Balanced Spool Blow Gun for Low-Force Trigger Control
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Solution Overview
Problem
Conventional blow guns are inefficient in reducing noise and energy consumption, and their design often leads to repetitive strain injuries due to high trigger force requirements, complex assembly, and increased power consumption, especially as pressure increases.
Innovation Solution
A blow gun design featuring balanced piston heads and a curved spool with a silenced nozzle and anti-backflow valve, made from durable materials like glass fiber reinforced polymers, which reduces pressure effects on the trigger force and simplifies assembly, while the nozzle design minimizes energy consumption and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the compression pressure is increased to improve blowing force, then the blowing effectiveness is improved, but the force required for controlling the blow intensity increases, causing repetitive strain injuries
Solution Approach 1:
The patent applies the counterweight principle by designing a balanced piston system where the first piston head and second piston head have equal diameters and experience equal opposing forces from the pressurized medium. This balance counteracts the effect of compression pressure on the trigger force, allowing high blowing force while maintaining constant, low trigger control force regardless of pressure increases
Solution Approach 2:
The patent changes the structural parameters of the valve system by introducing two piston heads with equal working areas and connecting them through a rod. This parameter configuration ensures that the forces acting on the piston heads are equal and opposite, thereby decoupling the trigger force from the compression pressure and enabling independent optimization of blowing force and trigger control
2Adaptability or versatility
If many components are used to achieve valve functionality, then the valve can be activated and deactivated, but the probability of reduced lifetime increases and assembly becomes more complicated
Solution Approach 1:
The patent merges multiple components into integrated structures to reduce overall complexity. The spool is integrated with the trigger mechanism, and the piston heads are connected through a rod to form a unified balanced valve system. This consolidation reduces the number of separate components while maintaining full valve activation and deactivation functionality
Solution Approach 2:
The spool serves multiple functions simultaneously: it acts as a sealing element, a connection member for the trigger mechanism, and part of the valve control system. The piston rod connects both piston heads and transmits the balanced forces, serving as both a structural support and a force transmission element, thereby reducing the need for separate components
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 design significantly reduces the risk of repetitive strain injuries, simplifies assembly, lowers energy consumption, and decreases noise levels, resulting in a more efficient and ergonomic working environment with improved blowing precision and force.
Implementation Method 1
the two piston heads being balanced, i.e. being of the same diameter and/or working area... the pressurized air supplied to the blow gun will enter into the tubular space between the two piston heads and will act on them with equal forces in opposite directions
Data Source
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AI summary
A compressed air blow gun comprises a valve having a spool (41) movable in a cylinder (203). The spool (41) has two piston heads (411, 413) spaced from each other along a piston rod (412). The pressurized air is fed to a space (414) between the two piston heads (411, 413), whereby the spool (41) is pressure balanced, and a trigger (40) is connected to the spool (41) for moving it in the cylinder (203) unaffected by the force from the pressurized air. Upon pulling the trigger (40), the spool (41) moves to uncover an outlet (211') to permit the air to pass to a nozzle (33). The blow gun brings about an improved working environment, e.g. by reducing the risk of causing a repetitive strain injury. In preferred embodiments,the spool (41) and the trigger (40) are an integral unit (4), the spool (41) and the cylinder (203) are curved, the number of components is reduced, the assembling is facilitated, the nozzle (30) is a silenced nozzle,and a filtering anti backflow valve (5) is provided in an air inlet passage (201) to the blow gun.