CA1222701A - Filter assembly - Google Patents
Filter assemblyInfo
- Publication number
- CA1222701A CA1222701A CA000442639A CA442639A CA1222701A CA 1222701 A CA1222701 A CA 1222701A CA 000442639 A CA000442639 A CA 000442639A CA 442639 A CA442639 A CA 442639A CA 1222701 A CA1222701 A CA 1222701A
- Authority
- CA
- Canada
- Prior art keywords
- filter assembly
- body member
- filter
- conical seat
- annular
- 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
Abstract
ABSTRACT OF THE DISCLOSURE
A compact inline filter assembly particularly adapted for use in a liquid paint supply system for removing foreign particulate matter at a point upstream from a manual or automatic spray nozzle. The filter assembly comprises an integral tubular body member provided with female and male threaded connections at the ends thereof and a replaceable filter element com-prising a tapered ferrule and an integral fine mesh screen removably seated within the body member and clamped in axially centered relationship by a threaded male connection engaged with the body member.
A compact inline filter assembly particularly adapted for use in a liquid paint supply system for removing foreign particulate matter at a point upstream from a manual or automatic spray nozzle. The filter assembly comprises an integral tubular body member provided with female and male threaded connections at the ends thereof and a replaceable filter element com-prising a tapered ferrule and an integral fine mesh screen removably seated within the body member and clamped in axially centered relationship by a threaded male connection engaged with the body member.
Description
FILTER ASSEMB~Y
~ACKGROUND OF THE INVENTION
A continuing problem associated with the spray application of liquid paints is the presenc~ of foreign particulate matter in the liquid paint supply which causes imperfections on the surfaces of an article being spray painted $requently necessitating a refinish-ing and repainting thereof. Such foreign particulate matter sometimes referred to as "seeds", or "strings", or "slugs" are formed in many instances as a result of an agglomeration of the paint constituents during standing or recirculation of the liquid paint necessi-tating removal prior to discharge through the spray nozzle. The foregoing problem is particularly pro-nounced in recirculating-type liquid paint systems which are in widespread commercial use for keeping heavily-bodied pigments uniformly suspended in the liquid paint thereby assuring uniformity in the color and quality of the paint film applied to an article being painted. Such recirculating paint systems usually comprise a mixing tank equipped with suitable agitation for maintaining the paint uniformly mixed and a pump for transferring the liquid paint under a desired pressure to an automatic or manual spray nozzle in an amount in excess of that required which is re-turned through a suitable r~turn conduit to the mixing tank. In spite of the provision of suitable ~ilters in the recirculating supply line, the accumulation of foreiyn particulate matter occurs resulting in objec-tionable spray patterns.
The foregoing problem is also encountered during the spray application of paints supplied from a suction tank or cup directly connected to the spray gun. In recognition of this problem, a variety of filter devices have heretofore been proposed or used in liquid paint supply systems which are adapted to be connected at a point in close proximity to the spray nozzle effecting a fin~l filtration just prior to entry of the spray assembly. Prior art filter assemblies of the types heretofoxe known are generally characterized by their relatively large size and associated weight, by their multiple component construction increasing the complexity and cost of the assembly as well as diffi-culty during cleaning and replacement of the filter cartridges, and their relatively large volume requiring increased time to effect a purging of the internal volume thereof such as occasioned when changing paint colors in a multiple-color recirculating paint supply system. Such prior art filter assemblies because of their size and weight have not received widespread commercial acceptance in hand-held paint spray systems due to the awkwardness of the resulting assembly.
t~
The present invention overcomes many of the problems and disadvantages associated with prior art filter assemblies by providiny a compact, simple, light-weight and highly efficient inline filter assembly which is versatile in use and can be installed at any one of a variety of locations in a liquid paint supply system. The compact and simple construction of the filt~r assembly enables attachment directly to a hand-held spray gun without materially increasing the weight of the assembly as well as to automatic spray equip-ment. The simplicity and efficiency of the filter assembly facilitates periodic cleaning of the filter-ing element thereof and provides for a 19w cost simple and efficient assembly.
