CLOSED-TYPE SMOKING DEVICE
Technical Field The present invention relates to a smoking device for inhaling aerosols and gasses, such as cigarette smoke. More particularly, the present invention relates to a smoking device which comprises a body and a combustible generating gasses and aerosols upon combustion inside the body in such a manner that flame and smoke are not spread outside. The smoking device of the present invention is less harmful to humans, minimizes the damage of second-hand smoke, has no risk of causing a fire or burns, provides various cigarette flavors, is convenient to use without the need for a lighter, is sanitary because no ash falls, and is high quality.
Background Art In general, ideal smoking devices must satisfy the following requirements. First, smoking devices must be less harmful to habitual smokers themselves. Conventional cigarettes contain a variety of flavorants for better cigarette flavor, humectants, e.g., glycerin, for maintaining humidity at a constant level to soften the cigarette flavors, a combustion aids for preventing the cigarette from being extinguished, and the like, other than a pure leaf tobacco. Conventional cigarette paper (paper wrappings and rolling leaf tobacco) contain an organic fiber consisting essentially of hemp, a filler (e.g., hard calcium carbonate), and a combustion aids (e.g., ammonium phosphate) for improving combustibility and improving the shape of ashes. In addition, an adhesive is used to maintain the cylindrical shape of the cigarette paper. Accordingly, smokers inevitably inhale cigarette smoke evolved from the cigarette paper and the adhesive. According to a report from the U.S.A, cigarettes made in the U.S.A prior to being burned contain 599 ingredients, which generate about 4,000 substances upon pyrolysis. Of these, 20 or more substances have been shown to be carcinogenic. Since the generation of carbon monooxide (CO) is inevitable, smoking is recognized to be a great hazard to the health of smokers. Now conceptual cigarettes which are less harmful than conventional cigarettes are defined as "safer cigarettes". The safer cigarettes are divided into smokeless cigarettes and harmful substance-free cigarettes. In addition, the safer cigarettes include patch-, spray-, inhalation- and aerosol-type cigarettes in terms of their form. Methods for catalytically converting carcinogenic substances into non-carcinogenic substances by the addition of catalysts, methods for reducing the formation of carcinogenic substances in cigarettes by the addition of catalysts, such as titanium, tin, iron, copper, palladium., vanadium, etc., methods for delivering nicotine to smokers using heating instead of combustion, methods using nicotine analogues having similar functions and being less harmful to smokers, smokeless cigarettes, and low-smoke cigarettes have been developed until now. However, since these prior arts use processes other than combustion, flavors inherent to cigarettes and smoking satisfaction are poor, and there is a risk of side effects due to the additives. Secondly, smoking devices must be less offensive to others. With the increasing public perception that smoking is offensive to others, non-smokers strongly feel hatred toward smoking. This perception prevents smokers from freely enjoy smoking. Cigarette smoke includes main-stream smoke directly entering the mouth of a smoker by the inhalation of the smoker, and side-stream smoke naturally evolved during combustion in air, i.e., during burning a raw tobacco. Depending on habits and attitudes of smokers, side-stream smoke accounts for 55-70% of the total cigarette smoke. Accordingly, considerable attention has focused on environmental pollution and second- hand smoking problems caused by the side-stream smoke. Main-stream smoke, which are inhaled into the bronchi of smokers and then exhaled, and side-stream smoke are collectively defined as "environmental tobacco smoke (ETS)". The main-stream smoke occupies only about 13% of ETS and the side-stream smoke comprises the remainder (about 87%). An example of prior arts for reducing the evolution of side-stream smoke is the use of a low side-stream smoke cigarette paper. For this purpose, a method of using special cigarette paper which is heavier than general cigarette paper, a method for reducing the formation of side-stream smoke particles by the use of cigarette paper containing an inorganic filler such as CaCO Al(OH)3 or Mg(OH) , a method for filtering tar using cigarette paper, a method for promoting the moisture condensation in the inner surface of cigarette paper, or a method for thermally decomposing side-stream smoke into invisible volatile low-molecular materials, have been utilized. However, these methods have problems of complicated processes. In addition, since the shape of cigarette ashes is