Multitool Locking Multipurpose Driver for Centered Shaft Operation

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Solution Overview

Problem

Existing multitools suffer from unintentional movement of screwdriver shafts and bits during use, lack of centering with respect to the axis of rotation, and potential accidental opening of handles, leading to inefficiency and safety hazards.

Innovation Solution

A multitool design with a driver component base and tool shaft that interlocks with complementary profiles on the handles, featuring a locking mechanism to secure the handles together and center the shaft with respect to the axis of rotation, allowing for efficient and safe operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the screwdriver shaft is pivotably attached to the handle to allow movement, then the tool can be folded and stored compactly, but the shaft may move or close unintentionally while in use

Engineering Contradiction:

Improvefolding capabilityVSAvoidshaft position stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

A locking mechanism acts as an intermediary between the shaft and handle, engaging to prevent unintentional movement during use while allowing the shaft to remain pivotably attached for compact storage when not in use

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If the shaft is allowed to pivot for storage, then the tool can be folded compactly, but the shaft and bits are not centered with respect to the intended axis of rotation

Engineering Contradiction:

Improvestorage configurationVSAvoidcentering alignment

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The shaft transitions between two dynamic states: a folded position for compact storage and a locked position for centered alignment during operation, with the locking mechanism enabling reliable transition between these states

Inventive Principle:

Principle #15Dynamics

3Ease of operation

If the handles can open freely for tool access, then the user can easily access different tools, but the handle may become open during use exposing the user's hands to be pinched

Engineering Contradiction:

Improvetool accessVSAvoidpinch hazard

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

A handle locking mechanism serves as an intermediary safety feature that can engage to prevent accidental opening during use, while still allowing intentional opening for tool access when needed

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12434354B2Multitool with locking multipurpose driver

Publication Date: 2025.10.07 GRUBB JOSEPH M

AI summary

First and second handles 18 and 20 extend from first and second plier parts 24 and 26 with a tool shaft 14 disposed on the handle 20 and extending outward of a pivot at 34 and stows into the outer side of the handle 20. The base 42 of the tool shaft 14 has a mating profile 80 which engages a complimentary mating profile 48 disposed on the pivot at 32 or at a complimentary mating profile 48 in an accessory tool 50. The tool shaft 14 is locked in place by closing the two handles 18 and 20 and engaging the handle locking mechanism 30, and extends from a center of the two handles 18 and 20 when closed.