SUMMARY OF THE INVENTION
The benefits and advantages of the present invention are achieved by an inline filter assembly which comprises an integral tubular body member formed with a through-bore having an annular tapered shoulder intermediate of the upstream and downstream ends there-of. The downs~ream end of the body member is formed with an internal thread extending inwardly of the bore toward the tapered shoulder for ~hreadably receiving a male connection formed with a conically tapered seat adjacent to the end thereof. A removable filter element is disposed within the body member and comprises an ~Z;~70il annular ferrule formed with a first annular conic 1 seat adapted to be disposed in seated sealing relationship on the tapered shoulder within the body member and a sec-ond annular conical seat adapted to be disposed in seated sealing relationship on the conically tapered seat of the male connection to which the body member is attached.
A thimble-shaped filter screen of an integral construc-tion is affixed to the ferrule adjacent to the first conical seat and projects axially within the bore toward the upstream end thereo for receiving and fil-tering a supply of liquid paint entering the upstream end of the body member. The upstream end portion of the filter assembly is provided with suita~le connect-ing means such as an external thread for removably connecting the filter assembly to a paint supply sys-temO
Additional benefits and advantages of the pxesent invention will become apparent upon a reading of the Description of the Preferred Embodiments taken in conjunction with the accompanying drawing.
BRIEF DESCRIPTION OF THE DRAWING
Figure l is a side elevational view, partly schematic, of a typical air atomizing type spray gun incorporating a filter assembly of the present inven-tion connected through a quick-disconnect connection to a pressurized liquid paint supply system;
7~
Figure 2 is an enlarged transverse sectional view o the filter assembly connected to the inlet of the spray gun as shown in Figure l;
Figure 3 is a side elevational view of the removable filter element of the filtex assembly shown in Figure 2;
Figure 4 is an end ~iew of the filter element as shown in Figure 3; and Figure 5 is a side elevational view of the tubular body member of the filter assembly.
DESCRIPTION OF THE PREFERRED EM~ODIMENTS
Referring now in detail to the drawings, and as may be best seen in Figure 1, a spray gun 10 of the conventional air atomization type is shown including a hand grip 12 having the butt end thereof connected to an air hose 14 for supplying pressurized atomizing air to the spray nozzle. The spray gun is further provided with a pivotally mounted trigger 16 for con-trolling the discharge of an air atomized spray of paint from a mixing nozzle 18 at the forward end there-of. The internal structural arrangements of the spray gun 10 can be of any of the types well-known and com-mercially available including airless type spray equip-ment as well as manual and automatic spray equipment.
In the specific arrangement as illus~rated in Figure 1, a supply of pressurized liquid paint 70~.
enters the gun through a threaded coupling 20 which in turn is secured to the filter assembly 22 of the present invention which in turn is connected to a coupling 24 having a quick-disconnect stem secured thereto and removably engaged by a quick~disconnect fitting 26 connected to a flexible paint supply tube 28. This arrangement is typical of a recirculating paint flow control system which advantageously can further incorporate a flow control device of the gen-iO eral type as described in U.S. Patent No. 4,106,699.
While only one filter assembly 22 is employed in the arrangement of ~igure 1, a second filter assembly can advantageously be employed in the paint supply line located at the inlet side of the quick-disconnect coupling 26 to provide an initial fil~ering action followed by a final filtering action by the assembly 22. This latter arrangement is particularly desirable in a multiple color paint supply system whereby the spray gun lO is disconnected from one color paint supply source and connected to a second pressurized paint supply source having a different color paint. Under such cir-cumstances, it will be appreciated that the internal volume of the inline filter assembly 22 is important in minimizing purging of the prior paint color thereby saving time ~nd also reducing wastage of paint prior to resumption of the painting operation.
7~
It is also contemplated that in lieu of a remote supply of pressurized liqui~ paint, the ~ilter assembly 22 can be interposed in the position as shown between a conventional suction-type paint cup directly connected to the spray gun and portable therewith as in the case of paint applications involving smaller areas such in automobile body repair centers.
