Impact Driver Bit Shank With Variable Rings

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Solution Overview

Problem

Bits used with impact drivers wear out quickly, necessitating frequent replacements and reducing their lifespan.

Innovation Solution

The design incorporates a shank with a set of rings that vary in width and gap distance from the head portion to the drive portion, creating a pulsating action that distributes torsion, thereby enhancing the bit's durability and performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If standard bits are used with impact drivers, then torque is applied to fasteners, but the bits wear out quickly and have short lifespan

Engineering Contradiction:

Improvebit durabilityVSAvoidbit lifespan

Core Design Contradiction:

StrengthVSDuration of action of moving object

Solution Approach 1:

The shank is segmented into multiple sections with varying diameters, creating a stepped configuration. This segmentation allows different sections to flex independently under torsional load, distributing stress more evenly throughout the bit structure and preventing concentrated wear at any single point.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different sections of the shank have different diameters to create varying flexibility characteristics. The smaller diameter sections provide greater flexibility and stress distribution, while larger diameter sections maintain structural integrity. This local variation in geometry optimizes the balance between strength and stress distribution throughout the bit.

Inventive Principle:

Principle #3Local quality

2Productivity

If bits are designed for high torque application, then fastening efficiency improves, but torsional stress concentrates and reduces bit lifespan

Engineering Contradiction:

Improvefastening efficiencyVSAvoidbit reliability under torsion

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The stepped shank design creates a dynamic response to torsional loads, where different sections flex by different amounts. This dynamic flexibility allows the bit to absorb and distribute torsional stress throughout its length rather than concentrating it at weak points, maintaining reliability during high-torque fastening operations.

Inventive Principle:

Principle #15Dynamics

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This configuration allows the bits to be used 20-30 times longer than standard bits, improving their lifespan and efficiency in applying torque.

Implementation Method 1

Advantageously, such variable widths of the gaps between adjacent rings of the set and the increase of the width of each gap depending on its distance from the head portion creates a pulsating action when the bit is used, which works to distribute torsion in the bit.

Methodology Applied

Scientific EffectPulsating action: Vibration

Data Source

PatentUS11839956B2Bit

Publication Date: 2023.12.12 CORE TOOL GRP INC

AI summary

Various embodiments of bits are described having a drive portion, a shank and a head portion or tip. The shank can comprise a set of raised rings that extend from an outer surface of the shank. The rings are spaced apart along the shank starting from the head portion, and preferably have different distances between at least two adjacent pairs of rings.