Selective Tool Head Gear Engagement for Manual Cutting Control

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Solution Overview

Problem

Existing cutting tools, such as shears and loppers, require varying amounts of force and repetitive motion to cut different thicknesses and densities of materials, and often rely on complex electronic control mechanisms that can be risky, complex, and prone to malfunction.

Innovation Solution

A tool with a mechanical release mechanism that allows manual selective engagement and disengagement of the tool head, using a handle-operated linkage and gear system to apply and release force, eliminating the need for electronic controls and enabling efficient cutting and repositioning.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If electronic control mechanisms are used to control tool head engagement, then automation and productivity are improved, but device complexity and reliability worsen due to potential malfunctions and risks

Engineering Contradiction:

Improveautomation of tool head engagementVSAvoidcomplexity of control mechanisms

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent replaces electronic control mechanisms with a purely mechanical linkage system. The linkage system includes a linkage member connected to the handle and a gear assembly that mechanically translates handle movement into tool head engagement and disengagement actions, eliminating electronics entirely while maintaining automated operation through mechanical advantage and gear ratios

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The tool head engagement and disengagement system is designed to be self-actuating through the mechanical linkage. When the user moves the handle, the linkage automatically translates this motion to engage or disengage the tool head without requiring separate control systems, sensors, or electronic components. The system serves itself through inherent mechanical coupling

Inventive Principle:

Principle #25Self-service

2Ease of operation

If electronic control mechanisms are used for tool head engagement, then operational precision is improved, but reliability worsens due to susceptibility to malfunction

Engineering Contradiction:

Improveprecision of tool head engagementVSAvoidresistance to malfunction

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent eliminates electronic control systems and replaces them with a mechanical linkage system that provides precise control through gear ratios and mechanical advantage. The linkage member and gear assembly ensure accurate tool head engagement and disengagement positions through inherent mechanical constraints, while the absence of electronics removes all susceptibility to electronic malfunctions, sensor failures, or software errors

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The mechanical linkage system uses simple, robust components that are inherently more reliable than electronic systems. The gear assembly and linkage members are designed as durable mechanical elements that can withstand repeated use without degradation from environmental factors, electrical interference, or component failure modes associated with electronics

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Productivity

If complex electronic control mechanisms are used, then automation is improved, but ease of manufacture and repair worsen

Engineering Contradiction:

Improveautomated tool head controlVSAvoidmanufacturing complexity

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The patent replaces complex electronic control systems with a mechanical linkage system consisting of a linkage member, gear assembly, and handle mechanism. These components can be manufactured using traditional machining and assembly processes, avoiding the need for electronic component sourcing, circuit board fabrication, software programming, and electronic testing procedures

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The mechanical linkage system is divided into discrete, modular components including the linkage member, gear assembly, handle, and tool head mounting mechanisms. Each component can be manufactured independently using standard machining processes and then assembled through simple mechanical connections, facilitating easier manufacturing, quality control, and repair compared to integrated electronic systems

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20240066729A1Tool with selectively engagable tool head

Publication Date: 2024.02.29 TECHTRONIC CORDLESS GP

AI summary

A tool is provided, the tool including a handle, a tool head, a first gear, a compound gear, a shaft, and an actuating member coupled to the shaft. The handle extends along a longitudinal direction. The tool head is configured to receive a motive force to selectively engage or disengage the tool head. The first gear is operably coupled to the tool head. The compound gear is selectively coupled to the first gear. The shaft extends through the compound gear and is affixed to the shaft. The actuating member is coupled to the handle. Movement of the actuating member along the longitudinal direction selectively engages or disengages the compound gear and the first gear.