Patent Publication Number: US-9422705-B2

Title: Movable flushable toilet bowl

Description:
BACKGROUND 
     1. Field of the Invention 
     The present invention relates to portable toilets, more particularly, to a flushable portable toilet capable of transporting the waste from the portable toilet to a conventional waste system by flushing. 
     2. Description of the Related Art 
     Currently, the US population numbers over 300 million. With a population that has a high percentage of elderly, obese, and diabetic members, many will eventually suffer from mobility problems including problems with gait, knee problems, hip and other skeletal, joint, and muscles issues that hinder mobility. For example, approximately 25% of the population is made up of senior citizens that have varying levels of such mobility problems depending on their age. Approximately 30% of adults suffer from obesity that results in damage primarily to their knees and joints. Furthermore, approximately 25% of the population suffers from diabetes, which in extreme cases causes amputations of the feet and legs. All these problems create physical disabilities for individuals; thus making it difficult to get to a bathroom and use a fixed toilet. 
     At private homes or nursing homes, there can be many reasons that people with reduced mobility have trouble getting to the bathroom, for example: (a) The bathroom may be too far for someone who has trouble walking or pain in their legs; (b) Stroke and heart attack patients may not have full use of their arms and legs to get into the bathroom; (c) Bathroom can be too small in homes therefore being difficult to enter with a wheelchair, walker, cane, etc.; (d) Some people may have enough strength to get out of bed and stand, but not enough strength to walk to the bathroom; (e) Some individuals may have lost one or both legs (diabetes); (f) Some people may have trouble with bladder retention and need the toilet close by for quick access; (g) Some people may be too old and may not have enough strength to travel more than a few steps to get to the toilet; and, (h) Some people may use the bathroom very frequently throughout day. 
     In hospitals, a hospital patient, who is not confined to a bed, may rely on a shared bathroom located at a distance from his or her bed. As the patient walks the distance to the bathroom, especially at night, there is an increased risk of injury for the patient. If a patient is confined to a bed, this patient requires assistance from a caregiver to transfer them from a bed to a bathroom. 
     In all these situations getting to a bathroom may be so difficult for some people with reduced mobility that it may often be easier for the disabled individual or the caregiver to deal with a waste collection device located within the bedroom of the individual. Presently, the available waste collection devices include bedpans, commode chairs, and portable toilets. These devices are generally the only products available to help bring a toilet near a disabled person. A common problem with such devices is the step of removal of the waste, i.e., urine and feces and sterilization of the device for reuse. It is an extremely unpleasant chore especially for caretakers, nurses, and family members to have to clean these devices after use. In a standard home, it is not practical to wash these devices in sinks, bathtubs, showers, in the backyard, etc. First the feces and urine have to be poured into a regular or fixed toilet for flushing; then the device has to be washed and sterilized. The emptying and cleaning process can be often exacerbated due to unsanitary splashing during disposal of the waste. The splashing of the waste products around tends to create an additional mess that is difficult to manually clean. 
     As such, dealing with waste collection devices is always messy, unpleasant, and unsanitary because they may spread bacteria to other parts of the home. Therefore, alternative methods and devices are desired which are sanitary and convenient for a user with reduced mobility and which reduce the need for an attendant or a caregiver to handle waste for disposal and offer low maintenance and efficient cleanup by the caretaker. 
     SUMMARY 
     One aspect of the present invention includes a portable toilet system including a stationary docking unit including a sewer port and a water tank with a flush mechanism, and a mobile toilet unit including a toilet bowl formed on a mobile base, wherein the mobile toilet unit is configured to be attached to the stationary docking unit after used by a user so that the toilet bowl is flushed with water from the water tank by activating the flush mechanism so as to remove waste from the toilet bowl and discharge the waste through the sewer port of the stationary unit. 
