Pyrotechnic Driving Device With Slide-Controlled Venting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing driving devices struggle to easily adjust driving energy over a wide range with a given propellant charge, and combustion residues can cause chamber contamination.
Innovation Solution
A driving device with a venting channel system and an actuator that allows adjustable energy transmission by varying the exposure of vent openings and using threaded engagements to reduce jamming risks, featuring a movable slide and threaded components with defined gap spacings to manage combustion forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a propellant charge is used to drive a piston element, then driving energy is generated, but combustion residues contaminate the combustion chamber
Solution Approach 1:
The patent extracts harmful combustion residues from the combustion chamber by introducing a venting channel that opens into the chamber. This channel allows residues to be removed during the driving process, separating the harmful byproducts from the useful driving function and preventing contamination buildup.
Solution Approach 2:
The patent converts the harmful combustion residues into a beneficial flushing mechanism. By designing the venting channel to expose a cross-section during piston movement, the combustion gases and residues are directed through the channel, effectively cleaning the chamber while maintaining driving pressure.
2Adaptability or versatility
If driving energy is adjusted using a slide mechanism, then energy transmission can be varied, but the device complexity increases
Solution Approach 1:
The slide mechanism serves multiple functions simultaneously: it adjusts the exposure of the venting channel to control driving energy, guides the piston element during movement, and maintains sealing between combustion chambers. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
The patent employs a dynamic slide mechanism that can move between different positions to adjust energy transmission. The slide's ability to change position dynamically allows for variable driving energy output while maintaining a relatively simple mechanical structure through continuous motion rather than complex discrete adjustments.
3Ease of operation
If threaded components are used in the combustion chamber, then adjustability is improved, but jamming from combustion residues increases
Solution Approach 1:
The patent introduces an intermediary bearing between the threaded actuator components and the combustion chamber wall. This bearing acts as a mediator that supports the actuator while preventing direct contact between threaded components and combustion residues, thereby maintaining adjustability while reducing jamming risks.
Solution Approach 2:
The bearing extracts the threaded actuator components from direct exposure to the harsh combustion environment. By mounting the actuator in the bearing rather than directly in the combustion chamber, the threaded components are protected from residue accumulation that would cause jamming, while still allowing for adjustment functionality.
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
Enables easy and intuitive adjustment of driving energy with reduced contamination and jamming, ensuring reliable operation even under adverse conditions.
Implementation Method 1
the combustion gases resulting after the ignition of a pyrotechnic charge expand in a combustion chamber
Implementation Method 2
the combustion gases resulting after the ignition of a pyrotechnic charge expand in a combustion chamber. This has the effect that a piston is accelerated as an energy transmission means and drives a fastening element into a workpiece
Data Source
AI summary
A driving device, comprising a hand-held housing with a piston element arranged therein for the transmission of energy to a fastening element to be driven in a driving direction, a propellant charge, and a combustion chamber, which is arranged between the propellant charge and the piston element and extends around a central axis, and an actuator, by which the energy to be transmitted from the propellant charge to the piston element can be varied in such a way that the energy can be set, wherein a venting channel connected to the combustion chamber can be exposed by means of a movable slide of the actuator, wherein the venting channel opens out into the combustion chamber by a vent opening, which can be partially or completely covered by the slide, and wherein a cross-sectional area of the vent opening increases in the driving direction.