changed into that of scorched rice, scattering is likely to happen and contaminate clothes, causing displeasure to others. Further, since particulate materials are hardly released and accumulated, the combustion temperature is increased, causing the formation of a large amount of carbon monooxide. Further, since moisture acting as an abirritant is absorbed in the cigarette paper upon smoking, the irritation is severe. Furthermore, the additives may cause safety problems. Thirdly, smoking devices must be safe. Because most conventional cigarettes have a burning section exposed to the outside, physical risks exist. Cigarettes are responsible for unknown fires including forest fires. The temperature of a burning cigarette reaches 700~950°C in an oxygen- short burning section, but 200~600°C in an oxygen-rich section in the rear portion of the burning section due to pyrolysis and distillation phenomena. Nicotine is formed at a temperature less than 250°C. Since a burning cigarette is accidentally dropped, or a lump of a burning section, i.e., spark, falls during driving, it causes the driver embarrassment. This is because the burning section is exposed to the outside. In addition, the burning cigarette may damage passers-by, particularly, children, against the smoker's will. Recently, smoking has been prohibited in airplanes, oil tankers, gas stations and other public areas due to the danger of fire. Thus, there is a need for a smoking device which oan protect people from physical risks and allow a smoker to freely and comfortably enjoy smoking regardless of place. Fourthly, smoking devices must be convenient to use. A lighter or match as an ignition source is essential to ignite conventional cigarettes. In addition, an ashtray is required while a smoker is smoking indoors. Furthermore, conventional cigarettes have disadvantages that it is impossible to smoke in the midst of rain and the original cigarette flavors are maintained upon smoking in a severely windy place. Thus, there is a need for a smoking device which can solve the aforementioned problems encountered during smoking and is simple to use. Fifthly, smoking devices must satisfy habitual smokers' diverse needs associated with cigarette flavors. According to conventional cigarettes, air dilution rate (i.e. dilution rate of cigarette smoke (main-stream smoke) inhaled into the mouth of a smoker by air introduced through apertures formed on a tip paper of a filter and apertures formed on cigarette paper) and the amount of flavorants added are fixed. Accordingly, since smokers cannot control the air dilution rate and the amount of the flavorants, they cannot feel stronger or milder taste at their will. Thus, there is a need for a smoking device which allows smokers to control the air dilution rate and the amount of flavorants depending on various preferences of the smokers. Sixthly, smoking devices must be highly sanitary. Once conventional cigarettes have been smoked, they inherently leave behind ashes and butts, thus polluting the ambient environment. In order to prevent cigarette ashes from being blown out of the ashtray, a piece of wet tissue paper may be placed on the ashtray. However, tar permeates the tissue paper, an adhesion portion of cigarette paper is torn and shredded tobacco pours from the cigarette, making the ashtray dirty within a few minutes. Particularly, a completely closed ashtray must be prepared inside a car in order to block the spread of odor generated from cigarette butts. Even after the ashtray is empty, the offensive odor still remains inside the car. When a smoker speaks after smoking, a bad cigarette smell arises from the mouth of the smoker and is soaked in the hands of the smoker, strongly causing an unclean impression to others. Cigarette smoke smell disgusts non-smokers, irrespective of main-stream smoke or side-stream smoke. Since smoke essentially spreads during smoking, it is preferred that the smoke is covered with a favorable fragrance. To this end, the addition of an additive is required. Therefore, there maybe a possibility of formation of harmful substances. Thus, there is a need for a smoking device which can satisfy smokers' latent needs toward sanitation, which could not have been accomplished by conventional cigarettes. Finally, smoking devices must be high quality. There is a need for a smoking device which solves or diminishes the above- mentioned"aversive factors and shortcomings of conventional cigarettes, thereby eliminating negative image' of smoking, allowing a habitual smoker to enjoy flavors inherent to cigarettes without the worries of harmfulness, improving the consideration for the health of others, and allowing a smoker to comfortably and gracefully enjoy various cigarette flavors according to his or her own tastes without mental burden such as risk of fire.
Disclosure of the Invention Therefore, the present invention- has been made in view of the above-mentioned aversive factors and shortcomings of conventional cigarettes, and it is an object of the present invention to provide a smoking device which eliminates the negative image of smoking, allows a habitual smoker to enjoy flavors inherent to cigarettes without the worries of harmfulness, removes harmful factors to the health of others, allows a smoker to conveniently and gracefully enjoy various cigarette flavors according to his or her own tastes without mental burden such as risk of fire, and at the same time, solves decisive problems, for example, loss of inherent cigarette flavors and. smoking satisfaction, of conventional cigarette substitutes. In order to accomplish the above object of the present invention, there is provided a smoking device for inhaling gasses and aerosols generated by burning and heating a material, comprising: a body defining an appearance of the smoking device, the body being closed at one side and opened or filled with a filter at the other side; a combustible inserted inside the body, the combustible being continuously burned to generate gasses and aerosols after ignition; and an igniter for initial ignition of the combustible. The combustible is preferably a mixture of shredded tobacco, a combustion aids and an oxygen-supplying material. The combustible itself generates oxygen while being burned without the supply of additional oxygen from the outside. That is, the combustible can be continuously burned using the generated oxygen. In accordance with another aspect of the present invention, there is provided a smoking device for inhaling gasses and aerosols generated by burning and heating a material, comprising: a body defining an appearance' of the smoking device, the body being closed at one side and filled with a filter at the other side; a combustible inserted inside the body, the combustible being continuously burned to generate gasses and aerosols after ignition; an oxygen-supplier for supplying oxygen such that the combustible is continuously burned; and an igniter for initial ignition of the combustible. The body is divided into a body including the filter (hereinafter, abbreviated as a "smoking body") and a body including the combustible (hereinafter, abbreviated as a "combustible body"). The smoking body and the combustible body are rotatably engaged relative to each other. A flavor-generating material capable of generating a flavor by combustion heat released from the combustible is applied on the inner surface of the smoking body.■ The combustible body and the smoking body are formed with respective central apertures through which gasses and aerosols generated by the combustion of the combustible are passed. Further, the combustible body and the smoking body are formed with a plurality of circumferential apertures through which a fragrance generated from the flavor-generating material is passed, respectively. As the smoking body is .rotated in a direction opposite to that of the combustible body, the opening degree between the circumferential apertures is varied. Accordingly, the rotation of the two bodies enables the control of the mixing ratio between the gasses and aerosols generated from the combustible and the fragrance generated from the flavor- generating material.
Brief Description of the Drawings The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: Fig. 1 is a cross-sectional view showing the basic structure of a closed-type smoking device according to the present invention; Fig. 2 is an exploded perspective view of the closed-type smoking device of
Fig. 1; Figs. 3, 4 and 5 are cross-sectional views showing the structure of a closed-type smoking device according to one embodiment of the- present invention which is provided with means for controlling the ratio of gasses and aerosols inhaled; Figs. 6, 7 and 8 are cross-sectional views showing various igniters usable in a smoking device of the present invention; Fig. 9 is a cross-sectional view showing the structure of a closed-type smoking device according to another embodiment of the present invention which is provided with an oxygen supplier; Figs: 10, 11 and 12 are cross-sectional views showing a structure configured to control the amount of oxygen supplied by the oxygen supplier of Fig. 9; and. Fig. 13 is a- diagrammatic view showing a filter-enclosing part of a smoking device of the present invention.
Best Mode for Carrying Out the Invention Detailed description will be made of preferred embodiments of the present invention with reference to the accompanying drawings. Fig. 1 is a cross-sectional view showing the basic structure of a closed-type smoking device according to the present invention, and Fig. 2 is an exploded perspective view of the closed-type smoking device of Fig. 1. The closed-type smoking device of the present invention comprises a body 100 defining an appearance of the smoking device, a combustible 150 inserted inside the body and generating gasses and aerosols upon combustion, an igniter 200 for igniting the combustible, and a filter 120 for filtering the gasses and aerosols. The body 100 is substantially cylindrical. Since the filter 120 is inserted into one side of the body 100 and the igniter 200 is fitted into the other side of the body 100 to separate the inner space of the body 100 from ambient air, problems associated with the evolution of side-stream smoke in conventional cigarettes can be completely solved. Gasses and aerosols generated from the combustion of the combustible 150 are exhausted to the outside (or inhaled by the smoker) only through the filter 120. When filtering is unnecessary, i.e. tar or nicotine is not generated, the filter 120 may be omitted. The body 100 is preferably made of an incombustible or flame-resistant material so that when the combustible 150 is burned, no deformation takes place or no harmful gasses are generated by combustion heat. Glass is preferably used. A holder 102 for fixing the combustible 150 is formed at a predetermined location of the inner side of the body so that the combustible is spaced apart from the inner wall of the body 100 by a fixed distance to form a space 160. Accordingly, since the space 160, the body 100 and an imier cylindrical body 155 block direct delivery of combustion heat released from the combustible 150 to the outside, problems associated with the exposure of the burning section to the outside, i.e. a fire or burns, of conventional cigarettes can be solved. If necessary, an insulation material and a heat-absorbing material may be filled into the space 160. A mixture of a flavor-generating material and an oxygen-generating material may be further filled into the space 160 or applied on the space 160. For example, when the space 160 is filled with peppermint leaves, the smoking device generates a peppermint flavor while absorbing and blocking the generated combustion heat. At the same time, a plurality of intake pores 104 are formed through which the peppermint flavor spreads outside and covers a bad cigarette smell arising from the mouth of the smoker. Accordingly, the smoking device of the present invention can reduce unpleasantness to others. The combustible 150 inserted into the body 100 functions as a fuel generating gasses and aerosols- when a smoker inhales, and may be a combination of shredded tobacco (leaf tobacco cut at a uniform width), sheet tobacco (artificial leaf tobacco obtained by shaping leaf tobacco by-products into a paper form), charcoal and the like. It is preferred that the combustible 150 is continuously burned using air defined in the body 100 without the supply of ambient air. For this purpose, a mixture of an oxygen- generating material and shredded tobacco is preferably added as the combustible. A combustion aids which helps the combustible burn may be further added. Examples of oxygen-generating materials include potassium chloride, potassium perchlorate, potassium nitrate, potassium peroxide and the like. Of these, potassium peroxide is a yellow paramagnetic solid obtained by burning potassium in the presence of a large excess of oxygen. Specifically, potassium peroxide is obtained by slowly passing oxygen through a solution of potassium in ammonia at -50°C until the solution is colorless, or by evaporating an equivalent mixture of potassium hydroxide and hydrogen peroxide in concentrated sulfuric acid under vacuum. U.S. Patent No. 4,867,902 discloses an oxygen-generating microcapsule in which potassium hydroxide is encapsulated. The oxygen-generating microcapsule can continuously and uniformly generate oxygen without the danger of explosion. In the present invention, a mixture of potassium hydroxide and shredded tobacco encapsulated in a microcapsule is used as the combustible 150. Accordingly, the combustible can be burned even in a closed state without the supply of additional oxygen from the outside. The combustible 150 essentially composed of shredded tobacco, the oxygen- generating material and the combustion aids may be shaped into a bar. Alternatively, the combustible 150 may be rolled using cigarette paper, cigar wrapper or "tubular" tobacco (sheet tobacco), like conventional cigarettes. Alternatively, the combustible 150 may be filled into the inner cylindrical body 155. The inner cylindrical body 155 may be made in the form of a wire net, a metal tube, a glass tube or the like. In the case where the combustible 150 includes an oxygen-generating material and a combustion aids, substances harmful to humans may be formed, as previously stated. Accordingly, it is preferred that the combustible 150 is composed of shredded tobacco only, and the oxygen-generating material and the combustion aids are applied on the inner surface of a combustible body 140 so as to be spaced apart from the combustible 150 at a regular interval 160. Accordingly, a smoker can inhale gasses and aerosols generated from the shredded tobacco together with oxygen. Although shredded tobacco has been illustrated as a representative raw material of the combustible 150, it should be understood that a person skilled in the art can use sliredded tobacco analogues, such as mugwort as a smoking cessation product, materials generating aerosols and gasses useful to treat various diseases (particularly, pulmonary diseases), materials for use in aroma therapy, and the like, instead of shredded tobacco. The combustible 150 is continuously burned after ignition, but since the combustible 150 is completely closed from the outside in order to block the formation of side-stream smoke, the igniter 200 must be embedded. Examples of the igniter 200 used to ignite the combustible 150 include battery-powered igniters (mercury, lithium, dry cells, etc.), igniters using electric heating wires, igniters using inflammable chemical substances, electric lighters, . etc. Details concerning these igniters will be described hereinafter. The filter 120 is one commonly used in general cigarettes, and acts to filter gasses or aerosols generated from the combustion of the combustible. However, when harmful substances, including tar and nicotine, are not generated, the filter 120 may be omitted. ■ . The plurality of intake pores 104 formed on the side surface of the body 100 are not essential elements constituting the smoking device. The intake pores 104 having a predetermined diameter help ambient air enter the smoking device in proportion to the inhalation pressure of the smoker. Accordingly, the intake pores 104 allow a smoker to experience smoking enjoyment to a degree similar to a general cigarette. In addition, the intake pores 104 function to release a fragrance generated from the flavor-generating material, and act as passageways through which the combustion heat of the combustible
150 is released, thereby preventing overheating of the body. In this case, the inner cylindrical body 155 is preferably made of a metal tube or glass tube in order to prevent the escape of side-stream smoke. The inner cylindrical body 155 should be adhered closely to the igniter 200 when the igniter 200 is .fitted into the body, and the oxygen- supplying material should be incorporated into the combustible 150. Figs. 3, 4 and 5 are cross-sectional views showing the structure of a closed-type smoking device according to one embodiment of the present invention which is provided with means for controlling the ratio of ga,sses and aerosols inhaled. According to the smoking device of this embodiment, a flavor-generating material 110. is applied on the inner wall of the body 100 such that the flavor- generating material 110. is heated by the combustion heat of the combustible 150 to generate gasses and/or aerosols (hereinafter, referred to as "fragrance"). Accordingly, a smoker can control the mixing ratio between gasses and aerosols generated from the combustible 150 and the fragrance generated from the flavor-generating material 110. For this purpose, the body includes a smoking body 130 and a combustible body 140 separated from each other. Two partitions 132 and 142 are formed between the bodies 130. and 140. The partitions 132 and 142 are formed with a groove 135 and a protrusion 145,. respectively, so that the bodies 130 and 140 are rotatably engaged relative to each other. A pair of central apertures 134 and 144 through which gasses and aerosols are passed are formed at the center of the respective partitions 132 and 142, and a plurality of circumferential apertures 136 and 146 through which gasses and aerosols generated from the flavor- generating material 110 are passed are formed in the vicinity of the respective central apertures. The smoking body 130 is rotated in a direction opposite to that of the combustible body 140 in such a manner that the opening degree between the central apertures 134 and 144 and the circumferential, apertures 136 and 146 is varied. Referring specifically to Fig. 4, the opening degree between the circumferential apertures 136 and 146 is high, but that between the central apertures 134 and 144 is low. According to this structure, a large quantity of aerosols and gasses generated from the flavor-generating material 110 pass through the circumferential apertures 136 and 146. Referring to Fig. 5, the opening degree between the circumferential apertures 136 and 146 is low, but that between the central apertures 134 and 144 is high. Accordingly, a relatively small quantity of aerosols and gasses generated from the flavor-generating material 110 pass through the circumferential apertures 136 and 146. The control of the opening degree between the central apertures 134 and 144 and that between the circumferential apertures 136 and 146 enables the control of the mixing ratio between gasses and aerosols generated from the combustible 150 and fragrance generated from the flavor-generating material 110. Accordingly, a smoker can easily control the cigarette flavor according to his or her own tastes. Although the central apertures 134 and 144 and the circumferential apertures 136 and 146 are shown by triangular forms in Fig. 3, it should be understood that a person skilled in the art can modify the form and arrangement of the apertures. Unlike in the case where the combustible 150 is composed of shredded tobacco only, when the object of the combustible 150. is to, heat the flavor- generating material, that is, the inhalation of gasses and aerosols generated from the combustible 150 is unnecessary, the formation of the central apertures, may be omitted. Figs. 6, 7 and 8 are cross-sectional views showing various igniters usable in the smoking device of the present invention; Fig. 6 is a cross-sectional view of an electric heat-type igniter using a cell. As shown in Fig. 6, the igniter includes a cell 212 for supplying electric power to the igniter, a plurality of ignition pins 214 heated by the electric power supplied from the cell 212, and a switch (not shown) for controlling the power supply. The ignition pins 214 are electric heating wires, and generate heat by the electric power supplied from the cell. Alternatively, the ignition pins 214 are made of a heat conductive material so that the heat generated from the electric heating wires can be delivered to the combustible. Before ignition, the igniter 210 is spaced from the body 100 by a fixed interval. When the igniter 210 is fitted into the body by an external force to turn the switch ON, the ignition pins are heated. The switch may be a sliding switch or push switch. The sliding switch is operated by sliding along with the movement of the igniter 210, and the push switch is operated by being pushed when the igniter is fitted into the body. Since the configuration of switches is well understood by a person skilled in the art, further description is omitted. Reference numerals 215 and 216 denote a fixing protrusion and a fixing groove, respectively, which serve to fix the igniter 210 to the body 100 when the igniter 210 is fitted into the body 100. Fig. 7 is a cross-sectional view of an igniter using chemical substances. A chemical substance generates heat at a high temperature when mixed with another chemical substance. In particular, many chemical substances are widely known to explosively react with oxygen and generate heat at a high temperature. Of these, two chemical substances are selected and used in the present invention. The selected chemical substances 226 and 227 are separated from each other in the initial stage. When a plurality of push plates 222 of the igniter 220 are pushed toward the body, protrusions 223- formed on the push plates 222 rupture a diaphragm 225. This rupture enables the mixing of the chemical substance (A) 226 and the chemical substance' (B) 227 to generate heat at a high temperature. The heat is delivered to the combustible 150 through the ignition pins 214 to ignite the combustible 150. At this time, a receptacle of the chemical substance A (226) is preferably evacuated such that the chemical substance . (B) 227 is rapidly introduced into the receptacle. Fig. 8 is a cross-sectional view of an electric lighter used as the igniter. The electric lighter uses a piezoelectric device for ignition and ignites the combustible by pressing the piezoelectric device. As shown in Fig. 8, the smoking device is provided with a push switch 232 below the body 100, a gas vent nozzle 236 below the combustible 150, and a spark generator 234 in the vicinity of the gas vent nozzle 236. By pressing the push switch, the combustible 150 is ignited. It should, of course, be understood that various modifications are possible other than the three igniter types as described above. Fig. 9 is a cross-sectional view showing the structure of a closed-type smoking device according to another embodiment of the present invention which is provided with an oxygen supplier. In the previous embodiment shown in Fig. 1, the smoking device comprises the oxygen-supplying material for supplying oxygen to the combustible 150, or the oxygen- supplying material applied on the inner surface of the combustible body 140. In this embodiment, the smoking device further comprises an oxygen-supplier"250 for supplying oxygen-containing air to the smoking device. The smoking device according to this embodiment of the present invention comprises a body 100 defining an appearance of the smoking device, a combustible 150 inserted inside the body and generating gasses and aerosols upon combustion, an igniter 200 for igniting the combustible, an oxygen- supplier 250 for supplying oxygen such that the combustible is continuously burned in a closed state, a filter 120 for filtering gasses and aerosols generated from the combustion of the combustible 150, and a flavor- generating material 110 generating a fragrance by combustion heat released from the combustible. As explained in the smoking device shown in Fig. 3, the body 100 includes a smoking body 140 and a combustible body 130 separated from each other so that the mixing ratio between the gasses and aerosols generated from the combustible 150 and the fragrance generated from the flavor-generating material 110 can be controlled. The combustible 150 may be pure shredded tobacco, or a mixture of shredded tobacco and a combustion aids. Since the smoking device comprises the oxygen- supplier 250, an oxygen-supplying material is not required. Igniters which can be used in the embodiment include those shown Figs. 6 to 8. In this embodiment, the igniter using chemical substances shown in Fig. 7 is used as the igniter 220, as shown in Fig. 9. The oxygen supplier 250 includes an oxygen receptacle 260 and an oxygen supply tube 262. Exemplary gas and liquids included in the oxygen receptacle 260 include compressed air, liquefied air, liquefied oxygen, liquefied oxygen, liquid oxygen, and oxygen-containing gas and liquid mixtures. The purity of oxygen can be controlled considering the combustion speed of the combustible 150. Oxygen is supplied using the oxygen supplier 250 by an operator. At this time, it is preferred that the igniter is concurrently operated. Like the operation of the igniter, the oxygen supply is initiated by fitting a portion exposed to the outside of the body into the body. As can be seen from Fig. 5, the oxygen supplier 250 is formed at one end of the body 140 together with the igniter 220, but the location of the oxygen supplier 250 is particularly not limited. For example, the oxygen supplier 250 is disposed in a space
160 formed between the combustible 150 and the body 100. It should, of course, be understood that various modifications to the location of the oxygen supplier are possible. Figs. 10, 11 and 12 are cross-sectional views showing a structure configured to control the amount of oxygen supplied by the oxygen supplier of Fig. 9. Fig. 10 shows a state before the smoking device is used, and Fig. 11 shows a state after ignition of the smoking device. When the oxygen supplier 250 is fitted inside the combustible body 140, the push plates 222 of the igniter 220 at the upper side of the oxygen supplier rupture the diaphragm 225 to mix the chemical substances 226 and 227, thereby generating heat. The generated heat ignites the combustible 150, and simultaneously an operation pin 270 is thrust into the oxygen receptacle. The operation pin 270 pushes a cover plate 280 closely sealing the oxygen supplier 250. One end of the cover plate 280 is firmly adhered to an upper wall of the oxygen receptacle, and the other end is relatively weakly adhered to the upper wall of the oxygen receptacle. When the cover plate is pushed by the pin 280, it is thrust into the oxygen receptacle. After oxygen supply begins, the amount of the oxygen supplied can be controlled as follows. An auxiliary supply tube 264 inclinedly formed on the oxygen supply tube 262 is initially open halfway. When the lower side of the oxygen supplier 250 exposed to the outside of the combustible body 140 is rotated, the oxygen supply tube 262 ascends or descends along a thread line to increase or decrease the opening degree of the auxiliary supply tube 264. Accordingly, a great deal of oxygen can be supplied to the combustible through a vertical oxygen supply tube 263. This configuration of the oxygen supplier allows a smoker to control the amount of oxygen supplied according to his or her own smoking habits. The oxygen supplier is provided with an inhalation plate 275 formed on the operation pin 270, which is fixed by a spring 280. When a smoker inhales, the inhalation plate 275 moves upwardly. Referring again to Fig. 10, the operation pin 270 is formed with a conical protrusion. When the operation pin 270 moves upwardly together with the conical protrusion, the conical protrusion reduces the resistance to a gas, e.g., oxygen, supplied from the oxygen supplier and thus a great deal of oxygen can be inhaled by the smoker. The inhalation plate 275 is not an essential element constituting the smoking device. It is apparent to a person skilled in the art that since the operation pin 270 can move upwardly by a negative pressure applied only to the protrusion, the same effects as the inhalation plate 275 are achieved. Since the rotation of the oxygen supplier allows a smoker to control the amount of oxygen supplied depending on various preferences of the smoker, the smoking device of the present invention can overcome the limitations (e.g. fixed air dilution rate) of conventional cigarettes. In addition, since the smoker can inhale a great deal of oxygen upon smoking, the smoker can enjoy smoking enjoyment to a degree similar to a general cigarette. In this embodiment, since the igniter 220 releasing heat and the oxygen supplier 250 are adjacent to each other, an insulation material is preferably interposed between the igniter 220 and the oxygen supplier 250 to prevent overheating of the oxygen supplier 250. More preferably, both the igniter 220 and the oxygen supplier 250 are made of an insulation material. The object of the smoking device according to this embodiment is to control the amount of oxygen supplied from the oxygen supplier 250. It should be understood that various modifications are possible, hi addition, general structures, such as portable butane containers, can be used in the present invention so long as a uniform amount of oxygen can be supplied only by pressing. Fig. 12 is a horizontal cross-sectional view showing the arrangement of the ignition pins 214, the push plates 222 and the inhalation plate 275. As shown in Fig. 12, the igmtion pins 214 and the push plates 222 are arranged in such a manner that they form different concentric circles, thereby overcoming problems associated with the small space. Fig. 13 is a diagrammatic view showing a filter-enclosing part of the smoking device of the present invention. As shown in Fig. 13, the filter-enclosing part 300 has the same plane as the body, and is extended toward the rear of the filter 120. The filter-enclosing part 300 hermetically seals a portion of the filter exposed to the outside to prevent a bad smell of the filter 120 after smoking from spreading. The filter-enclosing part 300 is preferably made of a shape memory material. As the combustible is burned and the burning location is closer to the filter 120, the filter-enclosing part 120 seals the filter by heat released from the combustible. The filter-enclosing part 120 may be made of a relatively hard paper and thin metal plate capable of being bent sufficiently to enclose the filter by hand. 13-a (left of Fig. 13) illustrates an initial shape memorized by the filter- enclosing part 300. The central part of the filter-enclosing part 300 is lower than the upper surface of the filter. This is to closely adhere the filter- enclosing part 300 to the filter 120. 13-b (center of Fig. 13) illustrates the initial state and a state during smoking. 13-c (right of Fig. 13) illustrates a state where the combustion heat released from the combustible is delivered to the filter-enclosing part 300 to change the shape of the filter- enclosing part 300 into the initially memorized shape and to permit the filter-enclosing part 300 to enclose the filter.
Industrial Applicability As apparent from the above description, since the closed-type smoking device of the present invention uses shredded tobacco and additives, including a combustion aids and an oxygen-supplying material, separated from the shredded tobacco, it can reduce a possibility of formation of harmful substances due to chemical reactions between shredded tobacco and additives. Since the closed-type smoking device can reduce the formation of side-stream smoke evolved during burning a raw tobacco, it minimizes the damage of second-hand smoke. Since flame is not spread outside the closed-type smoking device after ignition, it does not cause the risk of causing a fire or burns. In addition, the closed-type smoking device of the present invention is convenient to use and allows a smoker to conveniently enjoy smoking without the need of a lighter and an ashtray. Using the closed-type smoking device, a smoker can easily control the amount of air and a fragrance inhaled according to his own tastes. Furthermore, since the closed-type smoking device of the present invention is provided with a filter-enclosing part to hermetically seal the filter opening, it can prevent a bad smell of the filter 120 after smoking from spreading. In conclusion, the closed-type smoking device of the present invention minimizes direct and indirect damages to the smoker and others, allows the smoker to comfortably enjoy various cigarette flavors without mental and physical burdens, and is advantageous in terms of cleanness. Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.