Striker-Controlled Pneumatic Air Spring for Hand-Held Power Tools
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Solution Overview
Problem
Existing hand-held percussion tools with pneumatic percussion mechanisms have complex and costly air spring control systems, requiring numerous components and increasing device weight and manufacturing costs.
Innovation Solution
The air spring is directly controlled via a striker that acts as a shut-off body, simplifying the control mechanism and reducing the number of components, with a pot-shaped striker and seals to manage ventilation openings, allowing for reduced length and weight while enabling precise control of the air spring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex air spring control system with multiple components is used, then the air spring can be controlled reliably, but the device weight and manufacturing costs increase
Solution Approach 1:
The control function for the air spring is merged into the striker itself. The striker is designed with an integrated control element that directly controls the ventilation openings of the air spring, eliminating the need for separate control components. This integration maintains reliable control while significantly reducing device weight and component count.
Solution Approach 2:
The striker is given multiple functions: it serves as both the impact tool that strikes the workpiece and the control element that regulates the air spring. By making the striker universal, the patent eliminates dedicated control components, reducing overall device weight while maintaining functional reliability.
2Reliability
If a complex air spring control system with multiple components is used, then the air spring can be controlled reliably, but manufacturing costs increase
Solution Approach 1:
The control function for the air spring is merged into the striker itself. The striker is designed with an integrated control element that directly controls the ventilation openings of the air spring, eliminating the need for separate control components. This integration maintains reliable control while significantly reducing device weight and component count.
Solution Approach 2:
The striker is given multiple functions: it serves as both the impact tool that strikes the workpiece and the control element that regulates the air spring. By making the striker universal, the patent eliminates dedicated control components, reducing overall device weight while maintaining functional reliability.
3Weight of moving object
If the striker is designed with integrated air spring control, then the number of components and device weight are reduced, but the control mechanism must be simplified
Solution Approach 1:
The control function for the air spring is merged into the striker itself. The striker is designed with an integrated control element that directly controls the ventilation openings of the air spring, eliminating the need for separate control components. This integration maintains reliable control while significantly reducing device weight and component count.
4Volume of stationary object
If the striker directly controls the air spring, then the space required and manufacturing costs are reduced, but the valve control mechanism must be simplified
Solution Approach 1:
The control function for the air spring is merged into the striker itself. The striker is designed with an integrated control element that directly controls the ventilation openings of the air spring, eliminating the need for separate control components. This integration maintains reliable control while significantly reducing device weight and component count.
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 solution simplifies air spring control, reduces device weight and manufacturing costs, and allows for adjustable impact power based on the force applied to a workpiece, enhancing operational efficiency and reliability.
Implementation Method 1
an air spring (25) which can be switched on and off and which, when switched on, stores energy elastically
Implementation Method 2
the striker (24) forms a shut-off body of a valve (26) that controls the air spring (25)
Implementation Method 3
a first seal (27) of the valve (26) is provided between the guide tube (21) and the valve section (36)
Data Source
Figure 1
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AI summary
The invention relates to a hand-held power tool with a pneumatic impact mechanism (20) driven by a motor, comprising an exciter element (22) movable back and forth in a guide tube (21), a striking piston (23) movably guided in the guide tube (21) and driven by an air spring (25) via the exciter element (22), which acts on a striker (24), wherein the air spring (25) can be switched on and off. To improve such a hand-held power tool, the air spring (25) can be switched on and off directly via the striker (24).