Two Shot Power Nailer Solenoid Spring Energy Storage
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Solution Overview
Problem
Power nailers face limitations in providing a significant drive force due to size, weight, and cost constraints, making it challenging to achieve high force with a small and inexpensive motor.
Innovation Solution
A mechanical force storage element, such as a spring, is compressed during the initial plunger movement and then released in combination with the drive motor force, allowing for a greater total force to be applied with a smaller package by utilizing a solenoid coil, capacitor, or mechanical brake to optimize energy storage and release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a more powerful motor is used to provide greater drive force, then the drive force increases, but the size, weight, and cost increase
Solution Approach 1:
The spring is pre-compressed during the return stroke to store mechanical energy before the driving stroke. This preliminary action allows the spring to release stored energy during the nail-driving operation, providing additional force without requiring a larger motor.
Solution Approach 2:
The system uses periodic alternating current to the solenoid coil, creating alternating driving and return strokes. During the return stroke, the spring is compressed and energy is stored; during the driving stroke, this stored energy is released to augment the motor's output force.
2Force
If a more powerful motor is used to provide greater drive force, then the drive force increases, but the device size increases
Solution Approach 1:
The spring is pre-compressed during the return stroke to store mechanical energy before the driving stroke. This preliminary action allows the spring to release stored energy during the nail-driving operation, providing additional force without requiring a larger motor.
Solution Approach 2:
The system uses periodic alternating current to the solenoid coil, creating alternating driving and return strokes. During the return stroke, the spring is compressed and energy is stored; during the driving stroke, this stored energy is released to augment the motor's output force.
3Force
If a more powerful motor is used to provide greater drive force, then the drive force increases, but the cost increases
Solution Approach 1:
The spring is pre-compressed during the return stroke to store mechanical energy before the driving stroke. This preliminary action allows the spring to release stored energy during the nail-driving operation, providing additional force without requiring a larger motor.
Solution Approach 2:
The system uses periodic alternating current to the solenoid coil, creating alternating driving and return strokes. During the return stroke, the spring is compressed and energy is stored; during the driving stroke, this stored energy is released to augment the motor's output force.
4Use of energy by moving object
If the spring is compressed during the return stroke, then energy is stored for the driving stroke, but the plunger must be held against the brake
Solution Approach 1:
The brake mechanism is designed to be automatically engaged by the plunger's own momentum during the return stroke. The plunger's kinetic energy serves to activate the brake, eliminating the need for an additional actuating mechanism and reducing overall system 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 approach enables a power nailer to deliver a higher drive force with a compact and cost-effective design by storing energy in the first plunger direction and combining it with the motor-driven force in the second direction, effectively doubling the power stroke.
Implementation Method 1
a spring, storing the force. Once the spring is compressed, a separate drive motor force drives the plunger in an opposed direction, combining the release of the spring with the drive motor force
Implementation Method 2
The control is programmed, and the spring is designed, such that a firing force is provided to drive the plunger in an opposed direction once the spring is compressed to a desired extent
Implementation Method 3
the control includes a capacitor that stores a firing force as the plunger is being pulled rearwardly. When the plunger reaches its rearwardmost position, the capacitor is discharged to fire the plunger in the firing direction
Implementation Method 4
a simple, mechanical brake catches and holds the plunger as it is pulled through its first return stroke
Data Source
AI summary
A nail gun includes a power coil for moving a plunger in two opposed directions. The plunger is first moved away from a nail, and force from this movement is stored in a force storage mechanism. The plunger is then driven by the coil in an opposed direction, and the force stored within the forced storage mechanism is released, such that the released force and the power force from the coil are combined to drive a nail into a work piece.