Impact Tool Compression Spring Absorbs Reaction Force
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Solution Overview
Problem
Existing impact tools do not effectively reduce reaction forces during hammering operations, leading to increased vibration and potential dislodgment of components, which complicates the design and usage.
Innovation Solution
Incorporating a compression coil spring that absorbs reaction forces by elastically deforming, combined with a cylindrical member that transmits reaction forces to the spring, eliminating the need for additional locking mechanisms and simplifying the structure by integrating the spring and cylinder as a single component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a cushioning member (rubber ring) is disposed between the tool body and impact bolt to reduce reaction force, then the reaction force reduction effect is partially achieved, but the structure becomes more complex and requires additional locking mechanisms
Solution Approach 1:
The patent combines the cushioning member and locking mechanism into a single integrated structure. The cushioning member is disposed between the tool body and impact bolt while simultaneously serving as a locking element, eliminating the need for separate locking mechanisms and reducing overall structural complexity
Solution Approach 2:
The cushioning member is designed to perform multiple functions: it cushions the reaction force during hammering operation and simultaneously prevents the impact bolt from dislodging. This multi-functional design reduces the number of components needed while maintaining both reaction force reduction and structural stability
2Device complexity
If the cylinder is held in the housing part using biasing force from the compression coil spring, then the structure is simplified and locking means are eliminated, but the cylinder may become dislodged during operation
Solution Approach 1:
The compression coil spring is pre-loaded to exert a biasing force on the cylinder before hammering operation begins. This preliminary action ensures the cylinder is firmly held in the housing part, preventing dislodgment during subsequent high-impact operations while maintaining structural simplicity
Solution Approach 2:
The compression coil spring provides a counteracting biasing force that balances the forces attempting to dislodge the cylinder during hammering. This counterforce mechanism reliably retains the cylinder without requiring complex locking structures
3Length of moving object
If the compression coil spring is disposed outside the cylinder, then the axial length of the impact tool is reduced, but the spring requires additional locking mechanisms to prevent movement
Solution Approach 1:
The patent integrates the locking function into the existing cylindrical structure by forming locking grooves on the outer surface of the cylinder that engage with corresponding protrusions on the housing part. This merging of locking functionality with the existing structure eliminates additional locking mechanisms while maintaining compact axial dimensions
Solution Approach 2:
The cylinder's own geometric features (locking grooves and protrusions) provide the locking function, making the system self-locking without requiring external locking mechanisms. This self-service approach maintains compact size while ensuring reliable retention
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 significantly reduces vibration and enhances the effectiveness of reducing reaction forces during hammering, simplifies the tool's structure, and facilitates easier mounting and dismounting of components.
Implementation Method 1
the compression coil spring absorbs a reaction force which is caused by rebound from the workpiece and which acts on the hammer actuating member when the hammer actuating member performs a hammering operation on the workpiece
Data Source
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AI summary
A representative impact tool comprises a tool body (103), a hammer actuating member (145,119), a cylinder (141) and a compression coil spring (171). The compression coil spring (171) contacts the hammer actuating member (145,119) and thereby positions the tool body (103) with respect to the workpiece when the hammer actuating member (145,119) is pressed against the workpiece and pushed rearward in advance of the hammering operation. In such position, the compression coil spring (171) absorbs a reaction force that is caused by rebound from the workpiece and acts upon the hammer actuating member (145,119) when the hammer actuating member (145,119) performs the hammering operation on the workpiece. The cylinder (141) is inserted into the tool body (103) from the front along the axial direction of the hammer actuating member (145,119) and thereby housed within a predetermined housing part of the tool body (103). The compression coil (171) spring applies a biasing force to the cylinder (141) in a rearward direction and thereby holds the cylinder (141) in the housing part.