Gas Spring Fastener Driver Mechanism
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Solution Overview
Problem
Existing fastener drivers face power, size, and cost constraints, often requiring external sources of air pressure or electrical energy to drive fasteners into a workpiece.
Innovation Solution
A gas spring fastener driver with a piston and extensible cylinder mechanism that uses stored pressurized gas to drive a drive blade from a retracted to a driven position, creating a vacuum to return the blade to its retracted position without external power sources, and an onboard lifter mechanism for rapid cycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If external power sources (compressed air, electrical energy) are used to drive fasteners, then driving power is sufficient, but device complexity and cost increase
Solution Approach 1:
The gas spring mechanism serves itself by using the return stroke of the drive blade to compress the gas spring, which then automatically provides the driving force for the next fastener. The system recovers energy from each cycle and stores it in the compressed gas, eliminating the need for external power sources while maintaining sufficient driving power.
Solution Approach 2:
The gas spring is pre-compressed during the return stroke before the fastening operation begins. This preliminary compression stores potential energy that is immediately converted to kinetic energy when the fastener needs to be driven, ensuring sufficient driving power is available without requiring external power during the actual fastening action.
2Power
If external power sources are used, then consistent driving force is achieved, but portability and ease of operation deteriorate
Solution Approach 1:
The device operates autonomously using the self-contained gas spring mechanism that converts the return motion of the drive blade into compressive force, then uses that stored energy to drive the fastener. This eliminates dependence on external air compressors or electrical outlets, greatly enhancing portability and ease of operation in field conditions.
Solution Approach 2:
The gas spring mechanism creates a self-balancing system where the potential energy stored during the return stroke is converted to kinetic energy during the fastening stroke. This energy equivalence allows the device to maintain consistent driving force throughout operation without requiring external power input, enabling portable use while maintaining performance.
3Productivity
If traditional fastener drivers are used, then fasteners can be driven, but cycle time between operations increases
Solution Approach 1:
The gas spring mechanism ensures continuous useful action by eliminating dead time between fastening operations. The return stroke that repositions the drive blade simultaneously compresses the gas spring, preparing the driving force for the next operation. This continuous energy storage and transfer process eliminates idle time and reduces the overall cycle time between fastening operations.
Solution Approach 2:
The device operates on a periodic cycle where the drive blade's reciprocating motion drives the gas spring compression and expansion in a rhythmic pattern. This periodic action optimizes the timing of energy storage and release, ensuring that each fastening operation is immediately followed by efficient preparation for the next, thereby minimizing cycle time and maximizing fastening speed.
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
Enables efficient and rapid placement of fasteners into a workpiece without external power, reducing cycle time between firing operations and eliminating the need for external air pressure or electrical energy.
Implementation Method 1
a gas spring mechanism for driving the drive blade from the retracted position to the driven position
Implementation Method 2
A vacuum is created in the cylinder housing for biasing the drive blade toward the retracted position
Data Source
AI summary
A fastener driver includes a main housing, a drive blade movable from a retracted position to a driven position for driving a fastener into a workpiece, and a gas spring mechanism for driving the drive blade from the retracted position to the driven position. The gas spring mechanism includes a piston movable between a retracted position and a driven position. The fastener driver also includes an extensible cylinder for moving the drive blade from the driven position toward the retracted position. The extensible cylinder includes a cylinder housing coupled one of the main housing or the drive blade, and a rod coupled to the other of the main housing or the drive blade. A vacuum is created in the cylinder housing for biasing the drive blade toward the retracted position.