Patent ID: 7578454

Claim:
A spray device for fire fighting, comprising: an upper body, comprising: a through hole provided in a center of an upper part of the upper body, with a first internal thread provided on an inner surface of the through hole; a stopper protruding to an outside from an intermediate portion of an outer surface of the upper body; and a first outer thread provided around a lower portion of the outer surface of the upper body, with a first annular groove provided around the lower portion of the outer surface of the upper body over the first outer thread of the upper body; a lower body removably coupled to the upper body, and comprising: a second annular groove and a second internal thread provided on an inner surface of the lower body at positions corresponding to the first annular groove and the first outer thread of the upper body, respectively; a plurality of spray channels extending downwards from a first inclined surface provided in a center of the lower body; and a plurality of nozzle tip holes each communicating with each of the plurality of spray channels, with a third internal thread provided on an inner surface of each of the nozzle tip holes; a plurality of nozzle tips removably inserted into the nozzle tip holes, and comprising: a bolt head to allow the nozzle tip to be removably inserted into the nozzle tip hole, with an orifice defined in a center of the bolt head; a second outer thread provided on an outer surface of the nozzle tip to engage with the third internal thread of the nozzle tip hole; and a swirl inserted into the nozzle tip and provided by twisting two wires; and an interposition unit comprising an O-ring seated in the first and second annular grooves of the upper and lower bodies, wherein the spray device further comprises a hemispherical mesh having a convex shape, constituting the interposition unit and placed in a chamber, the chamber being defined at a center position between the upper body and the lower body; the upper body further comprises a second inclined surface with an enlarged diameter extending from a lower end of the through hole of the upper body to a lower part of the upper body and a tightening contact surface provided on an outer surface of a circular head part which comprises the upper part of the upper body; and the lower body further comprises a working groove provided on the inner surface of the lower body under the second internal thread of the lower body to allow the second internal thread to be formed on the inner surface of the lower body.