CA1200536A - Spray gun - Google Patents
Spray gunInfo
- Publication number
- CA1200536A CA1200536A CA000427241A CA427241A CA1200536A CA 1200536 A CA1200536 A CA 1200536A CA 000427241 A CA000427241 A CA 000427241A CA 427241 A CA427241 A CA 427241A CA 1200536 A CA1200536 A CA 1200536A
- Authority
- CA
- Canada
- Prior art keywords
- fluid
- air
- nozzle
- fluid nozzle
- gun
- 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
Links
Classifications
-
- 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
-
- 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
- B05B15/14—Arrangements for preventing or controlling structural damage to spraying apparatus or its outlets, e.g. for breaking at desired places; Arrangements for handling or replacing damaged parts
- B05B15/18—Arrangements for preventing or controlling structural damage to spraying apparatus or its outlets, e.g. for breaking at desired places; Arrangements for handling or replacing damaged parts for improving resistance to wear, e.g. inserts or coatings; for indicating wear; for handling or replacing worn parts
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- 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
Landscapes
- Nozzles (AREA)
Abstract
IMPROVED AIR SPRAY GUN
Abstract of the Disclosure An improved air spray gun has a spray head assembly comprising separate but interconnectable elements including a fluid nozzle, a fluid inlet fitting and a fluid nozzle retainer. The elements mount at a forward end of the gun body without any threaded attachment to the body, and air air cap threaded onto the fluid nozzle retainer mounts an air nozzle.
Because the elements are separate, the fluid nozzle and fluid inlet fitting may conveniently be manufactured of a corrosion resistant material such as stainless steel, thereby to prevent fluid passages through the same from being corroded by fluid sprayed from the gun.
Also, because the air cap threads onto the fluid nozzle retainer and not the gun body, there is no danger of damaging any threads on the body, which could otherwise require replacement of the body.
Abstract of the Disclosure An improved air spray gun has a spray head assembly comprising separate but interconnectable elements including a fluid nozzle, a fluid inlet fitting and a fluid nozzle retainer. The elements mount at a forward end of the gun body without any threaded attachment to the body, and air air cap threaded onto the fluid nozzle retainer mounts an air nozzle.
Because the elements are separate, the fluid nozzle and fluid inlet fitting may conveniently be manufactured of a corrosion resistant material such as stainless steel, thereby to prevent fluid passages through the same from being corroded by fluid sprayed from the gun.
Also, because the air cap threads onto the fluid nozzle retainer and not the gun body, there is no danger of damaging any threads on the body, which could otherwise require replacement of the body.
Description
~ackground of the Invention The present invention relates to air spray guns in general, and in particular to an improved air spray gun havins a spray head assembly comprising separate elements mounted on a forward end of the gun body without threaded attachment to the body.
Pluid passages through the head of an air spray gun are often made of a corrosion resistant material for protection against corrosion by various types of coating mzterials. Prior approaches to corrosion protection contemplated, generally, either use with the gun of a separate and removable corrosion resistant head czsting, or threading a stainless steel inse.rt and a stainless steel fluid inlet fitting into the gun head at right angles to each other, machining the inserts while they are in the gun to form fluid passages an~ then securing the inserts in place with epoxy. A problem encountered in the former approach is that a compromise occurs in the weight and balance considerations that are important to the "feel" of a spray gun, and in the latter approach loosening of the epoxy often occurs when a gun is soaked in solvent for an extended period of time. In addition, in prior spray guns the threads for receiving an zir cap for mounting an air nozzle on the head of the gun are usually formed on the gun body. This arrangement presents difficulties in that the threads a~e susceptible to damage, and if damaged then the entire gun body, which is essentially the entire gun, is ruined.
Pluid passages through the head of an air spray gun are often made of a corrosion resistant material for protection against corrosion by various types of coating mzterials. Prior approaches to corrosion protection contemplated, generally, either use with the gun of a separate and removable corrosion resistant head czsting, or threading a stainless steel inse.rt and a stainless steel fluid inlet fitting into the gun head at right angles to each other, machining the inserts while they are in the gun to form fluid passages an~ then securing the inserts in place with epoxy. A problem encountered in the former approach is that a compromise occurs in the weight and balance considerations that are important to the "feel" of a spray gun, and in the latter approach loosening of the epoxy often occurs when a gun is soaked in solvent for an extended period of time. In addition, in prior spray guns the threads for receiving an zir cap for mounting an air nozzle on the head of the gun are usually formed on the gun body. This arrangement presents difficulties in that the threads a~e susceptible to damage, and if damaged then the entire gun body, which is essentially the entire gun, is ruined.
