EP0052682A1 - Reinigungseinrichtung für Mehrkomponenten-Spritzpistole - Google Patents

Reinigungseinrichtung für Mehrkomponenten-Spritzpistole Download PDF

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Publication number
EP0052682A1
EP0052682A1 EP80304222A EP80304222A EP0052682A1 EP 0052682 A1 EP0052682 A1 EP 0052682A1 EP 80304222 A EP80304222 A EP 80304222A EP 80304222 A EP80304222 A EP 80304222A EP 0052682 A1 EP0052682 A1 EP 0052682A1
Authority
EP
European Patent Office
Prior art keywords
purging
gun
rod
opening
mixing chamber
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.)
Granted
Application number
EP80304222A
Other languages
English (en)
French (fr)
Other versions
EP0052682B1 (de
Inventor
David Henderson
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP80304222A priority Critical patent/EP0052682B1/de
Priority to DE8080304222T priority patent/DE3071459D1/de
Publication of EP0052682A1 publication Critical patent/EP0052682A1/de
Application granted granted Critical
Publication of EP0052682B1 publication Critical patent/EP0052682B1/de
Expired 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
    • 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

Definitions

  • This invention relates to guns for mixing and dispensing plural component plastic materials, for example, polyurethane foam, and particularly to an improved device for purging residue from the mixing chamber.
  • the purging device of this invention relates to plural component plastic application equipment or guns of the general i type described and claimed in United States Patent Nos.3,366,337 and 4,133,483 wherein two coreactive streams of chemicals are intimately mixed within the gun and dispensed as a fluent stream or spray.
  • the present invention will be described in connection with plural component foam producing chemicals, but is understood to be generally applicable to mixing guns of the general character irrespective of the particular chemicals used.
  • purging is accomplished through a purging rod operable separate from and independently of the foam mixing and dispensing means of the gun.
  • the purging rod is not utilized to open and close the inlet ports for the chemicals which form the foam.
  • the gun may be used several times without using the purging device.
  • use of solvents to insure complete removal of foam residue is still necessary.
  • a purging device for purging a plural component mixing and dispensing gun comprising a gun body and a head secured to said body, said head having a mixing chamber with a discharge outlet at its forward end, inlet orifices communicating with said chamber, means for intermittently feeding streams of reactant liquids through said orifices into said chamber so that the liquids form a reactive mixture which is discharged through said discharge outlet, said reactive mixture being one which solidifies rapidly after reactive mixtures of said liquids and said head including an opening axially aligned with said chamber disposed rearwardly thereof, the purging device being selectively operable to purge said mixing chamber of residual reactant mixture and including means to insert a separate scraping member into said opening at an angle to the axis of the opening and a purging rod received in said opening, said scraping member being positioned between the end of said purging rod and said inlet orifices to effectively seal the purging rod from contact with liquid introduced into said mixing chamber, said rod being selectively movable from a first
  • the present invention overcomes the difficulties and drawbacks of prior art plural component dispensing guns by eliminating the need to use a solvent bath or solution. Elimination of the bath lowers the cost of operation and provides an added safety measure as a source of combustible material and noxious-f-umes, e.g. solvent, is not required.
  • the purging device utilizes a compressible sphere of a plastic material which is forced by air under pressure to seat in a position rearwardly of the foam component inlet orifices and mixing chamber.
  • a movable rod positioned rearwardly of the seated spherical ball is selectively actuable independently of the foam mixing and dispensing operation to force the ball through the mixing chamber thereby to scrape the walls of the chamber to remove foam residue without requiring a separate solvent bath.
  • a dual component dispensing gun 10 is shown having a gun head 12, modified in accordance with the present invention, secured thereto.
  • the liquid chemical reactant components are supplied through inlet orifices 14 and 16 to chambers 18 and 20.
  • the chambers 18 and 20 communicate with opposed cross- bores or ducts 22 and 24 and the flow of each liquid chemical is controlled by valve means, fragmentarily indicated by reference numeral 26.
  • valves 26 are normally closed but are opened substantially simultaneously when dispensing is desired by movement of a gun trigger 28 by the operator of the device.
  • valves 26 When valves 26 are opened, the chemical reactants flow into ducts 22-24 and through impingement orifices 30 and 32 into a cylindrically shaped mixing chamber 34 where they are thoroughly mixed. The mixture then being ejected from a discharge outlet 36 formed in cylindrical extension 38 at the exit end of the mixing chamber 34.
  • the rearward end of the gun head 12 is provided with a bore 40 axially aligned with mixing chamber 34, the bore being threaded for a portion of its length to receive the threaded portion 42 of a sleeve 44, the main body of which is snuggly and sealingly received in the bore 40.
  • the sleeve 44 is preferably formed of Teflon or other low friction material.
  • a bore 46 is provided in gun head 12 to intersect the bore 40 at a point spaced rearwardly from the location of the impingement orifices 30 and 32. Bore 46 is threaded, as at 48, to threadably receive one end 50 of a tube 52.
  • Tube 52 is preferably a flexible plastic material having its other end 54 connected to a container 56 holding a supply of compressible plastic spheres 58. Air under pressure supplied from a pressure source 60 passes through container 56 to direct spheres 58 through tube 52.
  • Each sphere 58 has a diameter slightly larger than the diameter of mixing chamber 34 and under pressure from air source 60 one sphere enters bore 40 and is seated in a spherical depression 62 formed on the surface of bore 40 opposite bore 46.
  • the sphere so seated has its lowermost segment, as viewed in Fig. 1, disposed within the opening 64 formed by the inter-section of bore 46 and bore 40 to preclude further movement of spheres 58 into the chamber and to seal the opening as well to preclude any flow of air from pressure source 60 into the gun.
  • the sleeve 44 is provided with an axial bore 66 in which a purging rod 68 is slidingly and sealingly received.
  • Purging rod 68 is coaxial with and preferably of a smaller diameter than the bore 40 so that the rod does not scrape on the inner wall of the chamber.
  • the end 70 of purging rod 68 in its retracted position, as shown in the drawings, is positioned rearwardly of the inlet orifices 28 and 30 and rearwardly of a sphere 58 seated in bore 40.
  • rod 68 and a sphere 58 are utilized only for purging the mixing chamber and outlet and has nothing whatsoever to do with the starting and stopping of the mixing or dispensing operations.
  • the gun may be operated several consecutive times without using the purging rod and, conversely, the purging rod may be moved through any number of consecutive purging strokes without utilizing the mixing or dispensing mechanisms. This is extremely advantageous because it is at times difficult to adequately purge the mixing chamber and outlet nozzle of the gun with a single stroke.
  • the purging rod in the preferred embodiment, is operated by a double acting air cylinder, designated generally in Fig. 1 by the numeral 72.
  • the cylinder body 74 has a forward portion 76 which is removably fitted within an opening 78 in the rearward surface of the gun body 10 coaxial with the mixing chamber 34.
  • a piston 80 which is secured to the purging rod for movement therewith, divides the cylinder bore into an advance chamber 82 and return chamber 84.
  • Piston 80 is provided with an axial bore 86 in which i is slidably received a valving rod 88 having its rearward end projecting outwardly of the cylinder body and provided with a push button 90.
  • a spring 92 biases the valving rod to an outward or retracted position.
  • Air under pressure is fed from a suitable source into inlet opening 94, through axial port 96 in rod 88, the forward portion of bore 86, and into return chamber 84, thereby normally holding all of the cylinder elements and the purging rod 68 in a retracted position as shown in the drawings.
  • push button 90 When it is desired to purge the gun of residual foam material, push button 90 is depressed to extend purging rod 68. End 70 of purging rod 68 contacts the sphere 58 seated in bore 40 and the force of rod 68 pushes the sphere into bore 40 compressing it slightly. Sphere 58 completely fills bore 40 and as rod 68 continues to extend the sphere moves down the bore scraping any residual foam material and pushing it along ahead of the sphere. The stroke of piston 80 is sufficiently long to drive the purging rod 68 through the mixing chamber 34 to expel the sphere 58 out the discharge outlet 36.
  • purging rod 68 is disposed above the sphere inlet opening 64 precluding entry of the next sphere into bore 40.
  • air pressure from source 60 forces the next sphere into bore 40 where it seals opening 42 as noted above.
  • the purging rod may be selectively utilized for any desired number of purging strokes completely independently of any foam mixing or operations. This is critical to adequate and complete purging because it is virtually impossible -to perform adequate purging with a single stroke of a rod without the messy, hazardous use of cleaning fluids. Such cleaning fluids are entirely eliminated with this invention.
  • the purging rod and its actuating air cylinder are readily removable by hand from the gun for maintenance by simply unscrewing or sliding the air cylinder out of the gun body and retracting the purging rod rearwardly through the head and body of the gun.
  • the push button control may comprise a remote control switch mounted on the gun body below the two way cylinder and therefore be considered even more conveniently accessible to the operator of the device.

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  • Nozzles (AREA)
EP80304222A 1980-11-25 1980-11-25 Reinigungseinrichtung für Mehrkomponenten-Spritzpistole Expired EP0052682B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP80304222A EP0052682B1 (de) 1980-11-25 1980-11-25 Reinigungseinrichtung für Mehrkomponenten-Spritzpistole
DE8080304222T DE3071459D1 (en) 1980-11-25 1980-11-25 A device for purging a plural component mixing and dispensing gun and a gun incorporating it

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP80304222A EP0052682B1 (de) 1980-11-25 1980-11-25 Reinigungseinrichtung für Mehrkomponenten-Spritzpistole

Publications (2)

Publication Number Publication Date
EP0052682A1 true EP0052682A1 (de) 1982-06-02
EP0052682B1 EP0052682B1 (de) 1986-02-26

Family

ID=8187311

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80304222A Expired EP0052682B1 (de) 1980-11-25 1980-11-25 Reinigungseinrichtung für Mehrkomponenten-Spritzpistole

Country Status (2)

Country Link
EP (1) EP0052682B1 (de)
DE (1) DE3071459D1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4223054A1 (de) * 1992-07-14 1994-01-20 Gema Volstatic Ag St Gallen Verfahren und Vorrichtung zum Reinigen von Pulverleitungen
DE112006000863B4 (de) * 2005-04-13 2009-08-27 Illinois Tool Works Inc., Glenview Shuttle-Schub-System für Beschichtungsmaterial-Auftragsvorrichtungen
WO2011071527A3 (en) * 2009-12-08 2011-10-20 Graco Minnesota Inc. Tool-less quick-change valving rod

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2884203A (en) * 1957-04-08 1959-04-28 Frances J Broughton Spray shower assembly
US4133483A (en) * 1977-07-05 1979-01-09 Binks Manufacturing Company Plural component gun

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3030666A (en) * 1960-01-07 1962-04-24 Owens Illinois Glass Co Method for low pressure molding

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2884203A (en) * 1957-04-08 1959-04-28 Frances J Broughton Spray shower assembly
US4133483A (en) * 1977-07-05 1979-01-09 Binks Manufacturing Company Plural component gun

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4223054A1 (de) * 1992-07-14 1994-01-20 Gema Volstatic Ag St Gallen Verfahren und Vorrichtung zum Reinigen von Pulverleitungen
DE112006000863B4 (de) * 2005-04-13 2009-08-27 Illinois Tool Works Inc., Glenview Shuttle-Schub-System für Beschichtungsmaterial-Auftragsvorrichtungen
WO2011071527A3 (en) * 2009-12-08 2011-10-20 Graco Minnesota Inc. Tool-less quick-change valving rod
CN102648057A (zh) * 2009-12-08 2012-08-22 格瑞克明尼苏达有限公司 没有工具的快速更替的阀杆

Also Published As

Publication number Publication date
DE3071459D1 (en) 1986-04-03
EP0052682B1 (de) 1986-02-26

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