Combustion-Powered Placing Tool Dual Ignition Mode Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Combustion-powered setting tools face challenges in efficiently driving fastening elements into substrates due to limitations in power control and fault handling, particularly in achieving precise pressure and ignition control for effective operation across various substrate types.
Innovation Solution
The tool incorporates a selector device for switching between low-power and high-power modes, a control device with sensors for precise ignition control, a reset device for automatic piston return, and an air bleed valve for pressure equalization, enabling flexible operation and fault handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single ignition device in the main combustion chamber is used, then the device structure is simple, but the power control and adaptability to different substrates are limited
Solution Approach 1:
The combustion system is segmented into two separate combustion chambers: a prechamber (25) with a first ignition device (26) and a main combustion chamber (6) with a second ignition device (76). This segmentation allows independent control of ignition timing and power levels, enabling adaptation to different substrate types while maintaining manageable structural complexity through modular design.
Solution Approach 2:
The system implements dynamic power control by selectively activating either the prechamber ignition device or the main combustion chamber ignition device based on substrate requirements. The selector device (81) enables dynamic switching between different ignition configurations, providing adaptable power output for various fastening applications.
2Measurement precision
If precise pressure and ignition control is implemented with multiple sensors and control devices, then the operation precision is improved, but the device complexity increases
Solution Approach 1:
Sensor devices (106, 107) are integrated to detect pressure, temperature, and position parameters in both the prechamber and main combustion chamber. The control device (105) processes this feedback information to precisely control ignition timing and power delivery, achieving accurate operation while managing complexity through electronic control systems.
Solution Approach 2:
The control device (105) serves multiple functions: it controls the selector device for ignition mode selection, manages the reset device for piston positioning, and coordinates the air bleed valve for pressure control. This multi-functionality reduces the need for separate dedicated control components for each function.
3Volume of moving object
If the driving piston is completely retracted in initial position for compact design, then the device size is reduced, but the power delivery effectiveness is compromised
Solution Approach 1:
The prechamber (25) is used to perform preliminary combustion action before the main power delivery phase. By igniting the fuel/air mixture in the prechamber first, pressure is built up that then transfers to the main combustion chamber, enabling effective power delivery while maintaining a compact piston retraction volume.
Solution Approach 2:
The prechamber (25) is nested within or adjacent to the main combustion chamber (6) structure. This nested arrangement allows the prechamber to function as a power amplification stage without significantly increasing the overall device volume, maintaining compactness while enhancing power delivery capability.
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 simplifies the operation of the setting tool, ensures secure fastening in various substrates, and allows for easy recovery from piston faults, enhancing the tool's effectiveness and reliability.
Implementation Method 1
a prechamber (25) with which a first ignition device (26) is associated and in which, prior to the ignition of a fuel/air mixture in the main combustion chamber (6), a pressure acting on the main combustion chamber can be built up
Implementation Method 2
a driving piston (10) that is completely retracted in an initial position and can be driven by means of expandable gases out of the main combustion chamber (6) in the setting direction (15)
Data Source
AI summary
A combustion-powered placing tool for driving fastening elements into a subsurface comprises a main combustion chamber for a compressible fuel, a driving piston, which in a starting position is retracted, and which can be driven from the main combustion chamber in the placing direction via expandable gases, a prechamber to which an ignition device is assigned, and in which a pressure acting upon the main combustion chamber can be build up prior to ignition of a fuel-air mixture in the main combustion chamber, wherein an additional ignition device is assigned to the main combustion chamber. In order to improve the effectiveness and/or the functionality during driving-in of a fastener, the placing tool comprises a selector device, allowing a selection between a reduced energy operation having an ignition in the main combustion chamber and a high-energy operation having an ignition in the prechamber.