Fastener Driving Tool Nose Part Actuation Mechanism
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Solution Overview
Problem
Existing fastener driving tools with flywheel mechanisms lack a secure and balanced actuation mechanism that ensures safe and efficient operation, particularly in transitioning between operative and inoperative positions.
Innovation Solution
A fastener driving tool with a pair of sub-assemblies featuring brushless motors and flywheels, where the nose part's retraction mechanically forces the sub-assemblies towards each other, enabling a secure and balanced actuation mechanism, and a connection mechanism that interconnects the nose part with the sub-assemblies to control their movement, ensuring safe operation by breaking and re-forming the operative interconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical actuation mechanism is used to force sub-assemblies towards each other, then the safety and operational control is improved, but the device complexity increases
Solution Approach 1:
The nose part serves dual functions: it is both the fastener driving component and the actuation mechanism that forces sub-assemblies towards each other. When the nose part is retracted, it mechanically forces the sub-assemblies towards each other through its connection mechanism, eliminating the need for separate actuation components and reducing overall device complexity while maintaining safety and operational control
Solution Approach 2:
The connection mechanism interconnects the nose part with the sub-assemblies, allowing the nose part to perform multiple functions: driving fasteners and simultaneously controlling the positioning of sub-assemblies. This multi-functionality improves reliability by ensuring proper sub-assembly positioning while maintaining a relatively simple overall structure
2Measurement precision
If the nose part retraction mechanically forces sub-assemblies towards each other, then the actuation precision is improved, but the ease of operation deteriorates
Solution Approach 1:
The system is self-actuating through the nose part's own retraction motion. When the nose part is retracted during normal operation, it automatically forces the sub-assemblies towards each other through the connection mechanism without requiring separate control inputs from the operator. This maintains ease of operation while achieving precise actuation through the mechanical geometry of the connection 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 provides a secure and balanced actuation mechanism that ensures safe and efficient operation by mechanically forcing the sub-assemblies towards each other, allowing for precise control of the flywheel movement, enhancing safety by preventing direct firing onto already driven fasteners and improving the tool's overall performance.
Implementation Method 1
each sub-assembly further comprises a brushless motor having a central stator and an external rotor arranged to rotate around the stator
Implementation Method 2
a pair of sub-assemblies movably mounted on the support, each sub-assembly comprising a flywheel; and a nose part retractable relative to the support; the tool arranged such that, in use, when the nose part is retracted, its movement relative to the support mechanically forces the sub-assemblies towards each other
Implementation Method 3
two flywheels arranged to propel an impact ram, to drive nails from the tool
Data Source
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AI summary
A fastener driving tool (1) arranged to drive fasteners into a workpiece comprises a support (3), a pair of sub-assemblies (2) movably mounted on the support (3), each subassembly comprising a motor (13) and an associated flywheel (17), and a nose part (14) retractable relative to the support (3). The tool is arranged such that, in use, when the nose part (14) is retracted, its movement relative to the support (3) mechanically forces the sub-assemblies (2) towards each other. The forcing of the sub-assemblies towards each other by the retraction of the nose part (14) may move the sub-assemblies (2) from an inoperative position to an operative position.