Impact Tool Anvil Nesting for Compact Operability

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Solution Overview

Problem

Existing impact tools face challenges in maintaining operability while minimizing size increase.

Innovation Solution

The impact tool design includes a motor, a spindle, a hammer, a ball, and an anvil, where the spindle is located frontward from the motor, and the anvil is received in a support hole extending rearward from the spindle, allowing for a compact configuration without increasing the tool's size.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the anvil is positioned with its rear end forward of the ball, then the impact tool achieves better operational performance, but the tool size increases significantly

Engineering Contradiction:

Improveoperational performanceVSAvoidtool size

Core Design Contradiction:

ReliabilityVSLength of moving object

Solution Approach 1:

The anvil is nested within the support hole of the spindle, with the rear end of the anvil positioned forward of the ball. This nested configuration allows the anvil to be received inside the spindle structure, minimizing the overall tool length while maintaining the required operational performance for impact operations

Inventive Principle:

Principle #7Nested doll (Nesting)

2Length of moving object

If the anvil is received in the support hole of the spindle, then the tool size is minimized, but the structural complexity increases

Engineering Contradiction:

Improvetool sizeVSAvoidstructural complexity

Core Design Contradiction:

Length of moving objectVSDevice complexity

Solution Approach 1:

The spindle serves multiple functions: it supports the anvil within its support hole, positions the ball for impact operations, and transmits rotational motion from the motor. This multi-functional design minimizes the number of separate components needed, reducing structural complexity while achieving compact tool dimensions

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 design maintains operability while minimizing the overall size of the impact tool, enhancing usability and efficiency.

Implementation Method 1

a motor; a spindle located frontward from the motor and rotatable by the motor

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

a hammer supported by the spindle; an anvil received in the support hole and strikable by the hammer in a rotation direction

Methodology Applied

Scientific EffectImpact force: Impact Force

Implementation Method 3

a ball between the spindle and the hammer

Methodology Applied

Scientific EffectBall bearing: Ball Bearing

Data Source

PatentUS12427637B2Impact tool

Publication Date: 2025.09.30 MAKITA CORP

AI summary

To reduce size increase, an impact tool includes a motor, a spindle located frontward from the motor, rotatable by the motor, and having a support hole extending rearward from a front end of the spindle, a hammer supported by the spindle, a ball between the spindle and the hammer, and an anvil received in the support hole and strikable by the hammer in a rotation direction. The anvil has a rear end located rearward from the ball.