Powered Fastener Driver With Partial-Rotation Crank Compression
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Solution Overview
Problem
Existing fastener drivers face power, size, and cost constraints due to reliance on external air pressure sources, which can limit their effectiveness and usability.
Innovation Solution
A powered fastener driver with an on-board air compressor and a novel drive mechanism using a crank arm that rotates less than 360 degrees to complete fastener driving cycles, combined with a back-pressure adjustment mechanism and sensorless control system to optimize performance and versatility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If external air pressure sources are used in powered fastener drivers, then sufficient power for driving fasteners is achieved, but the device complexity and size increase due to external equipment requirements
Solution Approach 1:
The patent combines the air compressor and fastener driver functions into a single integrated tool. The compressor chamber and driver chamber are housed together with shared components (motor, crank arm, valves), eliminating the need for external air compressors and reducing overall system complexity while maintaining sufficient power for fastener driving.
Solution Approach 2:
The tool performs multiple functions within a single device: the motor drives the crank arm which simultaneously compresses air in the compressor chamber and actuates the driver chamber. The crank arm mechanism serves dual purposes of power transmission for both compression and driving cycles, creating a multi-functional system that reduces equipment requirements.
2Productivity
If traditional 360-degree crank arm rotation is used, then complete fastener driving cycles are achieved, but the weight and size of the tool increase
Solution Approach 1:
The crank arm is designed to rotate through less than 360 degrees (approximately 200 degrees) by utilizing dynamic valve timing and pressure differentials. The intake and exhaust valves open and close at specific points during the crank arm's limited rotation, allowing complete compression and driving cycles to be achieved without full rotational movement, thereby reducing the size and weight of rotating components.
Solution Approach 2:
The patent changes the operational parameters of the crank arm rotation from the traditional 360-degree sweep to a reduced angular range. By adjusting the valve timing and pressure parameters, the system achieves effective compression and driving cycles with less rotational movement, reducing the dimensions and mass of the crank mechanism.
3Ease of operation
If fixed back-pressure is used in the driver chamber, then simple control is maintained, but adaptability to different fastening tasks is reduced
Solution Approach 1:
The back-pressure regulation mechanism allows dynamic adjustment of the exhaust pressure in the driver chamber. By varying the back-pressure, the operator can adapt the tool's performance to different fastener types and material hardness levels. This dynamic control maintains operational simplicity while significantly improving versatility across different fastening applications.
Solution Approach 2:
The system enables parameter adjustment of the driver chamber pressure by modifying the back-pressure setting. This parameter change allows the same tool to adapt to various fastening tasks requiring different driving forces, transforming a fixed-performance device into an adaptable system while maintaining ease of operation through a simple adjustment mechanism.
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 solution reduces tool size and weight, enhances handling, and allows for versatile fastening applications by adjusting air pressure, while eliminating the need for external air sources and reducing user fatigue.
Implementation Method 1
a crank arm assembly allowing less than 360-degree rotation to complete fastener driving cycles
Implementation Method 2
an on-board air compressor... optimize air usage
Data Source
AI summary
A powered fastener driver includes a first cylinder, a first piston positioned within the first cylinder, a second cylinder in fluid communication with the first cylinder, and a second piston positioned within the second cylinder. The second piston is moveable between a top-dead-center position and a bottom-dead-center position to initiate a fastener driving cycle. A drive blade is coupled to the second piston for movement therewith and a drive mechanism is configured to drive the first piston between the top-dead-center position and at or near the bottom-dead-center position. The drive mechanism includes a crank arm configured to rotate less than 360 degrees in a first direction to complete a first fastener driving cycle and less than 360 degrees in an opposite, second direction to complete a subsequent second fastener driving cycle.