USRE46291E1 - Plural component spray gun for fast setting materials - Google Patents

Plural component spray gun for fast setting materials Download PDF

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Publication number
USRE46291E1
USRE46291E1 US14/662,864 US200314662864A USRE46291E US RE46291 E1 USRE46291 E1 US RE46291E1 US 200314662864 A US200314662864 A US 200314662864A US RE46291 E USRE46291 E US RE46291E
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United States
Prior art keywords
spray gun
seal
plural component
component materials
fast setting
Prior art date
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Expired - Lifetime
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US14/662,864
Inventor
Douglas P. Zittel
Michael J. Sebion
Richard D. Anderson
Peter L. Linder
Christopher J. Pellin
Mark T. Weinberger
Mark C. Richter
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Graco Minnesota Inc
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Graco Minnesota Inc
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/20—Jet mixers, i.e. mixers using high-speed fluid streams
    • B01F25/23—Mixing by intersecting jets
    • 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
    • B05B1/28—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with integral means for shielding the discharged liquid or other fluent material, e.g. to limit area of spray; with integral means for catching drips or collecting surplus liquid or other fluent material
    • B01F5/0256—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D7/00—Sublimation
    • B01D7/02—Crystallisation directly from the vapour phase
    • B01F13/002—
    • B01F13/0027—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/50—Movable or transportable mixing devices or plants
    • B01F33/501—Movable mixing devices, i.e. readily shifted or displaced from one place to another, e.g. portable during use
    • B01F33/5011—Movable mixing devices, i.e. readily shifted or displaced from one place to another, e.g. portable during use portable during use, e.g. hand-held
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/50—Movable or transportable mixing devices or plants
    • B01F33/501—Movable mixing devices, i.e. readily shifted or displaced from one place to another, e.g. portable during use
    • B01F33/5011—Movable mixing devices, i.e. readily shifted or displaced from one place to another, e.g. portable during use portable during use, e.g. hand-held
    • B01F33/50114—Movable mixing devices, i.e. readily shifted or displaced from one place to another, e.g. portable during use portable during use, e.g. hand-held of the hand-held gun type
    • B05B15/025—
    • 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
    • B05B15/55—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
    • B05B7/0408—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing two or more liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/12—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages
    • B05B7/1254—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages the controlling means being fluid actuated
    • B05B7/1263—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages the controlling means being fluid actuated pneumatically actuated
    • B05B7/1272—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages the controlling means being fluid actuated pneumatically actuated actuated by gas involved in spraying, i.e. exiting the nozzle, e.g. as a spraying or jet shaping gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
    • B29B7/7404—Mixing devices specially adapted for foamable substances
    • B29B7/7409—Mixing devices specially adapted for foamable substances with supply of gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
    • B29B7/7404—Mixing devices specially adapted for foamable substances
    • B29B7/7409—Mixing devices specially adapted for foamable substances with supply of gas
    • B29B7/7428—Methodical aspects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
    • B29B7/7438—Mixing guns, i.e. hand-held mixing units having dispensing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
    • B29B7/76—Mixers with stream-impingement mixing head
    • B29B7/761—Mixers with stream-impingement mixing head of gun-type, i.e. hand-held units having dispensing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
    • B29B7/76—Mixers with stream-impingement mixing head
    • B29B7/7631—Parts; Accessories
    • B29B7/7652—Construction of the discharge orifice, opening or nozzle
    • B29B7/7657—Adjustable discharge orifices, openings or nozzle openings, e.g. for controlling the rate of dispensing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/80—Component parts, details or accessories; Auxiliary operations
    • B29B7/802—Constructions or methods for cleaning the mixing or kneading device
    • B29B7/803—Cleaning of mixers of the gun type, stream-impigement type, mixing heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/08—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point
    • B05B7/0807—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets
    • B05B7/0815—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets with at least one gas jet intersecting a jet constituted by a liquid or a mixture containing a liquid for controlling the shape of the latter

Definitions

  • Plural component spray guns for use with fast setting materials have been popular for applying foams and similar materials. While such application devices are generally effective in applying such materials, they are often cumbersome and can require a number of tools and substantial effort to disassemble and clean.
  • a plural component spray gun is designed for spraying quick setting materials such as foams and the like.
  • the air purge version of the gun is designed so as to be easily serviceable with a minimum of tools.
  • the side seal cartridges may be installed and removed without tools by removing the retaining ring and then extracting them from the fluid housing using a coin or screwdriver. The cartridges are easily disassembled and cleaned.