-2 ., .~2~ 36 In improv.ing upon prior air spray guns of the type having corrosion resistant fluid passages, in the spray gun of the inven-tion the spray head assembly is comprised of separa-te but connectable elements including a fluid nozzle, a fluid inlet fitting and a fluid nozzle retainer. Since the elements are separate, the fluid inlet fitting and fluid nozzle may conveniently be manufactured from corrosion resistant material, and the arrangement of the elements offers significant improvements in weight, feel, maintenance and reliability of the gun. The components may readily be assembled on the forward end of the gun to provide corrosion resistant fluid passages without need for any machining or compromi.ses in the "Eeel"
of the gun, and the fluid nozzle retainer itself, not the gun body, has threads for mountin~ an air nozzle on the gun, so that should the threads be damaged only the nozzle retainer, and not the substantial entirety of the spray gun, needs to be replaced.
Therefore, in accordance with the present invention there is provided ~n ~ir spray gun having a gun body and a spray head assembly carried.at a forward end of the body for discharging therefrom an atomized spray of fluid. The spray head assembly comprises a fluid inlet fitting separate from the gun body and which has a passage therethrough connectable at one end with a supply of fluid. A fluid nozzle has a passage therethrough terminating at one end in a fluid outlet orifice.
The assembly further comprises a fluid nozzle retainer which is detachably connected to the fluid inlet fitting and which supports the fluid nozzle with adjoining other ends of the passages in communication with one another. Fluid introduced into -the one end oE the inlet fitting passage flows through the passages for being discharged from the fluid outlet orifice. ~to.~ in~ ~ir~ discharge means are provided at -the B one end of the fluid nozzle for discharging air to atomize into a spray fluid discharged from the fluid outlet orifice.
Further, a portion integral with and extending from the forward end of the gun body is provided. The inlet fitting and the fluid nozzle retainer compressibly capture the extension therebetween when the same are detachably connected together to mount the spray head assembly on the forward end of the gun body.
The foregoing and other objec-ts, advanta~es and features of the invention will become apparent upon a consideration oE the following deiailed description, when taken in conjunction with the accompanying drawings.
Brief Description of the Drawings Fig. 1 is a side elevation view, partly in cross section, illustrating an air spray gun having an improved spray head assembly in accordance with the teachings of the present invention;
Fig. 2 is an exploded cross sectional view of the spray head assembly illustrated in Fig. 1, and - 3a -'~, .~2(`~ 3~
Pig. 3 is a cross sectional assembly view of the spray head assembly.
Detailed Desori~,ion Referring to Pig. 1, an air sprzy gun assembly, indicated generally at 20, includes a paint spray Sun 22 having a handle 24 adapted for connection at a lower end thereof with a source of compressed air ~not shown) ,hrough a fitting 26. The gun has an air nozzle 28 and fluid nozzle means, indicated generally at 30, through which fluid provided to the gun through ~n inlet fitting 32 connected with a source thereof (not shown) is dispensed for being atomized into a spray and formed into a fan-shaped pattern by jets of air emitted from the air nozzle. l'o control the spraying operation, an air valve means 34 is movable between open and closed positions to.control a flow Qf pressurized air through the gun, a fluid valve stem 36 is movable between open and closed positions to control 2 flow of fluid through the fluid nozzle means and a manually manipulatable trigger 38 is operably connected with the valve means and stem, Tne trigger is mounted at an upper end by a pivot pin 40, and is manually movable between a gun of~ position away from the handle whereat the air valve means and fluid valve are closed, to a gun on position toward the handle whereat the air valve means and fluid valve are open and a spray of material is emitted.
Adjustment of an air control know 42 determines the 2mount of atomizing air emitted when the gun i5 on and adjust-ment of a fluid control kno`o 44 determines the dispensing rate of material.
