Spray gun and nozzle assembly attachment

A liquid spray gun body comprising a captured rotatable locking ring adapted to allow connection of a compatible liquid spray gun nozzle assembly,

• wherein the liquid spray gun body is free of passages for a coating liquid,
• wherein the captured rotatable locking ring comprises a first camming lug adapted to interact with a first camming surface on the compatible liquid spray gun nozzle assembly,
• wherein the captured rotatable locking ring comprises a second camming lug adapted to interact with a second camming surface on the compatible liquid spray gun nozzle assembly,
• wherein the captured rotatable locking ring is rotatable to an assembly position and a locked position, wherein,
• in the assembly position, the compatible liquid spray gun nozzle assembly is installable and removable;
• and
• in the locked position, the compatible liquid spray gun nozzle assembly is lockable against the liquid spray gun body.

A method of using a liquid spray gun assembly the liquid spray gun assembly comprising:

• a liquid spray gun nozzle assembly comprising
• a coating liquid inlet portion comprising a liquid connector for connection to an external liquid source;
• a coating liquid outlet portion comprising a liquid nozzle for spraying a coating liquid fed into the nozzle assembly through the coating liquid inlet portion, the liquid nozzle being disposed along a spray axis;
• a coating liquid flow path fluidly connecting the coating liquid inlet portion to the liquid nozzle;
• a spray gun connection portion opposite the coating liquid outlet portion adapted to connect the liquid spray gun nozzle assembly to a compatible liquid spray gun body, the spray gun connection portion comprising an outer wall comprising a radially-outward facing surface;
• a first camming member disposed on the radially-outward facing surface and comprising a first end, a second end, and a first camming surface facing the coating liquid outlet portion;
• a first access window proximate the first end of the first camming member,
• wherein the first camming surface is adapted to interact with a complementary camming lug on the compatible liquid spray gun body to pull the liquid spray gun nozzle assembly along the spray axis and against the compatible liquid spray gun body without rotation of the liquid spray gun nozzle assembly;
• and
• a liquid spray gun body comprising a captured rotatable locking ring adapted to allow connection of the liquid spray gun nozzle assembly,
• wherein the liquid spray gun body is free of passages for a coating liquid,
• wherein the captured rotatable locking ring comprises a first camming lug adapted to interact with the first camming surface on the liquid spray gun nozzle assembly,
• wherein the captured rotatable locking ring is rotatable to an assembly position and a locked position, wherein, in the assembly position, the liquid spray gun nozzle assembly is installable and removable;
• and
• in the locked position, the liquid spray gun nozzle assembly is lockable against the liquid spray gun body;
• the method comprising:
• placing the captured rotatable locking ring into the assembly position;
• aligning the first camming lug with the first access window;
• translating the liquid spray gun nozzle assembly along the spray axis to cause the first camming lug to pass through the first access window;
• rotating the captured rotatable locking ring about the spray axis to cause the first camming lug to engage the first camming surface;
• and
• continuing rotation of the captured rotatable locking ring into the locked position to cause the liquid spray gun nozzle assembly to be locked in sealing relation against the liquid spray gun body.