Spray tip with seal ejector
AssigneeAsm Inc.
InventorOliver J. Calder
Life of this patent
Estimating the term…
Abstract
There is disclosed a spray tip useful for high pressure, airless spraying which has an orifice tip holder that is reversible between spraying and cleaning positions and that is interchangeable with other holders supporting orifice tips of varied diameters and capacities. The invention particularly provides a turret member as the orifice tip holder which has a size that permits it to be used as an ejector pin or member for removal of the seal from the spray tip. The turret member is sealed in the assembly by a floating seal in which the liquid line pressure provides the force to maintain the seal against the cylindrical member. The forward end of the floating seal has a seal face formed of a very hard, preferably reinforced plastic.
Claims24
A spray tip comprising:
- a. a body subassembly comprising a housing having a longitudinal through passageway extending from an inlet passage to an open discharge end, an intersecting orthogonal cylindrical bore, and adapter means attached to its end having said inlet passage for attachment of said body subassembly to a spray gun;
- b. a cylindrical turret member having a distal portion removably and rotatably seated in said intersecting orthogonal cylindrical bore of said housing, and having a transverse bore rotatable into alignment with said through passageway;
- and
- c. a spray tip orifice member mounted in said orthogonal cylindrical bore of said turret member;
- and
- d. a seal member axially having a seal through passageway and slidably received in said through passageway of said housing and being freely slidable into and out of said through passageway of said housing through said inlet passage thereof and including a turret member seal having a cylindrical concave seal surface facing said turret member;
- and with the diameter of said distal portion of said turret member having a diameter less than the diameter of said open end of said housing whereby said distal portion of said turret member can be inserted into the open end of said housing to abut said seal member and eject said seal member through said inlet passage.
A combination of a spray gun having a discharge barrel with an externally threaded discharge end and a spray tip received thereon and comprising:
- a. a spray tip subassembly including an outer, annular flange and an inlet passage on one end and a housing with an open discharge end opposite said one end and having a longitudinal chamber and an intersecting orthogonal cylindrical bore;
- b. a cylindrical turret member removably and rotatably seated in said intersecting orthogonal cylindrical bore of said housing, and having a transverse bore rotatable into alignment with said through passageway and a diameter less than the diameter of said open end of said housing whereby said turret member can also be inserted into the open end of said housing;
- c. a spray tip orific member mounted in said transverse bore;
- and
- d. a single seal subassembly axially slidably received in said longitudinal chamber and comprising:
- (i) a turret member seal formed of a hard, reinforced plastic received in said longitudinal chamber and having a rear face facing said inlet passage and a cylindrical concave seal surface facing said turret member with a central through passageway therebetween;
- and
- (ii) resilient means captured between said seal and the end of the barrel of said spray gun to bias said seal against said turret member;
- and
- e. a retainer nut received over said outer flange of said housing and threadably engaged onto said externally threaded end of said spray gun discharge barrel.
In a spray tip for the pressured spraying of liquids having a spray tip body with a through passageway with an inlet end to receive liquid under pressure and an outlet end to discharge liquid, and a receptacle which intersects said through passageway having at least one open end with a holder rotatably received in said open end of said receptacle and supporting a spray orifice within said through passage, and a seal slidably received within said through passageway and freely slidable into and out of said through passageway through said inlet end thereof and located between said inlet end of said body and said holder and having a sealing face which is compressed against said holder, the improvement which comprises:
- providing said holder with a lesser diameter than said passageway and said seal, whereby said holder may be removed from its receptacle and inserted through said discharge end of said through passageway to eject said seal from the inlet end of said through passageway.
the spray tip of claim I8 including resilient means positioned to bias said seal against said turret member.
Dependencies are inferred from the claim text.