US3779254A

US3779254A - Smoker{40 s pipe

Info

Publication number: US3779254A
Application number: US00218316A
Authority: US
Inventors: J Linskey
Original assignee: Individual
Current assignee: Individual
Priority date: 1972-01-17
Filing date: 1972-01-17
Publication date: 1973-12-18
Anticipated expiration: 1990-12-18

Abstract

An aluminum pipe stem has an air jet opening in the upper portion thereof adjacent a smoke passing orifice formed in the upper portion of the stem by a baffle blocking the lower portion of the stem, and turbulates and dilutes the smoke flowing through the orifice. The baffle forms the rear end of a front inserted pin which guides the smoke from the bowl downwardly to the bottom portion of the stem and then upwardly to the outlet orifice. A bit has an insert having two lands having a friction or interference fit within the stem with an annular groove between the lands to permit flow of material of the bit as the interference fit is effected.

Description

[ 1 Dec. 18, 1973 1 SMOKERS PIPE [76] Inventor: John R. Linskey, Rt. 1, Box 174,

Hillsboro, Oreg. 97123 22 Filed: Jan. 17, 1972 [21] Appl. No.: 218,316

Related US. Application Data [63] Continuation-in-part of Ser. No. 39,000, May 20,

1970, abandoned.

[52] US. Cl 131/198 R, 131/206, 131/210, 131/225 [51] Int. Cl. A24f 05/04 [58] Field of Search 131/194, 196, 198 R, 131/198 A, 205, 206, 223, 225, 227, 224, 210, 230

[56] References Cited UNITED STATES PATENTS 2,200,236 5/1940 Kirsten 131/201 2,230,872 2/1941 Turinsky 131/227 X 2,269,541 1/1942 MacDonald 131/201 X 3,460,544 8/1969 Doppelt 131/198 R 2,722,938 11/1955 Armitage l3l/l94 948,550 2/1910 Rheinauer 131/225 3,308,834 3/1967 Furedy 131/230 UX 1,426,656 8/1922 Laban 131/224 X 948,635 2/1910 Perry 131/210 FOREIGN PATENTS OR APPLICATIONS 111,365 l/1945 Sweden 131/225 228,214 l/1925 Great Britain... 11,777 1886 Great Britain 595,227 11/1947 Great Britain 131/198 R Primary Examiner-Joseph S. Reich Attorney-Stephen W. Blore et a1.

[57] ABSTRACT An aluminum pipe stem has an air jet opening in the upper portion thereof adjacent a smoke passing orifice formed in the upper portion of the stem by a baffle blocking the lower portion of the stem, and turbulates and dilutes the smoke flowing through the orifice. The baffle forms the rear end of a front inserted pin which guides the smoke from the bowl downwardly to the bottom portion of the stem and then upwardly to the outlet orifice. A bit has an insert having two lands having a friction or interference fit within the stem with an annular groove between the lands to permit flow of material of the bit as the interference fit is effected.

14 Claims, 11 Drawing Figures PAIENTEDUEC18 ma 3.779.254

JOHN R. LI NSKEY INVENTOR BUCKHORN, BLORE, KLARQUIST & SPARKMAN ATTORNEYS SMOKER'S PIPE CROSS-REFERENCE TO RELATED APPLICATION This application is a continuation-in-part of copending application Ser. No. 39,000, filed May 20, 1970, for Smokers Pipe, now abandoned.

DESCRIPTION This invention relates to improved smokers pipes and more particularly to improved pipe bit and grate pin constructions.

An object of the invention is to provide improved smokers pipes.

Another object of the invention is to provide improved pipe bit and grate constructions.

A further object of the invention is to provide a pipe having a grate pin causing smoke from a bowl to flow along the lower portion of a condensing stem, and then through an outlet orifice in the upper portion of the stem and to a bit.

Another object of the invention is to provide a pipe having a stern having an air jet opening in the upper portion of the stem just beyond an orifice in the upper portion of the stem to turbulate smoke flowing from the orifice to a bit.

A further object of the invention is to provide a pipe having a horizontal stem having an air jet inlet on the top thereof so as not to leak condensation and to permit closing by a finger of the user to increase draft when so desired.

Another object of the invention is to provide a pipe having a bit provided with annular lands separated by an annular groove and fitting with an friction or interference fit into a stern of the pipe.

Another object of the invention is to provide a grate pin having a plurality of disc-like baffles between a bowl and a bit.

In the drawings:

FIG. 1 is a fragmentary, longitudinal vertical sectional view of an improved smokers pipe forming one embodiment of the invention;

FIG. 2 is an enlarged, fragmentary, vertical sectional view taken along line 2--2 of FIG. 1;

FIG. 3 is an enlarged, fragmentary, vertical sectional view taken along line 33 of FIG. 1;

FIG. 4 is an enlarged, fragmentary, vertical sectional view taken along line 44 of FIG. 1;

FIG. 5 is an enlarged, vertical sectional view taken along line 5-5 of FIG. 1;

FIG. 6 is a fragmentary, vertical sectional view of an improved smokers pipe forming an alternate embodiment of the invention;

FIG. 7 is a vertical sectional view taken along line 7-7 of FIG. 6;

FIG. 8 is a fragmentary, vertical sectional view of an improved smokers pipe forming an alternate embodiment of the invention;

FIG. 9 is an enlarged, fragmentary, vertical sectional view taken along line 99 of FIG. 8;

FIG. 10 is an enlarged, fragmentary, vertical sectional view taken along line 1010 of FIG. 8; and

FIG. 11 is an enlarged, fragmentary, vertical sectional view taken along line 11-11 of FIG. 9.

Referring now in detail to the drawings, there is shown in FIGS. l-5 an improved smokers pipe forming one embodiment of the invention and including a bowl 10 preferably of briar wood, and cooling stem 12 preferably of aluminum exteriorly chromed, a grate pin 14 preferably of aluminum and a bit 16 preferably of nylon. The stem has a tubular, cylindrical front portion 18 with a shoulder 20, a tubular portion 22 and a tubular, cylindrical rear portion 24. The bowl is mounted on and in close-fitting engagement with the front portion 18 and opens into an elliptical inlet 26 of the stem. The grate pin 14 has a cylindrical plug portion 28 fitting closely and slidably in the front end portion of the cylindrical front portion 18 and an O-ring 30 in groove 32 seals the front end portion of the stem. An enlarged head and handle portion 34 abuts the front end of the stem.

A reduced metering portion 40 (FIGS. 1 and 4) of the grate pin 14 has an upper cylindrical surface 42 spaced somewhat inwardly from the inner wall of the front portion 18 and extending beyond all portions of the periphery of the inlet 26. A relieved bottom portion 44 of the metering portion 40 is spaced upwardly a substantial distance from the bottom of the stem to form a flow passage 46 along the bottom portion of the front portion of the stem. The passage 46 extends below an enlarged, close-fitting portion 48 blocking flow along the upper portion of the stern, and a baffle 50 having a forwardly facing frusto-conical portion spaced from the portion 48 by a reduced connecting portion 52 fits closely in the stem and has a top relieved portion 54 defining a restrictive top orifice 56 with the adjacent upper portion of the inner wall of the stem. The smoke flows along the passage 46 where the stem condenses much of the moisture from the smoke and then upwardly and around the connecting portion 52 and through the restrictive top orifice 56 and into the unobstructed portion of the stem to the rear of the baffle. Rear edge 58 of the relieved portion 54 is somewhat sharp to turbulate the smoke. The orifice 56 in addition to its other functions is of such a size as to provide ideal drafting or draw. The baffle 50 also supports the inner end of the pin 14 and thus maintains substantially constant clearance between the metering portion 40 and the periphery of the inlet 26 and insures a close fit of the portion 48 with the upper portion of the stem 12.

An inlet jet orifice or draft port 60 is provided in the top portion of the stem 12 just behind the orifice 56, and air is drawn through the orifice 60 to further turbulate the smoke in the stem and dilute the smoke. The effective cross-sectional area of the orifice 60 should be only a small fraction of that of the orifice 56. The turbulated air-smoke mixture travels along the stem to the bit 16 and further moisture is condensed. The orifice 60 does not permit leakage of condensate since the orifice is at the top of the stem. Also, the orifice 60 is so positioned that the smoker can easily close it with a finger to cause increased draft through the bowl 10 during lighting the pipe and for intensifying combustion when desired.

To get a good tight and sealing fit, the bit 16 includes cylindrical lands and 72 separated by a shallow annular groove 74. The

lands

70 and 72 fit with a friction or interference fit into cylindrical bore portion 76 of the rear portion 24 of the stem 12. The bit is of hard nylon and the portion thereof-to the right of shoulder 78, as viewed in FIG. 1, is annealed by dipping it in boiling water for a few minutes to relieve stress of this portion and better the sealing of the lands with the stem. The lands preferably have a diameter of 0.310 inch for a diameter of the bore of 0.300 inch at its entrance portion tapering to 0.290 inch at the portion of the bore 76 at the land 72. The bit has a counterbore 80 for receiving and holding an end portion of a replaceable filter (not shown). The diameter of the counterbore 80 is from 0.245 inch to 0.250 inch. The diameter of the lands being a nominal 0.310 inch results in a wall thickness of 0.030 inch for the front or first inserted land 72 measured radially from the periphery of the land 72 to the periphery of the counterbore 80, and a slightly greater wall thickness due to the taper for the rear land 70. Due to a slight taper, not shown because of its slightness of the stem 12, this results in, when inserted, friction fits of about 0.010 inch for the rear land and 0.020 inch for the front land. These heavy friction fits are possible because of the reduced diameter of the groove 74, thus only the land 72 is in frictional contact with the bore of the stern for the first two-thirds of the distance of insertion. Land 70 is in contact only for the last one-third of the distance of insertion. Further, by the selection of the wall thickness at the lands and the groove 74, it is possible to take advantage of the inherent characteristics of nylon. That is, its natural lubricity, its compressibility and its flow characteristics. Also, its inherent memory which permits it to return to its original size when freed of restraint. In this pipe, the bit as described can be used (inserted) in its as molded state. The principle can be applied to a pipe bit to be used in a stem of any material, whether straight or taper bore, by selecting dimensions to suit the bore of the stem. The construction disclosed permits the relatively easy insertion and removal of the bit from the stem by employing a rotational motion while inserting or removing, yet it requires a considerable force to remove by a straight-away pull.

Bits may be built somewhat thicker if desired, but require annealing of the insert portion of the bit by placing in boiling water for a few minutes to stress relieve and thus enhance the compressibility and flow characteristics of this portion of the bit.

EMBODIMENT OF FIGS. 6 AND 7 A smokers pipe forming an alternate embodiment of the invention and shown in FIGS. 6 and 7 is identical to the pipe shown in FIGS. lexcept for a grate 114, which fits in a stem 112 having an inlet jet orifice or draft port 160. The grate 114 is identical to the grate 14 except that the grate 114 has two disc-

like baffles

150 and 151 to increase turbulation and condensation. The baffle 150 fits sealingly in the stem except for a top, relieved portion 154 forming an orifice 156. The disc 151 fits sealingly in the stem 112 except at upper, inclined relieved portions 155 which form orifices 157 which are substantially fully offset from the orifice 156.

Reduced portions

152 and 153 connect forwardly facing frusto-conical portions of the discs 150 and 15], respectively, to the disc 150 and an enlarged, close-fitting portion 148. The cross-sectional area of each of the orifices 157 is approximately equal to the cross-sectional area of the orifice 156. The

baffles

150 and 151 are sharp-edged and turbulate the smoke and also condense moisture therefrom. The orifice 156 is of such a size as to provide ideal drafting or draw and the combined areas of the orifices 157 being about twice the area of the orifice 156 do not interfere with the draft regulation by the orifice 156. The orifices 157 distribute the smoke about the stem and thus contribute to the efficiency of condensation and heat dissipation from the smoke.

EMBODIMENT OF FIGS. 8-l1 A smokers pipe forming an alternate embodiment of the invention, and shown in FIGS. 8-11, is substantially identical to the pipe shown in FIGS. 7 and 8 except for a grate pin 214, which fits in a stem 212 having an inlet jet orifice or draft port 216. The pipe includes a bowl 210 and'a bit (not shown) like the bit 16. The grate pin 214 has a cylindrical plug portion 228 fitting closely and slidably in front end portion of a counterbore 218, and an O-ring 230 in an annular groove 232 seals the front end portion of the counterbore 218.

A reduced metering portion 240 (FIG. 8) of the grate pin 214 has an upper cylindrical surface 242 spaced somewhat radially inwardly from the inner wall of the counterbore 218 and extending beyond all portions of the periphery of the inlet 226. A relieved bottom portion 244 of the metering portion 240 is spaced upwardly a substantial distance from the bottom of the counterbore 218 to form a flow passage 246 along the bottom portion of the front portion of the stem. The passage 246 extends below an enlarged, close-fitting portion 248 blocking flow along the upper portion of the stem, and terminates at its rear end at a disc-like baffle 250 having flat forward and rearward faces, the forward face being spaced from the portion 248 by a reduced connecting portion 252. The baffle 250 has a top relieved portion 254 defining a restrictive top orifice 256 with the adjacent upper portion of the inner wall of the counterbore 218. The smoke flows along the passage 246 where the stem condenses much of the moisture from the smoke and then upwardly and around the connecting portion 252, and through the restrictive top orifice 256 and against a disc-like baffle 251 having flat forward and rearward faces 253 and 255. The orifice 256 in addition to its other functions is of such a size as to provide ideal drafting or draw. The

baffles

250 and 251 also support the rear end of the pin 214 and thus maintain substantially constant clearance between the metering portion 240 and the periphery of the inlet 226 and insure the close fit of the portion 248 with the upper portion of the counterbore 218. The baffle 250 fits sealingly in the stem except for the top, relieved portion 254. The disc 251 fits sealingly in the stem counterbore 218 except at side located, relieved portions 257 which form orifices 259 which are substantially fully offset from the orifice 256. A reduced, cylindrical portion 261 connects the

discs

250 and 251. The area of each of the orifices 259 is approximately equal to the area of the orifice 256. The orifice 256 is of such a size as to provide ideal drafting or draw and the combined areas of the orifices 259 being about twice the area of the orifice 256 do not interfere with the draft regulation by the orifice 256. The orifices 259 distribute the smoke about the stem and thus contribute to the efficiency of condensation and heat dissipation from the smoke.

In one constructed embodiment, the peripheral length of a generally elliptical outlet 269 of the bowl 261 is l;inch. The clearance between the portion 242 and the counterbore 218 is a nominal 0.012 inches. The transverse cross-sectional area of the ring-like passage formed between the portion 244 of the pin and the counterbore 218 is approximately 0.025 square inches,

the volmetric capacity of this cavity being approxi-' mately 0.022 cubic inches. The annular groove between the

baffles

250 and 251 and the annular groove between the baffle 250 and the portion 248 were empirically developed. The parameters of the groove between the

discs

250 and 251 are such that the spacing between these discs is sufficiently great so that surface tension and capillary attraction between the two discs are defeated. Also, to this end, the adjacent faces of the discs are parallel to their full depth. Conversely, the spacing between the discs should not be so great as to reduce the velocity of impact of the smoke on the second disc 251. Also, circumfrential escapment is limited so as not to reduce velocity or impact of the smoke impacting against the second disc. The dimensions established to best satisfy these conditions are: spacing between the

discs

250 and 251 is one-sixteenth inches; maximum spacing between these discs is five sixty fourths inches; depth of the groove between the discs is three sixty-fourths inches with a tolerance of to 1/64 inches. The groove between the front disc 250 and the portion 248 has the same depth. The nominal width of this groove is five thirty-seconds inches. This limitation is set so as not to foreshorten the sealing land on the top half of the portion 248. This large crosssection of the groove between the disc 250 and the portion 248 assures an unrestricted supply of smoke to the area of the orifice 256 across the first disc which is calculated to be 0.00434 square inches.

It is essential that the width of the groove between the

discs

250 and 251 be maintained to defeat capillary attraction and surface tension. Otherwise, the passage of the smoke stream through and past the discs and the held moisture results in an undesirable gurgling noise. With the given dimensions the moisture gravitates to the bottom of the grooves.

The two orifices 259 in the second disc 251 are offset from the orifice 256a minimum of 80 to provide an adequately wide impact area in line with the orifice 256 of the first disc 250. A maximum offset of 90 is set to provide for an adequate cavity below the orifices in the second disc.

The length of the counterbore 218 is 1 9/16 inches. The rearward pin penetration is 1 5/16 inches. The diameter of the bore is nominally three-sixteenths inches. Thus, the 74 inch counterbore provides a tapering shoulder 271 of one thirty-second inches. This is the same as the width of the twin orifices 259 of the second disc 251 and provides a secondary point of impact. The /4 inch distance was determined by trial as shorter distances tended to restrict draft as smoking of the pipe progressed. The orifice 256 is located 1 7/16 inches from the forward end of the stem. Thus, the air stream entering the stem adds to the turbulance created as the smoke stream impinges on the shoulder formed by the bottom of the counterbore. The diameter of the air jet through the top side of the stem is one sixty-fourth inches. The cross-section area is 0.0002 square inches. The average cross-section of the stem from the end of the counterbore to the bit is one-fourth inch (threesixteenths inches to five-sixteenths inches). The area is thus an average of 0.0491 square inches. The 2.5 inch length of this cross-section provides a volume of 0.12275 cubic inches.

Since the velocities at the various points are determined by the velocity across the last cross-section, as regulated by the negative pressure created in the mouth, this cross-section is arbitrarily taken as one for purposes of comparison with other points in the draft stream given as located hereinbelow. Beginning at bowl to stem transition, velocity is 1.6. At under side of pin at 244, velocity is 0.78. At the first annular groove, the velocity is 1.3. Across orifice 256 of first disc 250, the velocity is 5.1. In the groove between the first and second orifice discs the velocity is 3.4. Across each of two orifices 259 of the second disc, the velocity is 2.5. In the stem, behind the disc 251, the velocity is 0.39 avg. At the entrance to the bit, velocity is also 039. At the center of the bit, velocity is 4.1. At the exit of the bit, velocity is 1., or progressively as follows: 1.6 0.78 1.3 5.1 3.4 2.5 0.39 4.1 1. If the air jet were not closed the effect of this 0.0002 square inches area would be to reduce the 5.1 to about 5 velocity. Practically, it is probably in the area of 4.8.

The result of these velocity changes is that the high temperature smoke moves through the draft line between bowl and stem. In so doing, it is forced against the relatively massive pin 214 and also the stem side wall. A circular motion is imparted to the smoke causing it to scrub the stern side walls and circle upwardly to strike the underside 244 of the pin. Velocity is reduced in this area and there is time for substantial heat transfer to the highly conductive metal of the stem. A substantial amount of the heat is given up here resulting in condensation of moisture and the adhesion of entrained solids to the parts. As the smoke continues rearwardly, velocity increases until it reaches maximum across the orifice 256 of the first baffle disc 250. Velocity is at such a level here that rearward travel continues until the violent impact with the second disc 251, at which time the smoke is slowed and deflected into the annular passage formed by the adjacent faces of the discs. A predicable repeating phenomena occurs in the area where smoke passes across the first disc 250 and impacts on the wall of the second disc. This is that a small semi-solid condensate forms on the impact area of the disc 251 which is that area in line with the orifice 256. This mass builds up to almost fully filling the cavity at the wall of the second disc, and tapers toward the orifice of the first disc. Under magnification, this appears as a gelatine-like material. At this point it has not been analysed but it does effectively demonstrate the separation of solid from smoke bythe structure disclosed. The smoke continues on through the passage between the discs and across the two orifices 259 at about one-half the velocity at the first orifice 256. The smoke is forced to impinge upon the shoulder 271 of the counterbore 218. Turbulance results and is added to by the air jet entering at this point. The smoke moves at a slow rate through the balance of the stem allowing further dropout and adhesion of solids remaining. At this point the smoke has given up the greatest portion of heat as evidenced by the stem having practically no sensible heat midway between the bowl and the stem. As the smoke enters the bit there is a tendency for remaining minute particles to adhere to the side wall as the smoke accelerates to the orifice at the center of the bit. The velocity through this orifice is high and thus discourages any closure by deposit.

The effectiveness of the entire system is demonstrated by the need to clean the pipe after several smokes.

What is claimed is:

1. In a smokers pipe,

a horizontally disposed metal stern having a cylindrical smoke passage means therein,

a bowl secured to the stem and having means providing an outlet communicating with a forward portion of the passage,

and a one-piece bit having a pair of lands each extending transversely thereof 360 defining a shallow groove extending 360 therebetween and transversely thereof,

the rear portion of the passage means receiving the lands with a friction fit,

one of the lands being at the extreme forward end of the bit and the other land being at a shoulder abutting the stem, the bit being composed of nylon,

and a grate fitting in the forward end portion of the passage,

the grate including a baffle located at the rear of the grate and fitting closely in the passage means, the baffle having means providing a relieved upper portion which defines an orifice with the adjacent portion of the passage.

2. The smokers pipe of claim 1 wherein the stem has an air inlet at the upper portion thereof just to the rear of the baffle and to the rear of the bowl.

3. In a smokers pipe,

a metal, heat conducting, horizontally disposed stem having means providing a passage therein,

a bit at a rear end of the stern,

a vertically disposed bow] at the forward end of the stem and having means providing a bottom outlet into the stem,

the stern having means providing an air orifice means located just to the rear of the bowl and at the top of the stern, so that the orifice means may be closed by the finger of a smoker,

a metal, heat conducting grate pin insertable from the forward end of the stem and having a grate portion substantially covering and spaced below the bowl,

the grate pin having a forward baffle at the rear portion thereof and fitting closely in the stem and relieved at the top thereof to form a passage means providing a flow path with the adjacent'portion of the stem to produce a high velocity jet of smoke,

the grate pin also having a rearward baffle fitting closely in the stem and located in the smoke flow path to block direct flow past the rearward baffle, the rearward baffle being located forwardly of the orifice means in the stem and having means forming side passages with the stem.

4. In a smokers pipe,

a vertically disposed bowl,

a bit,

a horizontally disposed heat conducting, metal stem having a passage therethrough and carrying the bit and the bowl at opposite ends thereof,

the bowl being on top of a forward end portion of the stem and having means providing a bottom outlet,

and a heat conducting, metal grate fitting in the forward portion of the stem and having a disc-like baffle at the rear end thereof fitting sealingly at the lower portions of the baffle and having means forming an orifice means with the wall of the passage at the upper portion of the baffle,

the grate including a second disc-like baffle spaced rearwardly from the first-mentioned baffle and having means providing a side relieved portion forming a second orifice means, the orifice means being offset from each other,

the stem having an air inlet orifice means in the top portion thereof just to the rear of the baffle.

5. In a smokers pipe,

a vertically disposed bowl,

a bit,

a horizontally disposed stem having means providing a passage therethrough and carrying the bit and the bowl at opposite ends thereof,

the bowl being on top of the forward end portion of the stem and having means providing a bottom outlet,

and a grate fitting in the forward portion of the stern and having a disc-like baffle at the rear end thereof fitting sealingly at the lower portions of the baffle and having means forming an orifice with the wall of the passage means at the upper portion of the baffle,

the orifice means and the portion of the passage means at which the disc is located being of such relative sizes that the cross-sectional area of the orifice is a small fraction of that of said portion of the passage means, whereby a high velocity jet is created at the orifice means,

the grate including a second disc-like baffle positioned in the path of said jet perpendicular to the jet to receive the jet with a high impact to precipitate moisture and solids from the jet,

the second disc-like baffle having relieved portions offset from the orifice forming smoke passages with the stem.

6. The smokers pipe of claim 5 wherein a rod-like portion joins the discs and forms passage means between the inner wall of the stem and the discs, said last named passage means having a cross-sectional size substantially greater than that of the orifice means.

7. The smokers pipe of claim 5 wherein adjacent portions of the discs are substantially planar and are substantially perpendicular to the stem.

8. The smokers pipe of claim 5 wherein the widths of the orifice means and the last named passage means are sufficiently great to defeat surface tension and capillary action.

9. The smokers pipe of claim 8 wherein each of the 1 last named passage means are spaced at least from the orifice means.

10. The smokers pipe of claim 9 wherein the width of said orifice means is at one-sixteenth of an inch and not greater than five-sixty-fourths of an inch.

11. The smokers pipe of claim 10 wherein the spacing between the baffles is about five-thirty-seconds of an inch.

12, The smokers pipe of claim 5 wherein the portion of the stem in which the baffies are positioned is a counterbore means having an end at the rear of the second baffle, said end of the counterbore defining a shoulder providing a point of impact between the rear end of the stern and the forward end of the bit.

13. The smokers pipe of claim 12 including means providing an orifice in the wall of the stem at a point to the rear of the second baffle to turbulate the smoke.

14. In a smokers pipe,

a horizontally disposed thin-walled tubular metal stem open at both ends, and having means providing a top smoke inlet near its forward end,

a bit fitting in the rear end portion of the stem and having a smoke passage therethrough,

a bowl mounted on the front end portion of the stem having means providing an outlet in communication with the inlet means,

and a grate pin fitting in the front end portion of the stem having a downwardly facing crescent-shaped portion adjacent the inlet means, a first baffle to the rear of the inlet and relieved to form an orifice means with the wall of the stem, a rod-like spacer at the rear of the first baffle and a second baffle on the rear end of the spacer and having side relieved portions to form passage means,

velocities of passage of the smoke being in the ratio of 1.6 at the inlet means, 0.78 at the cresent shaped portion, 1.3 just ahead of the orifice means, 4.52 at the orifice means, 3.4 between the baffles, 2.21 at the passage means, 0.39 at the stern and bit, 4.1 in the central portion of the passage means in the bit and 1 at the rear end portion of the bit.

Claims

1. In a smoker''s pipe, a horizontally disposed metal stem having a cylindrical smoke passage means therein, a bowl secured to the stem and having means providing an outlet communicating with a forward portion of the passage, and a one-piece bit having a pair of lands each extending transversely thereof 360* defining a shallow groove extending 360* therebetween and transversely thereof, the rear portion of the passage means receiving the lands with a friction fit, one of the lands being at the extreme forward end of the bit and the other land being at a shoulder abutting the stem, the bit being composed of nylon, and a grate fitting in the forward end portion of the passage, the grate including a baffle located at the rear of the grate and fitting closely in the passage means, the baffle having means providing a relieved upper portion which defines an orifice with the adjacent portion of the passage.

2. The smoker''s pipe of claim 1 wherein the stem has an air inlet at the upper portion thereof just to the rear of the baffle and to the rear of the bowl.

3. In a smoker''s pipe, a metal, heat conducting, horizontally disposed stem having means providing a passage therein, a bit at a rear end of the stem, a vertically disposed bowl at the forward end of the stem and having means providing a bottom outlet into the stem, the stem having means providing an air orifice means located just to the rear of the bowl and at the top of the stem, sO that the orifice means may be closed by the finger of a smoker, a metal, heat conducting grate pin insertable from the forward end of the stem and having a grate portion substantially covering and spaced below the bowl, the grate pin having a forward baffle at the rear portion thereof and fitting closely in the stem and relieved at the top thereof to form a passage means providing a flow path with the adjacent portion of the stem to produce a high velocity jet of smoke, the grate pin also having a rearward baffle fitting closely in the stem and located in the smoke flow path to block direct flow past the rearward baffle, the rearward baffle being located forwardly of the orifice means in the stem and having means forming side passages with the stem.

4. In a smoker''s pipe, a vertically disposed bowl, a bit, a horizontally disposed heat conducting, metal stem having a passage therethrough and carrying the bit and the bowl at opposite ends thereof, the bowl being on top of a forward end portion of the stem and having means providing a bottom outlet, and a heat conducting, metal grate fitting in the forward portion of the stem and having a disc-like baffle at the rear end thereof fitting sealingly at the lower portions of the baffle and having means forming an orifice means with the wall of the passage at the upper portion of the baffle, the grate including a second disc-like baffle spaced rearwardly from the first-mentioned baffle and having means providing a side relieved portion forming a second orifice means, the orifice means being offset from each other, the stem having an air inlet orifice means in the top portion thereof just to the rear of the baffle.

5. In a smoker''s pipe, a vertically disposed bowl, a bit, a horizontally disposed stem having means providing a passage therethrough and carrying the bit and the bowl at opposite ends thereof, the bowl being on top of the forward end portion of the stem and having means providing a bottom outlet, and a grate fitting in the forward portion of the stem and having a disc-like baffle at the rear end thereof fitting sealingly at the lower portions of the baffle and having means forming an orifice with the wall of the passage means at the upper portion of the baffle, the orifice means and the portion of the passage means at which the disc is located being of such relative sizes that the cross-sectional area of the orifice is a small fraction of that of said portion of the passage means, whereby a high velocity jet is created at the orifice means, the grate including a second disc-like baffle positioned in the path of said jet perpendicular to the jet to receive the jet with a high impact to precipitate moisture and solids from the jet, the second disc-like baffle having relieved portions offset from the orifice forming smoke passages with the stem.

6. The smoker''s pipe of claim 5 wherein a rod-like portion joins the discs and forms passage means between the inner wall of the stem and the discs, said last named passage means having a cross-sectional size substantially greater than that of the orifice means.

7. The smoker''s pipe of claim 5 wherein adjacent portions of the discs are substantially planar and are substantially perpendicular to the stem.

8. The smoker''s pipe of claim 5 wherein the widths of the orifice means and the last named passage means are sufficiently great to defeat surface tension and capillary action.

9. The smoker''s pipe of claim 8 wherein each of the last named passage means are spaced at least 80* from the orifice means.

10. The smoker''s pipe of claim 9 wherein the width of said orifice means is at one-sixteenth of an inch and not greater than five-sixty-fourths of an inch.

11. The smoker''s pipe of claim 10 wherein the spacing between the baffles is about five-thirty-seconds of an inch.

12. The smoker''s pipe of claim 5 wherein the portion of the sTem in which the baffles are positioned is a counterbore means having an end at the rear of the second baffle, said end of the counterbore defining a shoulder providing a point of impact between the rear end of the stem and the forward end of the bit.

13. The smoker''s pipe of claim 12 including means providing an orifice in the wall of the stem at a point to the rear of the second baffle to turbulate the smoke.

14. In a smoker''s pipe, a horizontally disposed thin-walled tubular metal stem open at both ends, and having means providing a top smoke inlet near its forward end, a bit fitting in the rear end portion of the stem and having a smoke passage therethrough, a bowl mounted on the front end portion of the stem having means providing an outlet in communication with the inlet means, and a grate pin fitting in the front end portion of the stem having a downwardly facing crescent-shaped portion adjacent the inlet means, a first baffle to the rear of the inlet and relieved to form an orifice means with the wall of the stem, a rod-like spacer at the rear of the first baffle and a second baffle on the rear end of the spacer and having side relieved portions to form passage means, velocities of passage of the smoke being in the ratio of 1.6 at the inlet means, 0.78 at the cresent shaped portion, 1.3 just ahead of the orifice means, 4.52 at the orifice means, 3.4 between the baffles, 2.21 at the passage means, 0.39 at the stem and bit, 4.1 in the central portion of the passage means in the bit and 1 at the rear end portion of the bit.