Electromagnetic Chamber Retainer for Fastener-Driving Tool Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Combustion-powered fastener-driving tools face issues such as premature unsealing of the combustion chamber, leading to operational failures and the inability to operate in a bump-fire mode, causing operator fatigue due to sequential firing mode limitations.
Innovation Solution
Incorporation of a chamber member retaining assembly controlled by an electromagnet to maintain the combustion chamber in a sealed position until the piston fully returns to its pre-firing position, enabling both sequential and bump-fire operational modes with a time-out feature to prevent continuous operation in bump-fire mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the chamber member is allowed to move freely to unseal the combustion chamber, then the tool can operate in bump-fire mode, but the combustion chamber may unseal prematurely before the piston returns to pre-firing position, causing operational failures
Solution Approach 1:
The chamber member retaining assembly dynamically adjusts the chamber member's position based on piston location. The electromagnet engages to hold the chamber member in the sealed position when the piston is in the firing or retraction stroke, and disengages when the piston returns to the pre-firing position, allowing automatic transition to unsealed position for bump-fire operation.
Solution Approach 2:
The system uses feedback from the piston's position (detected through the combustion chamber pressure changes or mechanical linkages) to control the electromagnet's engagement state. This ensures the chamber member is retained only when necessary to prevent premature unsealing, while allowing unsealing when the piston is ready for the next cycle.
2Reliability
If the chamber member is retained in the sealed position using an electromagnet, then premature unsealing is prevented, but the device complexity increases
Solution Approach 1:
The patent replaces complex mechanical linkages with an electromagnet-based retaining assembly. Instead of using additional mechanical springs, levers, or cam mechanisms to control chamber member retention, the system uses an electromagnet that can be controlled by a simple controller, reducing mechanical complexity while improving reliability.
Solution Approach 2:
The electromagnet's engagement state changes based on operational parameters (piston position, firing cycle stage). The controller adjusts the electromagnet's power consumption and engagement duration to match the required retention period, allowing flexible control without adding mechanical complexity.
3Reliability
If the tool operates only in sequential firing mode, then chamber sealing is reliable, but operator fatigue increases due to inability to use bump-fire mode
Solution Approach 1:
The system dynamically switches between operational modes based on the firing cycle. During the retraction stroke, the electromagnet disengages to allow the chamber member to move to the unsealed position, enabling bump-fire operation. This dynamic adjustment allows the tool to provide both sequential and bump-fire modes without compromising sealing reliability during the critical firing phase.
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
Ensures reliable tool operation by maintaining chamber sealing until the piston is fully retracted, allowing for both sequential and bump-fire modes, reducing operator fatigue and enhancing tool functionality.
Implementation Method 1
the chamber member retaining assembly includes an electromagnet configured to hold the chamber member in a retained position
Implementation Method 2
a spark plug to spark and ignite the fuel/air mixture in the combustion chamber. This generates high-pressure combustion gases that expand and force the piston to move through the cylinder
Implementation Method 3
This combined with heat exchange to the atmosphere and the fact that the combustion chamber remains sealed during firing generates a vacuum pressure above the piston and causes the piston to retract to the pre-firing position
Data Source
AI summary
A combustion-powered fastener-driving tool that include a chamber member retainer assembly configured to enable the controller of the tool to prevent the chamber member of the tool from moving to an open unsealed position and to ensure the tool's combustion chamber remains sealed until the piston fully returns to its pre-firing position.