Referring now to Figures 2~5 of the drawing, the filter assembly 22 comprises an integral tubular body member 30 formed with a threaded counter-bore 32 in the downstream section thereof disposed in communi-cation with a smooth bore 34 in the upstream section thereof and defining at their intersection an annular tapered shoulder 36 against which a filter element 38 is adapted to be removably seated and in axial align-ment relative to the bore 34. The downstream end of the body member 30 is preferably provided with flats 40 disposed in a hexagonal arrangement as shown in Figure 5 for engagement by a wrench. The upstream section of the body member 30 is preferably provided with an external threaded section 42 for attachment of the filter assembly to the paint supply conduit such as the quick-disconnect coupling 24 as shown in Figure 1.
The filter element 38 as best seen in Figures
~ACKGROUND OF THE INVENTION
A continuing problem associated with the spray application of liquid paints is the presenc~ of foreign particulate matter in the liquid paint supply which causes imperfections on the surfaces of an article being spray painted $requently necessitating a refinish-ing and repainting thereof. Such foreign particulate matter sometimes referred to as "seeds", or "strings", or "slugs" are formed in many instances as a result of an agglomeration of the paint constituents during standing or recirculation of the liquid paint necessi-tating removal prior to discharge through the spray nozzle. The foregoing problem is particularly pro-nounced in recirculating-type liquid paint systems which are in widespread commercial use for keeping heavily-bodied pigments uniformly suspended in the liquid paint thereby assuring uniformity in the color and quality of the paint film applied to an article being painted. Such recirculating paint systems usually comprise a mixing tank equipped with suitable agitation for maintaining the paint uniformly mixed and a pump for transferring the liquid paint under a desired pressure to an automatic or manual spray nozzle in an amount in excess of that required which is re-turned through a suitable r~turn conduit to the mixing tank. In spite of the provision of suitable ~ilters in the recirculating supply line, the accumulation of foreiyn particulate matter occurs resulting in objec-tionable spray patterns.
The foregoing problem is also encountered during the spray application of paints supplied from a suction tank or cup directly connected to the spray gun. In recognition of this problem, a variety of filter devices have heretofore been proposed or used in liquid paint supply systems which are adapted to be connected at a point in close proximity to the spray nozzle effecting a fin~l filtration just prior to entry of the spray assembly. Prior art filter assemblies of the types heretofoxe known are generally characterized by their relatively large size and associated weight, by their multiple component construction increasing the complexity and cost of the assembly as well as diffi-culty during cleaning and replacement of the filter cartridges, and their relatively large volume requiring increased time to effect a purging of the internal volume thereof such as occasioned when changing paint colors in a multiple-color recirculating paint supply system. Such prior art filter assemblies because of their size and weight have not received widespread commercial acceptance in hand-held paint spray systems due to the awkwardness of the resulting assembly.
t~
The present invention overcomes many of the problems and disadvantages associated with prior art filter assemblies by providiny a compact, simple, light-weight and highly efficient inline filter assembly which is versatile in use and can be installed at any one of a variety of locations in a liquid paint supply system. The compact and simple construction of the filt~r assembly enables attachment directly to a hand-held spray gun without materially increasing the weight of the assembly as well as to automatic spray equip-ment. The simplicity and efficiency of the filter assembly facilitates periodic cleaning of the filter-ing element thereof and provides for a 19w cost simple and efficient assembly.
SUMMARY OF THE INVENTION
The benefits and advantages of the present invention are achieved by an inline filter assembly which comprises an integral tubular body member formed with a through-bore having an annular tapered shoulder intermediate of the upstream and downstream ends there-of. The downs~ream end of the body member is formed with an internal thread extending inwardly of the bore toward the tapered shoulder for ~hreadably receiving a male connection formed with a conically tapered seat adjacent to the end thereof. A removable filter element is disposed within the body member and comprises an ~Z;~70il annular ferrule formed with a first annular conic 1 seat adapted to be disposed in seated sealing relationship on the tapered shoulder within the body member and a sec-ond annular conical seat adapted to be disposed in seated sealing relationship on the conically tapered seat of the male connection to which the body member is attached.
A thimble-shaped filter screen of an integral construc-tion is affixed to the ferrule adjacent to the first conical seat and projects axially within the bore toward the upstream end thereo for receiving and fil-tering a supply of liquid paint entering the upstream end of the body member. The upstream end portion of the filter assembly is provided with suita~le connect-ing means such as an external thread for removably connecting the filter assembly to a paint supply sys-temO
Additional benefits and advantages of the pxesent invention will become apparent upon a reading of the Description of the Preferred Embodiments taken in conjunction with the accompanying drawing.
BRIEF DESCRIPTION OF THE DRAWING
Figure l is a side elevational view, partly schematic, of a typical air atomizing type spray gun incorporating a filter assembly of the present inven-tion connected through a quick-disconnect connection to a pressurized liquid paint supply system;
7~
Figure 2 is an enlarged transverse sectional view o the filter assembly connected to the inlet of the spray gun as shown in Figure l;
Figure 3 is a side elevational view of the removable filter element of the filtex assembly shown in Figure 2;
Figure 4 is an end ~iew of the filter element as shown in Figure 3; and Figure 5 is a side elevational view of the tubular body member of the filter assembly.
DESCRIPTION OF THE PREFERRED EM~ODIMENTS
Referring now in detail to the drawings, and as may be best seen in Figure 1, a spray gun 10 of the conventional air atomization type is shown including a hand grip 12 having the butt end thereof connected to an air hose 14 for supplying pressurized atomizing air to the spray nozzle. The spray gun is further provided with a pivotally mounted trigger 16 for con-trolling the discharge of an air atomized spray of paint from a mixing nozzle 18 at the forward end there-of. The internal structural arrangements of the spray gun 10 can be of any of the types well-known and com-mercially available including airless type spray equip-ment as well as manual and automatic spray equipment.
In the specific arrangement as illus~rated in Figure 1, a supply of pressurized liquid paint 70~.
enters the gun through a threaded coupling 20 which in turn is secured to the filter assembly 22 of the present invention which in turn is connected to a coupling 24 having a quick-disconnect stem secured thereto and removably engaged by a quick~disconnect fitting 26 connected to a flexible paint supply tube 28. This arrangement is typical of a recirculating paint flow control system which advantageously can further incorporate a flow control device of the gen-iO eral type as described in U.S. Patent No. 4,106,699.
While only one filter assembly 22 is employed in the arrangement of ~igure 1, a second filter assembly can advantageously be employed in the paint supply line located at the inlet side of the quick-disconnect coupling 26 to provide an initial fil~ering action followed by a final filtering action by the assembly 22. This latter arrangement is particularly desirable in a multiple color paint supply system whereby the spray gun lO is disconnected from one color paint supply source and connected to a second pressurized paint supply source having a different color paint. Under such cir-cumstances, it will be appreciated that the internal volume of the inline filter assembly 22 is important in minimizing purging of the prior paint color thereby saving time ~nd also reducing wastage of paint prior to resumption of the painting operation.
7~
It is also contemplated that in lieu of a remote supply of pressurized liqui~ paint, the ~ilter assembly 22 can be interposed in the position as shown between a conventional suction-type paint cup directly connected to the spray gun and portable therewith as in the case of paint applications involving smaller areas such in automobile body repair centers.
Referring now to Figures 2~5 of the drawing, the filter assembly 22 comprises an integral tubular body member 30 formed with a threaded counter-bore 32 in the downstream section thereof disposed in communi-cation with a smooth bore 34 in the upstream section thereof and defining at their intersection an annular tapered shoulder 36 against which a filter element 38 is adapted to be removably seated and in axial align-ment relative to the bore 34. The downstream end of the body member 30 is preferably provided with flats 40 disposed in a hexagonal arrangement as shown in Figure 5 for engagement by a wrench. The upstream section of the body member 30 is preferably provided with an external threaded section 42 for attachment of the filter assembly to the paint supply conduit such as the quick-disconnect coupling 24 as shown in Figure 1.
