Piston Seal Assembly for Compact Gas-Spring Fastener Drivers
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Solution Overview
Problem
Existing fastener drivers face power, size, and cost constraints, often requiring external air pressure sources and complex mechanisms.
Innovation Solution
A powered fastener driver design featuring a housing with a moveable piston and seal assembly within a cylinder, utilizing a gas spring principle with a storage chamber for compressed gas, eliminating the need for external air pressure and incorporating a driver blade and guide rings for efficient fastener driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If external air pressure sources are used in existing fastener drivers, then the device can achieve sufficient driving power, but the device complexity and size increase due to requiring external compressors and air supply systems
Solution Approach 1:
The invention extracts and eliminates the external air compressor and air supply system from the fastener driver, replacing them with an integrated spring-loaded piston mechanism that generates driving force internally through mechanical energy storage and release
Solution Approach 2:
The fastener driver becomes self-sufficient by incorporating an internal spring mechanism that stores and releases energy to drive the piston, eliminating the need for external power sources and making the device self-contained and portable
2Power
If external air pressure sources and complex mechanisms are used in existing fastener drivers, then sufficient driving power is achieved, but the device size and cost increase
Solution Approach 1:
The piston is nested within the cylindrical chamber, and the spring mechanism is integrated within the piston structure, creating a compact layered arrangement that minimizes the overall device volume while maintaining sufficient driving power
Solution Approach 2:
The device is segmented into functional modules including the cylindrical chamber, piston with circumferential grooves, seal assemblies, and spring mechanism, allowing for optimized space utilization and compact overall design
3Reliability
If seal assemblies are positioned radially outwardly of the biasing member, then seal integrity is maintained during piston movement, but the piston design complexity increases
Solution Approach 1:
The seal assembly is merged with the piston structure by positioning it within circumferential grooves on the piston outer surface, creating an integrated sealing solution that moves with the piston and maintains reliability without requiring separate complex sealing mechanisms
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 a compact, cost-effective fastener driver that operates efficiently without external air pressure, maintaining seal integrity and ensuring reliable fastener driving without leakage, addressing power and size constraints.
Implementation Method 1
The seal assembly includes a biasing member and a seal member positioned radially outwardly of the biasing member relative to the driving axis
Implementation Method 2
The seal member is configured to slidably engage the cylinder
Implementation Method 3
utilizing a gas spring principle with a storage chamber for compressed gas
Data Source
AI summary
A powered fastener driver includes a housing, a cylinder supported by the housing, and a moveable piston positioned within and moveable along a driving axis of the cylinder. The piston includes a circumferential groove on an outer peripheral surface thereof. A driver blade is attached to the piston and moveable therewith between a top-dead-center (TDC) position and a driven or bottom-dead-center (BDC) position. A seal assembly is received in the circumferential groove. The seal assembly is configured to create a seal between the piston and the cylinder. The seal assembly includes a biasing member and a seal member positioned radially outwardly of the biasing member relative to the driving axis.