US3414196A - Self-cleaning tip for airless spray guns - Google Patents

Self-cleaning tip for airless spray guns Download PDF

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Publication number
US3414196A
US3414196A US607992A US60799267A US3414196A US 3414196 A US3414196 A US 3414196A US 607992 A US607992 A US 607992A US 60799267 A US60799267 A US 60799267A US 3414196 A US3414196 A US 3414196A
Authority
US
United States
Prior art keywords
orifice
slide
plunger
slider
coating material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US607992A
Other languages
English (en)
Inventor
Thomas B Legeza
William D Gauthier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DeVilbiss Co
Original Assignee
DeVilbiss Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by DeVilbiss Co filed Critical DeVilbiss Co
Priority to US607992A priority Critical patent/US3414196A/en
Priority to DE19671621857 priority patent/DE1621857A1/de
Priority to GB55869/67A priority patent/GB1141580A/en
Priority to CH1766567A priority patent/CH462004A/de
Priority to FR1550724D priority patent/FR1550724A/fr
Application granted granted Critical
Publication of US3414196A publication Critical patent/US3414196A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/01—Spray pistols, discharge devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/14—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening
    • B05B1/16—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening having selectively- effective outlets
    • B05B1/1627—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening having selectively- effective outlets with a selecting mechanism comprising a gate valve, a sliding valve or a cock
    • B05B1/1663—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening having selectively- effective outlets with a selecting mechanism comprising a gate valve, a sliding valve or a cock by relative translatory movement of the valve elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/32—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages in which a valve member forms part of the outlet opening
    • B05B1/326—Gate valves; Sliding valves; Cocks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B05B15/52—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter for removal of clogging particles
    • B05B15/531—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter for removal of clogging particles using backflow
    • B05B15/534—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter for removal of clogging particles using backflow by reversing the nozzle relative to the supply conduit

