CA1162456A - Filter cartridge assembly - Google Patents
Filter cartridge assemblyInfo
- Publication number
- CA1162456A CA1162456A CA000382321A CA382321A CA1162456A CA 1162456 A CA1162456 A CA 1162456A CA 000382321 A CA000382321 A CA 000382321A CA 382321 A CA382321 A CA 382321A CA 1162456 A CA1162456 A CA 1162456A
- Authority
- CA
- Canada
- Prior art keywords
- sleeve
- core member
- filter cartridge
- restricted
- smoke
- 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
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- Cigarettes, Filters, And Manufacturing Of Filters (AREA)
Abstract
FILTER CARTRIDGE ASSEMBLY
ABSTRACT
A filter cartridge assembly for filtering tars from tobacco smoke is described, said assembly comprising a cylindrical sleeve and an inner filter core member, the inner surface of the cylindrical sleeve and the outer surface of the core member defining a smoke passageway. One end of the sleeve is formed with an obstruction having a restricted inlet passage therethrough, the other end being essentially open for receiving the filter core member therein. A
pair of stand-off contacts is provided on one end of the core member, said contracts projecting from an impingement surface, and a cylinder-cal plug having a restricted outlet passage is formed on the opposite end. When the core member is assembled within the sleeve, the plug end thereof is positioned in sealing relation to the open end of the sleeve and supports the filter core member therefrom. The cross sectional area of the restricted outlet passage is carefully selected to control both the flow of smoke through the assembly and the level of filtration.
ABSTRACT
A filter cartridge assembly for filtering tars from tobacco smoke is described, said assembly comprising a cylindrical sleeve and an inner filter core member, the inner surface of the cylindrical sleeve and the outer surface of the core member defining a smoke passageway. One end of the sleeve is formed with an obstruction having a restricted inlet passage therethrough, the other end being essentially open for receiving the filter core member therein. A
pair of stand-off contacts is provided on one end of the core member, said contracts projecting from an impingement surface, and a cylinder-cal plug having a restricted outlet passage is formed on the opposite end. When the core member is assembled within the sleeve, the plug end thereof is positioned in sealing relation to the open end of the sleeve and supports the filter core member therefrom. The cross sectional area of the restricted outlet passage is carefully selected to control both the flow of smoke through the assembly and the level of filtration.
Description
- J162~5~
FILTER CARTRIDGE ASSEMBLY
_______________ _____ The present inventlon relates generally to fllter1ng apparatus and more parttcularly to fllter cartrldges wh1ch utlllze 5 a venturl to accelerate smoke vapors and an Implngsment barrler against whlch the vapors are dtrected, the heavler vapors (such as tars~ belng separated from lighter vapors. Thls prlnclple of flltratlon is known in the art.
The present 1nventlon dlffsrs from oth0r known prior art devlces In provldlng a unlque arrangement of parts for con-structlng a flltering cartrldge ass~mbly that may be commer1eally produced both economlcally and wlth sufflclent accuracy to ensure a hlgh deyree of flltratlon or~ alternatlvsly~ to control taste.
In partlcular, the present Invantlon provtdes a fll~er cartrldge assembly for filterlng tars from tobacco smoke com-prlslng: a cyllndrlcal sleeve having an Integral obstructlon form~d at one end, a coaxlal restr1cted Inlet passage extendlng through sald obstructlon; and a fllter core member recetved wlth-in sald sleeve, sald core member belng formed wlth a central body ~ portlon Includlng an annular enlarg~ment, a stand-off contact pro-Jectlng from an Implngement surface at ons end, and a cyllndrlcal plug having a restricted outlet passaga at the other end, the cen-tral body portlon of sald core member and Inner surfac~ of sald sleeve definlng a smoke passageway between the res~rlcted Inlet passage and the cyiIndrlcal plug, a transverse passage belng fonmed through the central body portlon of sald core member com-munlcattng the restricted outlet passage wlth the Intorior of sald sleeve on the downstream slde of sald annular enlarg~ment~ sald stand-off contact engaglng the obstructlon wlthin sald sleeve and spaclng the Implngement surface of sald core In predatenmlned spaced relatlon to the openlng of sald restrlcted Inlet passage, sa1d cyllndrlcal plug be7ng recelved wlth the sleeve In ssallng relatlon thereto and supportlng sald fllter core member therefrQm, the crDss sectlonal area of the restrlcted outlet passage belng smaller than the area between the Inner surface of sald cyllndr1cal sleeve and the annular enlargement of sald core member and selected to control the qualIty of flltratlon.