  • the fluid housing may be removed from the handle by unscrewing the lock ring (by hand).
  • Grease may be directly injected into the gun for storage without disassembly and is spread though the mix chamber by the purge air.
  • the mixing chamber and piston are easily separated using an 1 ⁇ 8 turn connection. Line of sight air passages in the body are easy to machine and allow easier service in the field if plugged.
  • Impingement hole cleaning may be accomplished without exposing the fluid to air.
  • the sealing surfaces of the side seal cartridge assemblies and the corresponding surfaces of the mix chamber are made of a hardened metal material such 440C stainless steel providing a metal-to-metal seal yielding excellent durability.
  • the air cap is provided with a pair of horns spaced so as to correspond with the dimension of the flats on the impingement chamber retainer to allow the retainer to be removed and installed without the use of a separate tool.
  • Typical prior art mechanical purge guns have two sets of fluid seals to seal the valving rod.
  • the main seal usually an interference fit, is Delrin A-F and is not adjustable.
  • the front seal is also an interference fit and made from UHMWPE and also not adjustable. When the main seal wears the gun will “spit” fluid out the front of the gun, plugging the tip. The seals typically wear at similar rates, so when the gun spits, the users replaces both seals.
  • the impingement chamber forms first and second spaced annular chambers about the periphery thereof and first and second sets of passages connect said chambers with the interior passage thereof.
  • the first and second sets of passages enter the interior passage at the same axial location thereby preventing a lead-lag situation which can produce unmixed material.
  • An easily adjustment mechanism for the purge rod is provided.
  • the simple adjustment may be accomplished by turning the purge rod at the rear of the gun using a nut driver or similar tool.
  • the purge rod is threadedly engaged in the piston while the piston is prevented from rotating relative to the gun body by means of complementary flats in the bore and on the piston.
  • FIG. 1 is a perspective view of air purge embodiment of the instant invention.
  • FIG. 2 is a partially cutaway view of the instant invention from the same angle as FIG. 1 .
  • FIG. 3 shows a partially exploded view of the front of the instant invention.
  • FIG. 4 shows an exploded view of the side seal cartridge of the instant invention.
  • FIG. 5 shows assembly of the mix chamber to the fluid housing.
  • FIG. 6 shows removal of the fluid housing from the gun body.
  • FIG. 7 shows an exploded view of the instant invention.
  • FIG. 8 shows a cross section of a mechanical purge embodiment of the instant invention.
  • FIG. 9 shows a front perspective view of the mechanical purge embodiment of FIG. 8 showing the air cap reversed for impingement chamber retainer removal.
  • FIG. 10 is a front view of the impingement chamber of the mechanical purge embodiment of FIG. 8 .
  • FIG. 11 is a section view taken along line 11 - 11 of FIG. 10 .
  • FIG. 12 is a section view taken along line 12 - 12 of FIG. 10 .
  • FIG. 13 is a partially exploded perspective view of the packing arrangement.
  • FIG. 14 is a partially exploded side view of the packing arrangement.
  • FIG. 15 is a partially exploded perspective view of the safety arrangement.
  • FIG. 16 is a partially exploded side view of the safety arrangement.
  • FIG. 17 is a partially cutaway view of the mechanical purge embodiment of FIG. 8 .
  • the air purge spray gun of the instant invention is shown in whole in FIGS. 1, 2 and 7 .
  • Gun 100 is comprised of a gun body 1 .
  • air passages 1 a are all manufactured in the line of sight for ease of machining and maintenance. When the piston 15 is removed, the whole length of each of the passages may be viewed and easily cleaned using a drill bit.
  • a releasable piston stop 28 is provided and may be actuated (via a push and turn) using safety lock 4 .
  • O-ring 24 and spring 30 are located therebetween.
  • a rear cylinder cap 5 threads onto the rear of gun body 1 and is sealed by o-ring 14 .
  • One piece piston 15 slides on the interior 1 c of gun body 1 (which have complementary flats 15 a and 1 b to prevent relative rotation) and has a projecting shaft 15 a Sealing o-rings 16 and 17 are provided.
  • Mixing chamber 19 has two impingement holes 19 a located diametrically opposite one another. Mixing chamber 19 also has two flattened sides 19b which maintain the angular orientation relative to the fluid housing 11 . Mixing chamber 19 also has a connecting flange 19 c at the rear end thereof for 1 ⁇ 8 turn push and turn engagement (similar to a bayonet joint) with piston projecting shaft 15 a. Side seal cartridge assemblies 18 and 20 are engaged and retained in fluid housing 11 by a combination of the friction fit of o-rings 19d and 20 d and radial retention by retaining ring 9 .