Definitions

  • This invention comprises a nozzle assembly for a high pressure airless-type spray gun in which the very small discharge orifice is subject to clogging, thereby radically altering the spray pattern and fluid discharge rate of the gun.
  • a slider is provided which may be removed in a direction transverse to the axis of the spray gun, reversed and replaced so that the clogged orifice may be cleaned by material flow in a reverse direction.
  • the slider may also be adjusted transversely to bring different ones of a plurality of discharge orifices into operative position.
  • a hydraulically actuated seal prevents leakage at the interface between the slider and the guide ways of the assembly in which it moves.
  • a removable or interchangeable orifice may be associated with a spray gun body by mounting it on a transverse slide mechanism wherein the high pressure of the coating material is utilized to effectively urge a flat seal against the slide to prevent leakage around the gun discharge orifice.
  • a means for quickly reducing the high pressure effecting the seal enables removal. reversal and reinsertion of the orifice slide for cleaning a clogged or partially clogged orifice by flow of fluid in a reverse direction.
  • Incorporated in the slide may be a plurality of different sized discharge orifices which may be selectively placed in operative position by movement of the slide in a direction transverse to the direction of movement of the coating material or to the axis of the gun.
  • the invention includes a body assembly adapted to be attached to a conventional airless type spray gun with a movable sealing plunger adapted for slight movement along the axis of the spray gun between a first position away from the transversely guided orifice slide to a second position in contact with the orifice slide.
  • the orifice slide is received by guide ways in the body assembly in either a forward position for normal spraying or reverse position in which a clogged orifice can be cleaned, and can be selectively positioned along the guide ways in either position in order to bring any one of a plurality of orifices carried by the slide into operative position.
  • FIG. 1 is a view in elevation, partly in cross section, of the reversible tip nozzle assembly of this invention associated with a conventional airless spray gun, showing the removable slide mechanism positioned within its holder assembly, and the relationships between the valve mechanism of the gun body and the sealing plunger within the holder assembly;
  • FIG. 2 is a cross-sectional view of the orifice slider and holder assembly of this invention, indicating the path of liquid flow past the open valve of the gun assembly and through one of the orifices in the slider; the parts being in reversed position as during a cleaning operation;
  • FIG. 3 is a front view of the slider and gun, taken along line 3-3 of FIG. 2, and showing the position of the orifices within the slider;
  • FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 3 but with the orifice slider removed;
  • FIG. 5 is a view in elevation of an orifice slider removed from the holder assembly.
  • the reversible tip assembly is shown associated with a conventional iairless spray gun, generally designated by reference numeral 10.
  • Liquid coating material is supplied through a supply line 11 which connects to an axially extending passage 12 through which a reciprocating valve 13 extends.
  • the reciprocating valve 13 closes upon a valve seat 14 which is formed in the restricted end of a tubular member 15 which forms the terminal portion of the axial fluid passage 12 in the spray gun body 10.
  • the valve 13 is moved away from its seat 14 by a manually actuated trigger 16 and is urged to its normally closed or seated position by a conventional spring or other biasing member (not shown).
  • This structure includes a body assembly 18 which, as best seen in FIGS. 2 and 4, has a tapered tubular member 19 and a transversely extending tip holder guide 20 rigidly secured to the outer end of the tubular member 19.
  • An internally threaded nut 22 having a tapered interior passage shaped to match the outer surface of the tubular member 19 is threaded upon the flange 17 of the spray gun 10 to securely hold the body assembly 18 in place.
  • a seal-ing plunger 23 is coaxially positioned within the tubular member 19.
  • the sealing plunger 23 has a flange 24 which acts with a complementary shoulder 25 on the inner surface of the tubular member 19 to prevent inadvertent removal of the sealing plunger 23.
  • a backup plug 26 is positioned within the tubular member 19 to the rear of the plunger 23, as shown in FIGS. 1, 2, and 4.
  • a retaining ring 27 which is held in an internal groove within the tubular member 19 limits movement of the backup plug 26 to the rear.
  • an O-ring 28 Between the backup plug 26 and the plunger 23 is an O-ring 28 which is circumjacent a restricted portion of the backup plug 26 to prevent leakage of coating material rearwardly past the backup plug 26.
  • An axial liquid passage 29 extends through the plunger 23 and a non-axial liquid passage 30 extends through the backup plug 26 to connect the center portion of the rear surface of the plug 26, as shown in FIG. 2, with the space between the plug 26 and the sealing plunger 23, designated by reference numeral 31.
  • the non-axial passage 30 serves to dissipate a portion of the energyinherent in a flowing liquid stream at the very high pressures involved.
  • the tip holder guide extends generally transversely of the axial passage 12 to form a slot or guide way having a rear surface 32 adjacent the front sealing portion of the sealing plunger 23 and a forward surface formed by return flanges of two sides of the holder guide 20, designated by reference numerals 33 and 34.
