Fastener Driver Stroke Ratio for Compact Ergonomic Operation
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Solution Overview
Problem
Existing fastener drivers are large in size, offer low operational comfort, and are inconvenient to use due to the need for manual handling and lack of ergonomic design.
Innovation Solution
A fastener driver with a compact design, incorporating a striking assembly, transmission mechanism, and energy storage device, optimized for a stroke ratio and impact force efficiency, featuring a grip placement that reduces user burden and enhances usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the fastener driver is designed with conventional size and structure, then it can provide sufficient impact force, but it becomes large in size and reduces operational comfort
Solution Approach 1:
The patent applies nesting by placing the energy storage device (spring) inside the housing structure, and positioning the striking assembly components within the housing. The firing pin is received by the housing, and the piston moves within the energy storage device's internal space. This nested arrangement maximizes component density while maintaining a compact overall device volume, directly resolving the contradiction between sufficient impact force generation and reduced device size.
Solution Approach 2:
The patent optimizes the spatial arrangement of components by utilizing three-dimensional space efficiently. The striking assembly moves along a longitudinal axis within the housing, with the piston moving between top dead center and bottom dead center positions. The energy storage device is positioned to accommodate this linear motion while maintaining a compact cross-sectional footprint, effectively using dimensional optimization to reduce overall device size without compromising operational comfort.
2Ease of operation
If the fastener driver is designed with conventional stroke ratio, then it can provide sufficient impact force, but it increases the device length and reduces ergonomics
Solution Approach 1:
The patent explicitly optimizes the stroke ratio parameter, defining it as the ratio of the piston stroke distance to the fastener length, and sets it within the range of 0.8 to 1.2. This parameter optimization allows the device to achieve sufficient impact force with a shorter overall length, directly addressing the contradiction between ergonomics and device length. The controlled stroke ratio ensures efficient energy transfer while maintaining compact dimensions.
Solution Approach 2:
The energy storage device (spring) is pre-compressed during the rearward movement of the striking assembly, storing potential energy before the forward striking action. This preliminary energy storage allows the device to generate sufficient impact force without requiring an excessively long stroke, thereby reducing overall device length while maintaining ergonomic properties.
3Ease of operation
If the fastener driver uses conventional manual handling design, then it can be operated, but it requires significant user effort and reduces convenience
Solution Approach 1:
The patent incorporates an automatic fastener feeding mechanism where the fastener is automatically positioned and presented to the firing pin without requiring manual intervention. The magazine or fastener supply mechanism feeds fasteners automatically, and the striking assembly automatically resets and repositions for the next strike. This self-service functionality reduces the user effort required for continuous operation, directly addressing the contradiction between convenience and manual handling effort.
Solution Approach 2:
The patent introduces a transmission mechanism or linkage system that mediates between the user's trigger activation and the striking assembly's motion. This intermediary mechanism amplifies or optimizes the user's input force, reducing the effort required to operate the device while maintaining effective impact force generation. The transmission mechanism acts as a mechanical mediator that improves operational convenience.
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 compact design and ergonomic features improve user comfort and convenience, allowing for efficient and ergonomic operation with reduced manual handling effort.
Implementation Method 1
an energy storage device configured to drive the striking assembly to move forward to a bottom dead center position to output an impact force
Implementation Method 2
output an impact force... the fastener driver is configured to drive a fastener within a preset length L4 to move
Data Source
AI summary
A fastener driver includes a firing pin, a piston connected to the firing pin, a driving member driving a striking assembly to move backward to a top dead center position, and an energy storage device driving the striking assembly to move forward to a bottom dead center position to output an impact force. The distance L3 between the top dead center position and the bottom dead center position is defined as the stroke of the striking assembly, the fastener driver is configured to drive a fastener within a preset length LA to move, and the ratio of the stroke of the striking assembly to the preset length is less than or equal to 1.5 to 1.