~2t~5;~6 ~ he spray gun assembl5T thus far described is known in the art and, if conventional and having corrosion resistant fluid passageways, would ordinarily be provided eit~er ~ith a corrosion resistant spray head casting or a stainless steel fluid inlet insert and a stainless steel fluid outlet insert threaded into the head oF the gun at right angles to each other, machined while in the gun to form the fluid passage and secured in place Lf~ ~ ox~. However, since the gun body is usually aluminum so that it might have a light weight, a problem encountered in the former approach is that a compromise occurs in the weight and balance con-siderations that are important to the "feel" of a gun, and in the latter approach loosening of the epoxy often occurs when a gun is soaked in solvent for an extended period of time. Also, with conven-tional guns threads for receivi-ng an air cap for mounting an air nozzle are usually formed on the aluminum gun body, which presents dificulties in that aluminum threads are relativelv susceptible to damage, and iF they are damaged then the entire gun body is ruined.
In improving upon prior art spray guns, in 'he gun of the invention the spray head zssembiy comprises separate but connectable elements including a fluid nozzle, a fluid inlet fitting and a fluid nozzle retainer, which because they are separate enable the fluid nozzle and fluid inlet fitting to conveniently be manufactured out of a corrosion resistant material.
~he elements may readily be mounted on the forward end of the gun body without threaded aLtachment to the body, and provide corrosion resistant ~nd leakpro~f ~5 ;~ 36 fluid passages without need for any ~Chin;n9 or compromises in the n feel" of the gun. At the same time, the fluid nozzle retainer itself, not the gun body, has threads for mounting an air cap, so that should the threads be damaged only the nozzle retziner needs to be replaced, and not the subs_antial entirety of the sp-ay gun.
Referring also to Figs. 2 and 3, a spray head assembly, indicated generaliy at 46, is mounted on a downwardly depending extension 48 of a forward body portion 50 of the gun. The spray head assembly, which includes the fluid nozzle means 30, comprises the air nozzle 28 and the fluid inlet fitting 32, together with a fluid nozzle 52, a fluid nozzle xetainer 54 ænd an air cap 56. The inlet fitting and the fluid nozzle have respective fluid passages 58 and 60 thereth~ough, and are made of a material which is corrosion resistant to fluids conveyed through the passages, for example stainless steel or hardened steel.
The inlet fltting 32 is L-shaped and the extension 48 of the body 50 has a passage 62 therethrough which has a relatively small diameter at an inner end, increases in diameter toward an outer end and defines two shoulders 64 and 66. One leg of the inlet fitting has threads 68 and is extendable through the passage~
62 for connection with the fluid nozzle retainer 54 by means of corresponding threads 70 thereon, thereby to mount the inlet fitting and fluid nozzle retainer on the forwzrd end of the gun body. When the two elements are securely tightened together, shoulders 72 and 74 on the fluid nozzle retainer abut and seal with the shoulders 64 and 66, respectively.
of the gun, and the fluid nozzle retainer itself, not the gun body, has threads for mountin~ an air nozzle on the gun, so that should the threads be damaged only the nozzle retainer, and not the substantial entirety of the spray gun, needs to be replaced.
Therefore, in accordance with the present invention there is provided ~n ~ir spray gun having a gun body and a spray head assembly carried.at a forward end of the body for discharging therefrom an atomized spray of fluid. The spray head assembly comprises a fluid inlet fitting separate from the gun body and which has a passage therethrough connectable at one end with a supply of fluid. A fluid nozzle has a passage therethrough terminating at one end in a fluid outlet orifice.
The assembly further comprises a fluid nozzle retainer which is detachably connected to the fluid inlet fitting and which supports the fluid nozzle with adjoining other ends of the passages in communication with one another. Fluid introduced into -the one end oE the inlet fitting passage flows through the passages for being discharged from the fluid outlet orifice. ~to.~ in~ ~ir~ discharge means are provided at -the B one end of the fluid nozzle for discharging air to atomize into a spray fluid discharged from the fluid outlet orifice.
Further, a portion integral with and extending from the forward end of the gun body is provided. The inlet fitting and the fluid nozzle retainer compressibly capture the extension therebetween when the same are detachably connected together to mount the spray head assembly on the forward end of the gun body.
The foregoing and other objec-ts, advanta~es and features of the invention will become apparent upon a consideration oE the following deiailed description, when taken in conjunction with the accompanying drawings.
Brief Description of the Drawings Fig. 1 is a side elevation view, partly in cross section, illustrating an air spray gun having an improved spray head assembly in accordance with the teachings of the present invention;
Fig. 2 is an exploded cross sectional view of the spray head assembly illustrated in Fig. 1, and - 3a -'~, .~2(`~ 3~
Pig. 3 is a cross sectional assembly view of the spray head assembly.
