Lever Axe Head Torsion Spring Torque Absorption
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Solution Overview
Problem
Lever axes cause discomfort and injury to users due to the twisting torque absorbed by the wrist when striking materials, reducing the effectiveness of the splitting action.
Innovation Solution
Incorporating a torsion spring between the axe head and handle to absorb and minimize the twisting torque, allowing more mechanical energy to be directed towards splitting the material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a lever axe head with offset mass is used to generate torque for splitting wood, then the splitting effectiveness is improved, but the twisting torque transmitted to the user's wrist increases causing discomfort and injury
Solution Approach 1:
A spring element is introduced as an intermediary component between the axe head and handle. This spring absorbs and attenuates the twisting torque generated by the offset mass during striking, preventing full transmission to the user's wrist while maintaining the torque-generating function for wood splitting.
Solution Approach 2:
The spring element is pre-installed in the axe structure to provide cushioning before the harmful torque reaches the user. This beforehand cushioning mechanism reduces the shock and twisting torque during impact, protecting the user's wrist from injury while preserving the splitting effectiveness.
2Power
If the axe head is designed to generate high torque through offset mass, then more mechanical energy is available for splitting, but more torque is absorbed by the user's wrist reducing operational comfort
Solution Approach 1:
The spring element serves as a mediator that decouples the power generation mechanism (offset mass) from the user's body. It allows the full mechanical energy to be generated for splitting while filtering out the harmful torque components that would otherwise be transmitted to the user's wrist.
Solution Approach 2:
The spring provides preemptive cushioning that protects the user from torque absorption issues before they occur during operation. This enables the user to operate the axe with high power output without experiencing wrist discomfort or injury.
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
The solution reduces user discomfort and injury while increasing the axe's effectiveness in splitting wood by minimizing torque transmission to the wrist, ensuring a more efficient striking action.
Implementation Method 1
one or more springs disposed between the first portion of the handle and the lever axe head for biasing the lever axe head and handle relative to each other such that first portion of the handle and the lever axe head rotate relative to each other to absorb at least a portion of the generated torque
Data Source
AI summary
An axe including: a lever axe head having a cutting edge, the lever axe head being configured to generate a torque and to rotate upon one of the cutting edge striking a material and the cutting edge penetrating a predetermined distance into the material; a handle having a first portion attached to the lever axe head and a second portion to be gripped by a user; and one or more springs disposed between the first portion of the handle and the lever axe head for biasing the lever axe head and handle relative to each other such that first portion of the handle and the lever axe head rotate relative to each other to absorb at least a portion of the generated torque from being transmitted to the user.