WATER CLOSET BLOWING WARM AIR AND WATER CLOSET UNIT ATTACHABLE TO TOILET ROOM

Abstract: A sitting type water closet (1), comprising a toilet bowl (2), a warm air duct (4) which has a warm air outlet (5) disposed, on a lower outside portion of the bowl, backwardly in a direction of the rear portion of the bowl from the tip of the bowl, and conveys the warm air to a front portion of the bowl (2); and a warm air guiding groove (8) which extends from the ward air outlet (5) to the tip of the bowl, and has a width gradually broadened out toward the tip. Further, a water closet unit capable of attaching the same to a toilet room and blowing warm air out, comprising: an adapter (49) having a means for fixing the adapter to the toilet room, and a warm air generator (12); and a sitting type water closet (1) having a warm air duct (4) for conveying the warm air from the generator (12) to a space in front of the water closet; the water closet being attached at the rear portion thereof to the adapter (49), and furthermore, a prefabricated toilet room unit including the above water closet unit and also disclosed.

Description: The present invention relates to a sitting type water closet blowing warm air, and a water closet unit which can be installed in a toilet room. The term "sitting type water closet" used herein means a water closet utilized by sitting directly on a toilet seat thereof, and includes a bench type water closet (i.e., a water closet fixed on a side wall of a toilet room at a rear side of the water closet), a stool type water closet (i.e., a water closet mounted on a floor of the toilet room), a water closet fixed on the side wall and floor of the toilet room, and so on. A warmed toilet seat is widely used to improve comfort. US-A-4,071,915 discloses a water closet seat provided with long holes for blowing hot air to warm it rapidly. Recently, a portable electric heater is often furnished in the toilet room to warm the room as a whole. Further, an air-conditioner such as a heat pump type air-conditioner is sometimes provided in the toilet room. However, the toilet room cannot be wholly warmed by using a heatable toilet seat. The electric heater should be turned off for prevention of fire, when the toilet room is not used. The electric heater is not convenient to warm the toilet room as a whole. There is a possibility to burn user's clothes if the electric heater is too close. The heating effect is rapidly reduced as the distance between the user and the heater is increased. When the toilet room is small, it is impossible to separate the heater from the user sufficiently. Thus, the power of the heater must be low, and the heating effect is insufficient. When an air-conditioner, such as a heat-pump type air-conditioner, is used to warm the whole toilet room, it may be that the upper portion thereof is warmed but the lower portion close to the legs of the user is warmed insufficiently. In Japan, there has been a recent increase in the numbers of house provided with so-called western-style water closets (i.e., sitting type water closets) instead of Japanese-style water closets (i.e., a toilet tub in the form of a depression in the floor). The western-style water closet includes the bench type. The western-style bench type water closet is attached to the wall of the toilet room to the rear side of the water closet. In the case of a concrete building, the western-style bench type water closet can be firmly attached to a front wall of a counter which is mounted on the wall of the toilet room. In the case of an ordinary house, however, the wall is usually made of panels or wooden plates having a relatively low strength. Thus, the western-style bench type water closet can not be firmly attached to the wall. The inventors of the present invention found that warming can be effectively performed by applying warm air mainly to the legs of the user of the water closet. The inventors further completed an adapter which may firmly and easily attach the bench type water closet (which has a warming device using warm air), to the toilet room, even on a wall made of panels or wooden plates having a relatively low strength. Accordingly, the object of the present invention is to provide a sitting type water closet having a means for applying warm air to the user's leg region. Another object of the present invention is to enable such a water closet, particularly a bench type water closet to be mounted to a wall of a toilet room. Other objects and advantages of the present invention will be apparent from the following description. In accordance with the present invention, there is provided a sitting-type water closet comprising: a toilet bowl and at least one warm air duct; characterized in that the warm air duct has a warm air outlet opening outside the toilet bowl at a lower portion thereof; and a warm air guiding groove which extends from the warm air outlet to the front of the bowl with a width gradually broadening toward the front, so as to guide the warm air to the area in front of the bowl. Generally at least a terminal portion of the warm air duct extends along the lower portion of the toilet bowl toward the front portion of the bowl, and the warm air outlet at the end of the duct is disposed a given distance from the front of the bowl. Further, the warm air guiding groove extends on the lower outside of the bowl from the warm air outlet to the front of the bowl, to thereby convey the warm air from the outlet to the front space of the water closet. In the water closet according to the present invention, therefore, the warm air is blown out from the front portion thereof, and thus, a user can be warmed mainly around the legs. Because the warming is carried out with warm air, there is no possibility to burn the user's clothes. If the warm air continues to be blown out when the toilet room is not used, it is possible to heat the whole room. Therefore, the water closet may be very comfortably employed, particularly in a low temperature season, e.g., winter. During the humid season e.g., the rainy season, it is possible to avoid dew condensation on the water closet by blowing the warm air out. Since the outlet at the end of the warm air duct is spaced rearwardly of the front of the bowl, if urine or foul water is splashed on the front outer surface of the toilet bowl it will not enter the warm air duct. Therefore, it may be avoided that the foul water dries up in the warm air duct and becomes malodorous. Even if some dried foul water does collect on the roof or the side wall in the warm air duct, it may be easily removed by wiping. Further, the water closet of the present invention has the groove which guides the warm air blown out from the outlet of the warm air duct, and is broadened in the direction of the front portion of the bowl. Therefore, the warm air is blown out at a wide angle. Thus, the water closet of this invention can certainly warm the lower half of the user, particularly the calves, independently of the configuration of the legs of the user. Further, in accordance with the present invention, there is also provided a water closet unit which can be attached to a toilet room, said unit comprising: an adapter having a means for fixing the adapter to the toilet room, and a warm air generator; and a sitting type water closet having a toilet bowl and a warm air duct for conveying warm air from the generator to a space in front of the water closet; the bowl being attached at the rear portion thereof to the adapter. The term "front" as in "front portion" or "front space" as used herein with respect to the water closet or bowl means the direction in which the user faces. Thus, the term "rear" as used herein means the direction of the users back. Some embodiments of the invention will now be described in greater detail with reference to the accompanying drawings in which: Fig. 1 is a side elevation view of a first embodiment of the water closet according to the present invention, Fig. 2 is a sectional view taken on line II-II of Fig. 3, Fig. 3 is a front view of Fig. 1, and Fig. 4 is sectional view taken on line IV-IV of Fig. 1. Fig. 5 is a side elevation view of a second embodiment of the water closet according to the present invention, and Fig. 6 is a front view of Fig. 5. Fig. 7 is a side elevation view of a third embodiment of the water closet according to the present invention, Fig. 8 is a sectional view taken on line VIII-VIII of Fig. 9, and Fig. 10 is a sectional view taken on line X-X of Fig. 7. Fig. 11 is a side elevation view of a fourth embodiment of the water closet according to the present invention, Fig. 12 is a front view of Fig. 11, and Fig. 13 is a sectional view taken on line XIII-XIII of Fig. 11. Fig. 14 is a front view of a fifth embodiment of the water closet according to the present invention, and Fig. 15 is a sectional view of Fig. 14. Fig. 16 is a front view of a sixth embodiment of the water closet according to the present invention, and Fig. 17 is a sectional view thereof. Fig. 18 is a front view of a seventh embodiment of the water closet according to the present invention, and Fig. 19 is a sectional view thereof. Fig. 20 is a front view of a eighth embodiment of the water closet according to the present invention, and Fig. 21 is a sectional view thereof. Fig. 22 is a side elevation view of a ninth embodiment of the water closet according to the present invention, Fig. 23 is a front view of Fig. 22 and Fig. 24 is a sectional view taken on line A-A of Fig. 23. Fig. 25 is a perspective view of a lower portion of one embodiment of the water closet of the present invention, Fig. 26 is a front view of the water closet, Fig. 27 is a rear view thereof, Figs. 28, 29 and 30 are sectional views taken on lines IV-IV, V-V and VI-VI of Fig. 27, respectively, and Figs. 31, 32, 33, 34 and 35 are sectional views taken on lines VII-VII, VIII-VIII, IX-IX, X-X, and XI-XI of Fig. 30, respectively. Fig. 36 is a sectional view of still another embodiment of the sitting type water closet according to the present invention. Fig. 37 is a sectional side view of a first embodiment of the present water closet for preventing trap water from freezing, Fig. 38 is a sectional view taken on line IV-IV of Fig. 37. Figs. 39 and 40 are sectional views of other embodiments of the present water closet for preventing trap water from freezing. Figs. 41 and 42 are side elevation views schematically illustrating a manner wherein a water closet unit embodying the present invention may be installed in a toilet room Fig. 43, is a front view of the water closet shown in Fig. 42 as a sectional view, Fig. 44 is a sectional view taken on line IV-IV of Fig. 43. Fig. 45 is a sectional plan view illustrating a manner wherein the sitting type water closet unit may be installed in the toilet room, Figs. 46 and 47 are setting-up perspective views of the water closet unit. Fig. 48 is a perspective view showing upwardly a lower portion of a structure fixing the warm air generator to the water closet. Fig. 49 is a side elevation view schematically illustrating another manner wherein the sitting type water closet is installed in the toilet room. Figs. 50 and 51 are sectional plan views illustrating the manner wherein the water closet unit is installed in the toilet room, using a specific fixing plate, Fig. 52 is a setting-up perspective view of Figs. 51 and 52, Figs. 53 and 54 are perspective views of the embodiment of the fixing plates. Fig. 55 is a sectional elevation view schematically illustrating the manner wherein the present water closet unit including the warm air outlet is posed on the side wall of the adapter is installed in the toilet room, Fig. 56 is a sectional plan view thereof, Fig. 57 is a sectional view taken on line III-III of Fig. 56, Figs. 58 and 59 are setting-up perspective views thereof, and Fig. 60 is a perspective view of the water closet and the warm air generator. Fig. 61 is a plan view of the seat switch, Fig. 62 is a front view thereof, Fig. 63 is a sectional view thereof, Fig. 64 is a block diagram of the control system of the embodiment wherein the seat switch is used, Figs. 65 and 66 are flow charts thereof, and Fig. 67 is a time chart thereof. Figs. 68 and 69 are side elevation views schematically illustrating the manner wherein the water closet unit having the seat switch as another embodiment of the present invention is installed in the toilet room, Fig. 71 is a side elevation view of a leg heater, Fig. 72 is a plan view thereof, Fig. 73 is a block diagram of the built-in control circuit of the control panel, Fig. 74 is a flow chart of another actuation of the leg heater in the control circuit, and Fig. 75 is a flow chart of still another actuation of the leg heater in the control circuit. Fig. 76 is a graph showing the relationship between the surface temperature of a positive thermistor cell (hereinafter referred to as PTC) heater and a ratio of resistance at a given temperature to that at 25°C, Fig. 77 is a sectional elevation view schematically illustrating the manner wherein the water closet unit using an intake vent for the outside air is installed in the toilet room and Fig. 78 is a graph showing the relationship between the temperature of the outside air, and a heat release value and the temperature at the outlet. Fig. 79 is a sectional elevation view illustrating the manner wherein the water closet unit containing a safety means as an embodiment of the present invention is installed in the toilet room, Fig. 80 is an electrical circuit diagram of an on-off control of a first PTC heater and a second PTC heater, Fig. 81 is a graph showing the relationship between the temperature of the PTC heater and the resistance, Fig. 82 illustrates the manner disposing temperature fuses. Fig. 83 illustrates the setting-up of the main part of an embodiment of the present invention wherein a wholly heating device is further disposed, Fig. 84 shows an enlargement of the main part in Fig. 83, Fig. 85 is a front view of an air-conditioner, and Fig. 86 is a sectional elevation view thereof. Typical embodiments of the present invention will be explained hereinafter referring to the drawings. Figs. 25 to 35 show one embodiment of the present invention. The sitting type water closet 1 shown in Fig. 25 is of bench type, and attached to the wall of the toilet room or the like at the rear side 1a. The water closet 1 contains the toilet bowl 2 in the front portion, and the rim water conduit 3 is disposed in the upper portion of the bowl 2, surrounding the bowl 2 (refer to Figs. 26 to 30. etc.). In the bench type water closet 1, a pair of warm air ducts 4 is disposed integrally with the toilet bowl 2, longitudinally extending along the curved surface of the lower portion of the bowl 2. The warm air duct 4 has an opening, i.e., the warm air outlet 5 which is spaced rearwardly of the front of the bowl (at the position slightly forward from the trap 6 in this embodiment as shown) (refer to Fig. 28). The other end of the warm air duct 4 is an opening 9 on the rear side 1a of the water closet 1 (refer to Figs. 27 and 29). A groove 8 extends from the outlet 5 to the front and lower portion of the bowl 2, and may guide the warm air from the outlet 5 to the front space of the water closet 1. As shown in Figs. 25 to 28, the width of the groove 8 is rarely or not changed in a portion B between the outlet 5 and an intermediate point A. However, the width is gradually broadened in a front portion C beginning from the intermediate point A to the front portion of the water close 1. The water closet 1 shown in Fig. 25 has drainage holes 7, holes 10 for the bolts to attach the water closet 1 to the wall of the toilet room or the like, holes 11 for the bolts to attach the toilet seat (refer to Fig. 41 etc.), and water supply inlet 13 (refer to Fig. 26, etc.), and the like. As shown in Fig. 25, the rear end opening 9 of the warm air duct 4 is connected with, for example, the warm air generator 12, to supply warm air to the warm air duct. In the sitting type water closet 1 of the above structure, the warm air from the warm air generator 12 is emitted from the outlet 5, conducted along the guiding groove 8, and widely blown out from the front end of the groove 8, whereby the lower half of the body, particularly the calves, of the user of the water closet 1, is warmed with the warm air. Although the width of the guiding groove 8 is gradually broadened in the front portion C from the intermediate position A in the embodiment shown in the above figures (particularly, Fig. 28), the width may be gradually broadened immediately after the outlet 5. To avoid an internal focusing of the warm air blown out from the tip D of the water closet, the direction of the groove 8 is biased to the center of the bowl in the portion B between the outlet 5 and the intermediate position A, as shown in Fig. 28. In the embodiment as shown in Figs. 25 to 35, the width of the groove 8 is preferably about 50 to 100 mm at its downstream mouth (i.e., the position shown with the arrow D in Fig. 28) where the warm air leaves the water closet 1, when the width of the outlet 5 is about 40 mm, and a widening angle at the downstream mouth of the groove 8 is preferably about 5 to 20° (refer to Fig. 28). Although the embodiment shown in Figs. 25 to 35 is the bench type water closet, the present invention may be applied to various water closets, such as the stool type water closet, or the water closet installed on the floor and fixed on the wall of the toilet room. According to the preferred embodiment of the present invention, the warm air duct is horizontal or slopes downwards toward the warm air outlet. In this embodiment, the foul water is not introduced into the warm air duct, even if the foul water reaches the warm air outlet. Therefore foul water will not become dried in the warm air duct 4 and become malodorous. For example, as shown in Fig. 36, the warm air duct 4 is horizontal or downwardly sloping in the direction from the rear opening 9 to the outlet 5. In the embodiment as illustrated, it is horizontal in the portion 4a near to the outlet 5. The portion 4a may be downgrade. Alternatively, the warm air duct 4 as a whole may be horizontal or slope down. Further, as shown in Fig. 36, a raised portion 8a for protection against water may be disposed on the roof and/or the side wall of the groove 8, thereby preventing the foul water from approaching the outlet 5. In still another embodiment of the sitting type water closet according to the present invention, the warm air path (comprising the warm air duct and the guiding groove) shares at least a part of the wall of the toilet bowl at a the level of the sink water surface in the toilet bowl. The warm air passing through the warm air path can heat the trap water at the surface level thereof, thereby preventing the trap water from freezing, particularly in a cold district. The freezing of the trap water beings from the surface thereof. Therefore, the freezing of the trap water may be avoided by heating the water around the surface level thereof in the toilet bowl of the water closet according to this embodiment. Figs. 37 and 38 illustrate a first embodiment of the water closet for preventing the trap water from freezing. The water closet 1 shown in Figs. 37 and 38 is a bench type closet, and attached to the wall of the toilet room or the like at the rear side 1a. The reference numerals in Figs. 37 and 38 have the same meanings as given in Fig. 1 and the like. As shown in Fig. 38, the warm air duct 4 shares the wall thereof with the toilet bowl 2 on the right and left sides thereof, whereby the warm air passing through the warm air duct 4 directly heats the toilet bowl 2, particularly around the surface level L of the trap water W. Therefore, the freezing of the trap water may be avoided. Figs. 39 and 40 illustrate other embodiments of the water closet for preventing the trap water from freezing. The warm air path in the bench type water closet 1 of this embodiment comprises the warm air duct 4 and the guiding groove 8. As shown particularly in Fig. 39, the guiding groove 8 shares the upper wall 8b thereof with the bottom wall of the toilet bowl 2, whereby the warm air in the guiding groove 8 directly contacts the bowl surface opposite to the trap water W around the level L. It should be understood that the detailed description with reference to Figs. 25 to 40 is given by way of illustration only. For example, the number of warm air outlets and/or the direction of blowing the warm air out, may be different from those shown in Figs. 25 to 40. The warm air path may have, for example, the sectional profile as shown in Fig. 40. Further, the water closet may be of bench, stool, or other type. The present invention also relates to a water closet unit containing an adapter which can attach the sitting type water closet having the warm air path to the wall of the toilet room. The water closet unit according to the present invention may blow the warm air out from the front portion thereof, thereby heating the legs of the user. Since the heating is effected with warm air, the clothes will not be burnt. In using the water closet unit according to the present invention, a bench type water closet may be attached to the wall of the toilet room with an adapter, and thus, the fixing strength may be much improved, even if the wall of the toilet room is made of a material of low strength, such as a wooden plate. Figs. 41 to 44 schematically illustrate the water closet unit according to the present invention. The sitting type water closet 1 is of bench type, and attached at the rear side 1a thereof to the adapter 49 installed in the wall portion of the toilet room 20. The rim water conduit 3 is disposed around the upper portion of the toilet bowl 2 (Fig. 42). In the water closet 1, the warm air duct 4 composing the warm air path 14 is longitudinally disposed at the side portion thereof, formed integrally with the toilet bowl. The end of the warm air duct 4 is an opening, i.e., the outlet 5, at the tip of the water closet 1. The rear end of the warm air duct 4 is an opening at the rear side 1a of the water closet 1. The water closet 1 has the trap 6 and the drainage hole 7. A toilet seat 22 and a toilet cover 23 are disposed on the upper portion of the water closet 1 so that the closet can be opened and closed with the seat and the cover. The toilet seat 22 and the toilet cover 23 are rotatably fixed with a hinge shaft 25 to a case 24 mounted on the upper rear portion of the water closet 1. The bottom surface of the toilet seat 22 has rubber protuberances 26. In the embodiment as shown, the hinge shaft 25 may be moved up and down with a slight stroke. Further, a seat switch 27 including a pressure-sensitive switching mechanism may be disposed between the upper surface of the toilet bowl 2 and the hinge shaft 25. The seat switch 27 is connected via a lead wire 28 to a controller 29 installed in the wall 41 of the adapter or the toilet room. The controller 29 is connected through a signal wire 30 to the warm air generator 12. The outlet 32 of the generator 12 is cannected to the warm air duct 4. In the water closet 1 having the above structure, when a user sits down on the toilet seat 22, the seat switch 27 is turned on, the warm air generator 12 is actuated, and then, the warm air is blown out from the outlet 5. The warm air contacts and warms the lower half, particularly the calves, of the user. Because the warm air is blown out shortly after the actuation of the warm air generator 12, the water closet has a good starting performance, and thus provides a comfortable heating. The on-off control of the warm air generator may be carried out, using means other than the seat switch. The water closet unit of this embodiment will be explained in detail, referring to Figs. 45 to 48. As shown in Fig. 45, there are four pillars 41, 42, 43, 44 at four corners in the toilet room 20. Sleepers 45 and foundations 46 are arranged between the pillars, and the foundations 46 are arranged on pedestals 47 (Figs. 45 and 46). Metallic fixtures 48a having an L-shaped sectional profile are fastened with screws to the side walls of the sleepers 45 and foundations 46. A waterproof pan 48 is held on the metallic fixture 48a and composes the floor of the toilet room 20. Between the pillars 41 and 42, there is installed the adapter 49 comprising a box-like structural frame. The frame type adapter 49 comprises twelve main angle bars 50 corresponding to twelve edges of a rectangular parallelepiped, and sub-angle bars 51 spanning the main angle bars 50. Plural bolt holes 52 are vertically provided in the sub-angle bars 51a facing the toilet room. The bench type water closet 1 is attached to the adapter 49 with bolts 53 through the bolt holes 52. The water closet 1 is fastened to the adapter 49 via a fixing plate 54 made of an iron plate. The fixing plate 54 has openings 55 for bolts 53, an opening 57 for a drainage pipe 56, and an opening 58 for the warm air outlet 32. As shown in Fig. 47, the drainage pipe 56 has a widened portion 56a at the end thereof. The widened portion 56a is connected via a gasket 59 to the drainage hole 7 of the water closet 1. Further, the widened portion 56a is held on the edge of the opening 57 of the fixing plate 54 via a packing 60. The drainage pipe 56 is an elbow pipe, and is connected with a wastepipe 61 at the other end. The bolts 53 are inserted through the bolt holes 64 of the water closet 1 via space nuts 62 and rubber packings 63, and then threadedly engaged with decorative nuts 67 through sectional nylon packings 65 and washers 66. In the sides of the water closet 1, openings 68 are provided through which the decorative nuts 67 may be clamped with a tool. A cover 69 is removably fitted over the opening 68 (Fig. 41). In the vertical main angle bars 50 nearer to the toilet room, screw holes are provided. The adapter 49 is fastened by locking the screws 71 to the pillars 41 and 42 through the holes 70. Fig. 46 shows a bay window unit 72 which is attached to the outside of the pillars 41 and 42 and covers the adapter 49, and further a tank 73 for washing water installed in the adapter. A lidded waste trap 48b provided to the waterproof pan 48 is also shown. An appropriate decorative panel (not shown) or the like is disposed in the front face of the adapter 49. As shown in Fig. 48, two outlets 32 are symmetrically disposed on the warm air generator 12. The warm air duct 4 is connected with the outlet 32 to communicate the warm air generator 12 and the water closet 1. The warm air generator 12 has L-shaped brackets 75 for attaching to the fixing plate 54 with screws (Figs. 46 and 47). In the bench type water closet unit having the above structure, the water closet 1 is fastened to the adapter 49, and in turn the adapter 49 is attached to the pillars 41 and 42. Thus, the supporting strength of the water closet is extremely high. Because the bench type water closet is used, the floor (the waterproof pan 48) of the toilet room can be wholly washed. The washing water may be removed through the trap 48b. In the above embodiment, for each bolt hole 64 of the water closet 1, there are plural bolt holes 52 in the sub-angle bars at various heights. The height of the water closet 1 may be easily adjusted by changing the bolt hole in the sub-angle bars 51 through which the bolts 53 are inserted. The adapter 49 may be installed so as to protrude from the toilet room, or the bay window unit 72 may be installed, whereby the space of the toilet room may be enlarged. Fig. 49 illustrates another embodiment wherein the water closet 1 according to the present invention is installed in a different manner. In this embodiment, a major part of the adapter 49 is installed in the inside of the pillars 41 and 42. The main angle bar 50 in the lower front part of the adapter 49 is fixed on the sleeper 45. The reference numerals in Fig. 49 have the same meanings as those given in Fig. 41. It should be understood that the detailed description as to the water closet unit with reference to the above drawings is given by way of illustration only. For example, the number of warm air outlets, the position of the warm air path, the structure of the warm air path (the presence or the absence of the guiding groove), the direction of the warm air blown out, or the like, may be different from those shown in the drawings. The water closet used may be of bench type, or be fixed on the floor. A device for controlling an amount of the warm air may be installed. The adapter used need not be the frame type, but e.g. a box which is made of plates and has appropriate openings. The shape of the adapter may be approxiately adjusted in accordance with the shape of the toilet room. The water closet of the present invention may be adapted for attachement to the wall or the like of the toilet room, instead of the pillars. As explained, the sitting type water closet, particularly the bench type water closet, can be installed in the toilet room with an extremely high strength, using the water closet unit of the present invention. An air conditioner or the tank for the washing water may be installed within the adapter. By protruding the adapter from the building as the bay window, the inner space may be enlarged. Figs. 1 to 24 illustrate various embodiments of the water closets which may be employed in the water closet unit according to the present invention. Figs. 1 to 4 show a first embodiment of the water closet which may be used in the water closet unit of the present invention. The western-style bench type water closet 1 is attached to the side wall of the toilet room or the like at the rear side 1a of the closet. A toilet bowl 2 is provided as the front portion of the closet 1, and a rim water conduit 3 is provided at the upper portion of the bowl 2, surrounding the bowl 2. In the water closet 1, the warm air duct 4A is disposed integrally with the bowl 2, extending longitudinally, i.e., from the rear portion of the bowl to the front portion of the bowl. The warm air duct 4A ends at the front portion of the bowl 2 to form a warm air outlet 5. The other end of the warm air duct 4A is open at the rear side 1a of the water closet 1. The water closet 1 further contains a trap 6 and a drainage hole7. With a water closet having the above structure, one can blow warm air out from the outlet 5, by disposing a warm air generator (refer to Fig. 25, etc.) connected with the warm air duct 4A. Figs. 5 and 6 show another embodiment of the water closet which may be used in the water closet unit of the present invention. In the water closet 1 of this embodiment, the outlet 5 is disposed at a position higher than that of the above embodiment shown in Figs. 1 to 4. The warm air duct 4A is also disposed at the front portion of the bowl 2, diagonally upwardly extending from the rear portion to the front portion. Therefore, the warm air is blown out diagonally upwardly, and thus, the upper parts of a user's legs are heated. Figs. 7 to 10 show another embodiment of the water closet which may be employed in the water closet unit of the present invention. In the water closet 1 of this embodiment, the warm air duct 4A is disposed along the upper periphery of the bowl 2. As shown in Figs. 8 and 10, the warm air duct 4A surrounds the outer periphery of the rim water conduit 3, at the front portion of the toilet bowl 2. Each outlet 5 is an opening in the bottom wall of the warm air duct 4A at the front portion of the bowl 2. In the embodiment as shown, three outlets are disposed, although any number of the outlets 5 may be formed. Figs. 11 to 13 illustrate other embodiment of the water closet which may be used in the water closet unit of the present invention. In this embodiment, the warm air duct 4B is formed separately from the bowl 2. It is disposed along the bottom surface of the bowl 2, extending longitudinally, i.e., from the rear portion of the bowl to the front portion of the bowl. Ths outlet 5 is formed at the end of the duct 4B. In this embodiment, there is a cover 15 for the bowl 2. The duct 4B is disposed in a space between the cover 15 and trap 6. Figs. 14 and 15 show another embodiment of the water closet which may be used in the water closet unit of the present invention. This embodiment is different from the preceding embodiment with respect to the fact that no cover for the bowl 2 is provided, and thus the warm air duct 4B is exposed. In the above embodiments as shown in Figs. 11 to 15, the warm air duct 4B can be attached to the water closet without changing the conventional shape of the closet per se. Thus, the water closet can be easily manufactured. Figs. 16 and 17 show another embodiment of the water closet which may be employed in the water closet unit of the present invention. The water closet 1 of this embodiment corresponds to the water closet having a cover 16 for the warm air duct as shown in Figs. 14 and 15. The cover 16 can be attached with, for example, an adhesive. The water closet of the embodiment as shown in Figs. 16 and 17 can also be easily manufactured without changing the conventional shape of the water closet. Further, the cover 16 brings about a good appearance. Figs. 18 and 19 illustrate another embodiment of the water closet which may be used in the water closet unit of the present invention. In the water closet 1 of this embodiment, a wall 17 is arranged to form the warm air duct 4A with the bowl cover 15, trap 6, the bottom surface of the bowl 2 and the wall 17. Figs. 20 and 21 show another embodiment of the water closet which may be used in the water closet unit of the present invention. In this embodiment, the warm air duct 4B is attached to the water closet 1 with a rubber sucker 18. Thus, the duct 4B can be easily attached to and removed from the closet 1. Figs. 22 to 24 show another embodiment of the water closet which may be used in the water closet unit of the present invention. In this embodiment, the warm air ducts 4A is formed integrally with the water closet 1 and disposed, longitudinally, extending to the lower portion of the bowl. From the outlet 5 to the tip of the bowl, a warm air guiding groove 8 which does not have a bottom wall is disposed, extending to the tip of the bowl so as to guide the warm air toward the upper portions of the legs of the user. In the sitting type water closet of the above embodiment, the outlet at the end of the warm air duct is rearwardly spaced at a given distance from the tip of the bowl. Therefore, if the foul water runs down to the outlet, the foul water is prevented form entering into the warm air duct. Thus, it may be avoided that the foul water becomes a source of bad odours. Even if the dried foul water is bonded to the ceiling or the side wall in the warm air duct, it may be easily removed by wiping. As described, the warm air duct may be formed integrally with the toilet bowl. Alternatively, the duct may be formed separately from the bowl, and then attached thereto. According to some embodiments of the present invention, a means for facilitating the attachment of the water closet to the adapter is provided. Thus, a fixing plate may be attached on the adapter side facing the toilet room, and nuts may be fixed on the plate, whereby the water closet can be fastened to the adapter with the bolts threadedly fittable to the nuts. Alternatively, bolts may be fixed on the plate instead of the nuts, and the bolts are inserted through the bolts holes in the water closet, whereby the water closet can be fastened to the adapter with the nuts threadedly fittable to the bolts. Because the fixing plate having such structures is attached to the adapter, the water closet can be attached to the adapter by bringing the rear side of the water closet with the fixing plate and then fastening the bolts or nuts. Accordingly, a register of the water closet and the fixing plate can be easily carried out, and the bolts and nuts can be easily fastened. Figs. 50 to 52 schematically show the condition wherein the water closet 1 is attached to the adapter 49, using the fixing plate having such specific structure, particularly the fixing plate 54 shown in Fig. 53 As shown, particularly in Fig. 52, the fixing plate 54 has through holes 163 for the bolts 162 to attach the water closet 1. At the rear side of the water closet 1, through holes 164 are provided for the bolts 162. Nuts 165 threadedly fittable to the bolts 162 are fixed, e.g. by welding, at the positions of the through holes 163 on the rear surface of the fixing plate 54 (Fig. 53). The fixing plate 54 has a through hole 166 for a bolt 31a to attach the warm air generator 12. The fixing plate 54 is covered with a decorative panel 167. The panel 167 includes a through hole 167a for the drainage pipe 56, a through hole 167b for the warm air outlet 32, through holes 167c for the bolts 31a, and through holes 167d for the bolts 162. The warm air generator 12 has an L-shaped bracket 75 so as to attach the generator to the fixing plate 54 with screws (Fig. 52). The warm air generator 12 and the decorative panel 167 are attached by inserting the bolts 31a through the holes 167c and 166 in the decorative panel 167 and the fixing plate 54, and fastening the nuts. To carry out the attachment of the water closet 1, the fixing plate 54 is fixed to the adapter 49 with the bolts 53. The warm air generator 12 and the decorative panel 167 are then fixed with the bolts 31a. The rear end 1a of the water closet 1 is brought into contact with the decorative panel 167, and the bolts 162 are threadedly engaged with the nuts 165. In this case, the bolts 162 can be easily engaged with the nuts 165, which have been fastened on the back surface of the fixing plate 54. Fig. 54 shows another fixing plate 54′ which may be used in the present invention. The fixing plate 54′ does not have bolt holes 163 and nuts 165. Instead thereof, stud bolts 74 are provided on the fixing plate 54′. The water closet 1 can be attached by inserting the stud bolts 74 through the bolt holes 167d in the decorative panel 167 and the bolt holes 164 in the water closet 1, and then fastening the nuts. The reference numerals in Fig. 54 have the same meaning as given in Fig. 53. The water closet 1 can be easily attached to the adapter, using also the fixing plate 54′. In still another embodiment of the present invention, the warm air outlet may be arranged on the side wall of the adapter, instead of or in addition to the warm air outlet in the water closet. The warm air outlet is provided on the same side wall as that used for attaching the water closet. Further, the warm air outlet is provided at a height lower than that of the top of the water closet. When the water closet unit having such a structure is installed in the toilet room, the warm air is blown out from the lower portion of the wall behind the water closet and can rapidly warm the legs of the user. Further, the toilet room is wholly heated, too. When the warm air outlets are arranged in both the side wall of the adapter and the lower portion of the water closet, the warm air is also blown out from the water closet, and thus, the legs of the user may be effectively warmed. Further, the dew condensation of the toilet bowl and the freezing of the trap water can be avoided. Figs. 55 to 59 illustrate the condition wherein the adapter 49 carrying the water closet 1 fastened thereto is attached to the pillar 41 in the toilet room 20. The adapter 49 contains the warm air generator 12 therein. The reference numerals in Figs. 55 to 59 have the meanings as given above. The toilet room 20 has a door 269 (Fig. 56). The adapter 49 carries appropriate decorative panels 49A, 49B and 49C on the front and upper sides thereof (Fig. 57). As shown in Figs. 58 to 60, the warm air generator 12 is included in a casing 284 which is transversely arranged behind the water closet 1. The casing 284 further contains a turbo-fan, a resistance heating element (such as a ceramic heater element) and the like. The warm air generator 12 has warm air pipes 282 and warm air outlets 286 on both sides at a height lower than that of the upper face 1U of the water closet. The warm air generator 12 has an intake vent 288. As shown in Fig. 57, openings 290 are arranged on the front panel 49B of the adapter 49 so that the outlets 286 face the toilet room 20. In the toilet room having such a water closet unit, the warm air is blown out from the outlets 286 arranged on the wall of the adapter and the outlets 5 in the water closet 1, to effect warming and, particularly the warming of the legs of the user. When the warm air generator having the resistance heating element as a heat source is employed, the warm air with a high temperature is blown out shortly after the warm air generator is turned on, and thus, the water closet has a good starting performance. The warm air outlet on the wall of the adapter may be arranged at a height lower than that of the water closet, whereby the legs of the user may be warmed more sufficiently. When the outlets 286 on the wall of the adapter are arranged in both sides of the water closet as in the embodiment illustrated in Figs. 57 to 60, the toilet room 20 may be more effectively warmed as a whole. There may be arranged a device for controlling that the warm air is blow out from either the outlet 286 on the wall or the outlet 5 in the water closet. In this case, the water closet unit may be constructed so that the heating of the whole room is effected by blowing the warm air out only from the outlet 286, and further, the warm air is blown out from the outlet 5 when the water closet is employed. The water closet and the water closet unit according to the present invention may be controlled in various manners by employing the seat switch. For example, an on-off control of the warm air generator may be carried out by an on-off signal by the seat switch. In this case, when a user sits down on the toilet seat, the warm air starts to blow, and when the user stands up from the seat, the blowing ceases. Therefore, electric power consumption may be reduced, and this embodiment is economical. Further, a timer may be added to the warm air generator, and at the same time, the power of the warm air generator may be made controllable. In this embodiment, when the timer is on, the warm air generator is operated under a low power to blow the warm air having a relatively low temperature. When the user sits down on the toilet seat, the warm air generator is operated under a high power to blow the warm air having a relatively high temperature during the employment of the water closet by the user. In the water closet or water closet unit wherein the timer controlling system is employed, the temperature in the whole toilet room may be elevated by blowing the warm air out when the water closet is not used. To improve the starting performance of the whole heating of the toilet room, there may be used the system wherein the warm air generator is operated under a high power when the timer is on, and the low power is utilized if the user feels the air hot. For example, as shown in Figs. 41 and 42, the seat switch 27 including the pressure-sensitive switch mechanism is disposed between the hinge shaft 25 and the upper surface of the toilet bowl 2. The seat switch 27 is connected via the lead wire 28 with the controller 29, and then via the signal wire 30 with the warm air generator 12. The outlet 32 of the warm air generator 12 is communicated with the warm air duct 4. Figs. 61 to 63 illustrate the structure of the seat switch 27. The seat switch 27 is covered with cylindrical jackets 27a, 27b made of an elastic material, such as a rubber. At the end of the elastic jacket 27a, a pair of semicircular electrodes 27c, 27d is disposed by introducing them into receptacles 27C, 27D in the elastic jacket 27a. The end of each receptacle 27C and 27D is connected with lead wires 28 (28a and 28b). An insulating material 27e is introduced between the electrodes 27c and 27d. An insulating spacer 27f in the form of a thin plate having an opening, e.g., a ring, is disposed, contacting the electrodes 27c and 27d. On the insulating spacer 27f, an electrically conductive, elastic (e.g., rubber) piece 28g and a press piece 27h are stacked. In the seat switch 27, when a compression load is applied to the elastic jacket 27a in an axial direction thereof, the cap-shaped elastic jacket 27b is deformed in an axial direction. In the switch, then, the conductive elastic piece 27g is pressed with the press piece 27h. The conductive elastic piece 27g is deformed so that a part thereof is introduced into the opening of the insulating spacer 27f. Thus, the tip of the introduced part of the conductive elastic piece 27g contacts the electrodes 27c, 27d, whereby the electrodes 27c and 27d are connected with each other, and the seat switch is turned on. When the compression load is removed from the seat switch 27, the elastic jacket 27b recovers the original shape thereof. Thus, the conductive elastic piece 27g recovers the original shape, and then separates from the electrodes 27c and 27d. Therefore, the electrodes 27c and 27d separate from each other, and the seat switch 27 is turned off. In the water closet having the above structure, when the user sits down on the toilet seat 22, the seat switch 27 is turned on, the warm air generator 12 is then operated, and the warm air is blown out from the outlet 5. The warm air contacts the lower half of the body, particularly the calves, of the user, thereby heating the legs of the user. Referring to Figs. 64 to 67, the structure of the controller 29 and the warm air generator 12 will be explained hereinafter. As shown in Fig. 64, the warm air generator 12 has an electric heater (ceramic heater) 381 as a heat source. The generator further contains a propeller fan 382 as a fan. An air filter 383a is disposed on an intake vent 383. The warm air generator 12 is installed within the bay window unit 72. The controller 29 comprises a main switch 384 for turning the whole circuit on or off, a temperature presetting device 385 for setting a standard temperature at which the electric heat 381 is operated, the timer 386, a switch 387 for forcing the warm air generator 12 to work, and the like. The lead wire 28 from the seat switch 27 and the signal wire 30 to the warm air generator 12 are connected with the controller 29. Further, a temperature sensor 388 to detect the temperature in the toilet room 20 is connected with the controller 29. The controller 29 contains a device for the control as described below, such as a sequence control circuit of microcomputer. As shown in Fig. 65, when the user sits down on the toilet seat 22 and the seat switch 27 is turned on, the temperature in the toilet room 20 is judged if it is lower than the predetermined standard temperature (e.g., 20°C). If the temperature is lower than the predetermined one, the electric heater 381 is turned on, the propeller fan 382 is rotated, and then the warm air is blown out from the outlet 5. If the temperature is higher than the predetermined one, the warm air is not blown out. When the user stands up from the toilet seat 22, the electric heater 381 is turned off and the rotation of the propeller fan 382 is stopped. When the timer 386 is turned on (i.e., when the preset time comes to blow the warm air out), or when the forcing switch 387 is turned on, the temperature in the toilet room 20 is judged if it is lower than the predetermined one. If the temperature is lower, the electric heater 381 is turned on, and the propeller fan 382 is rotated, and thus, the warm air is blown out. Fig. 67 shows an embodiment wherein the timer 386 is employed. In this embodiment, the timer 386 is preset so that it is turned on only during 5: 00 a.m. to 8: 30 a.m., when the water closet is frequently employed. Thus, the toilet room 20 is intended to be warmed as a whole (arrow B). During 5: 00 a.m. to 8: 30 a.m., i.e., when the timer is on, if a user sits down on the seat 22, the electric heater 381 is operated in a full power to blow the warm air out (arrows C, D, E, F, G). During the other period of time, only if the user sits down on the toilet seat, the electric heater 381 is worked to blow the warm air as shown in arrows A and H in Fig. 67. By continuously operating the electric heater only during the period of time when the water closet is frequently employed, as above, it is possible to save electricity, and at the same time, perform the whole heating of the toilet room. Therefore, both economical and comfortable requirements may be met. Because the electric heater 381 is turned on, the warm air is blown out immediately after the user sits down. It is preferable in the above embodiment to use an electric heater which can save electricity (for example, the resistance heating element which can change the powers, for example, of 400 W and 800 W) and to blow the warm air having relatively low temperature by working the electric heater under a lower power when the timer is on (arrow B in Fig. 67). Further, the power of the heater may be changed between more than two levels, or continuously controlled. According to still another embodiment of the present invention, the seat switch brings about another control system. The present invention also provides a water closet or a water closet unit comprising the warm air path [(i) the warm air duct and optionally (ii) the warm air guiding groove] for blowing the warm air out to the legs of the user from the lower portion of the water closet installed to the toilet room, the warm air generator [(i) the blower arranged in the warm air duct, for generating the air stream flowing to the legs of the user, and (ii) the electric heater arranged in the warm air duct, for heating the air stream flowing through the duct, when turned on], and a controlling device which applies an electric current to the electric heater when the user of the water closet sits down on the toilet seat, but restrains an amount of the air from the blower until a given period of time elapses. In the above embodiment, the electric heater is turned on when the user sits down on the water closet installed in the toilet room. Further, the amount of the air from the blower is restrained, until the given period of time elapses after the user sits down on the water closet. Therefore, the heat radiation from the electric heater is prevented, and thus, the heater can rapidly go up to the predetermined temperature. After the given period of time elapses, the blower starts to work for conveying a given amount of the warm air. Then, the warm air heated up to the predetermined temperature is blown out from the outlet of the warm air duct disposed in the lower portion of the sitting type water close to the legs of the user. Therefore, this embodiment can prevent cold air from blowing out, shortly after the electric heater starts to work. Figs. 68 to 70 illustrate the toilet room including the water closet unit of the above embodiment. Figs. 71 and 72 show a leg heater contained in the warm air generator. The water closet unit 401 comprises a heat pump type air-conditioner 403 for wholly heating the toilet room 20; a ventilating duct 404 for blowing the warm air out into the toilet room 20; the blower 452 arranged in the warm air duct 404 for generating the air stream to the leg of the user; and the leg heater 405 for heating the air passing through the ventilating duct 404. The water closet unit 401 is connected with the control panel 406. The toilet room 20 comprises a side wall 422 carrying the door 269; a side wall 424 carrying a container cabinet 423 for toilet paper; a side wall 425 carrying the control panel 406; the bay window unit 72 protruding outwardly; a resin floor 48; and a ceiling 429 carrying an air fan. The bay window unit 72 comprises a side wall 426a, and a counter 426c which is arranged in the front wall 426b and contains the air-conditioner 403 and the leg heater 405 therein. The air-conditioner 403 is a window fan type, and fastened on the rear face of the side wall 426d of the counter 426c. The air-conditioner 403 is contained in the adapter 49 comprising the counter 426c and the side wall 426b. The air-conditioner 403 may contain a refrigeration cycle (not shown) within a unit case 431. Grilles 432 are provided to the outlet arranged on the front wall of the unit case 431, and an intake vent (not shown) and an outlet (not shown) arranged on the side wall of the unit case 431. The ventilating duct 404 comprises an intake duct 441 for drawing in the air present in the toilet room 20; a heater duct 442 connecting with the intake duct 441; and two warm air ducts 4 formed integrally on the lower portion of the toilet bowl 2 and connected with the heater duct 442. The intake duct 441 has an intake vent 444 which faces the toilet room 20 to take in the air present therein, and is arranged at the back of the grille 432 of the air-conditioner 403. The heater duct 442 is disposed at the leg heater 405. The warm air duct 4 has the warm air outlet 5 which has an opening near to the legs of the user, and blows the warm air out to the legs exposed when the user employs the water closet. From the warm air outlet 5 to the tip of the water closet 1, there is provided a warm air guiding groove 8 so as to minimize the reduction of the temperature of the warm air. The leg heater 405 comprises a casing 451 for heat insulating the heater duct 442 from the air; an axial flow fan or the blower 452, which is arranged in the heater duct 442 and generates, in the heater duct 442, the air stream to the toilet room 20; two harmonica type positive thermistor cells (hereinafter referred to as PTC heater) 453 which are arranged in the heater duct 442, and heat the air passing therethrough. The casing 451 has a parallelepipedic shape, and is fastened to the rear side of the side wall 426b of the counter 426c, with the fixing stays 451a welded to the casing 451. The casing 451 carries, on a side plate 451b, a connector 454 for applying the electric current to the axial flow fan 452 and the PTC heater 453. Further, on the casing 451, a tail end 442a of the side plate 451b, and a two-way tail end 442b of the heater duct 442 is outwardly protruded from the other side plate 451c. The axial flow fan 452 can serve to blow out a given amount of the air from the warm air outlet 5 to the exposed legs of the user, when it receives a given amount of electric current from the control circuit 466. When the axial flow fan 452 receives electric current from the control circuit 466 in an amount less than the predetermined one, the fan serves to blow the air to the exposed legs of the user in an amount less than the predetermined one. The PTC heater 453 is formed by arranging many positive thermistor cell plates 455 (comprising conductive ceramics mainly composed of barium titanate (BaTiO3), or the like] between a positive electrode plate 456 and a negative electrode plate 457. The PTC heater is formed so that the resistance thereof is suddenly increased at a given Curie point, by introducing various additives. The PTC heater 453 makes use of the PTC characteristic property to maintain the surface temperature at a constant level by a current restriction function in the area where the resistance is suddenly changed. The Curie point of the PTC heater 453 is set to a temperature (e.g., 300°C) lower than an ignition point (e.g., 400°C) of dust or the like so that the surface temperature (almost the same temperature as Curie point) of the PTC heater 453 is set to the temperature lower than the ignition temperature of the dust. Fig. 73 shows a block diagram of the built-in control circuit of the control panel. The control panel 406 carries, on the entire front surface thereof, a switch 461 of the leg heater, a switch 462 of the air-conditioner, and a switch 463 for selecting air-cooling or air-heating. The control panel 406 contains a control circuit 466 as a controlling device to receive signals from the leg heater switch 461, the air-conditioner switch 462, the cooling/heating-changing switch 463, the seat switch 27 and timer 465. The leg heater switch 461 is a manual switch which gives to the control circuit 466 on-off signals of the leg heater 405, i.e., the axial flow fan 452 and the PTC heater 453. The leg heater switch 461 has three positions, i.e., "off", "weak", and "strong". The "weak" means one of the PTC heaters 453 is on, and the "strong" means two PTC heaters 453 are on. The air-conditioner switch 462 is a manual switch which gives to the control circuit 466 on-off signals of the air-conditioner 403. The cooling-heating changing switch 463 is a manual switch for changing the air-cooling to the air-heating, and vice versa. The seat switch 27 is disposed under the toilet seat 22 of the water closet 1. When the seat switch 27 detects that the user sits down on the water closet 1, the seat switch 27 sends a sitting signal to the timer 465 and the control circuit 466 so that the axial flow fan 452 and the PTC heater are turned on. The seat switch 27 contains a pressure-sensitive switch which changes the resistance thereof by the weight of the user who sits down on the water closet 1, and sends the on-signal to the timer 465 and the control circuit 466 so that the leg heater 405 is turned on. The timer 465, when receiving the on-signal from the seat switch 27, gives an off-signal to the control circuit 466 so as to defer operating the axial flow fan 452 for a given period of time (for example, for 5 seconds). The control circuit 466 performs, in accordance with the input signals received, the on-off control of the air-conditioner 403, the axial flow fan 452 and the PTC heater 453, via an electrical box 467. Further, the control circuit 466 turns the axial flow fan 452 off to restrain the amount of the air from the fan 452, during a period of time when the circuit 466 receives the off-signal of the fan 452 from the timer 465. The electrical box 467 is arranged in the upper portion of the unit case 431 of the air-conditioner 403, connected with a domestic electric source (100 V), and supplies an electric current to the air conditioner 403, the axial flow fan 452 and the PTC heater 453. The operation of the leg heater 405 in the control circuit 466 according to the above embodiment will be explained, referring to Fig. 74. First, a judgement is made if the leg heater switch 461 is on (or strong or weak) or off (step S1). When the leg heater switch 461 is off (No), the PTC heater 453 is turned off (step S2) and the axial flow fan 452 is turned off (step S3). Thereafter, the step S1 is repeated. When the leg heater switch 461 is on (Yes) in the step S1, a judgement is made if the seat switch 27 is on (step S4). When the seat switch 27 is off (No), the step S2 is selected. If a user of the water closet 1 sits down on the toilet seat 22 in this situation, the resistance of the seat switch 27 is changed by the weight of the user. Then, the seat switch 27 sends the on-signal for turning the leg heater 405 on to the timer 465 and the control circuit 466. As above, when the seat switch 27 is turned on (Yes), the PTC heater is turned on (step S5), and the axial flow fan 452 is turned off (step S6). The PTC heater 453 has a large heat capacity, and thus, cannot be rapidly elevated to the predetermined temperature. If the PTC heater 453 in this condition is brought into contact with a fresh air (not heated) by the axial flow fan 452, the time necessary to elevate the temperature of the heater 453 per se to the predetermined one becomes longer. As a result, the air having a relatively low temperature is blown out from the warm air outlet 5 to the leg of the user. If the air not heated is blown out to the legs of the user shortly after the PTC heater 453 begins to work, the undressed user would feel the touch cooler than that the user feels when dressed. The user sitting on the seat 22 cannot but receive the cool air at the legs. Therefore, it is necessary to introduce a means for avoiding the cool feel for the user, in the water closet 1 carrying the leg heater 405 and the warm air outlet 5 therefor on the lower portion of the closet. In the above embodiment, accordingly, the axial flow fan 452 is maintained to be off, until a given period on time (e.g., 5 seconds) elapses after the seat switch is turned on (step S7), to restrain the amount of the air blown. The PTC heater 453 stands under the windless condition, and the heat radiation therefrom is prevented, whereby the heater is rapidly elevated to the predetermined temperature. Accordingly, it is avoided that the cool air is blown out to the legs of the user shortly after the PTC heater 453 is operated. Thus, the cool touch can be remedied. After the predetermined period of time, the axial flow fan 452 is turned on to produce the air stream in the ventilating duct 404 (step S8). When the axial flow fan 452 is on, the air present in the toilet room 20 is sucked into the intake duct 441 from the intake vent. The air sucked into the intake duct 441 is introduced into the heater duct 442, heated to the predetermined temperature with the PTC heater 453, and then conveyed to the warm air duct 4. The warm air introduced into the warm air duct 4 is blown out from the outlet 5, blows along the guiding groove 8, on the closet, and reaches the legs of the user, thereby sufficiently heating the user. In comparison with the case wherein the axial flow fan is turned on immediately after the PTC heater 453 is turned on, the user can feel the improved touch as shown in Table 1 by deferring the operation of the axial flow fan 452 until the predetermined period of time elapses. As shown in Table 1, when the axial flow fan 452 and the PTC heater 453 are simultaneously turned on, the user feels the cooling air stream for about 15 seconds after the fan and heater begin to work. The user does not feel the cooling or warm touch about 15 to 20 seconds later, and then becomes to feel the warm touch about 20 seconds later. On the other hand, when deferring the operation of the fan, the user does not feel the cool touch even for about 15 seconds immediately after the PTC heater 435 is turned on, whereas the warm touch can be obtained about 20 seconds later. This means that the heating effect is not affected. As above, the cool touch shortly after the PTC heater 453 is turned on can be avoided, and the rapid heating effect can be satisfactorily obtained. Fig. 75 shows the flow chart of another operation of the leg heater 405 in the control circuit 466. The explanation of the operations described with reference to Fig. 74 will be omitted. In this embodiment, not only the PTC heater 453, but also the axial flow fan 452 are turned on at the same time until the predetermined period of time elapses, but the fan is operated to flow a small amount of the air out, namely, the air in an amount smaller than the predetermined normal amount (step S9). The word "small amount of the air" or the like used herein means the amount which does not give the user the cool touch. Although the above embodiments are described with respect to the counter type adapter, the frame type adapter may also be used. Instead of the PTC heater, an electric heater such as a nichrome wire heater may also be employed. According to the present invention, there is provided a means for remedying the defects caused by the PTC heater used as the heating means in the warm air generation. When the PTC heater is used under a reducing atmosphere such as hydrogen sulfide which is one of the malodorous components in the toilet room, the PTC characteristics can be changed by reduction. Fig. 76 is a graph showing the relationship between the surface temperature of the PTC heater and a ratio of resistance at a given temperature to that at 25°C (R₂₅). When the PTC characteristics are changed, the PTC resistance curve is changed from the curve I to the curve II. As a result, the operation point which is the intersection point of a wind velocity v (m/s) and the PTC resistance curve is moved from the point A to the point B. The surface temperature of the PTC heater is elevated by T°C. Therefore, the conventional heating apparatus for the toilet room which apparatus employs the PTC heater has a problem that the PTC heater encounters the reduction deterioration when used for a long time, and then the PTC properties are changed. As a result, the surface temperature of the PTC heater, and thus, the temperature of the toilet room is elevated, whereby the heating feeling is lowered. Accordingly, an embodiment of the present invention provides a combination of an outside air introducing type ventilating duct which inhales the air present outside the toilet room and blows out into the toilet room, a blower which is arranged in the ventilating duct and produces the air stream into the toilet room, and the PTC heater which is arranged in the ventilating duct and heats the air. The above structure brings about the following advantages. The air present outside the toilet room is blown out into the toilet room by the blower, and thus the PTC heater is not exposed to the reducing gas such as hydrogen sulfide present in the toilet room, whereby the elevation of the surface temperature of the positive thermistor caused by the reduction deterioration can be avoided. Further, the PTC heater can maintain the surface temperature thereof at a constant level. Therefore, when the temperature of the air outside the toilet room is lowered, the difference between the surface temperature of the PTC heater and that of the outside air is increased, and thus the heat release value is increased. Thus, the heated air blown out into the toilet room has a constant temperature, independently of the variation of the outside temperature. Further, the heating feeling is not lowered, even if the outside air has a low temperature. Fig. 77 shows an embodiment wherein the above water closet is installed. The water closet unit 501 is arranged within the counter 523 disposed on the side wall 522 which is protruded to the outside 521 of the toilet room 20. The water closet 1 is attached to the side wall 423a of the counter 523. The counter 523 and the side wall 423a form the adapter. The water closet 501 comprises the outside air introducing type ventilating duct 503 for blowing out the air (referred to as outside air) present outside 521 of the toilet room 20 (e.g., the outsides, or the adjoining room), and the warm air generator 12 arranged within the ventilating duct 503 comprises a bellows duct 531 for introducing the outside air, a chamber 532 connected with the duct 531, a bellows duct 533 connected with the chamber 532, the warm air duct 534 connected with the duct 533, and two warm air ducts 4 which are diverged from the warm air duct 534 and blow the warm air out to the legs of the user. An intake vent 531b having a hood 531a is arranged at the mouth of the duct 531. The chamber 532 forms a space having a sectional area larger than those of the ducts 531 and 533, so as to reduce the pressure and control the variation caused by the wind as to the amount of the inhaled air. In the chamber 532, a filter 532a is disposed to adsorb the dust included in the outside air. Heat insulating materials are disposed at the bifurcated ends of the ventilating duct 534. Between the bifurcated ends of the ventilating duct 534 and the warm air duct 4, there are provided sealing materials prevent leakage of the warm air. At the end of the warm air duct 4, there is an opening between the lower portion of the water closet 1 and the floor 48 to form the warm air duct 4. The warm air generator 12 comprises the casing 451 which covers the ventilating duct 534 with a gap therebetween to assure insulation with the air, the blower or the axial flow fan 452 which is arranged within the ventilating duct 534 and generates the air stream to the inside 425 of the toilet room 20, and two PTC heaters which are arranged within the ventilating duct 534 and heats the air stream passing therethrough. The warm air generator and the like contained in the water closet unit 501 are turned on, when the pressure-sensitive seat switch 27 disposed under the toilet seat 22 of the water closet 1 is turned on. When the user sits down on the water closet 1, the resistance of the seat switch is changed by the weight of the user, and thus, the switch sends on-signals to the axial flow fan 452 and the PTC heater 453. When the user stands up, the resistance is changed, and the switch sends off-signals to the axial flow fan 452 and the PTC heater 453. When the user stands up, the resistance is changed, and the switch sends off-signals to the axial flow fan 452 and the PTC heater 453. The axial flow fan 452 is rotated upon the receipt of the on-signal, and the outside air present in the outside 521 of the toilet room 20 is sucked through the outside air intake vent 531b to the ventilating duct 503. The sucked air is introduced into the chamber 532 via the duct 531. Relatively large dust particles contained in the outside air are caught by the filter 532a. After passing through the chamber 532, the outside air is conveyed to the ventilating duct 534 via the duct 322. The Curie point of the PTC heater 453 is preset to a point below the ignition temperature of the dust contained in the outside air. Upon receiving the on-signal, the PTC heater 453 consumes a large amount of electric current to generate heat, when the outside air has the low temperature and thus the resistance of the PTC heater is low. If the surface temperature is elevated to the temperature above the preset Curie point, the resistance is rapidly increased. Then, the amount of the current consumed is restrained, and a constant surface temperature may be maintained, whereby the surface temperature may be maintained under the ignition temperature of the duct. Because the air heated by the PTC heater 453 is the outside air which is introduced into ventilating duct 534 and is free from the reducing gases such as hydrogen sulfide, the reduction deterioration causing the elevation of the surface temperature of the PTC heater may be avoided, and thus, the ignition of foreign substances such as the dust adsorbed to the heater may be prevented. A reliable heating apparatus for the toilet room may be provided. Further, the PTC heater 453 has a constant surface temperature. When the temperature of the outside air is lowered, the surface temperature of the PTC heater 453 becomes largely different from the temperature of the outside air. Then, the PTC heater may reduce the resistance thereof, consume a large amount of current, and increase the heat (W) generated, whereby the reduction of the temperature of the outside air may be compensated by the increase of the heat generated. Therefore, the warm air outlet 5 of the warm air duct 4 can blow out the warm air heated by the PTC heater and having a constant temperature, regardless of the variation of the temperature of the outside air. Accordingly, the deterioration in the heating feeling can be prevented. The temperature drop of the warm air blown out from the warm air outlet (caused by the temperature drop of the outside air) can be more effectively prevented. The amount of the air blown out can be controlled in accordance with the outside air temperature determined through a sensor for detecting the temperature of the outside air. For example, when the temperature of the outside air is lowered, the amount of the air blown out may be reduced to thereby maintain a constant temperature of the warm air at the warm air outlet. The warm air outlet may be arranged on the side wall, ceiling, floor, or the like of the toilet room. Although the PTC heater may be formed by placing plural PTC heater plates by the side of another, the PTC heater may be produced from a single PTC heater. Further, an open close valve may be disposed in the warm air duct so as to open and close the duct, dependently upon the necessity of the heating. Alternatively, an air-conditioning apparatus, such as an air-cooling apparatus, an air-cooling and heating apparatus, or a ventilating apparatus may be installed in addition to the air-heating apparatus. The PTC heater exhibits a function to control the amount of the current at the area where the resistance is suddenly increased from the point corresponding to the Curie point. Thus, the PTC heater has the property that the temperature thereof is not elevated above a given temperature. In general, the PTC heater does not require a protection device for overheating. In the toilet room, however, the PTC heater employed in the heating apparatus can adsorb the dust from paper, clothes, or the like, which dust usually flies therein. The PTC heater employed in the heating apparatus for the toilet room is usually preset to a temperature at which the dust from paper, clothes or the like does not ignite, by virtue of the function of controlling the current. When the PTC heater is reduced with the reducing substances, however, the resistance increase caused by the temperature elevation becomes smaller. In other words, the current controlling function is lost if the PTC heater is reduced. The PTC heater can abnormally generate the heat. If the PTC heater is overheated, the PTC heater can reach the temperature at which the dust from paper, clothes or the like can ignite. Further, if the PTC heater is overheated, the user can feel an uncomfortable touch from the air overheated and blown out from the heating apparatus for the toilet room. According to an embodiment of the present invention, there is provided a combination of the ventilating duct for conveying the air into the toilet room; the blower for generating in the ventilating duct the air stream to the toilet room; the PTC heater which is arranged within the ventilating duct, generates the heat when turned on, and increases the resistance thereof as the temperature is elevated; and a safety means for turning the PTC heater off when the PTC heater is heated to the predetermined temperature. In the above embodiment, the PTC heater is turned off by the safety means, if the PTC heater arranged in the ventilating duct is reduced with the reducing substances such as hydrogen sulfide or ammonia contained in the air of the toilet room, thereby being rendered into the state where the resistance increase cannot be obtained with the temperature elevation; and then, the PTC heater is overheated to the predetermined temperature which is the temperature near to the ignition point of the dust, such as paper, fiber from clothes, or which is the temperature giving the uncomfortable feeling to the user. Fig. 79 shows an example wherein the above embodiment is installed in the water closet unit. The water closet unit 601 has the ventilating duct 604 for conveying the air from the lower portion of the toilet bowl 2 in the water closet 1 to the legs of the user. The duct 606 with the box disposed in the air-conditioner box 605 or adapter arranged at the rear side of the water closet 1 is connected with two ducts 4 integrally formed with the water closet 1 (Fig. 70) through the ventilating duct 604. The duct 606 within the box comprises an intake duct 609 for inhaling the air in the toilet room 20, a bellows duct 610, and a heater unit 611. The intake duct 609 has a grille 432 in the upstream portion of the opening. In the grille 432, a filter 613 is provided to prevent the paper or the fiber of the clothes from entering the heater unit 611. The bellows duct 610 is a duct for guiding the air sucked from the intake duct 609 to the heater unit 611. At the upstream portion of the heater unit 611, the blower 614 is arranged to generate in the ventilating duct 604 the air stream into the toilet room 20. This type of blower 614 comprises an axial flow fan 451 disposed within the cylindrical resin blowing duct 615. A heat insulating duct 618 made of a heat insulating material follows the downstream portion of the blower 614. The insulating duct 618 contains therein a first PTC heater 619 and a second PTC heater. A heat insulating material 614 is interposed therebetween. The first PTC heater and the second PTC heater generate the heat when turned on, and the resistance thereof is suddenly increased from the Curie point. In this embodiment, the Curie point is preset, for example, to 220-250°C which is lower than about 350°C, i.e., the ignition temperature of the paper, fiber of clothes, or the like. The first or second PTC heater 619 or 620 is an assembled article manufactured by laminating plural PTC heater plates with gaps therebetween in the form of a harmonica. The heater is arranged so that the air passes through the gaps between the PTC heater plates. Fig. 80 shows an electrical circuit 624 for the on-off control of the first PTC heater 619 and the second PTC heater 620. The first PTC heater 619 and the second PTC heater 620 are connected with each other in parallel, and can be connected with a commercial alternating source 624, if the main switch 623 is manually turned on by the user. The second PTC heater has a sub-switch 625 which is connected with the second PTC heater in series and can manually turn only the second PTC heater 620 on and off. In the case that the main switch 623 is on, both of the first and second PTC heaters 619 and 620 are turned on, if the sub-switch 625 is turned on. In the above case, only the first PTC heater 619 is turned on, if the sub-switch 625 is turned off. In the circuit of the first and second PTC heaters 619 and 620, temperature fuses 626 and 627 are interposed in series. Temperature fuses 626 and 627 are the safety means in this embodiment. If an atmosphere temperature is elevated up to the predetermined value, fuses are melted to break the circuit of the first and second PTC heaters 619 and 620. As shown in Fig. 79, temperature fuses 626 and 627 are arranged in the insulating duct 618 via heat-resistant insulating material, such as a mica plate 628, so that the warm air immediately after passing each of the first and second PTC heaters 619 and 620 touches directly the temperature fuse, respectively. The fuses 626 and 627 are formed to melt, if the first or second PTC heater is elevated up to the predetermined temperature, e.g., about 320°C, which is lower than the ignition point of the dust of paper or clothes, e.g., about 350°C. A current fuse 629 shown in Fig. 80 is a fuse for protecting the circuit by melting upon encountering overcurrent. The operation of the above embodiment will be explained hereinafter. The user turns the main switch 623 on, and then, the blower 614 is turned on through a circuit (not shown), for example, when he feels the toilet room is cold. The air present in the toilet room 20 is sucked through the intake duct 609, and blown out from the warm air duct 4 in the water closet 1 to the legs of the user. If not only the main switch 623, but also the subswitch 625 are on, the first and second PTC heaters are turned on to generate the heat. As shown in Fig. 81, the first and second PTC heaters have a resistance-temperature characteristic (curve A) such that heat is generated after turning on and the resistance is suddenly increased from the Curie point. In the ventilating duct 604, the air stream is produced by the blower 614. The temperature of the first or second PTC heater is determined by the crossing point C of the resistance-temperature characteristic curve A with the operation curve B defined by the amount of the air produced by the blower, the temperature of the air sucked, and the like. The air blown out by the blower 614 to the legs of the user passes through either the heated first or second PTC heater 619 or 620. As a result, the air which has passed through the ventilating duct 604 is blown out as a relatively warm air from the lower portion of the toilet bowl 2 in the water closet 1 to the legs of the user (high operation). When the main switch 623 is on, but the sub-switch 625 is off, only the first PTC heater 619 is worked, but the second PTC heater 620 is not turned on. As a result, the air passing through and heated by the first PTC heater 619 and the air passing through but not heated by the second PTC heater are agitated in the ventilating duct 604 at the downstream area of the first and second PTC heaters, and thus, the warm air having a relatively low temperature in comparison with that in the high operation is blown out to the legs of the user (low operation). The air present in the toilet room 20 can contain reducing substances, such as hydrogen sulfide or ammonia formed from a detergent for the water closet 1. If the PTC heaters 619 and 620 are exposed to the reducing substances, and then reduced therewith, the heaters do not exhibit the resistance elevation as the temperature elevation, as shown in Fig. 81 (curve D). In other words, the PTC heaters 619 and 620 lose the function to control the current as the temperature evevation, when reduced. The temperature of the reduced PTC heater 619 or 620 is elevated to the crossing point E of the operation curve B and the resistance-temperature characteristic curve D. If at least one of the first and second PTC heaters 619 and 620 is reduced and elevated up to the predetermined temperature of 320°C, the temperature fuse 626 or 627 arranged at the downstream area of the overheated heater is melted to turn the PTC heaters 619 and 620 off. As above, when at least one of the first and second PTC heaters 619 and 620 reaches 320°C, the safety means or the temperature fuse 626 or 627 is melted to cease the application of the current to the PTC heaters 619 and 620. Therefore, dusts adsorbed to the PTC heaters do not ignite. Further, the uncomfortable feeling caused by the unusual heat generation can be avoided. If only one safety means is provided downstream of plural PTC heaters, the overheat generation cannot be detected. If some PTC heaters are reduced and therefore generate excessive heat, and a part of PTC heaters including the reduced PTC heaters as above is turned on, the temperature of the air heated thereby can be lower than that obtained by using all of the normal (not reduced) PTC heaters. Therefore, it is necessary to arrange the safety means (temperature fuse 626) for detecting the abnormal heat generation of the first PTC heater, and the safety means (temperature fuse 627) for the second PTC heater. If the first PTC heater is elevated to the predetermined temperature, when only the first PTC heater is operated (low operation), the abnormal heat generation of the first PTC can be detected. Further, the safety means comprises the temperature fuses 626 and 627 connected with the first and seconf PTC heaters in series. Therefore, if one of the first and second PTC heaters generate the abnormal heat, both of the first and second PTC heaters are turned off. Fig. 82 illustrates the embodiment wherein the temperature fuses 626 and 627 are attached to the heat-resistant insulating material 614 supporting the first and second PTC heaters. It is possible to connect one temperature fuse (two in total) in parallel with each of the first and second PTC heaters and cease the current application only to the PTC heater causing the abnormal heat generation. Any number (one, or three or more) of PTC heaters may be disposed in the ventilating duct. The safety means may be used for the PTC heater of the whole room heating apparatus of the toilet room. The seat switch (which is turned on when the user sits down on the water closet) may be connected with the main switch in series. A deferring circuit for postponing the start to operate the blower for a given period of time may be arranged, thereby preventing the cool air from blowing on the user shortly after the seat switch is turned on. Further, after user stands up from the water closet, the blower may continue to operate for a given period of time, to thereby prevent the deformation of the ventilating duct with a remaining heat. A temperature sensor for detecting the temperature of the PTC heater may be used as the safety means instead of the temperature fuse. Using the temperature sensor, it is possible to control the current application to the PTC heater in accordance with the outlet from the sensor. Further, the current application can be controlled in accordance with the current amount or voltage of the PTC heater. According to the preferred embodiment of the present invention, there is provided a water closet unit comprising (a) a whole room heating device for heating all over the toilet room, (b) a sensor device for detecting an entrance into and an exit from the toilet room by the user thereof, and (c) a control device which ceases an operation of the whole room heating device, and, at the same time, actuates the warm air generator included in the water closet unit, to thereby perform a partial heating, when the sensor device detects the entrance of the user, and on the other hand, which actuates the whole room heating device, and, at the same time, ceases the warm air generator to thereby stop the partial heating, when the sensor device detects the exit of the user. The above water closet unit brings about the following advantages. When the toilet room is empty, all over the room is heated with the room heating device. When the user enters the toilet room, and the sensor detects the entrance thereby, the operation of the room heating device is stopped, whereas the electric heater air is blown out from the water closet or the portion around the closet to the legs of the user. When the user stands up from the water closet and the sensor detects the exit of the user from the toilet room, the electric heater and the blower are stopped operating, whereas the room heating device again starts to operate, thereby heating all over the toilet room. As above, using the sensor means, the control is made to change the operation of the air-conditioner from the whole heating to the partial heating (electric heater), and vice versa. Because the room heating device is changed to the electric heater in the heating means, when the user enters the toilet room, the cool touch caused by the blown air having the low temperature can be avoided. The high temperature air heated with the electric heater is applied to the exposed legs of the user, whereby the user can be rapidly and concentratedly heated at the portion where the user feels particularly cold. Further, because the operation of the wholly heating device is stopped when the user is in the toilet room, the cool feeling can be avoided, whereby the user can enjoy a comfortable atmosphere from the entrance into the room to the exit therefrom. The electric heater is operated for a short period of time when the user is in the room, and the cost can be saved. The water closet unit of the above embodiment will be explained with respect to Figs. 68 to 70, and 83 to 86. The water closet 401 comprises, in addition to the leg heater 405 as the partially heating device for blowing the warm air out to the leg of the user, the heat pump type air-conditioner 403 for wholly heating all over the toilet room 20, and the control panel 406 for controlling the air-conditioner 403 and the leg heater 405. A cubic frame type adapter 49 of stainless steel is installed within the bay window unit 72 to contain and fix the air-conditioner 403 and the leg heater 405. On the front surface of the cubic frame type adapter 49, the water closet 1 is attached thereto at the rear side of the closet with the bolts via a reinforced iron plate 726b. The bay window unit 72 contains therein toilet devices, such as the washing water tank 73, or the drainage pipe 56. The air-conditioner 403 serves as the wholly heating device in this embodiment, is a wind-fan type, and is contained in the cubic frame type adapter 49. The air-conditioner 403 is floatingly attached via a rubber mount 732 to a slide pan 731 fixed to the adapter 49 with bolts, whereby vibration of the water closet unit can be avoided by preventing transmission of vibration of the air-conditioner 403 to the bay window unit 72. A unit case 733 for the air-conditioner 430 is connected with the domestic electric source, and contains an electric box for supplying electric current to the air-conditioner 403 and the leg heater 405. The unit case 733 contains an inside air circulating duct 735 which is connected with the toilet room 20, and an outside air circulating duct 736 which is separated from the inside air circulating duct 735 with interstructures or the like and is connected with the outside of the toilet room 20. A refrigerating cycle of the air-conditioner 403 comprises a compressor 730a for a refrigeration medium, a heat exchanger 730b for the inside of the room, a heat exchanger 730c for the outside of the room, a four-direction valve 730d, a vacuum device (not shown), and refrigeration medium pipes (not shown) for connecting the above components with each other. The compressor 730a may compress the refrigeration medium sucked, and discharge the refrigeration medium with a high temperature and a high pressure. The heat exchanger 730b for the inside of the room is disposed within the inside air circulating duct 735, and serves as a condenser to cool and condense the refrigeration medium having a high temperature and a high pressure and supplied from the compressor 730a upon a heating operation. The heat exchanger 730c for the outside of the room is disposed within the outside air circulating duct 736, and serves as an evaporator to evaporate the refrigeration medium having a low temperature and a low pressure and supplied from the vacuum device by absorption of the heat from the atmosphere. The four-direction valve 730d changes the flow directions of the refrigeration medium, and the refrigeration cycle from the heating operation to the cooling operation, and vice versa. The vacuum device reduces the pressure of the refrigeration medium. The inside air circulating duct 735 contains the heat exchanger 730d for the inside of the room, and a blower 735a for the inside of the room. By the blower 753a, the air present inside the room 20 is sucked from an intake vent 735c having a filter 735b, blown to the heat exchanger 730b for the inside of the room, and then blown from the outlet 735d to the inside of the toilet room 20. The filter 735b comprises a foam material which can adsorb the dust, and further may contain a deodorizer such as an activated carbon or an aromatic to neutralize the toilet odor. The outside air circulating duct 736 contains the heat exchanger 730c for the outside of the room, and a blower 736a for the outside of the room. By the blower 736a, the air present outside the toilet room 20 is sucked from an intake vent 736b, blown to the heat exchanger 730c for the outside of the room, and discharged from the outlet 736c to the outside of the toilet room. On the front surface of the unit case 733, a grille 733a is disposed to cover the intake vent 735c (having the filter 735b) and the outlet 735d. When the PTC heater 453 is turned on, the air passing through the ventilating duct 404 is heated by the PTC heater 453. The leg heater 405 is attached to the reinforced iron plate 726b with bolts so that the warm air outlet 426a of the heater case 426 is connected with the inlet 426a of the warm air duct 4, at the rear end of the water closet 1. When the user enters the toilet room 20 and sits down on the toilet seat 22 on the water closet 1, the resistance of the seat switch 27 is changed by the weight of the user. The seat switch 27 is disposed under the toilet seat 22 of the water closet 1. The seat switch 27, when detecting the user sitting down on the seat, sends a signal to a control device (not shown) to turn the blower 452 and the PTC heater 453 on, and the air-conditioner 403 off. Further, the seat switch 27, when detecting the user standing up from the seat, sends a signal to the control device to turn the blower 452 and the PTC heater 453 off and the air-conditioner 403 on. By virtue of the above structure, the heating means is changed from the air-conditioner 403 to the PTC heater when the user enters the toilet room, and so, the cool touch caused by the warm air having a relatively low temperature and blown out from the air-conditioner can be avoided. Further, the warm air heated by the PTC heater 453 and having a relatively high temperature is brought into contact with the exposed legs of the user, and so the user is rapidly heated, concentratedly at the portion where the user particularly feels cool. The temperature in the toilet room 20 can be maintained if the operation of the air-conditioner 403 is stopped, whereby the user can enjoy the comfortable atmosphere from the entrance to the exit. The PTC heater 453 is operated for a relatively short period of time when the user is in the toilet room 20, so the cost for the operation may be moderate. The temperature when the toilet room is not employed is preset to a level where the user does not feel warm or cool, and the legs of the user can be heated when the seat switch is on. In this embodiment, the cost saving may be improved. The present invention also relates to a prefabricated toilet room unit wherein the water closet unit is installed. The prefabricated toilet room unit can be manufactured by a conventional method, using the water closet unit as mentioned above.

Claims: 1. A sitting-type water closet (1) comprising: a toilet bowl (2) and at least one warm air duct (4) having a warm air outlet (5); characterized in that said warm air outlet (5) opens outside the toilet bowl (2) at a lower portion thereof; and there is a warm air guiding groove (8) which extends from the warm air outlet (5) to the front of the bowl (2) with a width gradually broadening toward the front, so as to guide the warm air to the area in front of the bowl (2). 2. A water closet according to claim 1, wherein the warm air duct (4) extends horizontally and/or downwardly towards the outlet (5). 3. A water closet according to claim 1 or 2 wherein at least a portion of a warm air path passes at the level of the water surface in the bowl. 4. A water closet according to claim 1, 2 or 3 including a warm air generator (12) connected to the warm air duct (4), and a seat switch (27) for controlling the generator (12) disposed between the upper surface of the bowl (2) and a toilet seat (22). 5. A water closet according to claim 4, wherein the generator (12) comprises a blower (382) and an electric heater (381), and a controlling device (29) is provided which is arranged when actuated via the seat switch to apply an electric current to the electric heater (381) when a user of the water closet sits down on the toilet seat (22), and to restrain the amount of air from the blower (382) until a given period of time elapses. 6. A water closet according to claim 1 including a warm air generator (12) comprising a blower (452) and a positive thermistor cell (453) connected with the water closet, and an intake vent for the warm air duct which is provided for extending outside of the toilet room. 7. A water closet according to claim 1, including a warm air generator (12) comprising a blower (452) and a positive thermistor cell (453) connected with the water closet, and a safety means arranged to stop the application of an electric current to the positive thermistor cell when the positive thermistor cell reaches a predetermined temperature. 8. A water closet unit (501) which can be mounted within a toilet room, comprising: an adapter (49) having a means to be fixed to a wall of the toilet room; a warm air generator (12); and a sitting type water closet (1) having a warm air duct (4) for conveying warm air to an outlet (5) at the front of the water closet (5), the water closet (1) being adapted to be attached at the rear portion thereof to the adapter (49). 9. A water closet unit (501) according to claim 8 wherein the water closet (1) is as defined in any of claims 1-7. 10. A water closet unit (501) according to claim 8 or 9 wherein the water closet (1) is attached to the adapter (49) with bolts through a fixing plate (541) which is fixed onto the adapter (49) and carries nuts threadedly fitted to the bolts. 11. A water closet unit (501) according to claim 8 or 9 wherein the water closet (1) is attached to the adapter (49) with nuts through a fixing plate (54) which is fixed onto the adapter and carries bolts threadedly fitted to the nuts. 12. A water closet unit (501) according to claim 8 or 9 wherein a warm air outlet (286) is further provided on the side wall of the adapter (54) at a height lower than that of the top of the water closet. 13. A water closet unit according to claim 8 or 9 further comprising: (a) a whole room heating device for general heating of the toilet room; (b) a sensor device for detecting an entrance into and an exit from the toilet room by a user thereof; and (c) a control device which ceases an operation of the whole room heating device, and, at the same time, actuates the warm air generator (12) included in the water closet unit (501) to thereby perform local heating, when the sensor device detects the entrance of the user, and on the other hand, which actuates the whole room heating device, and, at the same time, ceases the warm air generator to thereby stop the local heating, when the sensor device detects the exit of the user. 14. A water closet unit (501) which can be mounted within a toilet room, comprising: an adapter (49) having a means to be fixed to a wall of the toilet room, a warm air generator (12) and, at the front of the adapter (4a), a warm air outlet (286); the unit also including a sitting type water closet (1) as defined in claim 1, and the adapter (49) is arranged to supply warm air from the generator (12) into the warm air duct (4); the water closet (1) being adapted to be attached at the rear portion thereof to the adapter (49) at the front thereof so that the height of the warm air outlet is lower than that of the top of the water closet. 15. A prefabricated toilet room including the water closet unit according to any of claims 8-15.

Inventors: ENDO, MAKOTO, KAWAMOTO, RYUICHI, KOMACHI, HIROSHI, NARITA, NAOMASA, SAITO, SHIRO, TAGUCHI, YASUHISA, ZAIZEN, REIGI
Applicants: INAX CORPORATION, NIPPONDENSO CO., LTD.
Application year: 1989
Main classification: E03D9
IPC codes: E03D9, F24H3