Liquid supply container for an atomizing spray gun

Claim 1

A pressure-resistant liquid container for a spray gun with said container having an integral extension with a coaxial cylindrical bore therethrough terminating in an outer edge normal to the axis of said bore, a lock projection integral with said extension extending a predetermined distance inward from each opposite side of the surface of said bore, a hollow cylindrical plug of predetermined flexibility having a closed upper end and frictionally engaged in said bore including an integral outer end flange or predetermined thickness normal to the said axis and adjacent said outer edge of said extension, a gas-propellant inlet hole through the said upper end of said plug, a liquid-conducting outlet hole through said upper end of said plug adjacent said inlet hole and a liquid-conducting nipple having a coaxial hole therethrough extending downward from said upper end of said plug connecting said outlet hole with said coaxial hole through said nipple, a dip tube with the upper end thereof connected to said liquid conducting nipple and extending downward with the lower end thereof in close proximity to the bottom of said container, said plug having a bifurcated lower portion with an aperture in each branch for locking engagement with each corresponding said projection when each said opposite side is flexed inward by camming over each said projection when said plug is inserted in said bore whereby said plug will resist removal from said bore, a tube-coupling insert having a body of predetermined thickness to mate with the upper surface of said plug, a first propellant gas-conducting nipple integral with said body extending downward through said inlet hole in said plug, a second propellant gas-conducting inlet nipple integral with and extending upward from said body with the bore therein coaxial with and joining the bore in said first gas-conducting nipple, a liquid-conducting outlet nipple integral with and extending upward from said body with the bore therein extending through the lower surface of said body and in register with the said liquid-conducting hole in the said plug, a cap having an inward projecting flange secured around the outer end of said extension of said container to retain said insert and said plug in hermetic relation to said extension, a flexible tube connected to said first gas-conducting nipple for connection to a source of pressurized gas propellant, a flexible liquid outlet tube connected to said liquid nipple for connection to a spray gun and conducting liquid thereto and a disc disposed between the insert and plug and of larger diameter than the plug flange, the disc having an opening therethrough registering with the liquid-conducting openings and a second opening through which the nipple of the insert extends.