Ratchet Socket Hexagonal Inner Periphery Edge-Edge Contact
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Solution Overview
Problem
Conventional ratchet sockets suffer from slipping issues due to a larger gap between the tool slot and lock unit, leading to potential damage and reduced durability, and are limited in fitting normal screws and durability due to stepped-shaped driving portions and uniform connecting edges.
Innovation Solution
A ratchet socket design featuring a polygonal cross-section with ratchet teeth, a hexagonal inner periphery, and inclined surfaces and abutting portions that provide edge-edge contact and engage with screw heads to prevent damage and enhance reliability, allowing for effective screwing and unscrewing in both directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the inner diameter of the tool slot is manufactured larger than the indicated size to easily engage with the lock unit, then the ease of operation is improved, but the gap between the tool slot and head portion increases causing slipping and damage
Solution Approach 1:
The inner periphery is segmented into multiple connecting portions with driving portions, creating multiple contact points between the tool slot and screw head. This segmentation allows for precise engagement without requiring excessive clearance, eliminating the slipping problem while maintaining ease of operation.
Solution Approach 2:
The connecting portions have different wall thicknesses at different locations (thinner at driving portions, thicker at other portions). This local variation in geometry allows the tool to easily engage while maintaining structural integrity and preventing slipping at critical contact points.
2Reliability
If stepped-shaped driving portions are formed to enable rotation in one direction, then the reliability for preventing reverse rotation is improved, but the adaptability to fit normal screws is reduced
Solution Approach 1:
The connecting portions feature asymmetric wall thickness distribution with thinner sections at driving portions. This asymmetric design enables reliable one-way rotation control while maintaining compatibility with normal screw heads through the hexagonal overall geometry and appropriate contact surface design.
3Ease of operation
If the wall thickness of connecting portions is reduced to form driving portions, then the ease of operation is improved, but the durability under torsion load is reduced causing wear and fracture
Solution Approach 1:
The connecting portions have non-uniform wall thickness with thinner sections at driving portions for ease of torque application and thicker sections at other portions for structural strength. This local quality variation resolves the contradiction between operational ease and durability under torsion load.
Solution Approach 2:
The connecting portions are segmented into different functional zones with varying wall thicknesses. The thinner driving portions facilitate torque application while the thicker portions provide structural support, distributing stress and preventing fracture.
Data Source
AI summary
A ratchet socket may include a main body, and an outer periphery of the main body has ratchet teeth formed in an endless circular pattern to form the main body with a polygonal cross section. The main body comprises a hexagonal inner periphery to form six internal angles and six inner edges. Each of the inner edges has an engaging portion at a middle portion thereof, and each of the inner edges comprises two abutting portions at two sides of the engaging portion between the engaging portion and each of two adjacent internal angles. Each of two recess portions is formed between the engaging portion and the abutting portion to form two engaging teeth on two lateral edges of the engaging portion. Each of the internal angles is curved to form an inclined surface between the abutting portion and the adjacent internal angle.