Transverse Axis Rotary Hammer Impact Mechanism

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Solution Overview

Problem

Conventional rotary hammers require additional adaptors or end effectors for transverse drilling, leading to energy losses and reduced tool performance due to the inefficient transfer of rotational motion and axial impacts.

Innovation Solution

The rotary hammer design features a spindle axis oriented transversely to the handle axis, allowing for improved ergonomics and force application, and includes an impact mechanism with a piston and striker that reciprocate to impart axial impacts to the tool bit, enhancing energy transfer efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional rotary hammers use a longitudinal spindle axis, then the structure is simple, but additional adaptors are required for transverse drilling causing energy losses and reduced performance

Engineering Contradiction:

Improvetransverse drilling capabilityVSAvoidenergy loss in motion transfer

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The patent inverts the conventional spindle orientation by positioning the spindle axis transversely rather than longitudinally. This allows the rotary hammer to perform transverse drilling directly without requiring additional adaptors, thereby eliminating the energy losses associated with multi-stage motion transfer while maintaining structural simplicity.

Inventive Principle:

Principle #13The other way round (Inversion)

2Adaptability or versatility

If conventional rotary hammers require additional adaptors for transverse drilling, then adaptability is improved, but device complexity increases and tool performance decreases

Engineering Contradiction:

Improvetransverse drilling capabilityVSAvoidnumber of components

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

By inverting the spindle axis orientation to transverse, the patent eliminates the need for additional adaptors that would otherwise be required for transverse drilling. This reduces device complexity while maintaining versatility, as the rotary hammer can now perform both longitudinal and transverse drilling operations with a single configuration.

Inventive Principle:

Principle #13The other way round (Inversion)

3Ease of manufacture

If conventional rotary hammers use longitudinal spindle orientation, then manufacturing is simple, but force application efficiency is reduced

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidforce application efficiency

Core Design Contradiction:

Ease of manufactureVSForce

Solution Approach 1:

The patent applies the inversion principle by orienting the spindle axis transversely, which improves force application efficiency during drilling operations. The transverse orientation allows for more direct and efficient force transmission from the impact mechanism to the tool bit, enhancing overall drilling performance while remaining manufacturable.

Inventive Principle:

Principle #13The other way round (Inversion)

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 improves ergonomics and efficiency in drilling applications by allowing for direct transverse drilling without the need for additional adaptors, resulting in better tool performance and reduced energy losses.

Implementation Method 1

an impact mechanism including a piston at least partially received within the spindle for reciprocation therein, and a striker received within the spindle for reciprocation in response to reciprocation of the piston

Methodology Applied

Scientific EffectReciprocating motion conversion:

Implementation Method 2

the oscillation mechanism is a wobble assembly having wobble bearing that is rotated by an intermediate shaft of a transmission that transmits torque from the motor to the spindle

Methodology Applied

Scientific EffectWobble assembly motion conversion:

Data Source

PatentUS20250058446A1Transverse axis rotary hammer

Publication Date: 2025.02.20 MILWAUKEE ELECTRIC TOOL CORP

AI summary

Some aspects of the disclosure provide a rotary hammer that is configured to impart impacts to a tool bit. The rotary hammer includes a housing, a motor disposed within the housing, a spindle, and an impact mechanism. The housing includes a first end that can have a handle and a second end that are configured to receive the tool bit. The housing extends along a direct direction between the first and second end. The spindle is disposed within the housing and rotatable by the motor. The spindle defines a spindle axis that is transverse relative to the first direction. The impact mechanism includes a piston and a striker. The piston is at least partially received within the spring for reciprocation therein. The striker is received within the spindle for reciprocation in response to reciprocation of the piston.