  • the orifice slide as seen in elevation in FIG. 5, includes a pair of matching halves, which, when secured together, as by recessed screws 35 and 36, have a rectangular, com plementarily shaped cross section to the ways in the tip holder guide 20.
  • the tip holder slide 37 has one or more internal cavities for positioning a restricted material discharge orifice 38 or 39 therein and has a handle or grip 42 attached to one end.
  • the two slider halves may be separated for removal or inspection of the orifice inserts 38 or 39 by removing the screws 35 and 36.
  • the liquid coating material When the orifice slide 37 is inserted within the tip holder guide 20 in normal spraying position, as shown in FIG. 1, the liquid coating material will flow through an aligned orifice 38 or 39 in a first direction and, when the slide 37 is reversed in the guide 20, as shown in FIG. 2, the liquid coating material will fiow in the opposite direction through an orifice 38 or 39.
  • the slide 37 may be selectively positioned to align one or the other of the orifices 38 and 39 with the axial passage 29 through the plunger 23 so that the operator may selectively use one or the other of the orifices 38 or 39 in the coating operation, as indicated by the dotted and solid line shown in FIG. 1.
  • a spring biased stop member 43 and spaced apart detents 44 on the slider may be provided to initially position the slider 37 and its orifices 38 and 39.
  • the high operating pressure of the liquid coating material is utilized to effectively seal the slide 37 with the adjacent end sealing surface of the plunger 23.
  • an orifice such as 38
  • the tapered nut 22 tightly turned upon the threaded flange 17 so that the end of the tubular member 15 is tightly engaged against the adjacent surface of the backup plug 26
  • liquid under pressure from the passage 30 fills the space 31 between the backup plug 26 and the sealing plunger 23, forcing the sealing plunger 23 forwardly and the backup plug 26 rearwardly.
  • the smaller end of the plunger 23 is urged with high force against the adjacent surface of the slide 37 which is in turn pushed against the forward surfaces 33 and 34 of the tip holder guide 20. Under high operating pressure, an effective seal is formed between the rear surface of the slide 37 and the small end portion of the plunger 23. As long as a high coating pressure is maintained, the slide 37 is rigidly held in its position with its inner surface, adjacent the operating orifice, sealingly engaged with the adjacent surface of the plunger 23. Fluid leakage past the radially outer surface of the plunger 23 and the opposed inner surface of the tubular member 19 can be prevented in any suitable manner as by providing a suitable axially movable seal between the sur faces or by providing a pressure actuated seal including a tapered groove 40, as shown in FIG. 2, which, when under pressure, permits a portion of the plunger 23 to expand and to force the portions external of the groove 40 against the adjacent wall.
  • this high pressure may be released by unscrewing the conical nut 22 a fraction of a turn from the threaded flange 17 so that the adjacent surface of the backup plug 26 is backed away from the tip of the tubular member 15.
  • the volume available to contain fluid within the passages 30 and 29 and the space 31 is enlarged and its pressure is quickly reduced to atmospheric.
  • the valve 13 if it has not yet closed, will quickly seat upon its valve seat 14 and prevent further pressure from being applied to the plunger 23. With the plunger 23 no longer under high pressure, the slide 37 can be easily removed from the guide ways 20 and reversed or otherwise repositioned.
  • a nozzle assembly for a high pressure airless spray gun having a barrel with an axial coating material passage therethrough and a trigger actuated valve controlling said passage, said assembly comprising a body member having a coating material passage and having guiding and retaining ways formed therein transversely to the axis of said coating material passage, means to removably affix said body member to the barrel of said spray gun, a slider member movable in said ways and carrying at least one insert having a restricted orifice therethrough for the discharge of coating material, said slider being completely removable and reversible with respect to said body member, whereby said slider may be removed from said ways, reversed and reinserted into said ways to bring said restricted orifice into re-alignment with said coating material passage in which reversed position the flow of coating material through said orifice is in a reverse direction for cleaning the same.
  • a nozzle assembly in accordance with claim 1 in which said body member has a stepped central bore therethrough, a first coating material directing element in said bore having a passage controlled by said valve, a bored plunger element in said bore axially movable with respect to said body and said first element and having a peripheral hydraulically actuated seal and being adapted to be forced by hydraulic pressure into engagement with said slider whenever said valve is opened to admit coating material to said discharge orifice, the passage in the bore of said plunger element being aligned with the passage forming said discharge orifice in the normal position of said slider.
  • a nozzle assembly in accordance with claim 2 and means to temporarily enlarge the volume of said coating material passages in said body whenever said discharge orifice becomes completely clogged to thereby reduce the fluid pressure tending to urge said slider against its guiding ways.
  • a nozzle assembly in accordance with claim 1 in 5 6 which :said slider member carries a plurality of individ- References Cited ually replaceable spaced inserts each having a restricted UNITED STATES PATENTS discharge orifice therein, which orifices may be selectively brought into juxtaposition with said coating material pas- 442762 12/1890 Wamwnght 239-106 X sage by transverse movement of said slider in said Ways. 5 FOREIGN TENTS 5.

