Oscillating Tool Blade Mount With Simplified Load Transfer

Solution Overview

Problem

The complexity and cost associated with precision fits in typical oscillating power tools, which are necessary for transferring loads from the eccentric bearing to the blade, increase the overall expense and intricacy of the device.

Innovation Solution

An oscillating power tool design featuring a single oscillating member with a tool engagement area that surrounds the oscillating axis and has protruding connecting members for axial mounting of detachable tools, eliminating the need for precision interfaces between the eccentric bearing and the blade, and allowing a simplified load path through the pivot shaft.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If precision fits are used to transfer load from eccentric bearing to blade, then load transfer reliability is improved, but device complexity and manufacturing cost increase

Engineering Contradiction:

Improveload transfer reliabilityVSAvoidmechanism complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The oscillating member combines multiple functions into a single component: it serves as both the oscillating element and the blade holder. The tool engagement area is integrated directly into the oscillating member, eliminating the need for separate precision interfaces between the eccentric bearing and blade mounting structures.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The load transfer path is segmented and redirected through the pivot shaft rather than requiring direct precision fits between the eccentric bearing and blade. The oscillating member acts as an intermediary that transfers oscillation from the eccentric bearing while the pivot shaft handles the primary load transfer to the blade.

Inventive Principle:

Principle #1Segmentation

2Reliability

If precision fits are used to transfer load from eccentric bearing to blade, then load transfer reliability is improved, but manufacturing cost increases

Engineering Contradiction:

Improveload transfer reliabilityVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The oscillating member combines multiple functions into a single component: it serves as both the oscillating element and the blade holder. The tool engagement area is integrated directly into the oscillating member, eliminating the need for separate precision interfaces between the eccentric bearing and blade mounting structures.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The design accepts that the oscillating member and pivot shaft are wear-prone components that may need replacement, but these are simpler, cheaper components compared to precision-fitted blade mounting structures. The focus shifts from creating permanent precision interfaces to using replaceable, easier-to-manufacture parts.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Strength

If traditional oscillating mechanism with separate blade holder is used, then load transfer is effective, but device complexity increases

Engineering Contradiction:

Improveload transfer effectivenessVSAvoidmechanism complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The oscillating member combines multiple functions into a single component: it serves as both the oscillating element and the blade holder. The tool engagement area is integrated directly into the oscillating member, eliminating the need for separate precision interfaces between the eccentric bearing and blade mounting structures.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The pivot shaft acts as an intermediary component that mediates between the oscillating member and the blade. It allows the oscillating member to transfer oscillation while the pivot shaft handles the primary load transfer to the blade, simplifying the overall load path.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 simplifies the oscillating mechanism and blade holder, reducing costs and complexity while maintaining effective load transfer, allowing for a shorter axial length of the pivot axis and enabling easier attachment of various tools.

Implementation Method 1

an eccentric bearing attached to the output shaft; an oscillating member coupled to the eccentric bearing to convert rotational movement of the eccentric bearing into oscillating movement

Methodology Applied

Scientific EffectEccentric mechanism: Eccentric

Data Source

PatentUS20230405793A1An Oscillating Power Tool

Publication Date: 2023.12.21 ROBERT BOSCH GMBH

AI summary

An oscillating power tool includes a housing and a motor at least partially disposed within the housing and having a rotational output shaft. An eccentric bearing is attached to the output shaft. An oscillating member is coupled to the eccentric bearing to convert rotational movement of the eccentric bearing into oscillating movement. A pivot shaft has an oscillating axis and the oscillating member is arranged on it. A tool engagement area is disposed on the oscillating member for engaging a detachable tool. The tool engagement area substantially surrounds the oscillating axis and has protruding tool connecting members extending parallel to the oscillating axis for axial mounting of the detachable tool to the tool engagement area.