Air Gun Blowback Mechanism Simplification
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Solution Overview
Problem
Conventional air guns with blowback mechanisms have complex structures that lead to durability issues and reduced accuracy due to the involvement of multiple moving parts like hammers, shears, and trigger bars, and the energy used for firing a bullet during cylinder retreat affects grouping precision.
Innovation Solution
The air gun design eliminates the need for a hammer and associated components, utilizing compressed gas to shoot a bullet before the cylinder retreats, thereby simplifying the mechanism and improving durability and accuracy by using the slide's retreat energy more effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hammer and associated components are used in the blowback mechanism, then the air gun can perform blowback and fire bullets, but the structure becomes complex leading to durability issues and reduced accuracy
Solution Approach 1:
The patent removes the hammer and its associated components (shears, trigger bars) from the blowback mechanism. The blowback function is achieved directly by the rearward movement of the slide/cylinder assembly under gas pressure, eliminating the need for a separate hammer striking mechanism. This extraction of unnecessary components directly resolves the contradiction by simplifying the structure while maintaining reliability.
Solution Approach 2:
The patent merges the blowback function and the firing function into a single integrated mechanism. The slide's rearward movement simultaneously performs the blowback action and triggers the bullet discharge through the valve pin mechanism, eliminating the need for separate hammer and trigger components. This merging reduces structural complexity while improving durability.
2Measurement precision
If energy is used for firing a bullet during cylinder retreat, then the bullet is discharged, but the accuracy and grouping precision deteriorates
Solution Approach 1:
The patent implements preliminary action by discharging the bullet before the cylinder completes its rearward retreat. The valve pin opens the gas passage to fire the bullet while the cylinder is still moving forward or at the peak of its motion, not during the retreat phase. This timing separation ensures that the energy used for bullet discharge does not interfere with the cylinder's retreat motion, thereby maintaining shooting accuracy and grouping precision.
Data Source
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AI summary
The structure of air guns with a conventional blowback mechanism was complicated because they had a hammer, shear, trigger bar, bullet supply nozzle, bullet supply nozzle link, etc. These members operated every time when a bullet was shot resulting in the members being readily worn, with failure often occurring as well as problems with durability. In order to solve these problems, the valve body (17) has a valve body air chamber (17a) sealed to contain the compressed gas supplied from the compressed gas source (A), and has a discharge valve (19) which can move in a longitudinal direction. The discharge valve (19) has a valve through hole (190) that passes completely from the muzzle to the gun rear end direction, and a gas supply port (19b) that can open and close the valve body air chamber (17a) and valve through hole (190) by the movement of the discharge valve (19) in the longitudinal direction. Retreat of the inner barrel (5) opens the gas supply port (19b) of the discharge valve (19) to shoot a bullet (W) and perform blowback.