Rigid Fuel Dosing Lever Support for Combustion Fastener Tool
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current combustion powered fastener driving tools experience inconsistent fuel dispensing due to the flexible nature of their fuel delivery systems, which are affected by heat, age, and dimensional tolerances, leading to variable support for the fuel actuation member and subsequent inconsistent fuel doses.
Innovation Solution
A combustion powered fastener driving tool with a more rigid support system for the fuel dosing lever, utilizing pivot pins and pivot pin receiving members in the cylinder head and housing cap to maintain consistent dosing, independent of the fuel cell door's flexibility, ensuring repeatable and stable axial forces are transferred to the fuel metering valve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible door member is used to support the fuel actuation member, then the fuel delivery system can accommodate dimensional tolerances and aging, but the support becomes variable causing inconsistent fuel dosing
Solution Approach 1:
The support structure is segmented into multiple components: a rigid support member fixed to the housing, and a resilient member that provides controlled flexibility. This segmentation allows the rigid portion to maintain precise positioning for consistent fuel dosing, while the resilient portion absorbs dimensional variations and aging effects.
Solution Approach 2:
The support structure combines rigid and resilient materials to create a composite system. The rigid portion (e.g., metal support member) provides stable, precise positioning, while the resilient portion (e.g., elastomeric or spring element) provides compliance to accommodate dimensional tolerances and thermal expansion without compromising dosing consistency.
2Reliability
If a rigid support system is used for the fuel dosing lever, then consistent fuel dispensing is achieved, but the system becomes less adaptable to dimensional variations
Solution Approach 1:
A resilient member acts as an intermediary element between the rigid support structure and the fuel dosing lever. This intermediary provides a buffer that absorbs dimensional variations and thermal expansion, allowing the rigid support to maintain precise positioning while the system remains adaptable to manufacturing tolerances and environmental changes.
Solution Approach 2:
The resilient support member provides pre-configured compliance that anticipates and cushions against dimensional variations, thermal expansion, and assembly tolerances. This beforehand cushioning ensures that the rigid support structure maintains consistent positioning despite these variations, achieving both reliability and adaptability.
3Ease of manufacture
If the fuel cell door is made flexible to ease assembly, then assembly is simplified, but heat and age cause behavior changes leading to variable support
Solution Approach 1:
The resilient member is specifically selected and engineered to maintain its mechanical properties across the expected temperature range and service life. By choosing materials with appropriate thermal stability and aging resistance, the support structure maintains consistent behavior under heat and age while still providing the flexibility needed for easy assembly.
Solution Approach 2:
The resilient support member provides pre-configured compliance that anticipates and cushions against thermal expansion and dimensional changes due to aging. This beforehand cushioning compensates for these effects before they can cause inconsistent fuel dosing, maintaining both ease of assembly and behavioral stability.
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 rigid support system ensures consistent and repeatable fuel dispensing, maintaining the desired dose of fuel for each combustion cycle, enhancing the tool's efficiency and reliability.
Implementation Method 1
The combustion ring fingers are pivotally connected to the cylinder head at a pivot point located at an upper portion of the combustion chamber
Implementation Method 2
Actuation of the fuel dosing lever causes the fuel dosing lever to transfer axial forces to a fuel cell receiving block to dispense a dose of fuel
Implementation Method 3
activation of the trigger causes the spark generator to deliver a spark and ignite the fuel in the combustion chamber. The resulting combustion energy forces the piston downward
Implementation Method 4
The piston contacts a fastener positioned in the nosepiece assembly and drives the fastener into the workpiece
Data Source
AI summary
Various embodiments of the present disclosure provide a combustion powered fastener driving tool including a fuel cell receiver configured to receive and engage a fuel cell metering valve of a fuel cell, the fuel cell metering valve configured to dispense a dose of fuel from the fuel cell.