Detailed Desori~,ion Referring to Pig. 1, an air sprzy gun assembly, indicated generally at 20, includes a paint spray Sun 22 having a handle 24 adapted for connection at a lower end thereof with a source of compressed air ~not shown) ,hrough a fitting 26. The gun has an air nozzle 28 and fluid nozzle means, indicated generally at 30, through which fluid provided to the gun through ~n inlet fitting 32 connected with a source thereof (not shown) is dispensed for being atomized into a spray and formed into a fan-shaped pattern by jets of air emitted from the air nozzle. l'o control the spraying operation, an air valve means 34 is movable between open and closed positions to.control a flow Qf pressurized air through the gun, a fluid valve stem 36 is movable between open and closed positions to control 2 flow of fluid through the fluid nozzle means and a manually manipulatable trigger 38 is operably connected with the valve means and stem, Tne trigger is mounted at an upper end by a pivot pin 40, and is manually movable between a gun of~ position away from the handle whereat the air valve means and fluid valve are closed, to a gun on position toward the handle whereat the air valve means and fluid valve are open and a spray of material is emitted.
Adjustment of an air control know 42 determines the 2mount of atomizing air emitted when the gun i5 on and adjust-ment of a fluid control kno`o 44 determines the dispensing rate of material.
~2t~5;~6 ~ he spray gun assembl5T thus far described is known in the art and, if conventional and having corrosion resistant fluid passageways, would ordinarily be provided eit~er ~ith a corrosion resistant spray head casting or a stainless steel fluid inlet insert and a stainless steel fluid outlet insert threaded into the head oF the gun at right angles to each other, machined while in the gun to form the fluid passage and secured in place Lf~ ~ ox~. However, since the gun body is usually aluminum so that it might have a light weight, a problem encountered in the former approach is that a compromise occurs in the weight and balance con-siderations that are important to the "feel" of a gun, and in the latter approach loosening of the epoxy often occurs when a gun is soaked in solvent for an extended period of time. Also, with conven-tional guns threads for receivi-ng an air cap for mounting an air nozzle are usually formed on the aluminum gun body, which presents dificulties in that aluminum threads are relativelv susceptible to damage, and iF they are damaged then the entire gun body is ruined.
In improving upon prior art spray guns, in 'he gun of the invention the spray head zssembiy comprises separate but connectable elements including a fluid nozzle, a fluid inlet fitting and a fluid nozzle retainer, which because they are separate enable the fluid nozzle and fluid inlet fitting to conveniently be manufactured out of a corrosion resistant material.
~he elements may readily be mounted on the forward end of the gun body without threaded aLtachment to the body, and provide corrosion resistant ~nd leakpro~f ~5 ;~ 36 fluid passages without need for any ~Chin;n9 or compromises in the n feel" of the gun. At the same time, the fluid nozzle retainer itself, not the gun body, has threads for mounting an air cap, so that should the threads be damaged only the nozzle retziner needs to be replaced, and not the subs_antial entirety of the sp-ay gun.
Referring also to Figs. 2 and 3, a spray head assembly, indicated generaliy at 46, is mounted on a downwardly depending extension 48 of a forward body portion 50 of the gun. The spray head assembly, which includes the fluid nozzle means 30, comprises the air nozzle 28 and the fluid inlet fitting 32, together with a fluid nozzle 52, a fluid nozzle xetainer 54 ænd an air cap 56. The inlet fitting and the fluid nozzle have respective fluid passages 58 and 60 thereth~ough, and are made of a material which is corrosion resistant to fluids conveyed through the passages, for example stainless steel or hardened steel.
The inlet fltting 32 is L-shaped and the extension 48 of the body 50 has a passage 62 therethrough which has a relatively small diameter at an inner end, increases in diameter toward an outer end and defines two shoulders 64 and 66. One leg of the inlet fitting has threads 68 and is extendable through the passage~
62 for connection with the fluid nozzle retainer 54 by means of corresponding threads 70 thereon, thereby to mount the inlet fitting and fluid nozzle retainer on the forwzrd end of the gun body. When the two elements are securely tightened together, shoulders 72 and 74 on the fluid nozzle retainer abut and seal with the shoulders 64 and 66, respectively.
