An articulated and extendible rotary head for use with a pressurized air jet spray gun comprising a coupling between two types of articulated rotary modules for bent use on corners or edges of a body to be pulverised,
- wherein a first module is a supporting hollow clamp module comprising an end and formed as a quadrilateral with curved arched sides,
- wherein a center of the supporting hollow clamp module has a projection with two anchor rotating screws for anchoring the supporting hollow clamp module on a body of a pressurized air jet spray gun or on another preceding clamp module and two other anchor rotating screws on a perpendicular axial axis for joining the supporting hollow clamp module to a next intermediate module to support following modules and to allow the articulated rotation of every module in a left or right direction or up and down,
- wherein through the supporting hollow clamp module extends a channelling bellows that channels a liquid to be sprayed,
- wherein inside the channelling bellows extends a flexible high-tenacity traction wire made of steel or industrial nylon, hollow air supply hoses, and an outlet blocking needle which comprises a tip located at the front part of the outlet blocking needle, and a cylindrical rod located at the rear part of the outlet blocking needle, the tip and the cylindrical rod being joined by the flexible high-tenacity traction wire,
- wherein a second module is a nozzle front-end module anchored in the end of the supporting hollow clamp module by means of the two other anchor rotating screws to the supporting hollow clamp module, wherein the anchoring is articulated, and wherein the nozzle front-end module is supported on the supporting hollow clamp module,
- wherein the nozzle front-end module is a hollow truncated cylinder joined by means of the flexible channelling bellows to a cartridge of the liquid to be sprayed, wherein the cartridge houses the flexible high-tenacity traction wire, wherein the nozzle front-end module comprises outlets for the outlet of pressurized air, the outlets being located in a rear external face of the nozzle front-end module and connected to the hollow air supply hoses able to prevent ruptures,
- wherein the nozzle front-end module comprises a central outlet for the outlet of the liquid to be sprayed, wherein the central outlet is blocked by the tip of the outlet blocking needle, and wherein the tip of the outlet blocking needle can be extracted from the central outlet by pulling a trigger from a back end releasing a spray jet of liquid to be sprayed impelled by pressurized air,
- wherein the tip of the outlet blocking needle is located in a guide with a recovery spring to relocate the tip in a obstructing position when the pulling of the trigger ends, and
- wherein the cylindrical rod of the outlet blocking needle is located in the body of the pressurized air jet spray gun, retracts and causes backward traction by means of the trigger, bends an axis of the outlet blocking needle when the nozzle front-end module rotates, thus bending the articulated and extendible rotary head to adapt the liquid to be sprayed to the rear part of corners and edges of the body to be pulverised.