Socket Engaging Structure with Arcuate Faces

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Solution Overview

Problem

Conventional socket structures wear out screw heads due to sharp stop ribs, leading to bite marks and reduced rotational torque.

Innovation Solution

An engaging structure with a main body featuring a first face with a larger area for primary driving, recesses that align with screw corners to prevent wear, and specific angles and recesses for efficient torque application.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Force

If sharp stop ribs are used to engage screw heads, then the engaging structure can apply rotational force, but the stop ribs easily wear and cause bite marks on the screw heads

Engineering Contradiction:

Improverotational torqueVSAvoidbite marks and wear on screw heads

Core Design Contradiction:

ForceVSObject-affected harmful factors

Solution Approach 1:

The patent replaces sharp stop ribs with arcuate driving portions that have curved surfaces. These curved surfaces contact the screw head faces over a larger area, distributing the rotational force and preventing concentrated stress that causes bite marks and wear.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The patent changes the geometric parameters of the engaging structure by providing driving portions with specific arcuate shapes and larger contact areas. This parameter change transforms the interaction from point-contact (sharp ribs) to surface-contact (arcuate portions), reducing stress concentration and wear.

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If sharp stop ribs with six lines contact the screw head, then the structure is simple, but the rotational torque applied on the screw head is decreased

Engineering Contradiction:

Improvestructure simplicityVSAvoidrotational torque

Core Design Contradiction:

Device complexityVSForce

Solution Approach 1:

The patent applies local quality by providing different types of driving portions (arcuate faces and arcuate edges) at different locations within the engaging structure. These localized features increase the contact area with the screw head, thereby increasing rotational torque without significantly increasing overall structural complexity.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20250162109A1Engaging structure for hand tool

Publication Date: 2025.05.22 LEE TSAN CHANG

AI summary

An engaging structure includes a main body having a first side, a second side, a third side, and a fourth side. The first side is provided with a first face and a first recess. A vertical line passes the first face. The first recess is provided with a first arcuate face and a second arcuate face. The second side is provided with a second recess, a second face, and a third recess. The second recess is situated at a left side of the vertical line which passes the second face. The fourth side is provided with a fourth recess that is close to the third recess. A first angle is defined between the first side and the third side. A second angle is defined between the second side and the fourth side. A fifth recess is defined between the third side and the fourth side.