Nail Gun Barrel Ejector Segmentation for Clearance Control
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Solution Overview
Problem
Existing nail-driving gun barrel assemblies face challenges in controlling tolerances between the barrel and ejector, leading to large clearances that compromise safety and efficiency due to deformation from explosive recoil and difficulty in manufacturing precision.
Innovation Solution
A nail-driving gun barrel assembly with a cylindrical ejector and barrel design featuring axially extending grooves and recesses that allow for precise sliding and improved mechanical strength, enabling easier assembly and disassembly, and enhanced safety by minimizing clearance and preventing deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an L-shaped ejector is used with a cutout surface and bottom slot configuration, then the ejector can be designed with simple geometry, but the clearance between the cutout surface and ejector top end becomes difficult to control, resulting in large clearances that compromise safety
Solution Approach 1:
The ejector is divided into two separate components: a cylindrical segment retained in the barrel and a block segment that slides on the cylindrical segment. This segmentation allows each component to be manufactured independently with precise dimensional controls, eliminating the tolerance accumulation issues of the monolithic L-shaped design while maintaining manufacturing simplicity.
Solution Approach 2:
The block segment is nested on the cylindrical segment, with the block segment sliding axially along the cylindrical segment. This nested configuration provides inherent tolerance compensation and ensures consistent clearance control between the ejector assembly and the barrel's cutout surface, while allowing easy assembly and disassembly.
2Object-affected harmful factors
If the clearance between the cutout surface and ejector top end is reduced for safety, then explosive residue containment is improved, but the manufacturing tolerance control becomes more difficult and costly
Solution Approach 1:
By segmenting the ejector into two independently manufactured components (cylindrical segment and block segment), each with controlled tolerances, the assembly achieves consistent small clearance without requiring extremely tight tolerances on a single complex component. This reduces manufacturing cost while ensuring safety.
Solution Approach 2:
The cylindrical segment acts as an intermediary element between the barrel and the block segment. It provides a precise reference surface that mediates the clearance control between the barrel's cutout surface and the ejector's top end, ensuring consistent small clearance while simplifying manufacturing requirements.
3Ease of manufacture
If the ejector structure is simplified for ease of manufacture, then production cost is reduced, but the ejector becomes susceptible to deformation from explosive recoil impact
Solution Approach 1:
The ejector is segmented into a cylindrical segment that remains fixed in the barrel and a block segment that moves during ejection. This segmentation allows the cylindrical segment to be optimized for strength and rigidity to resist recoil deformation, while the block segment handles the ejection motion, achieving both strength and manufacturing simplicity.
Solution Approach 2:
The cylindrical segment and block segment are combined to form the complete ejector assembly. The cylindrical segment provides structural strength and rigidity to withstand explosive recoil, while the block segment provides the ejection function. Together they achieve both strength and ease of manufacture.
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 solution achieves higher precision in manufacturing, reduces the risk of explosive residue entering the action housing, enhances mechanical strength, and extends the service life of the ejector by maintaining structural integrity during explosive impacts.
Implementation Method 1
a powder chamber 122 for receiving an explosive cartridge 10
Implementation Method 2
the explosion of the explosive cartridge 10 may result in fast recoil movement
Implementation Method 3
The sleeve part is coaxially and slidably sleeved on and in sliding contact with the cylindrical segment
Implementation Method 4
The sleeve part is coaxially and slidably sleeved on and in sliding contact with the cylindrical segment
Data Source
AI summary
A nail-driving gun barrel assembly includes an axially extending barrel and an ejector. The barrel has a firing end portion having a cylindrical segment and a protruding segment that cooperates with the cylindrical segment to define a first cutout recess. The protruding segment is formed with a first groove. The ejector has a sleeve part and a projecting part which cooperates with the sleeve part to define a second cutout recess. The sleeve part is coaxially and slidably sleeved on the cylindrical segment. The projecting part is formed with a second groove. When the ejector is disposed at a first axial position, the first and second grooves mate each other.