Gas Spring Fastener Driver with Parallel Return Mechanisms
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Solution Overview
Problem
Existing fastener drivers face power, size, and cost constraints, often requiring external sources of air pressure or energy to drive fasteners into a workpiece.
Innovation Solution
A gas spring fastener driver with a movable drive blade and separate return mechanisms for the drive blade and gas spring, utilizing a pressurized gas stored in a cylinder to drive the blade from a retracted to a driven position, and an extensible cylinder and lifter mechanism to return both to their retracted positions, eliminating the need for external power sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If external power sources (compressed air, electrical energy, flywheel mechanisms) are used to drive fasteners, then sufficient driving power is achieved, but device size and cost increase
Solution Approach 1:
The gas spring mechanism is integrated within the handle assembly of the fastener driver, with the cylinder and piston nested inside the handle housing. This nesting approach allows the power generation component to be compact and self-contained, eliminating the need for external power sources while maintaining sufficient driving power for fastener insertion.
Solution Approach 2:
The gas spring mechanism serves as a self-powered system that generates its own driving force through the compression and expansion of gas within the spring. The user's manual compression action stores energy in the gas spring, which then automatically releases to drive the fastener, eliminating dependence on external power sources like compressed air tanks or batteries.
2Use of energy by moving object
If external power sources are used to drive fasteners, then adequate energy is supplied, but device cost increases
Solution Approach 1:
The gas spring mechanism is a self-contained energy system that requires no external power supply infrastructure. The energy is stored mechanically within the gas spring during the user's compression action and released automatically during fastener driving, eliminating the need for expensive external power sources such as compressed air compressors or battery packs.
Solution Approach 2:
The invention utilizes a gas spring mechanism that employs compressed gas as the energy storage medium. This pneumatic approach provides a cost-effective alternative to electrical or mechanical flywheel systems, as gas springs are relatively simple, inexpensive components that can store sufficient energy for fastener driving without requiring complex external power infrastructure.
3Device complexity
If the gas spring mechanism is returned to retracted state with the drive blade, then mechanism simplicity is maintained, but power consumption increases and cycle time increases
Solution Approach 1:
The return mechanism is divided into two independent segments: one for returning the drive blade and another for returning the gas spring mechanism. This segmentation allows each component to be returned through optimized paths, reducing the overall cycle time while maintaining reasonable mechanical complexity through modular design.
Solution Approach 2:
The system employs dynamic return mechanisms that can operate independently and simultaneously. The drive blade return and gas spring return are decoupled, allowing each to be optimized for its specific motion requirements. This dynamic approach reduces the total time required for the complete return cycle compared to a coupled, sequential return system.
4Productivity
If separate return mechanisms are used for drive blade and gas spring, then cycle time is reduced and productivity increases, but device complexity increases
Solution Approach 1:
The return function is segmented into two independent mechanisms: a first return mechanism for the drive blade and a second return mechanism for the gas spring. This segmentation enables parallel operation, reducing cycle time, while the modular nature of the segmented design allows for efficient manufacturing and assembly, partially offsetting the complexity increase.
Solution Approach 2:
The separate return mechanisms are designed to perform multiple functions within the overall system. The first return mechanism not only returns the drive blade but also contributes to resetting the fastener feeding mechanism. The second return mechanism returns the gas spring and simultaneously prepares the power system for the next cycle. This multi-functionality reduces the need for additional dedicated components, thereby limiting the increase in overall device complexity.
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
This design allows for rapid and efficient driving of fasteners into a workpiece by reducing cycle time and minimizing power consumption, as the gas spring mechanism is self-powered and the return mechanisms operate in parallel, enhancing the speed and efficiency of fastener placement.
Implementation Method 1
a gas spring mechanism for driving the drive blade from the retracted position to the driven position. The gas spring mechanism is moveable between a retracted state and a driven state
Implementation Method 2
utilizing a pressurized gas stored in a cylinder to drive the blade from a retracted to a driven position
Data Source
AI summary
A fastener driver includes a drive blade movable from a retracted position to a driven position for driving a fastener into a work piece. The fastener driver further includes a gas spring mechanism for driving the drive blade from the retracted position to the driven position. The gas spring mechanism is moveable between a retracted state and a driven state. The fastener driver further includes a first return mechanism for moving the drive blade from the driven position toward the retracted position, and a second return mechanism for returning the gas spring mechanism toward the retracted state separately from movement of the drive blade.