US1555275A - Tobacco pipe - Google Patents

Description

Sept. 29, 1925. 1,555,275

' N. s. CRAWSHAW TOBACCO PIPE Filed Aug. 20, 1924 Patented Sept. 29, 1925.

NORMAN SCOTT CRAWSHAW,

or HALIFAX, ENGLAND.

TOBACCO PIPE.

Application filed. August 20, 1924. Serial No. 733,057.

To all whom it may concern:

, Be it known that I, NORMAN SHAW, a subject of Soorr CRAW- V of Great King George tion.

1 pipes invention in or relating to tobacco has for its object to provide an improved construction designed to prevent efiectively condensation products and the like passing to the mouthpiece or saliva making its way along the stem According to my invention the bowl of a to the tobacco.

tobacco pipe has attached to or forming part of 1t a tube or stem having a bore of circular cross section to receive a plug forming part of or attached to. being so formed as to fit within said. tube a mouthpiece, said plug and divide it into two longitudinal chambers and being formed preferably st longitudinal with battles on either side,

aggered, to divide each of said smaller chambers,

chambers into two or more passages being in said plug to allow the smoke to pass through such smaller alternately on either tion of the plug.

. of the stem may be in its length.

The invention causes chambers in succession slde of the central porthe smoke to be cooled effectively during its passage to the mouthpiece thereby obv1at1ng the harmful effect of a direct blast of hot smoke on to the.

tongue or mouth, and the possibility of ab sorption' of mcotlne 1s reduced to a 1mm- A further advantage presented by the invention is that it provides a construction which permits of easy cleaning both of the bore of the stem and of the mouthpiece and fitment carried thereby.

The manner in which the invention is carried into practice will be described with reference to the accompanying drawing wherethereto Figs. 2 and 3 illustrate elevation of a pipe an arrangement of the baflles on lines similar to Fig. .1 but notched as in Fig. 2'and staggered as in Fi 3' b 7 I plan respectively an alternative arrange-1 Figs 4 and 5 illustrate in elevation andv .retention of any saliva provided The portion of the plugj which effects the division of the tube or bore either straight or twisted ment of the battles whereby the smoke is made to take a tortuous course alternately above and below the principal longitudinal division;

Fig. 6 is a detail illustrating the baffles arranged further apart than in Figs. 4 and 5, as allowed for by an increase in the length of the pipe stem, and making possible the provision of a separate cavity or space for the which may proceed from the mouthpiece in bowl; and

Fig. 7 illustrates a further alternative which, whilst providing upright baflles connected at the top and bottom ensures as in the former illustrations, accessibility for cleaning purposes.

Referring firstly to- Fig. 1, the stem or of the pipe is, according to my invention, straight and is bored out to an even diameter from the outer end up to the passage on leading from the stem into the bowl cavity, the 'bore of the stem and the passage a being, preferably, co-axial.

The mouthpiece b, which may be of any suitable material, is provided with a plug 0 of metal or other suitablematerial of a diameter to fit closely within the bore of the stem. The material of the plug is removed appropriately to form a central web or dividing member 0' having projecting from it, on diametrically opposite sides, half circular projections or bafiles c o and 0 0* which form as it were two pistons with upper and lower chambers d, d separating the pistons and upper and lower chambers e, e separating the piston formed by the bafiles c from the outer end portion of the plug.

The baffles are formed at such a distance from the inner end of the plug as to leave a relatively short fin or portion of the division 0' projecting beyond them and the end of this fin is adapted to fit closely up to the inner end of the bore when the plug is fully inserted. The end of the projecting fin has a central recess f opposite the entrance from the bore to the pasage a, so that smoke may pass either above or belowthe fin.

The baffles 0 haveeach a peripheral notch 0 connecting the space 9 with the chambers (Z and d, and the portion of the division 0 between said chambers has a central vertical opening h putting the two chambers in communication. This opening it is preferably disposed, as shewn, about midway of the length of the chambers. Smokecan thus the direction of the I pass into either of the chambers from space 9 and from chamber cl to chamber 03 by way of opening it.

To provide a smoke passage past the piston formed by the baffles 0 the bore of the stem is provided with a sleeve 6, provided in its upper part with an opening 2" disposed opposite the upper baffles c and forming as it were a by-pass. Obviously, instead of employing a sleeve with an opening in it, the sleeve may be dispensed with and a groove or recess be made in the upper part of the bore itself. By making the piston imperfora-te and circular, and making the passage 2" of greater length than the thickness of the piston, the condensation products are trapped independently of the position of the plug in the cylindrical chamber, and the plug can be turned around on its axis if desired from the position shown.

The portion of the division 0, connecting the piston formed by the baffles 0 with the outer end portion of the plug, has a vertical opening 7' which forms acommunication between the upper and lower chambers e, e and also forms a communication between both said chambers and an axial opening 0 through the end portion of the plug in alignment with the bore 6 of the mouthpiece.

Smoke can thus pass from chamber (1 by way of the bypass into chamber 6 and thence to the mouthpiece.

The main portion of the condensation products such as nicotine oil collect and are trapped in the chamber d. They cannot pass this point by reason of the solid lower baffle c of the plug fitting closely in the bore, and even if a considerable quantity collects in liquid form the position of the opening it prevents escape of the products into the climber (Z in the event of the pipe being laid on its side or held vertically with the mouthpiece pointing either downwardly or upwardly.

saliva which may pass along the bore of the mouthpiece becomes trapped in the chamber 6' and cannot get to or mingle with the condensation products.

WVhen the plug is withdrawn, the baffles c and c and the edges of the division 0 and of the projecting fin at the inner end of same act as scrapers, so that any collected matters are detached from the surface of the bore and are removed along with the plug, the bore thus being left perfectly clean.

The notch c in the upper baffle 0" may be dispensed with and the whole of the smoke be compelled to pass through chamber d before entering chamber d.

The end of the central web or dividing member of the plug may be reduced in width, as shown at 0 in Fig. 2, and this reduced portion may extend into the passage a, the latter being appropriately enlarged to" receive it. The extension may be sufficiently long to project into the bowl cavity in which case it will serve, on rotation of the plug, to disturb or loosen any caked or hardly pressed portion 'of tobacco which may be impeding the draught. Obviously, if so fashioned the plug will require to be made of metal or some other suitable material not afiected by heat.

The form of plug shown in Fig. 2 also obviates the necessity for providing a bypass between chambers (Z and e, thisbeing effected by forming in the upper baifie. 0 a notch or groove k.

The plug shown at Fig. 3 also obviates the necessity for a by-pass and provides a tortuous path for the smoke somewhat different from that provided by the plugs of Figs. 1 and 2. In thisinstance, the upper side of the web a has a third battle 0 and one end portion of the upper baflie 0 and the opposite end portion of the bafiie c are cut away as shewn. The plug of Fig. 3 is shewn also as having the inner end portion 0 of the same width as the body of the plug, the bore of the stem being in this instance continued right up to the bowl cavity instead of a reduced passage a being provided between the inner end of the bore-and thebowl cavity. The tobacco thus does not reachthe bottom of the bowl cavity and draught is afforded by perforating the projecting portion or fin as shewn in Figs. 2 to 5 and in Fig. 7.

Figs. 4 and 5 show another arrangement which may be adapted. In this instance the central web has a series of semicircular proections or baflles 0 on its upper side and another series 0 on its lower side, the two series being arranged in staggered formation as shewn. Between each upper and lower baffle a vertical passage Z is formed, so that the smoke is caused to take a tortuous path alternately above and below the central dividing web as indicated by the arrows. In this instance condensation products are trapped in the space m and saliva in the space a. If however, the pipe be held vertically with the bowl downwards there is a possibility of the saliva finding its way into the space m, or if it be held in the reverse direction of liquid products from space m finding their way into space 11..

This may be obviated, as shewn in Fig. 6, by making the pipe stem of greater length such as to permit of the bafliles being sufficiently far apart to admit of the provision, between the outlet to the mouthpiece and the first baffle on the upper side of the dividing web, of a semicircular bafiie 0' on the underside of the dividing web. A trap n is thus provided for the saliva, whilst any condensation products which find their way so far down towards the mouthpiece will, i f the pipe be held vertically with the mouthpiece downwardly, be trapped in the right hand portion of the space to the left of the baffle 0.

Still another arrangement is shewn at Fig. 7 when cavities or chambers formed alternately above and below the axis of the stem are connected by horizontal openings 0, or it may be by angularly disposed openings, in the vertical portions or baffles 10. The openings 0 are preferably arranged in staggered formation so as to cause the smoke to take a tortuous path and instead of being formed through the baflies may be in the form of notches in the edges of the baffles.

As previously mentioned, the dividing web of the plug, instead of being straight as shewn in the drawings, may be twisted or of spiral form.

The invention provides a self-contained cleaning apparatus and enables damage to the pipe by the use of a knife or other scraping tool to be avoided. The rotation of the mouthpiece in the act of withdrawal causes the edges of the baffles and of the dividing member to act as scrapers and to remove any adherent deposits from the wall of the bore. When the mouthpiece has been withdrawn, the deposits on the various surfaces of the plug and in the vertical or horizontal communicating passages or notches can be removed easily with the aid of a match. Where a projecting fin portion 0 or a is provided the end of this, being rounded off as shewn, may be employed to clean out, if necessary, the bottom of the bowl cavity.

Although I have referred to and described the invention as being applicable to pipes, it will be understood that the mouthpiece o a cigarette or cigar tube or holder may be provided with a plug or fitting as herein described. In such case, of course it will not be necessary to provide a projecting fin or end portion such as a or c on the dividing member.

In all cases, ably secured to the the plug or fitting is prefermo-uthpiece by one or two rivets such as r, Fig. 1, these rivets being so arranged as to perform the added function of indicating the correct position the mouthpiece should occupy in the stem.

Having thus described by invention, what I claim as new and desire to secure by Letters Patent is 1. A tobacco pipe having a cylindrical chamber provided with a smoke passage in its upper side, and a mouthpiece provide with a plug which fits in the said chamber, said plug being provided with a web which divides the chamber into two compartments, said web being in the form of an imperforate cylindrical piston arranged opposite the said passage and of less thickness than the length of the passage.

2. A tobacco pipe as set forth in claim 1, provided with a liner secured in the said cylindrical chamber and having a hole in its upper side which forms the said passage for smoke past the said piston.

In testimony whereof I aflix my signature.

NORMAN soorr ORAWSHAW.

ass

Images