Nozzle guard for airless spray pistols

Claim 2

A spray pistol which comprises a body having an externally threaded tubular projection receiving therethrough from the body, material to be sprayed, a nozzle tip with a spray pattern defining orifice overlying the outboard of said tubular projection, a seal between said tip and said projection, a tubular guard surrounding the inboard end of said nozzle tip and projecting therefrom to a free end substantially downstream from said orifice, a tip nut embracing the inboard end of said guard and threaded on said tubular projection for pressing said guard against said tip and said tip and seal against said tubular projection, and overlapping ledge and flange abutments between the tip and guard and the guard and tip nut with clearance between the tip and tip nut ledge and flange whereby said nozzle tip and seal will not be pressed against said projection unless said guard is in position around said nozzle tip.

Claim 3

A spray pistol for airless spraying having a pistol-like body with internal passageways porting pumped fluid from a passage inlet to a nozzle outlet, a trigger controlled valve in said passageway controlling the flow of fluid therethrough, the nozzle comprising a nozzle tip asssembly including an orifice defining member closing said passageway with a slot orifice therethrough, the nozzle tip assembly attached to the body by a tip nut having a threaded bore therethrough engaging a threaded passageway defining portion of the pistol, the bore having a reduced inner diameter end portion, a guard member having an elongated hollow body with an enlarged outer diameter end portion, the guard member received interior of said nut and projecting from an open end thereof, and terminating in a free end, the enlarged end portion of the guard member retained in the tip nut by the reduced inner diameter of the tip nut, the nozzle tip assembly received interior of the guard member adjacent the enlarged end portion with the orifice discharging interiorly of the projecting portion guard member towards the free end, overlapping flange means between the tip assembly and the guard limiting axial movement of the nozzle tip assembly towards the free end, face mating means restricting rotational movement of the holder member within the guard, the guard member projecting beyond the orifice a distance greater than approximately 5/8 inch and sufficient to prevent injection of human flesh by the discharge from the orifice when the flesh is located at the free end, the overlapping flange means and the reduced inner diameter end of the tip nut being dimensioned such that the tip assembly is held on the pistol by the tip nut only when the guard is interposed between the tip assembly and the tip nut.

Claim 4

A spray pistol for airless spraying having a pistol-like body with internal passageways porting pumped fluid from a passage inlet to a nozzle outlet, a trigger controlled valve in said passageway controlling the flow of fluid therethrough, the nozzle comprising a nozzle tip asssembly including an orifice defining member closing said passageway with a slot orifice therethrough, the nozzle tip assembly attached to the body by a tip nut having a threaded bore therethrough engaging a threaded passageway defining portion of the pistol, the bore having a reduced inner diameter end portion, a guard member having an elongated hollow body with an enlarged outer diameter end portion, the guard member received interior of said nut and projecting from an open end thereof, and terminating in a free end, the enlarged end portion of the guard member retained in the tip nut by the reduced inner diameter of the tip nut, the nozzle tip assembly received interior of the guard member adjacent the enlarged end portion with the orifice discharging interiorly of the projecting portion guard member towards the free end, overlapping flange means between the tip assembly and the guard limiting axial movement of the nozzle tip assembly towards the free end, face mating means restricting rotational movement of the holder member within the guard, the guard member projecting beyond the orifice a distance greater than approximately 5/8 inch and sufficient to prevent injection of human flesh by the discharge from the orifice when the flesh is located at the free end, the overlapping flange means and the reduced inner diameter end of the tip nut being dimensioned such that the tip assembly is held on the pistol by the tip nut only when the guard is interposed between the tip assembly and the tip nut.

Claim 5

The improvement of claim 2 wherein the orifice has a non-circular cross-section discharge pattern, the guard member has an internal dimension downstream of the orifice aligned with the major diameter which is less than the major diameter of the pattern, the hollow body having a discontinuous wall downstream of the nozzle providing opposed axially extending slots aligned with the major diameter through which peripheral portions of the pattern project.