Pneumatic Fastener Driver Valve Mechanism Reducing Reactionary Force
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Solution Overview
Problem
Existing fastener driving apparatuses are bulkier, costly, and generate high reactionary force, limiting their portability and efficiency, with retracting mechanisms consuming drive energy and potentially causing safety hazards.
Innovation Solution
A fastener driving apparatus with a power source, control circuit, motor, and valve arrangement that uses a pneumatically connected piston and anvil system, where the valve arrangement switches between open and closed positions to control gas flow, minimizing reactionary force and using vacuum for energy-efficient retraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If electrical energy is used to drive fasteners, then fasteners can be driven into workpiece, but reactionary force becomes high and user effort increases
Solution Approach 1:
The patent employs a pneumatic system where a motor-driven piston compresses gas in a first hollow guide member, and the compressed gas acts on a second piston to drive the anvil and fastener into the workpiece. This pneumatic mechanism reduces reactionary force compared to direct electrical motor drive, making the tool easier to handle during prolonged use.
2Productivity
If flywheel mechanism is used to drive fasteners quickly, then drive speed increases, but device size and weight increase
Solution Approach 1:
The patent uses a pneumatic system with compressed gas to drive the anvil rapidly into the workpiece. The motor-driven piston compresses gas which then expands to propel the second piston and anvil forward. This pneumatic approach achieves high driving speed without requiring a heavy flywheel mechanism, keeping the apparatus lightweight and portable.
3Power
If striker mechanism with spring retracting is used, then fastener can be driven into workpiece, but drive energy is consumed by retracting mechanism
Solution Approach 1:
The patent employs a pneumatic system where compressed gas drives the anvil into the workpiece. The motor-driven piston compresses gas in a chamber, and this compressed gas then acts on a second piston to propel the anvil forward. The system eliminates the need for separate spring-based retracting mechanisms, as the pneumatic system itself controls both the driving and retracting phases, reducing overall energy consumption.
4Power
If compressed air system is used to drive fasteners, then fasteners can be driven into workpiece, but portability decreases
Solution Approach 1:
The patent uses an integrated pneumatic system where a motor (electrically coupled to a power source) drives a piston to compress gas within the apparatus itself. This self-contained pneumatic system eliminates the need for external air compressors and hoses, making the fastener driving apparatus portable and easy to operate while maintaining effective fastener driving 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
The apparatus is portable, efficient, and minimizes reactionary force, allowing for full fastener insertion in a single stroke with reduced energy consumption and enhanced user safety.
Implementation Method 1
the first piston is configured to move towards a top dead center of the first hollow guide member thereby compressing the gas in the gas chamber to a predetermined pressure
Implementation Method 2
the vacuum created in the first hollow guide member to communicate to the second hollow guide member, thereby causing the second piston and the anvil to retract to initial positions
Data Source
AI summary
A fastener driving apparatus includes a power source, a control circuit, a motor, a first hollow guide member having a first volumetric capacity, a first piston, a linear motion converter, a second hollow guide member having a second volumetric capacity, a second piston, an anvil, a valve arrangement and at least one sensor. The guide members may have an elliptical or oval cross-section. During a compression stroke, the first piston compresses gas in the first hollow guide member. The valve arrangement opens and communicates the compressed gas to the second hollow guide member, causing the second piston to move the anvil to drive a fastener. During a return stroke of the first piston, the valve arrangement opens, communicating a vacuum created in the first hollow guide member to the second hollow guide member, thereby causing the second piston and the anvil to retract to their initial positions.