A portable toilet stool

Abstract: The upper opening (2) of the toilet stool is effectively closed by an air-curtain formed by currents of air flowing over the opening (2), so that the smell of feces (14) evacuated into the stool is prevented from freely rising into the ambient air from the upper opening (2). The smell is forcibly subjected, within the stool, to deodorizing and/or decomposition, and is discharged into the atmosphere or circulated within the stool for a predetermined period of time.

Description: This invention relates to a portable toilet stool or bowl which can arrest within the stool the smell of feces discharged into the stool and which can effectively deodorize them. Old people who grow physically weak while they are mentally normal and can intend to evacuate, physically handicapped people, and patients suffering from diseases or accidents, can hardly go to the toilet, and are compelled to use a portable stool or bowl beside their beds. Since this kind of portable stools are used just beside beds, they are generally simple and bucket-shaped. Accordingly, the smell of feces discharged into such bucket-shaped stool displeases persons who work to dispose of them. It displeases other patients and attendants too. Those people and patients who are compelled to use stools of such simple structures, feel mental: pain themselves. Since stools in which feces were discharged, can hardly be cleaned in no time, on account of shortage of hands today, such displeasure and pain become worse. Therefore, in order to lessen the smell of feces, a stool is sometimes filled with water about half, and they are dropped into the water. This can not, however, shut off completely the smell of feces, but this makes the stool heavy, resulting in making it more laborious to handle the stool. Lately, bucket-shaped stools in which deodorizers are installed, and other stools having structures by which the smell of feces can partially be sucked, have been in the market. Although such stools are a little effective for reducing the smell when they are being used, as buttocks are located above the upper opening of stools so as to close it, they are ineffective, afterwards, because the smell evaporates from the upper opening and escapes outside, whereby it can not be deodorized. In view of the above, it would be desirable to be able to provide a stool which can shut off the smell of feces within the stool when it is used and even after it has been used, so that it can not escape outside, but can effectively be deodorized. EP-A-0 331 192 discloses a portable stool in accordance with the preamble of claim 1. The present invention provides a portable stool as set forth in claim 1. In a preferred embodiment the air sucked with the smell into the air passage is decomposed by an ozonizer located in the air passages, deodorized when it is passed through adsorption layers filled with adsorbents such as activated carbon and the like, and discharged from an exhaust opening as an odorless air. THE DRAWINGS Fig. 1 is an explanatory sectional side view of an embodiment of a portable stool not in accordance with this invention, and having deodorizing and air-curtaining efficiencies; Fig. 2 is a plan view of the stool shown in Fig. 1; Fig. 3 is an explanatory sectional side view of another embodiment of a portable stool not in accordance with the invention; Fig. 4 is an explanatory plan view of Fig. 3; Fig. 5 is an explanatory sectional side view cut along the line A-A in Fig. 6, of an embodiment of a portable stool in accordance with the invention having deodorizing and air-curtaining efficiencies and provided with a double bucket or pair of buckets; Fig. 6 is a plan view of the portable stool shown by Fig. 5, in which a seat closes the upper opening of stool; Fig. 7 is a plan view similar to Fig 6, but the seat is lifted up; Fig. 8 is an explanatory sectional side view of mother embodiment of the portable stool in accordance with the invention, cut along the line B-B in Fig. 9, which is provided with a double bucket or pair of buckets, and in which the air-suction opening is located only at the rear side of the upper opening; Fig. 9 is a plan view of the portable stool shown by Fig. 8; Fig. 10 is an explanatory sectional side view of further other embodiment of the portable stool of this invention cut along the line C-C in Fig. 11, which is provided with a double bucket or pair of buckets, and in which the air-suction opening is located only at the front side of the upper opening; Fig. 11 is a plan view of the portable stool shown in Fig. 10; and Fig. 12 is an explanatory front view of a stool, a conventional bucket installed in the stool, and a pair of buckets which are to installed in the stool in accordance with the invention in place of the conventional bucket. With reference to Figs. 1 and 2 which show an embodiment of a portable stool not in accordance with this invention, a stool body 1 as a whole, has a vertically erected tubular shape which is provided at its upper surface with an oval opening 2. On the upper surface of the stool body 1 and adjacently to a rear end of the transverse axis of the oval opening 2, there is fixed a hinge 3 about which a seat 3 and lid 5 are fitted so that they can be freely erected or brought down over the oval opening. A bucket 6 which receives therein feces is removably fitted into the stool body so that its upper opening lies under the oval opening 2 of the stool body. As outwardly extending upper flanges 6a of the bucket 6 are hung over a support ridge 7 which locates below the upper surface of the stool body, there is produced a horizontally extending narrow space between the upper opening of the bucket and the oval opening of the stool body. Numeral 8 indicates a horizontally extending narrow air-suction opening which is provided to the stool body adjacently to the rear end of the transverse axis of the oval opening 2, and which connects to an air-suction passage 9 partitioned within the stool body 1 and to an exhaust opening 10 located at an lower side of the stool body. An electric suction fan 11 which is fitted intermediately in the air-suction passage 9, has a strong suction force so as to produce an air-curtain which can prevail completely over the upper oval opening 2 of the stool body 1. An ozonizer 13 is located above the suction fan 11, while below the suction fan there is installed adsorption layers 12 such as a replaceable cartridge filled with activated carbon and the like. Although Figs. 1 and 2 do not illustrate, the air-suction fan 11 and ozonizer 13 are operated by an outer electric source through an on/off operation of a switch. When a person sits on the seat 4 of the stool, they may be operated automatically in response to his weight, and they may be kept operated for a while even after the person left the stool. The portable stool having the above-mentioned structures operates as follows. When a person brings down the seat 4 and sits down on it for the evacuation, the fan 11 and ozonizer 13 operate. Then, as the upper oval opening 2 of the stool is closed by his buttocks, there is produced a compulsory current of air, whereby the air within the bucket 6 is sucked by the air-suction opening 8, passed through the air passage 9, and discharged outside from the lower exhaust opening 10. Thus, the smell of feces 14 discharged in the bucket is forcibly led into the air passage 9 where it is decomposed by ozone of the ozonizer 13 and succeedingly deodorized by the adsorption layers 12. And, as the fan 11 and ozonizer 13 continue to operate even after stool, the aforementioned air-curtain produced by the fan completely shuts off the smell from the outside. The feces 14 left in the bucket 6 may easily be disposed of, as the bucket is simply suspended within the stool body and can readily be taken out from the stool body. In another embodiment of a portable stool not in accordance with this invention and illustrated in Figs. 3 and 4 , the compulsory current of air which forms the air-curtain over the oval opening of the stool, is continuously circulated through the stool. In Figs. 3 and 4, numeral 15 indicates a horizontally extending narrow air-blowing opening which is located at the opposite side of and at the same height of the air-suction opening 8. In this instance, air in a space between the user's buttocks and the upper opening of bucket 6, is sucked by the fan 11 into the passage 9 via the air-suction opening 8, subjected to the ozonizer 13 and the adsorption layers 12 whereby it is decomposed and deodorized, passed through an air-discharge passage 16 formed between the inner bottom of the stool body 1 and the outer bottom of the bucket 6, flown toward the air-blowing opening 15, and blown all over the bucket as long and narrow currents of air. This currents form an air-curtain which shuts off the upper opening of the bucket from the outside. As the currents absorb the smell of feces 14, it is decomposed and deodorized while the currents of air circulate within the stool. In Fig. 3, numeral 17 indicates a controller fitted at a corner within the stool body, which is electrically connected at one end to an electric source and at another end to the fan 11 and ozonizer 13, so that when the lid 5 is open or when a person sits down on the seat 4, the fan and ozonizer operate while the stool is used and for a predetermined additional period of time. In Figs. 5 to 7, there is shown an embodiment a portable stool according to this invention. In this embodiment, a deodorizing outer bucket 18 is removably fitted into the stool through its upper opening and by means of engagement projections 21 (as best shown in Figs. 8 and 10), while in turn, an inner bucket 19 for receiving feces which is a little smaller than the deodorizing outer bucket 18 is removably fitted into the deodorizing outer bucket 18 by means of engagement projections 22 (as best shown in Figs. 8 and 10). A cylindrical air passage 23 formed between the two buckets, opens at its upper end with the air-suction opening 8, and connects at its bottom to an air-discharge tubular opening 20 provided at the bottom of the deodorizing outer bucket. The discharge opening is, similarly to the other embodiments, fitted with the air-suction electrical fan 11, means 12 for deodorizing the smell of feces, and/or means 13 for decomposing the smell. In the embodiment shown in Figs. 5 to 7, as best shown in Fig. 6, the air-suction openings 8 are provided at upper four corners of the stool, while in the embodiment illustrated in Figs. 8 and 9, only a single air-suction opening 8 is provided at a rear upper corner of the stool, as best shown in Fig. 9, whereby an air-curtain is formed by currents of air covering all over the upper opening 2 of the stool and flowing toward the rear corner, resulting in preventing the smell to leak outside. As shown in Figs. 10 and 11, a single air-suction opening may be provided only at the front corner of the stool, so that the air-curtain covering the upper opening 2 may flow toward the front corner. Likewise, the air-suction opening may be provided at the rear and front corners, or at the left and right corners. As shown in Fig. 12, if a conventional bucket 24 is replaced by the buckets 18 and 19, a conventional toilet stool can be modified to the one in accordance with this invention having deodorizing and air-curtaining efficiencies.

Claims: A portable toilet stool comprising: a stool body (1) having an upper opening (2) for receiving waste therethrough; a first bucket (18) disposed within the stool body (1); and an air suction fan (11) arranged to form an air curtain near the upper opening (2); characterized in that : a removable second bucket (19) for receiving waste which enters the stool body (1) through the upper opening (2) is disposed within the first bucket (18) with a space therebetween to create an air passage (23) having an inlet or inlets (8) adjacent the open upper end of the second bucket (19) and having an outlet (20); and the air suction fan (11) is arranged to draw air into the air passage (23) through the inlet or inlets (8) so as to form the air curtain near the upper opening (2), the air leaving the air passage (23) through the outlet (20). A portable stool as claimed in claim 1, in which the suction fan (11) is fitted in the air passage (23). A portable stool as claimed in claim 1 or 2, in which the air passage (23) is provided with means for deodorizing the air, preferably an adsorbent (12), in particular comprising activated carbon. A portable stool as claimed in any preceding claim, in which the air passage (23) is provided with means for decomposing the air, preferably an ozonizer (13). A portable stool as claimed in any preceding claim, in which the stool body is a tubular body (1) having an upper opening (2) which is substantially oval-shaped, a seat (4) and a lid (5) being pivoted to the body (1) adjacently to an end of the oval-shaped upper opening (2), and in which there is a horizontal space between the removable second bucket (19) and the oval-shaped upper opening (2), the space providing a path for the air-curtain prevailing across the oval-shaped upper opening (2).

Inventors: ARISA HARUHIRO, FUJITA ATSUMI, SAKUMA TETSUO, SASAKI HIDEO, ARISA, HARUHIRO, FUJITA, ATSUMI, SAKUMA, TETSUO, SASAKI, HIDEO, Arisa, Haruhiro, Atsugi Co., Ltd., Fujita, Atsumi, Atsugi Co., Ltd., Sakuma, Tetsuo, Atsugi Co., Ltd., Sasaki, Hideo, Atsugi Co., Ltd.
Applicants: ATSUGI CO LTD, ATSUGI CO. LTD.
Application year: 1999
Main classification: A47K11
IPC codes: A47K11