Patent ID: 7090148

Claim:
A gravity fed liquid spraying apparatus comprising: a spray gun having a through liquid passageway for liquid to be sprayed by said spraying apparatus, and including a connector portion having a cylindrical surface having an axis and defining a bore having an outer end opening through a topside of the spray gun and an inner end communicating with said liquid passageway, said connector portion including a first coupling member external of the bore, adjacent the outer end of the bore, and fixed relative to the cylindrical surface defining the bore; a liquid supply assembly including walls forming a liquid supply chamber and a cylindrical portion, said cylindrical portion having an axis, a proximal end fixed to one of said walls forming the liquid supply chamber, an opposite distal end, and a through liquid passageway between said proximal and distal ends and communicating with said liquid supply chamber, said cylindrical portion being adapted to be received coaxially in the bore of said connector portion in an engaged position with said distal end of the cylindrical portion adjacent said inner end of the bore, said liquid supply assembly comprising a unitary assembly including said cylindrical portion, said one of said walls to which the proximal end of said cylindrical portion is fixed, and a second coupling member fixed on the unitary assembly relative to the cylindrical portions, said first and second coupling members being shaped and positioned so that with said cylindrical portion and said cylindrical surface coaxial, said cylindrical portion together with the second coupling member can be rotated about said axes relative to the surface defining the bore and said first coupling member between (1) a first relative rotated position at which the cylindrical portion can be moved into said bore to said engaged position in one axial direction and withdrawn from the bore in an opposite axial direction while the first and second coupling members are in relative positions to move past each other, and (2) a second relative rotated position at which, with the cylindrical portion and the surface defining the bore in the engaged position with the cylindrical portion within the bore, the coupling members are engaged with each other to retain the cylindrical portion in the bore; and sealing means for providing liquid tight engagement between the cylindrical portion of the liquid supply assembly and the cylindrical surface defining the bore when the cylindrical portion is within the bore in said engaged position.