Impact Tool Resistor for Stable No-Load Striking
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Solution Overview
Problem
Existing impact tools face instability in their no-load striking prevention function due to the abrasion and deterioration of elastic materials used for movement restriction, leading to reduced resistance and effectiveness.
Innovation Solution
The impact tool incorporates a metallic resistor with a taper shape and a C-shaped leaf spring biasing member to apply resistance to the intermediate element and tip tool in a non-striking state, eliminating the need for elastic materials and enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an elastic body (O-ring) is used to restrict the movement of the intermediate element, then the no-load striking prevention function is provided, but the elastic body is abraded or deteriorated by repeating contact, reducing resistive power and stability
Solution Approach 1:
The patent replaces the elastic body (O-ring) with a resistor made of metal or other wear-resistant material. The resistor is biased by a biasing member (such as a spring) to contact the intermediate element and apply resistance to its movement. This substitution eliminates the abrasion and deterioration problems of elastic bodies while maintaining the no-load striking prevention function through the biasing mechanism that ensures continuous contact pressure.
2Force
If a locking O-ring is engaged with a circular cone to apply resistance, then movement restriction is achieved, but the O-ring deteriorates from repeated contact reducing its resistive power
Solution Approach 1:
The patent changes the material parameter of the resistor from elastic material (O-ring) to metal or wear-resistant material, which does not deteriorate from repeated contact. The biasing member maintains a constant biasing force on the resistor, ensuring that the resistive power remains consistent throughout the service life of the tool, eliminating the degradation issue of elastic bodies.
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
This configuration ensures stable no-load striking prevention by reducing momentum and preventing bounce, while improving durability and maintaining effective movement restriction without material degradation.
Implementation Method 1
The biasing member is disposed on the tool holder. The biasing member biases the resistor toward at least one of the intermediate element and the tip tool
Data Source
AI summary
An impact tool includes a tubular tool holder, a hammering mechanism, a resistor, and a biasing member. An impact element moves forward and rearward in conjunction with a piston. An intermediate element is housed movable back and forth between the impact element and a tip tool. The intermediate element abuts on a rear end of the tip tool to indirectly transmit a striking force from the impact element to the tip tool in a normal striking. The resistor is configured to abut on at least one of the intermediate element and the tip tool to apply a resistance to a front-rear movement of at least one of the intermediate element and the tip tool in a non-striking state. The biasing member disposed on the tool holder biases the resistor to a side of at least one of the intermediate element and the tip tool.