     Another aspect of the present invention includes a flushable portable toilet including an upper section including a toilet bowl, a lower section including a wheelbase to move the toilet bowl between a use-location and a cleaning-location, a water inlet disposed adjacent an upper end of the toilet bowl, and a waste outlet disposed adjacent a bottom end of the toilet bowl, the waste outlet is closed when the toilet bowl is moved to the use-location, wherein at the cleaning-location the water inlet is adapted to receive a water flow through a sealed communication from an external flush tank to flush the toilet bowl to move waste through the waste outlet which is adapted to discharge the waste through a sealed communication to an external sewer port. 
     Yet another aspect of the present invention includes a method of human waste disposal to assist people having mobility problems including receiving waste in a portable toilet bowl having a wheelbase at a use-location, moving the portable toilet bowl on the wheelbase from the use-location to a cleaning-location, connecting the portable toilet bowl to an external water outlet so as to allow water to enter into the portable toilet bowl, connecting the portable toilet bowl to an external waste discharge port, and flushing the portable toilet bowl with the water from the external water outlet so as to purge the waste out of the portable toilet bowl through the external waste discharge port. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       These and other aspects and features of the present invention will become apparent to those of ordinary skill in the art upon review of the following description of specific embodiments of the invention in conjunction with the accompanying figures, wherein: 
         FIG. 1A  is a schematic side view of an embodiment of a flushable portable toilet in a use-location; 
         FIG. 1B  is a schematic side view of the flushable portable toilet shown in  FIG. 1A  in a cleaning-location, wherein the flushable portable toilet has been connected to a waste water inlet and a water outlet; 
         FIG. 2A  is a schematic side view of an embodiment of a flushable portable toilet system including a stationary unit and a movable flushable toilet bowl shown at a cleaning-location, wherein the movable flushable toilet bowl has been attached to the stationary unit at the cleaning-location; 
         FIG. 2B  is a schematic frontal view of the movable flushable toilet bowl shown in  FIG. 2A ; 
         FIG. 2C  is a schematic view showing that the movable flushable toilet bowl has been detached from the stationary unit and taken to a use-location to be used by a user; 
         FIG. 2D  is a schematic view showing that the movable flushable toilet bowl has been returned to the cleaning-location from the use-location and attached to the stationary unit to be flushed and cleaned; 
         FIGS. 3A-3C  are schematic top views exemplifying an embodiment of a method of using the portable toilet system of the present invention shown in  FIGS. 2A-2C ; 
         FIGS. 4A-4D  are schematic illustrations of a ball valve used in the present invention; 
         FIGS. 5A-5C  are schematic illustrations showing and an embodiment of a water outlet of the stationary unit and an embodiment of a water inlet of the movable flushable toilet bowl; and 
         FIGS. 6A-6C  are schematic illustrations showing an embodiment of a waste water outlet of the movable flushable toilet bowl and an embodiment of a waste water inlet of the stationary unit. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The present invention provides embodiments of a mobile flushable waste disposal apparatus and system designed primarily for people with mobility health problems or other health problems that prevent such individuals from using conventional bathrooms in homes, hospitals, healthcare centers or nursing homes or other care facilities. 
     A mobile flushable waste disposal apparatus of the present invention may be designed to facilitate waste disposal in conjunction with a stationary unit or a docking station including a waste fluid inlet or sewer port and a fresh fluid outlet preferably connected to a fresh fluid tank including a flush mechanism. The stationary unit may preferably be located in a bathroom of where an individual with mobility problems lives or stays. The mobile flushable waste disposal apparatus may include a waste container or receptacle for example, a bowl formed on a mobile base including, for example, wheels or rollers or the like. It will be appreciated that the term bowl is not intended to limit the shape of the waste container; therefore the container may have any shape or geometry. At an upper section of the bowl, there may be a fresh fluid inlet configured to provide fresh fluid for the bowl when the bowl is flushed, a waste fluid outlet at a lower section of the bowl to discharge the waste fluid when the bowl is flushed and a bowl lid to cover the bowl when not used. The fresh fluid may refer to a liquid including water or fresh water or alternatively water containing a cleaning solution such as a cleaning detergent or bleach. The waste fluid refers to any such liquids with waste product deposited by the user of the apparatus. In one example, the mobile flushable waste disposal apparatus may stay in the bedroom of the individual suffering from reduced mobility and in close proximity of his or her bed so as to allow him or her to safely use the mobile flushable toilet when needed. For example, the mobile flushable waste disposal apparatus may stay in the bedroom of the individual throughout the night to allow him or her to use it conveniently many times without needing to walk to the bathroom. A seat cover or top lid may substantially seal top of bowl opening so as not to allow unpleasant odors from the bowl to spread inside the bedroom. 