  • Retaining ring 9 also retains air cap 10 which screws to the front of mix chamber 19 .
  • Lock ring 7 is retained to the rear end of fluid housing 11 by ring 27 . Sealing is provided by seals 10 a, 23 and 21 .
  • This fluid chamber attachment arrangement allows the fluid section to be removed from the body without exposing either of the resin or iso (isocyanate) fluids to atmosphere which would lead to crystallization of the iso.
  • Side seal cartridge assemblies 18 and 20 are comprised of cartridge housings 18 a and 20 a, springs 18 b and 20 b, seals 18 c and 20 c and o-rings 18 d, 20 d, 18 e and 20 e.
  • the sealing surfaces of side seal cartridge assemblies 18 and 20 e.g. seal surface 20f
  • the corresponding surfaces 19b of mix chamber 19 are made of a hardened metal material such 440C stainless steel.
  • Fluid manifold assembly 12 is comprised of a manifold housing 12 a, first and second fluid valves 12 b, plugs 12 c, bolt 12 d and swivels 12 e and 12 f.
  • First and second fluid valves 12 b each are provided with a one piece stem 12 h having a hex head with a seal 12 i threaded onto the other end for releasably shutting off fluid flow of the material being controlled.
  • Fluid manifold 12 attaches to fluid housing 11 via bolt 12 d and sealing o-ring 12 g.
  • each check valve 26 being comprised of a housing 26 a, a screw 26 b, a carbide ball 26 c, a screen 26 d, a spring 26 e and o-rings 26 f and 26 g. Note that fluid flows from the inside out through the screen so that fluid pressure cannot collapse the screen 26 d as happens on prior art guns.
  • Trigger 13 is mounted to body 1 by pin 6 and screw 29 .
  • the rear of trigger 13 selectively (by operator operation) contacts spool type air valve 32 in body 1 .
  • Spool type air valve 32 is mounted with 3 o-rings 24 , spring 31 and air valve plug 2 which is in turn backed by an air quick disconnect 35 .
  • O-rings 24 like all o-rings in the gun are solvent-resistant so that the whole gun (not just the fluid section) can be soaked in solvent for cleaning.
  • a muffler 22 and plug 33 are also provided in the bottom of gun body 1 . Air valve disconnect 35 and plug 33 may be exchanged in order to have air come in from the back or bottom as desired by the operator.
  • a grease zerk fitting 25 is supplied in the fluid housing and connects to the purge air passage 8 a, which is fluidly coupled to purge air passage 8b in gun body 1. This allows the fluid passages in the mix chamber 19 and the front end of the gun to be filled with grease (which mixes with the purge air to prevent setup and crystallization. Such injection will allow the spray gun to be stored overnight with having to be completely cleaned. Similarly, the air cap 10 serves to direct cleanoff air around the front of the tip 19 a 19d so as to prevent buildup thereon.
  • the air cap 110 is provided with a pair of horns 110 A spaced so as to correspond with the dimension of the flats 142 A on the impingement chamber retainer 142 to allow the retainer 142 to be removed and installed without the use of a separate tool.
  • the impingement chamber 144 forms first and second spaced annular chambers 146 A and 146 B about the periphery thereof and first and second sets of passages 144 A and 144 B respectively connect said annular chambers 146 A and 146 B with the interior passage 144 C thereof.
  • the first and second sets of passages 144 A and 144 B enter the interior passage 144 C at the same axial location thereby preventing a lead-lag situation which can produce unmixed material.
  • set 144 A is axially angled and set 144 B radial and normal to the axis to achieve this result.
  • An easily adjustment mechanism for the purge rod 148 is provided.
  • the simple adjustment may be accomplished by turning the rear end 148 A purge rod at the rear of the gun using a nut driver or similar tool.
  • the one piece purge rod 148 is threadedly engaged in the piston 115 while the piston is 115 prevented from rotating relative to the gun body 101 by means of complementary flats in the bore and on the piston ( 101 A and 115 A respectively).
  • the adjustable packing 154 of the instant invention held in place by the tip retainer 150 (which also retains tip 152 ), allows the user to snug-up the front seal to stop the spitting. This adjustability will allow users to at least finish out the day without changing the main packing.
  • the safety 158 must operate easily under all conditions.
  • the guns are often covered with overspray from foam or polyurea, making safety actuation difficult.
