Friction-Fit Wood Chisel Blade Retention Mechanism

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Solution Overview

Problem

Existing wood chisels with removable blades often require auxiliary tools for mounting and detaching, which complicates the process and may not ensure secure fixation of the blade.

Innovation Solution

A wood chisel design featuring a first and second profiled part with a removable blade held by friction, allowing for easy insertion and secure attachment without additional tools, utilizing a core and locking mechanism to reinforce the tool and ensure the blade's stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a removable blade design is used, then blade changing is enabled, but additional tools are required for mounting and detaching

Engineering Contradiction:

Improveblade changing capabilityVSAvoidtool requirement

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The blade is designed with a friction-fit mechanism that allows it to be inserted and secured directly into the tool body without requiring additional mounting tools. The blade's geometry and material properties enable self-retention through friction, eliminating the need for separate fastening operations.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The tool is divided into separable components (tool body and blade) that can be independently replaced. The blade can be removed and replaced by simply pulling it out and inserting a new one, with each component optimized for its specific function.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If a removable blade design is used, then blade replacement is possible, but secure fixation of the blade is compromised

Engineering Contradiction:

Improveblade replaceabilityVSAvoidblade fixation security

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The friction fit mechanism utilizes controlled friction between the blade and tool body surfaces. By optimizing the contact area, surface roughness, and material properties, the design achieves sufficient friction force to securely hold the blade during use while still allowing easy removal when needed.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The blade and tool body features curved or tapered surfaces that create a wedging effect during insertion. This geometric configuration increases the normal force between contact surfaces, thereby enhancing friction and securing the blade firmly in position.

Inventive Principle:

Principle #14Spheroidality (Curvature)

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

Enables quick and simple blade changes without tools, ensuring the blade is securely held, improving user convenience and tool durability.

Implementation Method 1

the removable blade can be inserted between said first and second profiled parts and be held therein by friction

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS9095967B2Wood chisel and blade for a wood chisel

Publication Date: 2015.08.04 SAMVAZ

AI summary

A tool, in particular a wood chisel, includes a first profiled part (100; 1), a second profiled part (103; 10, 14) and a removable blade (106; 20). The second profiled part (103; 10, 14) is pushed into the first profiled part such that the removable blade can be inserted between the first and second profiled parts (100; 1; 103; 10, 14) and be held therein by friction.