The filter element 38 as best seen in Figures
2-4 comprises a tubular annular ferrule 44 formed with a first annular conical seat 46 and a second annular 2~
conical seat 48. The first conical seat 46 i~ prefer-ably oriented at an angle of about 30 degrees from a plane disposed perpendicular to the axis of the filter element whereas the second conical seat 48 is prefer-ably disposed at an angle of about 45 degrees from a plane perpendicular to the axis of the filter element and consistent with conventional taper~ on tube fittings in accordance with national standards. The ferrule 44 is provided with an axially extending through-bore 50 and a tubular projection 52 extending axially of the first conical seat 46. An integral thimble-shaped filter screen 54 is disposed with the downstream end thereof in overlying supported relationship around the tubular projection 52 and is suitably affixed thereto such as by bra~ing or welding. The filter screen 54 in accordance with the arrangement illustrated in Fig-ures 2 and 3 comprises a circular cylindrical section integrally connected to a substantially hemispherical end section which is disposed in the path of the in-coming liquid paint providing for a self-cleaning action with the particulate matter moving axially along the annular space indicated at 55 in Figure 2 toward the ferrule of the filter element. The periphery of the cylindxical section of the filter screen is preferably spaced inwardly of the surface of the smooth bore 34 a distance of about 0.050 inch providing a volume for collection of the foreign particulate matter in the 7~
paint.
The body member 30, the ferrule 44 and the filter screen 54 are preferably composed of a corrosion resistant metal such as stainlese steel, for example, and the filter screen itself may be of about 100 to about 160 mesh size depending on the filtering charac-teristics desired.
In ~he assembled condition as illustrated in Figure 2, the first conical seat 46 is disposed in seated relationship against the tapered shoulder 36 of the body member which effects a centering of the filter element and a sealing of the ferrule to the body member avoiding any paint bypass. The clamped relationship of the filter element within the body member is achieved by the coaction of a threaded male member 56 such as on the coupling 20 formed with a conically tapered seat 58 at the end thereof which is adapted to seatably en-gage the second conical seat of the ferrule retaining the filter element in clamped relationship therebetween.
The simplicity and compact nature ~f the filter assembly as hereinabo~e described and as illus-trated in the drawing, provides for wide latitude and versatility in the installation thereof at one or more locations in a liquid paint supply system. Additionally, ~5 a cleaning of the filter screen of the filter a sembly can readily be achieved by simply disconnecting the tubular body member from ~he adjacent coupling enabling _g_ 7~.
a removal of the filter element and a cleaning or re-placement thereof as may be desired or required.
Operation down time is thereby minimized.
While it will be apparent that the preferred embodiments of the invention disclosed are well calcu-lated to fulfill the objects above stated, it will be appreciated that the inven~ion is susceptible to modi-fication, variation and change without departing from the proper scope or fair meaning of the subjoined claims.
conical seat 48. The first conical seat 46 i~ prefer-ably oriented at an angle of about 30 degrees from a plane disposed perpendicular to the axis of the filter element whereas the second conical seat 48 is prefer-ably disposed at an angle of about 45 degrees from a plane perpendicular to the axis of the filter element and consistent with conventional taper~ on tube fittings in accordance with national standards. The ferrule 44 is provided with an axially extending through-bore 50 and a tubular projection 52 extending axially of the first conical seat 46. An integral thimble-shaped filter screen 54 is disposed with the downstream end thereof in overlying supported relationship around the tubular projection 52 and is suitably affixed thereto such as by bra~ing or welding. The filter screen 54 in accordance with the arrangement illustrated in Fig-ures 2 and 3 comprises a circular cylindrical section integrally connected to a substantially hemispherical end section which is disposed in the path of the in-coming liquid paint providing for a self-cleaning action with the particulate matter moving axially along the annular space indicated at 55 in Figure 2 toward the ferrule of the filter element. The periphery of the cylindxical section of the filter screen is preferably spaced inwardly of the surface of the smooth bore 34 a distance of about 0.050 inch providing a volume for collection of the foreign particulate matter in the 7~
paint.
