Spray gun with selective hydraulic and air assisted operating modes

A hand-held spray gun comprising a handle section having a liquid inlet and a pressurized air inlet, a barrel section including an elongated tube mounted forwardly of said handle section, a nozzle section mounted at a forward end of said barrel section, said nozzle section having a spray discharge orifice, liquid conduit means in said barrel section tube for communicating liquid from said liquid inlet to said nozzle section, said barrel tube and liquid conduit means defining an air passageway through said barrel section communicating between said pressurized air inlet and said nozzle section, a trigger mounted on said handle section for movement between a deactuating position and an actuating position, said nozzle section including a nozzle housing and a valve follower, said nozzle housing having a liquid passage and an air passage, and said valve follower being operable in response to movement of said trigger from said deactuating position to said actuating position for permitting communication of liquid from said liquid inlet through said liquid conduit means and nozzle housing liquid passage and out said nozzle section discharge orifice and for permitting the communication of air from said pressurized air inlet and through said barrel section air passageway, nozzle housing air passage and nozzle section discharge orifice whereby an air assisted, atomized liquid spray is discharged from said nozzle section discharge orifice.

A hand-held spray gun comprising a handle section having a liquid inlet, a nozzle section mounted forwardly of said handle section, said nozzle section including a spray tip, a nozzle housing adjacent a downstream end of said gun, and a valve follower disposed adjacent said nozzle housing, said nozzle housing having a liquid flow passage with a discharge orifice on a downstream end thereof and at least one air flow passage with an air discharge orifice in adjacent relation to said liquid discharge orifice, said spray tip having a plurality of spray orifices, means for adjustably mounting said spray tip on said nozzle housing with a selected one of said spray orifices in operative position aligned with said nozzle housing liquid discharge orifice, liquid conduit means communicating between said liquid inlet and an upstream end of said nozzle housing, pressurized air flow passage means communicating between said pressurized air inlet and an upstream end of said nozzle housing, a trigger mounted on said housing for actuating movement between actuating and deactuating positions, and said valve follower being movable in response to actuating movement of said trigger from a first position at which said valve follower simultaneously prevents direction of pressurized air and liquid through said operatively aligned spray tip orifice from said nozzle housing air and liquid passages respectively to a second position which permits communication of liquid to said operatively aligned spray orifice from said liquid inlet, liquid conduit means, and nozzle housing liquid passage and simultaneously permits the communication of pressurized air from said air inlet through said air flow passage means, and nozzle housing air passage whereby an air assisted atomized liquid spray is discharged from said operatively aligned spray tip discharge orifice.

A hand-held spray gun comprising a handle section having a liquid inlet, a nozzle section mounted forwardly of said handle section, said nozzle section including a spray tip, a nozzle housing, and a valve follower, said nozzle housing having a liquid flow passage with a discharge orifice on a downstream and thereof and at least one air flow passage with an air discharge orifice in adjacent relation to said liquid flow passage discharge orifice, said spray tip having a plurality of spray orifices, means for adjustably mounting said spray tip on said nozzle housing with a selected one of said spray orifices in operative position aligned with said nozzle housing liquid flow passage discharge orifice, liquid conduit means communicating between said liquid inlet, and an upstream end of said nozzle housing, said liquid inlet, liquid conduit means, and nozzle housing liquid flow passage discharge orifice being in a substantially straight line, means defining a pressurized air inlet, pressurized air flow passage means communicating between said pressurized air inlet and an upstream end of said nozzle housing, a trigger mounted on said housing for actuating movement between actuating and deactuating positions, and said valve follower being movable in response to actuating movement of said trigger from a first position which prevents direction of pressurized air and liquid through said operatively aligned spray tip orifice from said nozzle housing liquid passage and said at least one air passage to a second position which permits communication of liquid to said operatively aligned spray tip orifice from said liquid inlet, liquid conduit means, and nozzle housing liquid passage and which permits the communication of pressurized air from said air inlet, air flow passage means, and said at least one nozzle housing air passage whereby an air assisted atomized liquid spray is discharged from said operatively aligned spray tip orifice.

A hand-held spray gun comprising a handle section having a liquid inlet, a nozzle section mounted forwardly of said handle section, said nozzle section including a spray tip, a nozzle housing, and a valve follower, said nozzle housing having a liquid flow passage with a discharge orifice on a downstream end thereof and at least one air flow passage with an air discharge orifice in adjacent relation to said liquid discharge orifice, said spray tip having a plurality of spray orifices, means for adjustably mounting said spray tip on said nozzle housing with a selected one of said spray tip orifices in operative position aligned with said nozzle housing liquid flow passage discharge orifice, liquid conduit means communicating between said liquid inlet and an upstream end of said nozzle housing, means defining a pressurized air inlet, pressurized air flow passage means communicating between said pressurized air inlet and an upstream end of said nozzle housing, a trigger mounted on said housing for actuating movement between actuating and deactuating positions, said valve follower being movable in response to actuating movement of said trigger from a first position which prevents direction of pressurized air and liquid through said operatively aligned spray tip orifice from said valve housing liquid passage and said at least one air flow passage to a second position which permits communication of liquid to said operatively aligned spray tip orifice from said liquid inlet, liquid conduit means, and valve housing liquid passage and which permits the communication of pressurized air from said air inlet, air flow passage means, and said at least one nozzle housing air passage whereby an air assisted atomized liquid spray is discharged from operatively spray tip discharge orifice, and said spray tip and nozzle housing defining a mixing and expansion chamber into which said nozzle housing liquid flow passage and said at least one air flow passage communicate for enhancing breakdown and atomization of liquid prior to direction through said operatively positioned spray tip orifice.

A hand-held spray gun comprising a handle section having a liquid inlet, a nozzle section mounted forwardly of said handle section, said nozzle section including a spray tip, a nozzle housing, and a valve follower, said nozzle housing having a liquid flow passage with a discharge orifice on a downstream end thereof and at least one air flow passage with an air discharge orifice in adjacent relation to said liquid flow passage discharge orifice, said spray tip having a plurality of spray orifices, means for adjustably mounting said spray tip on said nozzle housing with a selected one of said spray tip orifices in operative position aligned with said nozzle housing liquid flow passage discharge orifice, liquid conduit means communicating between said liquid inlet and an upstream end of said nozzle housing, means defining a pressurized air inlet, pressurized air flow passage means communicating between said pressurized air inlet and an upstream end of said nozzle housing, a trigger mounted on said housing for actuating movement between actuating and deactuating positions, said valve follower being movable in response to actuating movement of said trigger from a first position which prevents direction of pressurized air and liquid through said operatively aligned spray tip orifice from said valve housing liquid passage and said at least one air flow passage to a second position which permits communication of liquid to said operatively aligned spray orifice from said liquid inlet, liquid conduit means, and spray housing liquid passage and which permits the communication of pressurized air form said air inlet, air flow passage means, and said at least one valve nozzle housing air passage, and said spray tip including an annular sealing member surrounding the upstream end of at least one of said spray tip orifices, and upon positioning of said at least one nozzle tip orifice into said operative position said spray tip sealing member is engageable with said nozzle housing to block the discharge of pressurized air therethrough thereby enabling the gun to operate in a hydraulic non-air assisted spraying mode.