  • the safety sleeve 156 made of polyethylene, ensures the safety 158 will be free moving even when covered in overspray and is shown in FIGS. 15 and 16 . Foam or polyurea will not stick to polyethylene. If there is a build-up on the safety actuator 160 , the polyethylene will shed the over-spray when the safety 158 is actuated.

Abstract

A plural component spray gun (1) is designed for spraying quick setting materials such as foams, polyurea and the like. Towards this end, the gun (1) is designed so as to be easily serviceable with a minimum of tools. For example, the side seal cartridges (18) and (20) may be installed and removed without tools by removing the retaining ring (9) and then extracting them from the fluid housing (11). Those cartridges (18) and (20) are easily disassembled and cleaned. Similarly, the fluid housing (11) may be removed from the handle/body (1) by unscrewing the lock ring (7) by hand.

Description

TECHNICAL FIELD
This application claims the benefit of U.S. application Ser. Nos. 60/420,085, filed Oct. 22, 2002, 60/441,575 filed Jan. 21, 2003 and 60/462,124 filed Apr. 10, 2003.More than one reissue application has been filed for the reissue of U.S. Pat. No. 7,694,893. This application and application Ser. No. 14/662,846 are reissue divisional applications of application Ser. No. 13/446,222, which is an application for reissue of U.S. Pat. No. 7,694,893. Application Ser. No. 13/446,222 has been reissued as U.S. Pat. No. Re. 46,002. This application claims the benefit of U.S. application Ser. Nos. 60/420,085, filed Oct. 22, 2002, 60/441,575 filed Jan. 21, 2003 and 60/462,124 filed Apr. 10, 2003.
BACKGROUND ART
Plural component spray guns for use with fast setting materials have been popular for applying foams and similar materials. While such application devices are generally effective in applying such materials, they are often cumbersome and can require a number of tools and substantial effort to disassemble and clean.
DISCLOSURE OF THE INVENTION
A plural component spray gun is designed for spraying quick setting materials such as foams and the like. Towards this end, the air purge version of the gun is designed so as to be easily serviceable with a minimum of tools. For example, the side seal cartridges may be installed and removed without tools by removing the retaining ring and then extracting them from the fluid housing using a coin or screwdriver. The cartridges are easily disassembled and cleaned.
Similarly, the fluid housing may be removed from the handle by unscrewing the lock ring (by hand). Grease may be directly injected into the gun for storage without disassembly and is spread though the mix chamber by the purge air. The mixing chamber and piston are easily separated using an ⅛ turn connection. Line of sight air passages in the body are easy to machine and allow easier service in the field if plugged.
Impingement hole cleaning may be accomplished without exposing the fluid to air. The sealing surfaces of the side seal cartridge assemblies and the corresponding surfaces of the mix chamber are made of a hardened metal material such 440C stainless steel providing a metal-to-metal seal yielding excellent durability.
In a mechanical purge version of the gun, The air cap is provided with a pair of horns spaced so as to correspond with the dimension of the flats on the impingement chamber retainer to allow the retainer to be removed and installed without the use of a separate tool.
Typical prior art mechanical purge guns have two sets of fluid seals to seal the valving rod. The main seal, usually an interference fit, is Delrin A-F and is not adjustable. The front seal is also an interference fit and made from UHMWPE and also not adjustable. When the main seal wears the gun will “spit” fluid out the front of the gun, plugging the tip. The seals typically wear at similar rates, so when the gun spits, the users replaces both seals.
The impingement chamber forms first and second spaced annular chambers about the periphery thereof and first and second sets of passages connect said chambers with the interior passage thereof. The first and second sets of passages enter the interior passage at the same axial location thereby preventing a lead-lag situation which can produce unmixed material.
An easily adjustment mechanism for the purge rod is provided. The simple adjustment may be accomplished by turning the purge rod at the rear of the gun using a nut driver or similar tool. The purge rod is threadedly engaged in the piston while the piston is prevented from rotating relative to the gun body by means of complementary flats in the bore and on the piston.
These and other objects and advantages of the invention will appear more fully from the following description made in conjunction with the accompanying drawings wherein like reference characters refer to the same or similar parts throughout the several views.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a perspective view of air purge embodiment of the instant invention.
FIG. 2 is a partially cutaway view of the instant invention from the same angle as FIG. 1.
FIG. 3 shows a partially exploded view of the front of the instant invention.
FIG. 4 shows an exploded view of the side seal cartridge of the instant invention.
FIG. 5 shows assembly of the mix chamber to the fluid housing.
FIG. 6 shows removal of the fluid housing from the gun body.
FIG. 7 shows an exploded view of the instant invention.
FIG. 8 shows a cross section of a mechanical purge embodiment of the instant invention.
FIG. 9 shows a front perspective view of the mechanical purge embodiment of FIG. 8 showing the air cap reversed for impingement chamber retainer removal.
FIG. 10 is a front view of the impingement chamber of the mechanical purge embodiment of FIG. 8.
FIG. 11 is a section view taken along line 11-11 of FIG. 10.
FIG. 12 is a section view taken along line 12-12 of FIG. 10.
FIG. 13 is a partially exploded perspective view of the packing arrangement.
FIG. 14 is a partially exploded side view of the packing arrangement.
FIG. 15 is a partially exploded perspective view of the safety arrangement.
FIG. 16 is a partially exploded side view of the safety arrangement.
FIG. 17 is a partially cutaway view of the mechanical purge embodiment of FIG. 8.
 BEST MODE FOR CARRYING OUT THE INVENTION
The air purge spray gun of the instant invention, generally designated 100, is shown in whole in FIGS. 1, 2 and 7. Gun 100 is comprised of a gun body 1. As can be seen in FIG. 2, air passages 1a are all manufactured in the line of sight for ease of machining and maintenance. When the piston 15 is removed, the whole length of each of the passages may be viewed and easily cleaned using a drill bit.
A releasable piston stop 28 is provided and may be actuated (via a push and turn) using safety lock 4. O-ring 24 and spring 30 are located therebetween. A rear cylinder cap 5 threads onto the rear of gun body 1 and is sealed by o-ring 14. One piece piston 15 slides on the interior 1c of gun body 1 (which have complementary flats 15a and 1b to prevent relative rotation) and has a projecting shaft 15a Sealing o- rings 16 and 17 are provided.
Mixing chamber 19 has two impingement holes 19a located diametrically opposite one another. Mixing chamber 19 also has two flattened sides 19b which maintain the angular orientation relative to the fluid housing 11. Mixing chamber 19 also has a connecting flange 19c at the rear end thereof for ⅛ turn push and turn engagement (similar to a bayonet joint) with piston projecting shaft 15a. Side seal cartridge assemblies 18 and 20 are engaged and retained in fluid housing 11 by a combination of the friction fit of o- rings 19d and 20d and radial retention by retaining ring 9.
Retaining ring 9 also retains air cap 10 which screws to the front of mix chamber 19. Lock ring 7 is retained to the rear end of fluid housing 11 by ring 27. Sealing is provided by seals 10a, 23 and 21. This fluid chamber attachment arrangement allows the fluid section to be removed from the body without exposing either of the resin or iso (isocyanate) fluids to atmosphere which would lead to crystallization of the iso.
Side seal cartridge assemblies 18 and 20 are comprised of cartridge housings 18a and 20a, springs 18b and 20b, seals 18c and 20c and o- rings 18d, 20d, 18e and 20e. The sealing surfaces of side seal cartridge assemblies 18 and 20 (e.g. seal surface 20f) and the corresponding surfaces 19b of mix chamber 19 are made of a hardened metal material such 440C stainless steel.
Fluid manifold assembly 12 is comprised of a manifold housing 12a, first and second fluid valves 12b, plugs 12c, bolt 12d and swivels 12e and 12f. First and second fluid valves 12b each are provided with a one piece stem 12h having a hex head with a seal 12i threaded onto the other end for releasably shutting off fluid flow of the material being controlled. Fluid manifold 12 attaches to fluid housing 11 via bolt 12d and sealing o-ring 12g.
Located on the two sides of fluid housing 11 are check valves 26, each check valve 26 being comprised of a housing 26a, a screw 26b, a carbide ball 26c, a screen 26d, a spring 26e and o-rings 26f and 26g. Note that fluid flows from the inside out through the screen so that fluid pressure cannot collapse the screen 26d as happens on prior art guns.
Trigger 13 is mounted to body 1 by pin 6 and screw 29. The rear of trigger 13 selectively (by operator operation) contacts spool type air valve 32 in body 1. Spool type air valve 32 is mounted with 3 o-rings 24, spring 31 and air valve plug 2 which is in turn backed by an air quick disconnect 35. O-rings 24 like all o-rings in the gun are solvent-resistant so that the whole gun (not just the fluid section) can be soaked in solvent for cleaning. A muffler 22 and plug 33 are also provided in the bottom of gun body 1. Air valve disconnect 35 and plug 33 may be exchanged in order to have air come in from the back or bottom as desired by the operator.