Varlous other objects of thls Inventlon wlll become appar-ent In vlew of the followlng deta11ed descrlptlon.
In the drawlngs formlng a part of th1s appllcatlon and In ~ ~ 6~5~
whlch llke parts are Identifie~ by llke reference nu~erals through-out the same, FIG. i is an exploded vlew of a fllter cartrldge assembly and a holder for satd cartrtdge;
FIG. 2 'Is a 7Ongttudlnal section of the fllter cartrldg0 assembly and a portton o~ the holder In assembled conditlon;
FIG. 3 Is an end vlew of the inner core member of the filter cartrldge assembly as vlewed on llne 3-3 of FIG. I; and FIG. 4 Is a longltudlnal ssctton of a second ~mbodlment of the inventlon Illustratlng a fllter cartrTdge assembly for use as an Integral part of a clgarette.
ReferrTng to FIGS. 1~ 2 and'3, there Is shown a prQfsrred embodlment of a fllter cartrldge assembly 10 comprls!ng a cylln-drlcal sleeve 11 and a fllter core member 12. Cartrldge assem-bly 10 Is adapted to be recelv0d wlthln a three-part holder as~em-bly conslstlng of a mouth plece 13, a cigarette holder 14, and a spacer rlng 15.
Cyllndrlcal sleeve 12 Is form0d with an obstructlon 12a at one end9 the other end belng essentlally open and adapted for recelvlng a fllter core member 11 therethrough. A restrlcted venturl-type Inlet passage 16 Ts formed through obstruction 12a coaxlally of the sleeve. The slze of passage 16 fs restr7cted to Increase veloclty of smoke drawn from a clgarette mounted In the recess 14a o,f clgarette holder 14. The diameter of passage 16 Is Indlcated by the letter dl, a value whlch may be the same as or cons!stent wlth pr'lor art fllter constructlons. In a pre-farred constructlon dl, may have a dlmenslon .029 Inches (or .737 mm.) glvlng a cross se~tlonal area o~ .00066 sguare Inches (or .426 square mm.).
Core member 11 Is dlmenslonaliy formed to be rscelved wlthln sleeve 12, a palr of stand-off contacts 17 and 18 belng symetrlcally formed and projectlng from an Implngement surface 19 at one end. Contacts 17 and 18 enga~e the Inner surfæe of obstructlon 12a and spare the Implngement surface 19 a dlstance d~ therefrom. tA preferred dlstance d2 Is .029 Inches or .737 mm). It wlll be noted also that stand-off contacts 17 ~nd 78 are symetrlcally a~ranged en opposlte sides of the Inlet passage i6 allowing the smoke stream whlch enters therethrough to tmplnge agalnst surface 19 and m~ve around and to both sides of fltter 1 ~1 6245B
core member 11. A conlcal recess 20 Is formed in obstructlon i2a of sleeve 12 to produce turbulence In the flow of smoke perlpherally of the ;mpTngement sur~ace 19. The e~fect o~ thls turbulence, combined wtth the hlgh veloclty Implngement of the .S smoke stream agalnst surface 19, serves to separate the heavler tar vapors and cause such tar vapors to become deposlted on the adjacent surfaces of the core member and sleeve.
The central body portlon of core member 11 Is of re-duced cross section belng conlcally tapered In the reglon 21 IO toward a cyllndrlcal center portlon 22. However, an annular enlargenent 23 provldes a dam that restrlcts the flow of smoke throuqh the fllter assembly between sleeve 12 and core 11. The dlameter of the annular enlargement is shown as d3, and thls dlmenslon bears a relatlonship to the Inslde dlameter of sleeve 15 12, whlch Is Indlcated by refererce d4~ to control the flow of smoke and reta!n tar partlcles wlthln the assembly.
A transverse passage 24 communicates the Interlor of sleeve 12 on the downstream slde of anlarg~ment 23 wlth a restrlcted outlet passage 25 fonmed through a cyllndrlcal plug lla, whtch also forms an Integral part of the core member. Plug lla seaiingly engages the Inner surface and ond of sleeve 12, thus preventlng a bypass of smoke and requlrlng the smoke to be wlthdrawn through transverse passage 24 and restrlcted outlet passage 25.
The dtameter d5 of restrlcted outlet passage 25 Is sub-stantlally greater than the diameter dl of restrlcted Inlet passage 16. But passage 25 is also chosen or "sTzed" to regulate flltra-tlon and taste quallty. More partlcularly, It has been found that for best flltratlon the cross sectlonal area of outlet passage 25 must be smaller than the passageway between the Inner cylindrlcal surface of sleeve 12 and the annular enlargement 23 of core member I I .
Thls Inventlon further contemplates, however, that core m~mbar 11 be formed wlth restrlcted outlet passages of varlous sizes.
The particular slze of the outlet passage determlnes tha effect-lveness of flltratlon wlthout substantlally varylng the suctlon force requlred tv smoke a clgarette. In that regard, the suctton forca requlred Is controlled by the most restrlcted passage whlch, tn con-ncctlon wlth the present Inventlon, ts venturi Inlet passage 16.
~ ~2~
It has been found that Increaslng the slze of outlet passage 25 to a cross sectlonal area greater than that between the annular enlargffment 23 and the inner surface of sleeve 12 results Tn a substantlal change In filtration of the fllter cartrldge assembly. Thls Is best shown by asslgntng exemplary dlmenslonal values to dtmenslons d3 and d4 and varylng the slze of outiet passage 25. If the dlmenslon d3 and d4 are 5~59 and 5.~9 mm, respectlvely, thsn the flow area between sleeve 12 and enlargemen~ 23 wlll'be 2.705 square mm. It has b~en determlned that uslng a dlameter d5 of 1.676 mm.
(whlch provldes a cross sectlonal flow area of 2.206 square mm.) glves the vsry best flltratlon. However, Increaslng the dimenslon d5 to 1.930 mm. (and a cross secttonal area of 2.925 squarc mm.) glves only good flltratlon, and a dlmenston of 2.184 mm, (and a cross sectlonal area of 3.746 square mm.) ylelds very poor flltratlon.
A comparison of the cross sectlonal area through tha restrlcted outlet passage 25 for each of the three examples demonstrates the Importance of utlllzlng a restrlct~d outlet passage whlch ts smaller In area than the cross sectlonal area be~ween the Inner surface of sleeve 12 and the annular enlarge-ment 23 for best flltratTon. HDwever~ it may be of commerclal valuc to Intentlonally make filter assemblles havlng a poorer flltratlon qualTty to control ~Itaste~. Th1s is accompllshed wtth the present Inventton by merely enlarglny passage 25 to a cross sectlonal area equal or greater than the area between sleeve 12 and enlargement 23.
The three-plece holder shown Is untquely construc-ted to recelve fllter assembly tO. The end of mouth plece 13 Is ~ormed wlth a thread 13a that threadably engages wlth a groDve 14b formed In the end of receptacle 14. A perlpheral recess 13b Is provlded adjacent to thread 13a for receivlng spacer rlng 15. Thls rlng provldes a Itmlt to the threadlng engagement wIth receptacle 14, posltlons the receptacle rela-tlve to the mouth plece for proper retentlon'of the fllter cart-rldge assembly 10 and Insures proper sealing. Rlng 15 may also be usad to Indlcate the ffltratlon capabllity of the cartrldge assembly belng used. This can be done by color codlng the ring and supplylng a new rlng wlth each fllter cartrldge ass~mbly.
~ ~ ~2~
FIG. 4 of the drawlng Illustrates a second embodlment of a fliter cartrtdge assembly su7table for use as an 7ntegral part of a c1garette~ The f71ter assembly comprlses a core member 30 and a sleeve 31 mounted to a clgarette 32 by an encapsulatlng sklrt or band 33. Core member 30 and sleeve 31 are formed with all of the sam~ structural features described in connectlon wtth the fllter assembly IO of FIGS I through 3. However, the body portlon of core member 30 Is substantlally shorter in length than core membar 11 sTnce only a small amount of tars can be r~moved fro~ a slngle clgarette. It wlll be noted that the d7menston dl of venturi Inlet passage 34 and ~he stand-off dlstance d2 may be the same as the fTrst embodlment. But wtth the use of a smal7er fllter assembly the Internal clrcumference of sleeve 30 and the outer perlphery of the core enlarge~ent of dam 35 may be made to '5 smaller dlmenslons. Notwlthstandlng, tt Is essential for best ftltration that the restrlcted outlet passage 36 be smaller than the area between the Inner surface of the sleeve and the annular enlargement. As an example, the diameter of the outlet passage may be 1.397 mm. (resultlng In a cross sectlonal area of 1.516 square mm.) compared wtth a throat area between the Inner surface o~ sleeve 31 and the outer surface of enlargement 35 of 2.452 square mm. (where the dlameter dlmenslons deflnlng that throat are 5.309 mm. and 5.004 mm. respectlvely).
The essenttal dlfference between the fllter assembiy of FIG. 4 and that shown ln FIGS. I through 3, is that tha open end o~ sleeve 31 provldes a recess 31a for receivlng the cyllndrlcal plug end of fllter core 30 In recessed relatlon to the end of the sleeve. This allows the fllter assembly to be used without a separate mouth plece as provlded In connectlon wlth the flrst em-bodIment.
Although preferred embodlments of the Inventlon havebeen Illustrated and descrlbed, varlous modlflcatlons and changes may be resortad to wlthout departlng from the splrit of the In-ventlon of the scope of the appended clalms~ and each of such mod-}5 Iflcatlons and changes Is contemplated.
FILTER CARTRIDGE ASSEMBLY
_______________ _____ The present inventlon relates generally to fllter1ng apparatus and more parttcularly to fllter cartrldges wh1ch utlllze 5 a venturl to accelerate smoke vapors and an Implngsment barrler against whlch the vapors are dtrected, the heavler vapors (such as tars~ belng separated from lighter vapors. Thls prlnclple of flltratlon is known in the art.
The present 1nventlon dlffsrs from oth0r known prior art devlces In provldlng a unlque arrangement of parts for con-structlng a flltering cartrldge ass~mbly that may be commer1eally produced both economlcally and wlth sufflclent accuracy to ensure a hlgh deyree of flltratlon or~ alternatlvsly~ to control taste.
In partlcular, the present Invantlon provtdes a fll~er cartrldge assembly for filterlng tars from tobacco smoke com-prlslng: a cyllndrlcal sleeve having an Integral obstructlon form~d at one end, a coaxlal restr1cted Inlet passage extendlng through sald obstructlon; and a fllter core member recetved wlth-in sald sleeve, sald core member belng formed wlth a central body ~ portlon Includlng an annular enlarg~ment, a stand-off contact pro-Jectlng from an Implngement surface at ons end, and a cyllndrlcal plug having a restricted outlet passaga at the other end, the cen-tral body portlon of sald core member and Inner surfac~ of sald sleeve definlng a smoke passageway between the res~rlcted Inlet passage and the cyiIndrlcal plug, a transverse passage belng fonmed through the central body portlon of sald core member com-munlcattng the restricted outlet passage wlth the Intorior of sald sleeve on the downstream slde of sald annular enlarg~ment~ sald stand-off contact engaglng the obstructlon wlthin sald sleeve and spaclng the Implngement surface of sald core In predatenmlned spaced relatlon to the openlng of sald restrlcted Inlet passage, sa1d cyllndrlcal plug be7ng recelved wlth the sleeve In ssallng relatlon thereto and supportlng sald fllter core member therefrQm, the crDss sectlonal area of the restrlcted outlet passage belng smaller than the area between the Inner surface of sald cyllndr1cal sleeve and the annular enlargement of sald core member and selected to control the qualIty of flltratlon.
Varlous other objects of thls Inventlon wlll become appar-ent In vlew of the followlng deta11ed descrlptlon.
In the drawlngs formlng a part of th1s appllcatlon and In ~ ~ 6~5~
whlch llke parts are Identifie~ by llke reference nu~erals through-out the same, FIG. i is an exploded vlew of a fllter cartrldge assembly and a holder for satd cartrtdge;
FIG. 2 'Is a 7Ongttudlnal section of the fllter cartrldg0 assembly and a portton o~ the holder In assembled conditlon;
FIG. 3 Is an end vlew of the inner core member of the filter cartrldge assembly as vlewed on llne 3-3 of FIG. I; and FIG. 4 Is a longltudlnal ssctton of a second ~mbodlment of the inventlon Illustratlng a fllter cartrTdge assembly for use as an Integral part of a clgarette.
ReferrTng to FIGS. 1~ 2 and'3, there Is shown a prQfsrred embodlment of a fllter cartrldge assembly 10 comprls!ng a cylln-drlcal sleeve 11 and a fllter core member 12. Cartrldge assem-bly 10 Is adapted to be recelv0d wlthln a three-part holder as~em-bly conslstlng of a mouth plece 13, a cigarette holder 14, and a spacer rlng 15.
Cyllndrlcal sleeve 12 Is form0d with an obstructlon 12a at one end9 the other end belng essentlally open and adapted for recelvlng a fllter core member 11 therethrough. A restrlcted venturl-type Inlet passage 16 Ts formed through obstruction 12a coaxlally of the sleeve. The slze of passage 16 fs restr7cted to Increase veloclty of smoke drawn from a clgarette mounted In the recess 14a o,f clgarette holder 14. The diameter of passage 16 Is Indlcated by the letter dl, a value whlch may be the same as or cons!stent wlth pr'lor art fllter constructlons. In a pre-farred constructlon dl, may have a dlmenslon .029 Inches (or .737 mm.) glvlng a cross se~tlonal area o~ .00066 sguare Inches (or .426 square mm.).
Core member 11 Is dlmenslonaliy formed to be rscelved wlthln sleeve 12, a palr of stand-off contacts 17 and 18 belng symetrlcally formed and projectlng from an Implngement surface 19 at one end. Contacts 17 and 18 enga~e the Inner surfæe of obstructlon 12a and spare the Implngement surface 19 a dlstance d~ therefrom. tA preferred dlstance d2 Is .029 Inches or .737 mm). It wlll be noted also that stand-off contacts 17 ~nd 78 are symetrlcally a~ranged en opposlte sides of the Inlet passage i6 allowing the smoke stream whlch enters therethrough to tmplnge agalnst surface 19 and m~ve around and to both sides of fltter 1 ~1 6245B
core member 11. A conlcal recess 20 Is formed in obstructlon i2a of sleeve 12 to produce turbulence In the flow of smoke perlpherally of the ;mpTngement sur~ace 19. The e~fect o~ thls turbulence, combined wtth the hlgh veloclty Implngement of the .S smoke stream agalnst surface 19, serves to separate the heavler tar vapors and cause such tar vapors to become deposlted on the adjacent surfaces of the core member and sleeve.
The central body portlon of core member 11 Is of re-duced cross section belng conlcally tapered In the reglon 21 IO toward a cyllndrlcal center portlon 22. However, an annular enlargenent 23 provldes a dam that restrlcts the flow of smoke throuqh the fllter assembly between sleeve 12 and core 11. The dlameter of the annular enlargement is shown as d3, and thls dlmenslon bears a relatlonship to the Inslde dlameter of sleeve 15 12, whlch Is Indlcated by refererce d4~ to control the flow of smoke and reta!n tar partlcles wlthln the assembly.
A transverse passage 24 communicates the Interlor of sleeve 12 on the downstream slde of anlarg~ment 23 wlth a restrlcted outlet passage 25 fonmed through a cyllndrlcal plug lla, whtch also forms an Integral part of the core member. Plug lla seaiingly engages the Inner surface and ond of sleeve 12, thus preventlng a bypass of smoke and requlrlng the smoke to be wlthdrawn through transverse passage 24 and restrlcted outlet passage 25.
The dtameter d5 of restrlcted outlet passage 25 Is sub-stantlally greater than the diameter dl of restrlcted Inlet passage 16. But passage 25 is also chosen or "sTzed" to regulate flltra-tlon and taste quallty. More partlcularly, It has been found that for best flltratlon the cross sectlonal area of outlet passage 25 must be smaller than the passageway between the Inner cylindrlcal surface of sleeve 12 and the annular enlargement 23 of core member I I .
Thls Inventlon further contemplates, however, that core m~mbar 11 be formed wlth restrlcted outlet passages of varlous sizes.
The particular slze of the outlet passage determlnes tha effect-lveness of flltratlon wlthout substantlally varylng the suctlon force requlred tv smoke a clgarette. In that regard, the suctton forca requlred Is controlled by the most restrlcted passage whlch, tn con-ncctlon wlth the present Inventlon, ts venturi Inlet passage 16.
~ ~2~
It has been found that Increaslng the slze of outlet passage 25 to a cross sectlonal area greater than that between the annular enlargffment 23 and the inner surface of sleeve 12 results Tn a substantlal change In filtration of the fllter cartrldge assembly. Thls Is best shown by asslgntng exemplary dlmenslonal values to dtmenslons d3 and d4 and varylng the slze of outiet passage 25. If the dlmenslon d3 and d4 are 5~59 and 5.~9 mm, respectlvely, thsn the flow area between sleeve 12 and enlargemen~ 23 wlll'be 2.705 square mm. It has b~en determlned that uslng a dlameter d5 of 1.676 mm.
(whlch provldes a cross sectlonal flow area of 2.206 square mm.) glves the vsry best flltratlon. However, Increaslng the dimenslon d5 to 1.930 mm. (and a cross secttonal area of 2.925 squarc mm.) glves only good flltratlon, and a dlmenston of 2.184 mm, (and a cross sectlonal area of 3.746 square mm.) ylelds very poor flltratlon.
A comparison of the cross sectlonal area through tha restrlcted outlet passage 25 for each of the three examples demonstrates the Importance of utlllzlng a restrlct~d outlet passage whlch ts smaller In area than the cross sectlonal area be~ween the Inner surface of sleeve 12 and the annular enlarge-ment 23 for best flltratTon. HDwever~ it may be of commerclal valuc to Intentlonally make filter assemblles havlng a poorer flltratlon qualTty to control ~Itaste~. Th1s is accompllshed wtth the present Inventton by merely enlarglny passage 25 to a cross sectlonal area equal or greater than the area between sleeve 12 and enlargement 23.
The three-plece holder shown Is untquely construc-ted to recelve fllter assembly tO. The end of mouth plece 13 Is ~ormed wlth a thread 13a that threadably engages wlth a groDve 14b formed In the end of receptacle 14. A perlpheral recess 13b Is provlded adjacent to thread 13a for receivlng spacer rlng 15. Thls rlng provldes a Itmlt to the threadlng engagement wIth receptacle 14, posltlons the receptacle rela-tlve to the mouth plece for proper retentlon'of the fllter cart-rldge assembly 10 and Insures proper sealing. Rlng 15 may also be usad to Indlcate the ffltratlon capabllity of the cartrldge assembly belng used. This can be done by color codlng the ring and supplylng a new rlng wlth each fllter cartrldge ass~mbly.
~ ~ ~2~
FIG. 4 of the drawlng Illustrates a second embodlment of a fliter cartrtdge assembly su7table for use as an 7ntegral part of a c1garette~ The f71ter assembly comprlses a core member 30 and a sleeve 31 mounted to a clgarette 32 by an encapsulatlng sklrt or band 33. Core member 30 and sleeve 31 are formed with all of the sam~ structural features described in connectlon wtth the fllter assembly IO of FIGS I through 3. However, the body portlon of core member 30 Is substantlally shorter in length than core membar 11 sTnce only a small amount of tars can be r~moved fro~ a slngle clgarette. It wlll be noted that the d7menston dl of venturi Inlet passage 34 and ~he stand-off dlstance d2 may be the same as the fTrst embodlment. But wtth the use of a smal7er fllter assembly the Internal clrcumference of sleeve 30 and the outer perlphery of the core enlarge~ent of dam 35 may be made to '5 smaller dlmenslons. Notwlthstandlng, tt Is essential for best ftltration that the restrlcted outlet passage 36 be smaller than the area between the Inner surface of the sleeve and the annular enlargement. As an example, the diameter of the outlet passage may be 1.397 mm. (resultlng In a cross sectlonal area of 1.516 square mm.) compared wtth a throat area between the Inner surface o~ sleeve 31 and the outer surface of enlargement 35 of 2.452 square mm. (where the dlameter dlmenslons deflnlng that throat are 5.309 mm. and 5.004 mm. respectlvely).
The essenttal dlfference between the fllter assembiy of FIG. 4 and that shown ln FIGS. I through 3, is that tha open end o~ sleeve 31 provldes a recess 31a for receivlng the cyllndrlcal plug end of fllter core 30 In recessed relatlon to the end of the sleeve. This allows the fllter assembly to be used without a separate mouth plece as provlded In connectlon wlth the flrst em-bodIment.
Although preferred embodlments of the Inventlon havebeen Illustrated and descrlbed, varlous modlflcatlons and changes may be resortad to wlthout departlng from the splrit of the In-ventlon of the scope of the appended clalms~ and each of such mod-}5 Iflcatlons and changes Is contemplated.
Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A filter cartridge assembly for filtering tars from tobacco smoke comprising: a cylindrical sleeve having an integral obstruction formed at one end, a coaxial restricted inlet passage extending through said obstruction; and a filter core member received within said sleeve, said core member being formed with a central body portion including an annular enlargement, a stand-off contact projecting from an impingement surface at one end, and a cylindrical plug having a restricted outlet passage at the other end, the central body portion of said core member and inner surface of said sleeve defining a smoke passageway between the restricted inlet passage and the cylindrical plug, a transverse passage being formed through the central body portion of said core member communicating the restricted outlet passage with the interior of said sleeve on the downstream side of said annular enlargement, said stand-off contact engaging the obstruction within said sleeve and spacing the impingement surface of said core in predetermined spaced relation to the opening of said restricted inlet passage, said cylindrical plug being received with the sleeve in sealing relation thereto and supporting said filter core member therefrom, the cross sectional area of the restricted outlet passage being smaller than the area between the inner surface of said cylindrical sleeve and the annular enlargement of said core member and selected to control the quality of filtration.
The filter cartridge assembly of Claim 1, including a conical recess being formed in the obstruction of said sleeve to produce turbulence in the flow of smoke peripherally of the impinge-ment surface.
3. The filter cartridge assembly of Claim 1 or 2, wherein the restricted outlet passage of said plug is at least three times greater than the restricted inlet passage through the obstruction of said cylindrical sleeve.
4. The filter cartridge assembly of Claim 1 or 2, including a holder for said filter cartridge, said holder comprising a cigarette receptacle and a mouthpiece threadably and coaxially connectable, said mouthpiece being formed with a peripheral recess, and a spacer ring mountable within the recess of said mouthpiece and engageable with the end said cigarette receptacle when connected to said mouthpiece, said spacer ring providing a limit to threading engagement, axially positioning the receptacle and mouthpiece for encapsulation and proper retention of said filter cartridge assem-bly and effecting a seal therewith.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000382321A CA1162456A (en) | 1981-07-23 | 1981-07-23 | Filter cartridge assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000382321A CA1162456A (en) | 1981-07-23 | 1981-07-23 | Filter cartridge assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1162456A true CA1162456A (en) | 1984-02-21 |
Family
ID=4120504
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000382321A Expired CA1162456A (en) | 1981-07-23 | 1981-07-23 | Filter cartridge assembly |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1162456A (en) |
-
1981
- 1981-07-23 CA CA000382321A patent/CA1162456A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |