Segmented Tool Housing Machining for Internal Undercut Access

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Solution Overview

Problem

Existing tool housings, particularly those for power ratchet wrenches, are difficult to machine due to the need to access the inside of the housing, especially the undercut near the crank shaft, which requires specialty tools as the housing length increases.

Innovation Solution

A multi-piece tool housing comprising an upper, middle, and lower housing, where the upper and middle housings are fully machined and coupled, and the lower housing is partially machined initially, then coupled and fully machined later, allowing for easier alignment and machining without requiring specialty tools.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If the housing is made as a single piece or in fewer pieces, then the structural integrity and simplicity are improved, but the difficulty of machining increases due to limited access to internal features

Engineering Contradiction:

Improvestructural integrityVSAvoidmachining difficulty

Core Design Contradiction:

Stability of the object's compositionVSEase of manufacture

Solution Approach 1:

The housing is divided into multiple separate pieces (first housing piece, second housing piece, third housing piece) that can be machined independently with full tool access, then assembled together to form the complete housing structure

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If the housing is made longer to accommodate additional components, then the functionality is improved, but the machining difficulty increases due to reduced tool access

Engineering Contradiction:

ImprovefunctionalityVSAvoidmachining difficulty

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The extended housing is segmented into multiple pieces along its length, allowing each segment to be machined separately with adequate tool access, then assembled to achieve the total required length for accommodating additional components

Inventive Principle:

Principle #1Segmentation

3Ease of manufacture

If specialty tools are used to machine the undercut, then the machining capability is improved, but the device complexity and cost increase

Engineering Contradiction:

Improvemachining capabilityVSAvoidtool complexity

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

By dividing the housing into separate machinable pieces, conventional tools can access and machine features like undercuts on each individual piece without requiring complex specialty tools, reducing overall device complexity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The housing pieces are machined separately with all necessary features (including undercuts) created before assembly, eliminating the need for specialized post-assembly machining tools

Inventive Principle:

Principle #10Preliminary action

4Ease of manufacture

If the housing portions are machined separately and then assembled, then the machining ease is improved, but the alignment precision may deteriorate

Engineering Contradiction:

Improvemachining easeVSAvoidalignment precision

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The housing is segmented into separate pieces that are machined independently with standard tools, then assembled using alignment features to achieve precise positioning

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Mechanical alignment features (such as ribs fitting into grooves or keyed interfaces) replace complex alignment procedures, ensuring precise positioning of housing pieces during assembly

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS12337457B2Tool housing and method for making the same

Publication Date: 2025.06.24 SNAP ON INC

AI summary

A tool housing and method for making the same are disclosed. The tool housing can include upper and middle portions that are fully machined and coupled to one another. The tool housing can also include a lower housing that is partially machined, coupled to the remaining housing portions, and then fully machined. In doing so, the machining operation is eased and the portions of the housing are better aligned with one another.