Powered Fastener Driver Composite Piston and Nesting
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Solution Overview
Problem
Existing powered fastener drivers face challenges in efficiently driving fasteners into workpieces due to limitations in magazine design, pusher mechanism efficiency, and the integration of advanced materials for improved performance.
Innovation Solution
The powered fastener driver incorporates a housing with a nosepiece, a driver blade movable between ready and driven positions, a piston coupled to the driver blade, and a storage chamber cylinder containing pressurized gas. The piston is manufactured using a method that combines two distinct materials for enhanced performance, and the nosepiece includes a continuous piece of material for structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-material piston is used in the driver cylinder, then the manufacturing process is simple, but the performance and reliability are insufficient
Solution Approach 1:
The piston is constructed using composite materials with a hardened steel core providing structural integrity and a ductile iron outer layer providing wear resistance and shock absorption. This multi-material construction resolves the contradiction by achieving superior reliability through material properties while managing the increased manufacturing complexity through a standardized composite casting process.
Solution Approach 2:
Different regions of the piston are made from different materials optimized for their specific functions: the core uses hardened steel for strength and dimensional stability, while the outer layer uses ductile iron for wear resistance and shock absorption. This local differentiation of material properties resolves the contradiction by tailoring material characteristics to specific functional requirements within the piston.
2Loss of time
If the driver blade is pre-loaded into the nosepiece, then the ready position is achieved faster, but the lifting mechanism must overcome greater spring force
Solution Approach 1:
The system uses a adjustable spring preload mechanism that allows the operator to modify the spring force parameter based on the specific application requirements. By changing the spring preload parameter, the system can optimize between faster blade deployment (higher preload) and reduced lifting power requirements (lower preload), resolving the contradiction through parameter adjustment.
Solution Approach 2:
The lifting mechanism is designed with a variable force capability that can dynamically adjust the lifting force based on operational conditions. The adjustable spring preload creates a dynamic system where the force requirements can be optimized for different scenarios, resolving the contradiction between speed and power requirements.
3Duration of action of stationary object
If the storage chamber cylinder has a large volume, then the pressurized gas duration is extended, but the device size increases
Solution Approach 1:
The storage chamber cylinder is nested within the housing structure, utilizing the existing internal space of the power tool housing. This nesting approach allows the storage chamber to have sufficient volume for extended pressurized gas duration while maintaining a compact overall device size, as the storage chamber occupies otherwise unused space within the housing boundaries.
Solution Approach 2:
The storage chamber cylinder is positioned longitudinally along the axis of the housing, utilizing the length dimension rather than expanding the radial dimensions. This dimensional arrangement allows for increased gas storage volume without significantly increasing the overall device size, resolving the contradiction between duration and compactness.
4Strength
If the nosepiece is made from one continuous piece of material, then the structural integrity is improved, but the manufacturing complexity increases
Solution Approach 1:
The nosepiece is manufactured using additive manufacturing (3D printing) technology, which allows complex monolithic structures to be created directly from digital models without requiring assembly of multiple parts. This manufacturing parameter change resolves the contradiction by achieving high structural integrity through a single-piece construction while simplifying the manufacturing process through additive fabrication rather than traditional subtractive or assembly methods.
Data Source
AI summary
A powered fastener driver comprising a housing, a nosepiece extending from the housing, a workpiece contact bracket at least partially surrounding the nosepiece, wherein the workpiece contact bracket slides on the nosepiece, a driver blade movable within the nosepiece between a ready position and a driven position, and a drive mechanism operatively coupled with the driver blade to drive the driver blade. The nosepiece includes a tail extending outwardly at least partially along a length of the nosepiece and the workpiece contact bracket includes an internal bore having a tail socket extending at least partially along a length of the workpiece contact bracket, wherein the tail of the nosepiece fits into the tail socket of the workpiece contact bracket to form a slip fit elongated dovetail joint between the nosepiece and the workpiece contact bracket.