between the ratchet gear and the cover plate assembly. It transfers the load-bearing retention function from the cover plate/screws to a dedicated component that is specifically designed to handle cantilever loads.
2Reliability
If a thick cover plate is used to prevent deflection under load, then sealing is maintained, but the ratchet head becomes larger and heavier
Solution Approach 1:
The invention separates the sealing function from the load-bearing function. The thin cover plate maintains sealing while the retaining ring independently handles load-bearing retention, eliminating the need for a thick cover plate.
3Stability of the object's composition
If the cover plate retains the ratchet gear under load, then the gear stays in place, but the cover plate deflects and sealing is compromised
Solution Approach 1:
The invention divides the retention function from the sealing function. The retaining ring is specifically designed to retain the ratchet gear under cantilever loads, while the cover plate is dedicated to maintaining the seal, eliminating the conflict between these two functions.
Solution Approach 2:
The retaining ring serves as an intermediary that specifically addresses gear retention under load, allowing the cover plate to focus solely on sealing without being subjected to deflecting loads.
4Volume of moving object
If screws are located close to the yoke/shaft end for compact design, then the ratchet head is more compact, but the cover plate cannot adequately retain the gear under cantilever loads
Solution Approach 1:
The invention separates the compact positioning of screws from the gear retention function. The screws can be positioned optimally for compactness while the retaining ring provides the necessary retention strength independent of screw position.
Data Source
AI summary
A ratchet head uses a radially-locking retaining ring to secure a ratchet gear within the head, reducing the load on a cover plate. The retaining ring opposes off-axis force when the ratchet head is experiencing cantilever-type loads, such that the body of the ratchet head absorbs the force rather than the cover plate enclosing the head. With the ratchet head assembled with the retaining ring opposing off-axis force, rather than the cover plate, the weight and position of the screws securing the cover plate to the body are independent of the maximum torque rating of the head. This also improves the integrity of the seal provided by the cover plate.