Powered Fastener Driver Layout for Compact Size and Striker Force
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Solution Overview
Problem
Existing powered fastener drivers face challenges in reducing their size and weight while maintaining effective fastener driving performance, particularly in terms of stroke length and striker force.
Innovation Solution
A powered fastener driver design featuring a non-concentric configuration of the storage chamber cylinder and driver cylinder, a smaller diameter piston, and a reduced stroke length, combined with a gas spring mechanism, to achieve compact size and balanced handling without compromising driving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a conventional powered fastener driver design is used, then sufficient striker force and fastener driving performance are achieved, but the device size and weight are excessive
Solution Approach 1:
The driver cylinder is positioned inside the storage chamber cylinder, creating a nested configuration where the driver cylinder bore is concentric with the storage chamber cylinder. This nesting allows the gas spring mechanism to be compact while maintaining sufficient stroke length and striker force, reducing overall device weight without compromising performance
Solution Approach 2:
The patent optimizes the piston diameter to less than 45 mm and the stroke length to between 60-90 mm, representing parameter changes from conventional designs. These dimensional adjustments reduce the size and weight of moving components while the non-concentric gas spring configuration compensates to maintain adequate striker force
2Length of moving object
If the piston diameter is reduced to decrease device size, then compact dimensions are achieved, but the stroke length must be increased to maintain driving performance
Solution Approach 1:
The driver cylinder is nested within the storage chamber cylinder, allowing the stroke length to extend along the axis of the nested configuration. This enables a stroke length of 60-90 mm to be achieved within a compact overall package, compensating for the reduced piston diameter of less than 45 mm and maintaining sufficient driving performance
3Length of moving object
If the stroke length is reduced to decrease device size, then compact dimensions are achieved, but the striker force is compromised
Solution Approach 1:
The patent specifies a stroke length between 60-90 mm and piston diameter less than 45 mm, representing optimized parameter changes from conventional designs. The non-concentric gas spring configuration and nested cylinder arrangement compensate for the reduced dimensions, maintaining adequate striker force through optimized gas pressure and mechanical leverage
Solution Approach 2:
The non-concentric configuration of the gas spring mechanism, where the driver cylinder bore is concentric with the storage chamber cylinder but the overall gas spring arrangement is non-concentric, creates asymmetric force distribution that enhances striker force output despite reduced stroke length and piston diameter
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 design allows for a reduced overall size and improved balance while maintaining sufficient striker force and fastener driving performance, with a favorable compression ratio and reduced lifting shear stress on the lifter mechanism.
Implementation Method 1
a gas spring mechanism, to achieve compact size and balanced handling without compromising driving efficiency
Implementation Method 2
an outer storage chamber cylinder positioned within the housing and including pressurized gas in fluid communication with the inner cylinder
Data Source
AI summary
A powered fastener driver including a piston movable within the inner cylinder from a top-dead-center (TDC) position to a driven or bottom-dead-center (BDC) position. The piston has a diameter of less than 45 mm, and a stroke length of the piston between the TDC position and the BDC position measuring greater than 60 mm and less than 90 mm.