A grease zerk fitting 25 is supplied in the fluid housing and connects to the purge air passage 8a, which is fluidly coupled to purge air passage 8b in gun body 1. This allows the fluid passages in the mix chamber 19 and the front end of the gun to be filled with grease (which mixes with the purge air to prevent setup and crystallization. Such injection will allow the spray gun to be stored overnight with having to be completely cleaned. Similarly, the air cap 10 serves to direct cleanoff air around the front of the tip 19a 19d so as to prevent buildup thereon.
In a mechanical purge version of the gun 40, The air cap 110 is provided with a pair of horns 110A spaced so as to correspond with the dimension of the flats 142A on the impingement chamber retainer 142 to allow the retainer 142 to be removed and installed without the use of a separate tool.
The impingement chamber 144 forms first and second spaced annular chambers 146A and 146B about the periphery thereof and first and second sets of passages 144A and 144B respectively connect said annular chambers 146A and 146B with the interior passage 144C thereof. The first and second sets of passages 144A and 144B enter the interior passage 144C at the same axial location thereby preventing a lead-lag situation which can produce unmixed material. As can be seen, set 144A is axially angled and set 144B radial and normal to the axis to achieve this result.
An easily adjustment mechanism for the purge rod 148 is provided. The simple adjustment may be accomplished by turning the rear end 148A purge rod at the rear of the gun using a nut driver or similar tool. The one piece purge rod 148 is threadedly engaged in the piston 115 while the piston is 115 prevented from rotating relative to the gun body 101 by means of complementary flats in the bore and on the piston (101A and 115A respectively).
The adjustable packing 154 of the instant invention, held in place by the tip retainer 150 (which also retains tip 152), allows the user to snug-up the front seal to stop the spitting. This adjustability will allow users to at least finish out the day without changing the main packing.
Mechanical Purge gun operators often must actuate the gun safety, when adjusting air flow or changing tips. The safety 158 must operate easily under all conditions. The guns are often covered with overspray from foam or polyurea, making safety actuation difficult. The safety sleeve 156, made of polyethylene, ensures the safety 158 will be free moving even when covered in overspray and is shown in FIGS. 15 and 16. Foam or polyurea will not stick to polyethylene. If there is a build-up on the safety actuator 160, the polyethylene will shed the over-spray when the safety 158 is actuated.
It is contemplated that various changes and modifications may be made to the spray gun without departing from the spirit and scope of the invention as defined by the following claims.

Claims (42)

The invention claimed is:
1. A spray gun for fast setting plural component materials, said spray gun comprising:
a gun body;
an air cap;
a retaining ring;
a fluid housing removably attached to said gun body, said fluid housing having a threaded surface for threadedly receiving said retaining ring and generally opposed first and second radial ports in said threaded surface; and
first and second seal cartridges retained in said ports by friction and said retaining ring.
2. The spray gun of claim 1 wherein said air valve engages said gun body with no more than three seals.
3. The spray gun of claim 1 wherein said air valve is connected to a muffler in said gun body.
4. The spray gun of claim 1 further comprising a fluid manifold removably fastened to said fluid housing, said fluid manifold being sealed thereto by an o-ring.
5. The spray gun of claim 1 further comprising a fluid manifold, said fluid manifold comprising a body and first and second fluid valves for connection to first and second components of a plural component material, each of said first and second valves comprising
a one piece stem having a head thereon to allow manipulation to open or closed positions; and
a seal for sealingly engaging said manifold body.
6. The spray gun of claim 1 further comprising:
a mix chamber located in said fluid housing;
a purge air passage located in said fluid housing;
a zerk fitting in said fluid housing and connected to said purge air passage for receiving protective material.
7. The spray gun for fast setting plural component
materials of claim 1 further comprising a fluid housing having a mix chamber located therein and said first and second seal cartridges sealing against said mix chamber, said cartridges and said mix chamber comprising sealing surfaces comprised of a hardened material.
8. The spray gun for fast setting plural component materials of claim 7 wherein said mix chamber is formed from a hardened material.
9. The spray gun for fast setting plural component materials of claim 8 wherein said hardened material is 440C stainless steel.
10. The spray gun for fast setting plural component materials of claim 1 further comprising a grease fitting in said fluid housing for injection of grease into said spray gun for storage.
