Chisel Hammer Impact Assembly With Quick-Connect Sealed Anvil
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Solution Overview
Problem
Existing chisel hammers often lack efficient mechanisms for imparting axial impacts to tool bits, and they do not provide easy and secure ways to change tool bits during operation.
Innovation Solution
A power tool with a reciprocation drive assembly and an impact mechanism that converts motor torque into axial impacts, featuring a quick-connect mechanism for tool bit replacement and a design that minimizes debris entry through a sealed anvil structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a reciprocation drive assembly is used to convert motor torque to axial impacts, then the impact efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent replaces traditional pneumatic or hydraulic impact mechanisms with an electric motor-driven reciprocation system. The electric motor converts electrical energy directly to mechanical reciprocating motion through a drive assembly, eliminating the need for compressors, tanks, and complex fluid control systems while maintaining high impact efficiency
Solution Approach 2:
The reciprocation drive assembly creates dynamic reciprocating motion of the piston and striker components. The system transitions between static and dynamic states, with the piston moving back and forth along the barrel axis to generate controlled impacts, optimizing both efficiency and responsiveness
2Ease of operation
If a quick-connect mechanism is implemented for tool bit replacement, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The tool holder is segmented into modular components including a quick-connect mechanism with movable and fixed portions. This segmentation allows the tool bit to be quickly attached and detached without requiring complex tools or procedures, while the modular design keeps each component relatively simple in structure
Solution Approach 2:
The quick-connect mechanism is pre-configured with alignment features and engagement surfaces that guide the tool bit into the correct position during attachment. This preliminary preparation of the connection interface enables rapid tool bit replacement without requiring complex adjustment or alignment procedures during the replacement operation
3Reliability
If the anvil is sealed to minimize debris entry, then the reliability is improved, but the ease of manufacture worsens
Solution Approach 1:
The anvil incorporates sealed surfaces and sealing structures that prevent debris from entering the barrel and striker assembly. These seals create protective barriers while maintaining the functional geometry of the anvil, balancing manufacturing feasibility with improved reliability
Solution Approach 2:
The sealing function is extracted as a distinct feature of the anvil design, with sealed surfaces and sealing structures that can be manufactured separately or integrated into the anvil body. This extraction allows the sealing requirement to be addressed through specific manufacturing processes without fundamentally redesigning the entire anvil structure
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 power tool efficiently imparts axial impacts to tool bits, reduces debris ingress, and facilitates quick and secure tool bit changes, enhancing operational efficiency and reliability.
Implementation Method 1
an electric motor that is supported in the motor housing portion and defines a motor axis
Implementation Method 2
a reciprocation drive assembly coupled to the electric motor and configured to convert torque from the electric motor to reciprocating motion of a piston received within the barrel for reciprocation therein along the barrel axis
Implementation Method 3
a striker received within the barrel for reciprocation in response to reciprocation of the piston and an anvil at least partially received within the barrel and positioned between the striker and tool bit. The anvil is configured to communicate axial impacts to the tool bit in response to reciprocation of the striker
Data Source
AI summary
A power tool adapted to impart axial impacts to a tool bit includes a housing having a motor housing portion and a handle portion extending transversely from the motor housing portion, an electric motor supported in the motor housing portion and defining a motor axis, a non-rotatable barrel extending from the motor housing portion and defining a barrel axis parallel to the motor axis, a reciprocation drive assembly coupled to the electric motor and configured to convert torque from the electric motor to reciprocating motion of a piston received within the barrel for reciprocation therein along the barrel axis, a striker received within the barrel for reciprocation in response to the reciprocation of the piston, and an anvil at least partially received within the barrel and positioned between the striker and tool bit.The anvil communicates axial impacts to the tool bit in response to reciprocation of the striker.