3~
To connect the fluid nozzle 52 with the fluid nozzle retainer 5~, the nozzle is extended int~
the retainer and threadably engaged therewith by means of respective threads 76 and 78 on the nozzl~
and retainer until a seat 80 at an inner end of the no7zle moves against and seals with a seat 82 at the outer end of the passage 58 through the inlet fitting 32. This connects the inlet fitting, fluid nozzle retainer and fluid nozzle together and establishes a lea~proof path through the fluid passages 58 and 60 in the inlet fitting and nozzle.
To complete the spray head assembly 46, the air nozzle 28 is moved over the outer end of the fluid nozzle 52 to extend an outer end 84 of the fluid nozzle into a passage 86 formed centrally through a front wall of the air nozzle and until a shoulder 88 of the air nozzle engages and seats against a shoulder 90 of the fluid nozzle. The air cap ~6 is then placed around the air nozzle and threaded onto the fluid nozzle retainer 54 by means of internal threads 92 on the air cap and external threads 94 on the retainer uDtil a radially inwardly extending annular flange 96 at the outer end o, the air cap engages a radially outwardly extending annular flange 98 of th~ air nozzle and moves the air nozzle against the fluid nozzle to form a seal between the shoulders 88 and 90.
It is to be appreciated that the entirety of the spray head assembly 46, which include~s the air nozzle 28, the inle~ fitting 32, the fluid nozzle 52, the fluid nozzle retainer 54 and the air- cap 56, is mounted on the forward end of the spray gun body 50 without aDy threaded at.achment to the body. It is ,-(}~36 also to be appreciated that since all of the el2men~s of the spray head assembly are separate and distin~t, they may very conveniently be manufactured of Any selected material and, if necessary, readily dis-assembled for repair or replacement without need to repair or replace the entirety of the spray head assembly.
Referring in particular to Fig. 2, to provide atomizing air to the spray head assembly 46, the gun body 50 has an air passage 100 which receives air under pressure upon openin~ of the air valve means 34, and an air valve stem 102 extends through the passage to against a seat 104 at a forward end thereof. The air valve stem is connected with the trigger 38 for being retracted when the gun is turned on, wi~h the amount of retraction being determined by the set~ing of the air control knob 42, and when retracted establishes c~mm~-nication between the passage 100 and an annular passage 106 in the body extension 48 leading both to pattern forming air outiet orifices 108 in opposed ears or wings of the air nozzle 28 and to an annular atomizing air outlet orifice 110 defined between the outer extension 84 of the fluid nozzle 52 and ~-e walls of the air nozzle passage 86. To establish a path between the passage 106 and the orifices 108, passages 112 are forned through the fluid no7zle retainer and passages 114 through the ears of the air nozzle, and to provide air to the orifice 110, passages 116 are formed through the fluid nozzle. Thus, triggering the gun discharges ai~ for atomizing dispensed material into ~2~ 53~
,.
a spray and forming the spray into`a fan-shaped pattern.
To control dispensing of fluid or coating material, the fluid valve stem 36 extends through an opening 118 formed in the rearward end of the fluid inlet fitting 32 and thence throush the aligned fluid passages 58 and 60 to 2 forward tapered valve seat 120 in the fluid nozzle passage. The valve stem is sealed with the opening 118 by means of a packing gland 122 aDd a compression fitting 124, and a forward end of the stem is provided with a taper 126 for v -nt against the valve seat. The rearward end of the valve stem is connected with the trigger ~, whereby operation of the trigger to turn on the gun retracts the stem from the valve seat for dispensing of coating material from an outlet orifice 128 at the end of the fluid nozzle 52. Consequently, upon retracting the gun trigger iluid is discharged from the spray head assembly and is atomi~ed and formed into a fan-shaped spray~
The invention thus provides an improved air spray gun having a spray head assembly formed of discrete componen~s for ease in manufacture, assembly and replacemen, or repair of the same. The entirety of the spray head assemhly, including the air cap for the air nozzle, is connected with the forward end of the gun body wiLhout need for any threaded connec-tions with the body, whereby there are no threads on the gun body which may be damaged by the assembly.
While one embodiment of the invention has been described in detail, various modifications and other embodi~ents thereof may he_devised by one skilled in _9_ "
i ~ 3 6 ,.
the art w~thout departins from the spirit and scope, of the invention, as defined in the appended claims.
(
To connect the fluid nozzle 52 with the fluid nozzle retainer 5~, the nozzle is extended int~
the retainer and threadably engaged therewith by means of respective threads 76 and 78 on the nozzl~
and retainer until a seat 80 at an inner end of the no7zle moves against and seals with a seat 82 at the outer end of the passage 58 through the inlet fitting 32. This connects the inlet fitting, fluid nozzle retainer and fluid nozzle together and establishes a lea~proof path through the fluid passages 58 and 60 in the inlet fitting and nozzle.
To complete the spray head assembly 46, the air nozzle 28 is moved over the outer end of the fluid nozzle 52 to extend an outer end 84 of the fluid nozzle into a passage 86 formed centrally through a front wall of the air nozzle and until a shoulder 88 of the air nozzle engages and seats against a shoulder 90 of the fluid nozzle. The air cap ~6 is then placed around the air nozzle and threaded onto the fluid nozzle retainer 54 by means of internal threads 92 on the air cap and external threads 94 on the retainer uDtil a radially inwardly extending annular flange 96 at the outer end o, the air cap engages a radially outwardly extending annular flange 98 of th~ air nozzle and moves the air nozzle against the fluid nozzle to form a seal between the shoulders 88 and 90.
It is to be appreciated that the entirety of the spray head assembly 46, which include~s the air nozzle 28, the inle~ fitting 32, the fluid nozzle 52, the fluid nozzle retainer 54 and the air- cap 56, is mounted on the forward end of the spray gun body 50 without aDy threaded at.achment to the body. It is ,-(}~36 also to be appreciated that since all of the el2men~s of the spray head assembly are separate and distin~t, they may very conveniently be manufactured of Any selected material and, if necessary, readily dis-assembled for repair or replacement without need to repair or replace the entirety of the spray head assembly.
Referring in particular to Fig. 2, to provide atomizing air to the spray head assembly 46, the gun body 50 has an air passage 100 which receives air under pressure upon openin~ of the air valve means 34, and an air valve stem 102 extends through the passage to against a seat 104 at a forward end thereof. The air valve stem is connected with the trigger 38 for being retracted when the gun is turned on, wi~h the amount of retraction being determined by the set~ing of the air control knob 42, and when retracted establishes c~mm~-nication between the passage 100 and an annular passage 106 in the body extension 48 leading both to pattern forming air outiet orifices 108 in opposed ears or wings of the air nozzle 28 and to an annular atomizing air outlet orifice 110 defined between the outer extension 84 of the fluid nozzle 52 and ~-e walls of the air nozzle passage 86. To establish a path between the passage 106 and the orifices 108, passages 112 are forned through the fluid no7zle retainer and passages 114 through the ears of the air nozzle, and to provide air to the orifice 110, passages 116 are formed through the fluid nozzle. Thus, triggering the gun discharges ai~ for atomizing dispensed material into ~2~ 53~
,.
a spray and forming the spray into`a fan-shaped pattern.
To control dispensing of fluid or coating material, the fluid valve stem 36 extends through an opening 118 formed in the rearward end of the fluid inlet fitting 32 and thence throush the aligned fluid passages 58 and 60 to 2 forward tapered valve seat 120 in the fluid nozzle passage. The valve stem is sealed with the opening 118 by means of a packing gland 122 aDd a compression fitting 124, and a forward end of the stem is provided with a taper 126 for v -nt against the valve seat. The rearward end of the valve stem is connected with the trigger ~, whereby operation of the trigger to turn on the gun retracts the stem from the valve seat for dispensing of coating material from an outlet orifice 128 at the end of the fluid nozzle 52. Consequently, upon retracting the gun trigger iluid is discharged from the spray head assembly and is atomi~ed and formed into a fan-shaped spray~
The invention thus provides an improved air spray gun having a spray head assembly formed of discrete componen~s for ease in manufacture, assembly and replacemen, or repair of the same. The entirety of the spray head assemhly, including the air cap for the air nozzle, is connected with the forward end of the gun body wiLhout need for any threaded connec-tions with the body, whereby there are no threads on the gun body which may be damaged by the assembly.
While one embodiment of the invention has been described in detail, various modifications and other embodi~ents thereof may he_devised by one skilled in _9_ "
i ~ 3 6 ,.
the art w~thout departins from the spirit and scope, of the invention, as defined in the appended claims.
(
Claims (12)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A spray gun having a gun body and a spray head assembly carried at a forward end of said body for discharging therefrom an atomized spray of fluid, said spray head assembly comprising a fluid inlet fitting separate from said gun body and which has a passage therethrough connectable at one end with a supply of fluid; a fluid nozzle which has a passage therethrough terminating at one end in a fluid outlet orifice; a fluid nozzle retainer which is detachably connected to said fluid inlet fitting and which supports said fluid nozzle with adjoining other ends of said passages in communication with one another, whereby fluid introduced into said one end of said inlet fitting passage flows through said passages for being discharged from said fluid outlet orifice; air discharge means at said one end of said fluid nozzle for discharging air for flow against fluid discharged from said fluid outlet orifice, said air discharge means being detachably connected with said fluid nozzle retainer; and a portion integral with and extending from said forward end of said gun body, said inlet fitting and fluid nozzle retainer compressibly capturing said extension therebetween when the same are detachably connected together to mount said spray head assembly on said forward end of said gun body.
2. A spray gun as claimed in claim 1, wherein said extending body portion comprises a downwardly depending circular portion at said forward end of said body, said circular portion having a passage therethrough, said inlet fitting and fluid nozzle retainer, when detachably interconnected, extending into opposite ends of said circular portion passage and compressibly gripping said circular portion therebetween.
3. A spray gun as claimed in claim 1 or 2, wherein said fluid nozzle is separately detachably connected to said fluid nozzle retainer.
4. A spray gun as claimed in claim 1, wherein said fluid nozzle and said fluid nozzle retainer are detachably interconnected by mating screw threads respective thereon.
5. A spray gun as claimed in claim 1, wherein said air discharge means is detachably connected to said fluid nozzle retainer.
6. A spray gun as claimed in claim 1, wherein said air discharge means comprises an air nozzle at a forward end of said fluid nozzle and having a passage formed centrally therethrough for receiving therein said fluid nozzle outlet orifice, said air nozzle having at least one air outlet orifice for discharging air therefrom and an air cap disposed around said air nozzle and detachably connected to said fluid nozzle retainer for mounting said air nozzle on said fluid nozzle, said gun body having an air passage therethrough for furnishing supply of air under pressure to said air outlet orifice.
7. A spray gun as claimed in claim 6, wherein said fluid nozzle outlet orifice discharges a stream of fluid and said at least one air nozzle outlet orifice comprises an annular air outlet orifice around said fluid nozzle outlet orifice, for discharging air to atomize the fluid stream, and air outlet orifices to opposite sides of said fluid nozzle outlet orifice for discharging air to form the atomized fluid into a generally fan-shaped spray.
8. A spray gun as defined in any preceding claim 7, in which said fluid inlet fitting and said fluid nozzle retainer are detachably interconnected by mating screw threads respectively thereon.
9. A spray gun having a gun body and a spray head assembly carried at a forward end of said body for discharging therefrom an atomized spray of fluid, said gun body having a downwardly depending generally annular extension at said forward end and said spray head assembly comprising a fluid inlet fitting separate from said gun body and having a passage therethrough connectable at one end with a supply of fluid, a portion of said inlet fitting extending forwardly into said annular extension and having therein an opposite end of said passage; a fluid nozzle retainer, a portion of said fluid nozzle retainer extending rearwardly into said annular extension and into detachable screw-threaded connection with said inlet fitting portion, said inlet fitting and said fluid nozzle retainer compressibly capturing said annular extension therebetween, whereby said annular extension mounts said inlet fitting and said fluid nozzle retainer on said forward end of said gun body; a fluid nozzle having a passageway therethrough terminating at a forward end in a fluid outlet orifice, said fluid nozzle being detachably screw-threadably connected to said fluid nozzle retainer with a rearward end of said fluid nozzle passage in communication with said opposite end of said inlet fitting passage, so that a path is established for a flow of fluid from said one end of said inlet fitting passage to and through said fluid nozzle outlet orifice;
and air discharge means at said forward end of said fluid nozzle for discharging air for flow against fluid flowing through said outlet orifice.
and air discharge means at said forward end of said fluid nozzle for discharging air for flow against fluid flowing through said outlet orifice.
10. A spray gun as in claim 9, wherein said air discharge means comprises an air nozzle detachably carried on said forward end of said fluid nozzle, said air nozzle having at least one air outlet orifice for discharging air for flow against fluid flowing from said fluid outlet orifice, and an air cap disposed around said air nozzle in detachable screw-threaded connection with said fluid nozzle retainer to mount said air nozzle on said fluid nozzle, whereby said spray head assembly is carried on the forward end of said gun body without need for any screw-threaded connection with said body.