11. A spray gun for fast setting plural component materials, said spray gun comprising:
a gun body;
an air cap;
a fluid housing attached to said gun housing and receiving said air cap and generally a mix chamber located in said fluid housing;
a purge air passage located in said fluid housing; and
a zerk fitting in said fluid housing and connected to said purge air passage for receiving protective material.
12. A spray gun for fast setting plural component materials, said spray gun comprising:
a gun body;
an air cap; and
a fluid housing attached to said gun body, said fluid housing comprising:
a mix chamber located in said fluid housing;
a purge air passage extending through said fluid housing from said gun body;
a fitting connected to said purge air passage for receiving protective material; and
first and second seal cartridges retained in said fluid housing;
wherein said fluid housing receives said air cap and wherein said first and second seal cartridges and said mix chamber comprise sealing surfaces comprised of a hardened material.
13. The spray gun for fast setting plural component materials of claim 31 wherein:
the fitting connected to said purge air passage for receiving protective material comprises a zerk fitting located in said fluid housing.
14. The spray gun for fast setting plural component materials of claim 31 further comprising:
a fastener for retaining said first and second seal cartridges in the fluid housing.
15. The spray gun for fast setting plural component materials of claim 34 wherein:
the fastener comprises a retaining ring.
16. The spray gun for fast setting plural component materials of claim 31 wherein the first and second seal cartridges each comprise:
a cartridge housing having one or more solvent resistant o-rings located on an outer surface;
a seal having a cartridge seal surface and being located within the cartridge housing so that a spring biases the cartridge seal surface against the mix chamber; and
a spring disposed between the cartridge housing and the seal.
17. A spray gun for fast setting plural component materials, said spray gun comprising:
a gun body;
a piston located within the gun body configured to receive a connecting flange of a mix chamber and movable between a first position and a second position;
an air cap; and
a fluid housing attached to said gun body, said fluid housing comprising:
a mix chamber located in said fluid housing and connected to the piston by a connecting flange so that movement of the piston causes movement of the mix chamber;
a purge air passage extending through said fluid housing from said gun body; and
first and second seal cartridges retained in said fluid housing;
wherein said first and second seal cartridges and said mix chamber comprise sealing surfaces comprised of a hardened material.
18. The spray gun for fast setting plural component materials of claim 17 further comprising:
an air valve located within the gun body and connected to a trigger; and
a trigger located outside the gun body and connected to the air valve;
wherein depressing the trigger moves the air valve so that the piston moves from the first position to the second position causing material to be dispensed.
19. The spray gun for fast setting plural component materials of claim 18 further comprising:
a piston stop located between the piston and an end of the gun body for preventing movement of the piston; and
a safety lock located outside the gun body and connected to the piston stop for engaging and disengaging the piston stop;
wherein when the piston stop is engaged the piston stop prevents the piston from moving when the trigger is depressed.
20. The spray gun for fast setting plural component materials of claim 18 further comprising:
a muffler attached to the gun body for reducing noise.
21. The spray gun for fast setting plural component materials of claim 17 further comprising:
a fitting connected to said purge air passage for receiving protective material.
22. The spray gun for fast setting plural component materials of claim 21 wherein:
the fitting connected to said purge air passage comprises a zerk fitting.
23. The spray gun for fast setting plural component materials of claim 17 further comprising:
a fastener for retaining said first and second seal cartridges in the fluid housing.
24. The spray gun for fast setting plural component materials of claim 23 wherein:
the fastener comprises a retaining ring.
25. A spray gun for fast setting plural component materials, said spray gun comprising:
a gun body;
an air cap;
a fluid housing attached to said gun body, said fluid housing having:
generally opposed first and second radial ports; and
a mix chamber located therein and comprising an elongate body having first and second flattened sides comprising mix chamber seal surfaces; and
first and second seal cartridges retained in said first and second radial ports and sealing against the flattened sides of said mix chamber;
wherein said first and second seal cartridges and said mix chamber seal surfaces are comprised of a hardened material.
26. The spray gun for fast setting plural component materials of claim 25 further comprising a fluid manifold removably fastened to said fluid housing, said fluid manifold being sealed thereto by an o-ring.
27. The spray gun for fast setting plural component materials of claim 25 further comprising:
a fastener for retaining said cartridges to the fluid housing.
28. The spray gun for fast setting plural component materials of claim 25 further comprising a retaining ring that engages a threaded surface of the fluid housing and is configured to be removable by hand.
29. The spray gun for fast setting plural component materials of claim 25 wherein:
said first and second seal cartridges each comprise:
a cartridge housing mounted to one of the radial ports;
a seal having a cartridge seal surface and being located within the cartridge housing so that a spring biases the cartridge seal surface against one of the first and second flattened sides; and
a spring disposed between the cartridge housing and the seal.
30. The spray gun for fast setting plural component materials of claim 29 further comprising:
a purge air passage located in said fluid housing and intersecting the mix chamber.
31. The spray gun for fast setting plural component materials of claim 30 further comprising:
a grease fitting coupled to said purge air passage.
32. The spray gun for fast setting plural component materials of claim 25 wherein the hardened material comprises 440C stainless steel.
33. A spray gun for fast setting plural component materials, said spray gun comprising:
a gun body;
an air cap;
a fluid housing attached to said gun body, said fluid housing comprising:
generally opposed first and second radial ports;
a mix chamber located therein; and
one or more check valves;
a lock ring for attaching said fluid housing to said gun body wherein said lock ring is configured to be loosened by hand to allow removal of the fluid housing from the gun body;
first and second seal cartridges configured to be removed by hand retained in said radial ports and sealing against said mix chamber; and
a retaining ring for retaining said first and second seal cartridges in said radial ports that engages a threaded surface of the fluid housing and is configured to be removable by hand.
34. The spray gun for fast setting plural component materials of claim 33, further comprising:
a fluid manifold assembly comprising:
first and second fluid valves; and
a one piece stem having a hex head with a seal for shutting off fluid flow;
wherein the fluid manifold assembly is removably attached to the fluid housing from below using a bolt and sealing o-ring; and
wherein the first and second fluid valves of the fluid manifold assembly are capable of fluid communication with the first and second seal cartridges.
35. The spray gun for fast setting plural component materials of claim 33 wherein the mix chamber further comprises first and second flattened sides and wherein said first and second seal cartridges each comprise:
a cartridge housing mounted to one of the radial ports;
a seal having a cartridge seal surface and being located within the cartridge housing so that a spring biases the cartridge seal surface against one of the first and second flattened sides; and
a spring disposed between the cartridge housing and the seal.
36. The spray gun for fast setting plural component materials of claim 35 further comprising:
a purge air passage located in said fluid housing and intersecting the mix chamber.
37. The spray gun for fast setting plural component materials of claim 36 further comprising:
a grease fitting coupled to said purge air passage.
38. A spray gun for fast setting plural component materials, said spray gun comprising:
a gun body;
an air cap;
a fluid housing attached to said gun body, said fluid housing having:
generally opposed first and second radial ports; and
a mix chamber located therein and comprising an elongate body having first and second flattened sides comprising mix chamber seal surfaces;
a lock ring for attaching said fluid housing to said gun body wherein said lock ring is configured to be loosened by hand to allow removal of the fluid housing from the gun body;
first and second seal cartridges configured to be removed by hand retained in said first and second radial ports and sealing against said flattened sides of said mix chamber; and
a retaining ring for retaining said first and second seal cartridges in said first and second radial ports that engages a threaded surface of the fluid housing and is configured to be removable by hand;
wherein said first and second seal cartridges and said mix chamber seal surfaces are comprised of a hardened material.
39. The spray gun for fast setting plural component materials of claim 38 wherein said first and second seal cartridges each comprise:
a cartridge housing mounted to one of the first and second radial ports;
a seal having a cartridge seal surface and being located within the cartridge housing so that a spring biases the cartridge seal surface against one of the first and second flattened sides; and
a spring disposed between the cartridge housing and the seal.
40. The spray gun for fast setting plural component materials of claim 39 further comprising:
a purge air passage located in said fluid housing and intersecting the mix chamber.
41. The spray gun for fast setting plural component materials of claim 40 further comprising:
a grease fitting coupled to said purge air passage.
42. The spray gun for fast setting plural component materials of claim 38 wherein the hardened materials comprise 440C stainless steel.
US14/662,864 2002-10-22 2003-10-22 Plural component spray gun for fast setting materials Expired - Lifetime USRE46291E1 (en)

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US44157503P 2003-01-21 2003-01-21
US46212403P 2003-04-10 2003-04-10
US14/662,864 USRE46291E1 (en) 2002-10-22 2003-10-22 Plural component spray gun for fast setting materials
PCT/US2003/033422 WO2004037429A2 (en) 2002-10-22 2003-10-22 Plural component spray gun for fast setting materials
US10/532,436 US7694893B2 (en) 2002-10-22 2003-10-22 Plural component spray gun for fast setting materials
US201213446222A 2012-04-13 2012-04-13

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