     After one or more uses, the mobile flushable waste disposal apparatus with the deposited human waste such as feces and/or urine may be moved using the mobile base of the apparatus to the bathroom and connected to the stationary unit. The mobile flushable waste disposal apparatus may be connected to the stationary unit by connecting the waste fluid outlet of the bowl to the waste fluid inlet of the stationary unit and the fresh fluid outlet of the stationary unit to the fresh fluid inlet of the bowl. Once connected to the stationary unit, the bowl may be flushed with the fresh fluid from the fresh fluid tank to purge any waste remaining in the bowl through the waste outlet of the bowl into waste fluid inlet which may be connected to a sewage system of the building. After flushed and cleaned, the mobile flushable waste disposal apparatus may be again disconnected from the stationary unit and taken to the bedroom to be reused. 
       FIG. 1A  shows an embodiment of a mobile flushable waste disposal apparatus designed as a mobile flushable toilet  100  of the present invention. As shown in  FIG. 1A , the mobile flushable toilet  100 , having a front side  103 A and a rear side  103 B, may include a waste bowl  102  formed on a bowl support  104  having a mobile base  106  that facilitates moving or transporting the mobile flushable toilet  100  from a use-location such as a bedroom of a user or person to a waste disposal location or cleaning-location such as a bath room and vice versa. The mobile base  106  may include wheels  108  or rolls to move the mobile flushable toilet  100  on a floor  110  of a building (not shown). 
     Referring to  FIG. 1A , the waste bowl  102  of the mobile flushable toilet  100  may have an upper section  102 A including an upper opening  112 A for receiving a waste product from the user into the waste bowl  102 . The upper opening  112 A of the waste bowl  102  may be surrounded by a rim  114  under which a flush passage  116  is formed. The flush passage  116  may be connected to an inlet port  118 A or inlet of the waste bowl  102  to receive the flushing fluid. The inlet port may be located at the rear side  103 B of the mobile flushable toilet  100 . The flush passage  116  may include a plurality of holes  120  designed to allow the flushing fluid to flow inside the waste bowl  102 . A bowl seat  121  with a lid  122  may be hingeably attached to the rim  114  at the rear side  103 B of the mobile flushable toilet  100 . The bowl seat  121  and the lid  122  effectively seals the upper opening  112 A of the waste bowl  102  when the lid is closed after the user deposits a waste product (not shown) into the waste bowl. Fluid surface  123  defines an approximate level of the fluid within the waste bowl  102  before the use or the fluid containing the waste product, i.e., waste fluid, after the use. 
     The lower section  102 B of the waste bowl  102  includes a lower opening  112 B connected to a discharge port  118 B through a waste pipe  124  or trap line. The discharge port  118 B may be located at the rear side  103 B of the mobile flushable toilet  100 . The waste pipe  124  allows waste to be carried from the interior of the waste bowl  102  to the discharge port  118 B with the flushing fluid and out of the mobile flushable toilet  100  when the waste bowl  102  is flushed. A discharge valve  126  disposed within the discharge port  118 B, which may be manually activated, may be used to open and sealably close the discharge port  118 B. The discharge valve  126  is turned off before the mobile flushable toilet  100  is moved to the use-location and kept in closed position during the use. Once the mobile flushable toilet  100  is used by the user and the waste product is collected within the waste bowl  102 , the mobile flushable toilet  100  may be moved back to the cleaning-location. 
     As shown in  FIG. 1B , at the cleaning-location, the mobile flushable toilet  100  may be positioned adjacent a docking structure  130  including a flushing fluid outlet  132 A and a waste fluid inlet  132 B or sewer port. The flushing fluid outlet  132 A is connected to a flush tank (not shown) or a fluid pressure system, and the waste fluid inlet  132 B is connected to a waste fluid or sewer drain (not shown). The docking structure  130  may be a bathroom wall portion including the flushing fluid outlet  132 A and the waste fluid inlet  132 B. The flushing fluid outlet  132 A may include an outlet valve  134 , which may be manually activated, and may be used to open and sealably close the flushing fluid outlet  132 A to control the fluid flow. As the mobile flushable toilet  100  is positioned adjacent the docking structure  130 , the inlet port  118 A and the discharge port  118 B of the waste bowl  102  are connected to the flushing fluid outlet  132 A and the waste fluid inlet  132 B, respectively, in a water-tight sealed manner. In order to flush the waste bowl  102 , both the discharge valve  126  and the outlet valve  134  are placed in an open position, and a flush mechanism (not shown) is activated. Flushing fluid depicted with arrows ‘A’ from the flushing fluid outlet  132 A and through the outlet valve  134 , which is in the open position, flows into the interior of the waste bowl  102  through the inlet port  118 A. The flushing fluid ‘A’ released into the waste bowl  102  causes flushing action and purges the waste fluid depicted with arrows ‘B’ from the waste bowl  102 . With the flushing action, the waste fluid ‘B’ including the waste product flows through the discharge port  118 B and through the discharge valve  126 , which is in an open position, and into the waste fluid inlet  132 B. In this respect, the flushing fluid may be water, i.e., fresh water, or a mixture of water and a cleaning solution which may include disinfectants or bleach. The waste fluid may be water containing any amount or type of waste product. The flushing action also introduces fresh fluid into the waste bowl  102  preparing it for another use. After flushing the waste bowl  102 , both the outlet valve  134  and the discharge valve  126  are turned off and the mobile flushable toilet  100  may be disconnected from the docking structure  130  by pulling forward and taken to the use-location by wheeling it on the floor  110 . 
       FIGS. 2A-2D  show an embodiment of a mobile flushable waste disposal system  200  including a mobile flushable toilet  200 A and a stationary unit  200 B or a docking structure. Referring to  FIG. 2A , the mobile flushable toilet  200 A is shown as connected to the stationary unit  200 B at a cleaning or waste disposal location, such as a bathroom. As in the previous embodiment described above, the mobile flushable toilet  200 A, having a front side  203 A and a rear side  203 B, may include a waste bowl  202  formed on a bowl support  204  having a mobile base  206  that facilitates moving or transporting the mobile flushable toilet  200 A from the use-location, e.g., bedroom, to the cleaning-location, e.g., bathroom, and vice versa. The mobile base  206  may include wheels  208  or rolls to move the mobile flushable toilet  200 A on a floor  210  of a building (not shown). In one embodiment there may be six wheels  208  or rollers, which may be coated with rubber. 
