Gas Spring Fastener Driver With Inductive Position Sensing
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Solution Overview
Problem
Existing fastener drivers often require external air pressure sources and lack effective sensors for precise control and fault detection, leading to inefficiencies and potential operational failures.
Innovation Solution
A gas spring-powered fastener driver with an integrated pressurized gas cylinder, a rotary lifter mechanism, and inductive sensors for angular and linear position detection, enabling precise control and fault detection without external air pressure, and enhancing operational reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If external air pressure sources are used to power the fastener driver, then the driving force can be sufficient, but the device complexity increases and operational reliability decreases due to external dependencies
Solution Approach 1:
The fastener driver incorporates an integrated gas spring mechanism that stores and releases energy autonomously within the device. The gas spring is sealed within the housing, allowing the device to generate its own driving force without requiring external air pressure sources or other external energy inputs, thereby achieving self-service operation.
2Force
If external air pressure sources are used to power the fastener driver, then the driving force can be sufficient, but the device complexity increases
Solution Approach 1:
The gas spring mechanism is merged with the existing fastener driver structure, integrating the energy storage and release functions directly into the driver housing. This consolidation eliminates the need for separate external air pressure sources and associated control systems, thereby reducing overall device complexity while maintaining sufficient driving force.
3Device complexity
If no sensors are installed for position detection, then the device complexity is reduced, but measurement precision and control accuracy deteriorate
Solution Approach 1:
The patent replaces complex mechanical position detection mechanisms with inductive sensors that detect the positions of the piston and driver blade through non-contact electromagnetic fields. This substitution provides precise position measurement while avoiding the mechanical complexity of linkages, levers, or physical contact-based sensors, achieving high measurement precision with minimal added complexity.
4Device complexity
If no sensors are installed for fault detection, then the device complexity is reduced, but reliability and operational safety deteriorate
Solution Approach 1:
The inductive sensors provide real-time feedback on the operational status of the piston and driver blade positions to the control system. This feedback enables the control system to detect anomalies, verify proper operation, and identify potential faults early, thereby enhancing reliability and operational safety without requiring complex additional sensor networks or monitoring systems.
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 provides efficient fastener driving with precise control and fault detection, ensuring reliable operation and reducing the need for external air pressure sources.
Implementation Method 1
The cylinder containing a pressurized gas. The piston within the cylinder and moveable from a top-dead-center position to a bottom-dead-center position
Implementation Method 2
an inductive sensor configured to detect the sensor target to determine a position of the workpiece contact element in one of the extended position or the retracted position
Implementation Method 3
a drive unit configured to provide torque to the rotary lifter, causing it to rotate
Data Source
AI summary
A powered fastener driver including: a rotary lifter rotatably supported within the housing and configured to sequentially engage the plurality of teeth to move a driver blade from a bottom-dead-center position toward a top-dead-center position; a drive unit configured to provide torque to the rotary lifter, causing it to rotate; a nosepiece defining a fastener driving channel, the fastener driving channel extending along a driving axis of the driver blade; a workpiece contact element movable relative to the nosepiece between an extended position and a retracted position; a sensor assembly including a first inductive sensor configured to detect a position of the workpiece contact element in one of the extended position or the retracted position; and a second inductive sensor configured to detect an angular position of the rotary lifter, wherein the first inductive sensor and the second inductive sensor are on opposite sides of the rotary lifter.