Why not design a Spray-Gun? Before CAD programs became common I used an airbrush to visualize designs or ideas. Here I combined the knowledge from the interior of an airbrush into a realistic design of a spray-gun. Hope you enjoy my work. Drawing time about 20 hours.
Design of an airbrush like paint spray gun with good control to proportion the paint feed to the nozzle. All parts must be durable and easy to clean (in a solvent for example), replaceable parts (especially for the parts that wear like the O-rings and seals).
SPREE-GUN by BV
Rendering above shows details of the connection method. Small round spring through a hole in a connection pin as security pins. These connect the trigger handle to the needle. The needle protrudes 2 mm out of the nozzle (opening 0.3 mm).
Needle assembly. The needle is pushed by a spring against the nozzle opening. The spring pressure can be adjusted by the needle spring retainer cap on the left of the drawing. The spring pressure closes the paint feed completely.
The paint side is sealed of from the air side by three leather rings. The O-ring (here in light gray) seals the paint side from the outside. Both O-ring and leather seals will wear over time but are easy and cheap to replace.
Assembly order for needle assembly.
Completely assembled.
