US2375312A - Smoking pipe - Google Patents

Description

N. MIKELsoN I 2,375,312

lslvxoKINcfPIPE May 8, 1945.

Filed Mlarcn' 2, 1943 /z/Omfa/ Mks/aw,

Patented May 8, 1945 SMUKING PIPE Nordal Mikelson, Sioux Falls, S. Dak., assignor of forty-five per cent to R. E. Dickenson and W.J.

Dickenson, both of Sioux Falls, S. Dak.

Application March 2, 1943,, Serial No.4'77j727 4 claims' cl.131-`2o2 This invention relates to tobacco pipes, and the primary object thereof is to provide in a pipe bowl a simple and effective means of preventing accumulation of moisture in the lower part of the tobacco charge and in the smoke duct, and furthermore to provide such means without materially adding to the cost of the pipe and without unduly complicating its operation.

A well known disadvantage of tobacco pipes of the usual sort isA that moisture from the burningV tobacco. tar, and similar combustion products, being drawn from the burning tobacco at the top of the charge, are passed through the underlying tobacco and condense in the unburned tobacco, particularly at the bottom of the bowl and immediately adjacent the entrance of the smoke duct. This rnoistureinterferes with proper burning of the lower part of the tobacco charge, and the condensed combustion products impart a harsh and disagreeable quality to the smoke produced by the tobacco containing them. The progressive increase'in moisture content of the 'tobacco as combustion advances through the charge also results Vin condensation of increasing amounts of moisture and tar in the smoke duct, producing slugs that are drawn into the mouth of the smoker. The present invention overcomes these difiiculties by providing passage for the smoke laterally from the combustion zone, to a large extent avoiding passage of the smoke through the lower partl of the tobacco charge. Condensation of moisture and tar in the tobacco underlying the combustion zone is largely eliminated and the pipe lbowl is thereby kept dry, permitting uniform combustion of the entire charge and production of a uniform quality of smoke.

In the accompanying drawing;

Fig, 1 is a side elevation of a pipe having a bowl arranged in accordance with this invention.

Fig. 2 is a plan view.

Fig. 3 is a sectional view on line 3 3 of Fig. 1.

Fig. 4 is an enlarged fragmentary longitudinal sectional view showing the'novel portion of the pipe bowl.

Fig. 5 is a cross-sectional view of the smokeconducting element of the assembly.

Describing the drawing in detail, the pipe comprises, as usual, a stem 6 and a bowl 'I provided with a wall 8 that en'closes a combustion chamber 9. A smoke duct IE) c-ommunicates with the passage of the stem 6. In the usual form of pipe, a smoke duct corresponding to the duct l enters the bottom of the combustion chamber, so that all products of combustion are drawn downwardly through the chamber and withdrawn at'the bottom of the bowl.` In the present bowl a smoke passage is extended alongside and parallel to the combustion 'chamber 9 and an elongate slot is provided for direct withdrawal of the smoke from the combustion zone. This may be accomplished,

as illustrated, by means of a tubular element 'll arranged in a well l2 contained in the wallfB at one side of and parallel to the combustion chamber, with which the wellcommunicates by a gate 53. The smoke duct I U communicates With asmoke passage IG enclosed by the element H- by way of a port l5.

Ingress to the smoke passage Hi enclosed by the element H, for smoke from the combustion chamber 9, is provided by an elongate Vslot .|6. extended axially of the elementl H .and parallel to the direction of advance of the burning of the tobacco, which slot IS is exposed to the interiorV of the combustion chamber 9 by the gate l3.

The top end of the tubular element Il; being closed by a plug H, it will be seen that suction applied to the smoke 'duct l0|wil1 result ina our-- rent of air being drawn through the combustionl V sistance to pass'age of air, it is necessary to satisfactory operation of the pipe to prevent passage of air directly to the passage M above the combustionzone, Such by-passing of the combustion zone is prevented by making the slot IB sufficiently' narrow to trap combustion products, including ash and carbon, from the combustion zone, Which trapped products plug the slot progressively along its length as the combustion zone advances, thereby blocking the slot against free entrance of air combustion and effect flow of smoke to the passage M and the duct IO. When a charge of tobacco has been consumed, the trapped material plug-v gingthe slot IG can be readily removed by blowing sharply through the duct H).

In order to facilitate the plugging of the slot IG, it is preferably V-shaped in cross-section, as shown in Fig. 5, With the wider side of the slot arranged externally of the element Il and toward the combustion chamber 9. The inner, narrower side of the slot is wide enough to permit passage of smoke, but sufiiciently narrow to trap fine ash and carbonized tobacco,,and become plugged by such material.

Since a considerable part of the smoke entering the -passage I 4 by way of the slot IS comes directly from the combustion zone, the smoke entering the passage 14 has hot and harsh qualities. To produce cooling and filtering efiects similar to those of tobacco underlying the combustion zone in a standard pipe, the smoke passage Id is filled with a body l8 of filtering material. Advantageously this material is tobacco, since by its use the normal flavor of the smoke is preserved, and the best qualities of a standard pipe are duplicated.

It has been proven by actual test that a pipe arranged in accordance with the foregoing disclosure avoids the disadvantages of the standard type of pipe bowl, and that a charge of tobacco burned therein will burn uniforinly and completely without appreciable condensation of moisture in the lower part of the charge or the smoke duct, resulting in a completely dry pipe so far as delivery of harsh smoke and slugs of condensed moisture are concerned. The filtering material IR may be replaced whenever necessary, the plug ll being removable for the purpose.

I claim as my invention:

1. A tobacco pipe comprising a bowl having a said tube being in communication adjacent to its lower end With said smoke duet, said tube having therein a slot substantially co-extensive in length therewith and alined With the slot in said bowl, said tube slot being sufi'iciently wide to afford ready passage for smoke from the combustion chamber into said tube and sufliciently narrow to trap combustion products from tobacco burnt in the combustion chamber so as to become progressively plugged by said products above the bottom of the combustionzone as said zone advances during burning of the tobacco.

2. A tobacco pipe as set forth in claim 1, in which the tube slot is substantially of V-shape in crosssection and is wider toward the combustion chamber than toward the smoke eduction passage and has a Width toward the combustion chamber suflicient readily to receive combustion products from the zone of burning of tobacco in the chamber and a width toward the smoke passage sufliciently narrow to trap such combustion products and become thereby plugged above the combustion zone as the latter advances.

3. A tobacco pipe as set forth in claim 1 in Which the edges of the walls defining the elongated tube slot are spaced a relatively wide distance apart at the combustion chamber side of tube and in which the distance between the edges of the elongated spaced side walls of the tube slot away from the combustion chamber are substantially closer together than the firstnamed edges of said walls.

4. A tobacco pipe including a bowl having a combustion chamber and a well separated by a division wall provided with a slot of substantially V-shape in cross-section affording communication therebetween, said slot being sufliciently wide to afford ready passage for smoke from the combustion chamber into said well and sufiiciently narrow to trap combustion' products from tobacco burnt in the combustion-chamber so as to become progressively plugged throughout its length from top to the bottom thereof by said products above the bottom of the combustion zone as said zone advances during burning of the tobacco.

NORDAL MIKELSON.

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