11. A spray gun as claimed in claim 10, wherein said fluid nozzle outlet orifice is for discharging a stream of fluid and said at least one air nozzle outlet orifice includes a plurality of air outlet orifices for discharging air for atomizing the stream of fluid and for shaping the atomizing fluid into a generally fan-shaped spray.
12. A spray gun as claimed in claims 1 or 9, wherein said fluid inlet fitting and said fluid nozzle are of a material which is corrosion-resistant to fluid flowing through said passages thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/848,580 US4184569A (en) | 1977-06-15 | 1977-11-04 | Ladder standoff and ridge pole hook |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US37425782A | 1982-05-03 | 1982-05-03 | |
| US374,257 | 1982-05-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1200536A true CA1200536A (en) | 1986-02-11 |
Family
ID=23475971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000427241A Expired CA1200536A (en) | 1977-06-15 | 1977-06-15 | Spray gun |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS5932968A (en) |
| CA (1) | CA1200536A (en) |
| DE (1) | DE3316113C2 (en) |
| FR (1) | FR2525924B1 (en) |
| GB (1) | GB2119288B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3346165C2 (en) * | 1983-12-21 | 1987-04-30 | Hartmut 2905 Edewecht Ihmels | Spray agent insert for spray guns |
| EP0215889B1 (en) * | 1985-03-27 | 1992-07-15 | ILOTT, Jan | Improvements in or relating to gas-operated spraying equipment |
| US4941614A (en) * | 1986-11-26 | 1990-07-17 | Jan Ilott | Nozzle for spraying equipment |
| RU2129919C1 (en) * | 1997-07-01 | 1999-05-10 | Конструкторское бюро "Арматура" | Liquid spraying and delivery device |
| DE19958569C1 (en) * | 1999-12-04 | 2001-02-15 | Sata Farbspritztechnik | Paint spray gun with threaded body and ring, thread of which is trapezoid |
| US6520426B2 (en) | 2000-01-26 | 2003-02-18 | Spraying Systems Co. | Sanitary spray nozzle for spray guns |
| JP2007021459A (en) * | 2005-07-21 | 2007-02-01 | Meiji Kikai Seisakusho:Kk | Automatic spray gun |
| FR3153006A1 (en) * | 2023-09-19 | 2025-03-21 | Armand BAILLY | Circuit for spraying a food product and assembly for spraying a food product comprising such a circuit |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1975903A (en) * | 1927-12-27 | 1934-10-09 | Ernst Z Munz | Spraying device |
| BE384829A (en) * | 1930-12-23 | |||
| GB425099A (en) * | 1932-09-06 | 1935-02-26 | Vilbiss Co | Improvements relating to spray guns |
| US2247000A (en) * | 1938-05-28 | 1941-06-24 | Popoff Mintscho | Spraying process and apparatus |
| US2864649A (en) * | 1956-11-26 | 1958-12-16 | Cline Electric Mfg Co | Spray gun |
| US3589621A (en) * | 1969-02-28 | 1971-06-29 | Ransburg Electro Coating Corp | Spray device |
| US3734406A (en) * | 1971-07-30 | 1973-05-22 | Nordson Corp | Method and apparatus for producing a flat fan paint spray pattern |
-
1977
- 1977-06-15 CA CA000427241A patent/CA1200536A/en not_active Expired
-
1983
- 1983-04-29 GB GB08311708A patent/GB2119288B/en not_active Expired
- 1983-05-02 JP JP58076350A patent/JPS5932968A/en active Granted
- 1983-05-03 FR FR8307315A patent/FR2525924B1/en not_active Expired
- 1983-05-03 DE DE3316113A patent/DE3316113C2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6344019B2 (en) | 1988-09-02 |
| DE3316113C2 (en) | 1986-10-30 |
| FR2525924A1 (en) | 1983-11-04 |
| GB8311708D0 (en) | 1983-06-02 |
| JPS5932968A (en) | 1984-02-22 |
| GB2119288B (en) | 1985-09-18 |
| GB2119288A (en) | 1983-11-16 |
| FR2525924B1 (en) | 1987-02-27 |
| DE3316113A1 (en) | 1983-11-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |