Attachment for paint spray gun systems

Claim 1

An attachment for a spray painting apparatus comprising a spray gun and an open-mouth paint cup, a lid seated on said paint cup to close the same with a peripheral seal against leakage, said lid having a vent opening therein, a delivery tube extending from the lower side of said paint cup to said spray gun, means to attach said delivery tube to said lid for removal therewith.Iadd., said attaching means including a locknut; .Iaddend.said attachment consisting of a diaphragm having a peripheral flange for engagement between the peripheral seal of said lid and said paint cup, a downwardly extending wall inwardly of said flange and of progressively increasing length forming with said diaphragm a chamber that is deeper at one side than at the opposite side, said deeper side being oriented away from the vent opening in said lid and having a second vent opening in the lower surface thereof, and means in the center portion of said diaphragm to engage said delivery tube and delivery tube .[.retaining.]. .Iadd.attaching .Iaddend.means in a substantially liquid-tight connection .Iadd.said engaging means including a formed boss which mates with said locknut for maintaining said diaphragm second vent opening in a spaced relationship to said lid vent opening..Iaddend.