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US607992A 1967-01-09 1967-01-09 Self-cleaning tip for airless spray guns Expired - Lifetime US3414196A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US607992A US3414196A (en) 1967-01-09 1967-01-09 Self-cleaning tip for airless spray guns
DE19671621857 DE1621857A1 (de) 1967-01-09 1967-12-06 Spritzpistole
GB55869/67A GB1141580A (en) 1967-01-09 1967-12-08 Self-cleaning tip for airless spray guns
CH1766567A CH462004A (de) 1967-01-09 1967-12-14 Spritzpistole
FR1550724D FR1550724A (de) 1967-01-09 1968-01-08

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US607992A US3414196A (en) 1967-01-09 1967-01-09 Self-cleaning tip for airless spray guns

Publications (1)

Publication Number Publication Date
US3414196A true US3414196A (en) 1968-12-03

Family

ID=24434587

Family Applications (1)

Application Number Title Priority Date Filing Date
US607992A Expired - Lifetime US3414196A (en) 1967-01-09 1967-01-09 Self-cleaning tip for airless spray guns

Country Status (5)

Country Link
US (1) US3414196A (de)
CH (1) CH462004A (de)
DE (1) DE1621857A1 (de)
FR (1) FR1550724A (de)
GB (1) GB1141580A (de)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3563463A (en) * 1968-12-09 1971-02-16 Richard N Gerold Sprayer nozzle
US3593920A (en) * 1968-05-31 1971-07-20 Delavan Manufacturing Co Spray head
US3696974A (en) * 1969-06-27 1972-10-10 Germaine Van Der Veken Apparatus for transferring a product, liquid or suchlike in a liquid
US3936002A (en) * 1974-11-29 1976-02-03 Geberth John Daniel Jun Adjustable spray tip
US4258885A (en) * 1979-03-23 1981-03-31 Legeza Thomas B Nozzle tip and method of manufacture
WO1982002501A1 (en) * 1981-01-29 1982-08-05 Goesta Hellman A spraying device
US5255848A (en) * 1992-05-01 1993-10-26 Rhodehouse Nolin C Multiple orifice spray device
US6050505A (en) * 1998-12-24 2000-04-18 Ou; Ren-Sheng Spray cover for a spray can
US6502763B1 (en) 2001-01-17 2003-01-07 American Spray Parts Removable multiple orifice spray tip
WO2011112196A1 (en) * 2010-03-11 2011-09-15 Wagner Spray Tech Corporation Multiple spray tip turret assembly for paint sprayer
CN101767070B (zh) * 2010-02-22 2012-08-08 厦门松霖科技有限公司 滑动切换花洒
US20240165639A1 (en) * 2021-03-25 2024-05-23 Robotopia Uab Method for a liquid jet formation and ejection and devices for use in said method

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US442762A (en) * 1890-12-16 Vaporizing spray-nozzle

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US442762A (en) * 1890-12-16 Vaporizing spray-nozzle

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3593920A (en) * 1968-05-31 1971-07-20 Delavan Manufacturing Co Spray head
US3563463A (en) * 1968-12-09 1971-02-16 Richard N Gerold Sprayer nozzle
US3696974A (en) * 1969-06-27 1972-10-10 Germaine Van Der Veken Apparatus for transferring a product, liquid or suchlike in a liquid
US3936002A (en) * 1974-11-29 1976-02-03 Geberth John Daniel Jun Adjustable spray tip
DE2552908A1 (de) * 1974-11-29 1976-08-12 Geberth Jun Einstellbare spritzduese fuer spritzpistole
US4258885A (en) * 1979-03-23 1981-03-31 Legeza Thomas B Nozzle tip and method of manufacture
WO1982002501A1 (en) * 1981-01-29 1982-08-05 Goesta Hellman A spraying device
US5255848A (en) * 1992-05-01 1993-10-26 Rhodehouse Nolin C Multiple orifice spray device
US6050505A (en) * 1998-12-24 2000-04-18 Ou; Ren-Sheng Spray cover for a spray can
US6502763B1 (en) 2001-01-17 2003-01-07 American Spray Parts Removable multiple orifice spray tip
CN101767070B (zh) * 2010-02-22 2012-08-08 厦门松霖科技有限公司 滑动切换花洒
WO2011112196A1 (en) * 2010-03-11 2011-09-15 Wagner Spray Tech Corporation Multiple spray tip turret assembly for paint sprayer
US9079196B2 (en) 2010-03-11 2015-07-14 Wagner Spray Tech Corporation Multiple spray tip turret assembly for paint sprayer
US20240165639A1 (en) * 2021-03-25 2024-05-23 Robotopia Uab Method for a liquid jet formation and ejection and devices for use in said method

Also Published As

Publication number Publication date
CH462004A (de) 1968-08-31
DE1621857A1 (de) 1970-07-30
GB1141580A (en) 1969-01-29
FR1550724A (de) 1968-12-20

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