The body member 30, the ferrule 44 and the filter screen 54 are preferably composed of a corrosion resistant metal such as stainlese steel, for example, and the filter screen itself may be of about 100 to about 160 mesh size depending on the filtering charac-teristics desired.
In ~he assembled condition as illustrated in Figure 2, the first conical seat 46 is disposed in seated relationship against the tapered shoulder 36 of the body member which effects a centering of the filter element and a sealing of the ferrule to the body member avoiding any paint bypass. The clamped relationship of the filter element within the body member is achieved by the coaction of a threaded male member 56 such as on the coupling 20 formed with a conically tapered seat 58 at the end thereof which is adapted to seatably en-gage the second conical seat of the ferrule retaining the filter element in clamped relationship therebetween.
The simplicity and compact nature ~f the filter assembly as hereinabo~e described and as illus-trated in the drawing, provides for wide latitude and versatility in the installation thereof at one or more locations in a liquid paint supply system. Additionally, ~5 a cleaning of the filter screen of the filter a sembly can readily be achieved by simply disconnecting the tubular body member from ~he adjacent coupling enabling _g_ 7~.
a removal of the filter element and a cleaning or re-placement thereof as may be desired or required.
Operation down time is thereby minimized.
While it will be apparent that the preferred embodiments of the invention disclosed are well calcu-lated to fulfill the objects above stated, it will be appreciated that the inven~ion is susceptible to modi-fication, variation and change without departing from the proper scope or fair meaning of the subjoined claims.
Claims (6)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An inline filter assembly adapted for use in a paint spray supply system comprising an integral tubular body member formed with a through-bore having an annular tapered shoulder intermediate the upstream and downstream ends thereof, said body member formed with an internal thread in the downstream portion of said bore extending inwardly toward said tapered shoulder for threadably receiving a threaded male connection formed with a conically tapered seat at the end thereof, a removable filter element com-prising an annular ferrule formed with a first annular conical seat adapted to be disposed in seated sealing relation-ship on said tapered shoulder and a second annular conical seat adapted to be disposed in seated sealing relation-ship on the conically tapered seat of the male connec-tion and removably clamped therebetween, a thimble-shaped filter screen affixed to said ferrule adjacent to said first conical seat and projecting axially within said bore toward said upstream end, and means on the upstream end portion of said body member for connecting said filter assembly to a paint supply system.
2. The filter assembly as defined in claim 1 wherein said tapered shoulder and said first annular conical seat are disposed at an angle of about 30 degrees from a plane perpendicular to the axes thereof.
3. The filter assembly as defined in claim 1 wherein said second annular conical seat is disposed at an angle of about 45 degrees from a plane perpen-dicular to the axis thereof.
4. The filter assembly as defined in claim 1 in which said ferrule further includes a tubular projection extending axially of said first annular conical seat for supporting said filter screen in overlying relationship therearound.
5. The filter assembly as defined in claim 1 in which said filter screen is of an integral wire mesh including a circular cylindrical portion integ-rally connected at its upstream end to a substantially hemispherical section.
6. The filter assembly as defined in claim 4 further including bonding means fox securing said filter screen to said tubular projection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000442639A CA1222701A (en) | 1983-12-06 | 1983-12-06 | Filter assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000442639A CA1222701A (en) | 1983-12-06 | 1983-12-06 | Filter assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1222701A true CA1222701A (en) | 1987-06-09 |
Family
ID=4126676
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000442639A Expired CA1222701A (en) | 1983-12-06 | 1983-12-06 | Filter assembly |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1222701A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6572029B1 (en) | 1993-12-02 | 2003-06-03 | Illinois Tool Works Inc. | Recirculating paint system having an improved push to connect fluid coupling assembly |
-
1983
- 1983-12-06 CA CA000442639A patent/CA1222701A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6572029B1 (en) | 1993-12-02 | 2003-06-03 | Illinois Tool Works Inc. | Recirculating paint system having an improved push to connect fluid coupling assembly |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |