Nail Gun Spring Assembly for Higher Force Without Shorter Lifespan
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Solution Overview
Problem
Existing nail guns face challenges in providing sufficient spring force for nail firing, as increasing the wire diameter or pitch of a single spring reduces the lifespan and increases maintenance costs, while traditional methods fail to meet the requirements for larger spring forces.
Innovation Solution
A driving mechanism with a spring assembly comprising multiple springs sheathed together, where the helical directions of adjacent springs are opposite, and a guide rod supports and limits the springs, allowing for increased spring force without reducing lifespan or increasing maintenance costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the wire diameter of a single spring is increased to provide greater spring force, then the spring force increases, but the speed of the spring decreases, resulting in poor nail firing effect
Solution Approach 1:
The patent divides a single spring into multiple springs (typically 2-4 springs) arranged in parallel within the same space. Each spring has a smaller wire diameter than a single spring would need to provide the same total force, allowing them to respond faster while collectively delivering the required spring force for effective nail firing.
2Force
If the pitch of a single spring is increased or middle diameter is reduced to increase spring force, then the spring force increases within a small range, but the lifespan of the spring is seriously reduced
Solution Approach 1:
The patent uses multiple springs with normal pitch and diameter specifications instead of over-stressing a single spring. By distributing the mechanical load across multiple springs, each spring operates within its optimal design parameters, significantly extending the overall system lifespan and reducing maintenance frequency.
3Force
If the middle diameter of a single spring is reduced to increase spring force, then the spring force increases slightly, but the lifespan of the spring is seriously reduced and maintenance cost increases
Solution Approach 1:
The patent employs multiple springs with standard dimensions rather than reducing the middle diameter of a single spring. This approach achieves the required force output while maintaining springs within their optimal operational ranges, thereby extending service life and reducing maintenance costs.
Solution Approach 2:
The patent changes the system configuration from one spring to multiple springs, altering the fundamental parameter of spring quantity. This parameter change allows the use of springs with larger middle diameters and standard pitches, improving both lifespan and ease of maintenance.
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 multi-spring assembly provides greater spring force, ensuring effective nail firing while maintaining the lifespan and reducing maintenance needs, thus addressing the limitations of single-spring designs.
Implementation Method 1
the spring assembly is pushed into a contract state to store energy therein, and when the piston is free, the spring assembly expands to release the stored energy therein
Data Source
AI summary
A driving mechanism and a nail gun having the same. The driving mechanism includes a driving force supply unit comprising a frame structure having a front limiting seat and a rear limiting seat; a piston movably arranged between the front limiting seat and the rear limiting seat in the frame structure; a striker co-movably connected to the piston; and a spring assembly disposed between the piston and the rear limiting seat in the frame structure, configured such that when the piston is driven to move backward in the frame structure, the spring assembly is pushed into a contract state to store energy therein, and when the piston is free, the spring assembly expands to release the stored energy therein to push the piston to move forward in the frame structure so that the striker is co-moved therewith to strike a nail out of a muzzle.