     Referring to  FIG. 2A , the waste bowl  202  may have an upper section  202 A including an upper opening  212 A for receiving waste product into the waste bowl  202 . A rim  214  surrounds the upper opening  212 A of the waste bowl  202 . A flush passage  216  formed under the rim  214  may be connected to an inlet port  218 A or inlet to receive the flushing fluid. The inlet port may be located at the rear side  203 B of the mobile flushable toilet  200 A. The flush passage  216  may include a plurality of holes  220  designed to allow the flushing fluid to flow inside the waste bowl  202 . A combination of a bowl seat  221  with a lid  222  may be hingeably attached to the rim  214  at the rear side  203 B. The bowl seat  221  and the lid  222  effectively seals the upper opening  212 A of the waste bowl  202  when the lid  222  is closed after the user deposits a waste product (not shown) into the waste bowl  202 . There may be a seal, such as a rubber seal (not shown) between the rim  214  and the bowl seat  221 , and also between the bowl seat  221  and the lid  222  to effectively the seal the waste bowl  202  during transportation or when not used. The seal prevents any leakage of fluid or unpleasant odors. Fluid surface  223  exemplifies an approximate level of the fluid within the waste bowl  202  before the use or the fluid containing the waste product, i.e., waste fluid, after the use. 
     The lower section  202 B of the waste bowl  202  includes a lower opening  212 B connected to a discharge port  218 B through a waste pipe  224  or trap line. The discharge port  218 B may be located at the rear side  203 B of the mobile flushable toilet  200 A. The waste pipe  224  allows waste product to be carried from the interior of the waste bowl  202  to the discharge port  218 B with the flushing fluid and to the exterior of the mobile flushable toilet  200 A when the waste bowl is flushed. A discharge valve  226  disposed within the discharge port  218 B, which may be manually activated, may be used to open and sealably close the discharge port  218 B. The discharge valve  226  is turned off before the mobile flushable toilet  200 A is moved to the use-location and kept in closed position during the use. 
     As shown in  FIG. 2B , in a frontal view of the mobile flushable toilet  200 A from the front side  203 A, a first width W 1  of the mobile flushable toilet  200 A is less than the second width W 2  to form a wider base and thus better balance the mobile flushable toilet  200 A. The first width W 1  may be the width of the upper section  202 A of the waste bowl  202  such as the width of the rim  214  surrounding the upper opening  212 A, and the second width W 2  may be the width of the mobile base  206  of the bowl support  204  as shown in  FIG. 2B . 
     Referring back to  FIG. 2A , at the cleaning-location, the mobile flushable toilet  200 A may be connected to the stationary unit  200 B and may be kept together using mechanical locks  238  and by placing them in a lock position. The stationary unit  200 B located at the cleaning-location may include a flush tank  201 A holding flushing fluid and a base  201 B including a flushing fluid outlet  232 A and a waste fluid inlet  232 B or sewer port. In this embodiment, the flush tank  201 A may be connected to the flushing fluid outlet  232 A through a fluid pipe  240 . Fluid flow from the flush tank  201 A into the fluid pipe  240  is controlled by a flush tank valve  242 . The flush tank valve  242  may be activated by a flush mechanism  244  to release the fluid stored within the flush tank  201 A for flushing the waste bowl  202 . The flushing fluid outlet  232 A may include an outlet valve  234 , which may be manually activated, and may be used to open and sealably close the flushing fluid outlet  232 A to control the fluid flow. The waste fluid inlet  232 B or sewer port is connected to a waste fluid drain  246  or sewer drain. As shown in  FIG. 2A , when the two components, the mobile flushable toilet  200 A and the stationary unit  200 B of the system  200  are connected, the inlet port  218 A and the discharge port  218 B are connected to the flushing fluid outlet  232 A and the waste fluid inlet  232 B, respectively, in a water-tight sealed manner. In order to flush the waste bowl  202 , both the discharge valve  226  and the outlet valve  234  are placed in an open position, and the flush mechanism  244  is activated to release the flushing fluid. Optionally, a spray system (not shown) may be placed within the waste bowl  202  adjacent the rim  214  and under the combination of a bowl seat  221  with a lid  222 . Before flushing the waste bowl  202 , the spray system may be used to spray water, or water including a cleaning solution, under the lid and interior of the rim  214  to clean their surfaces. At this connected state, the system  200  may function as a standard flushable toilet if needed. 
     Referring to  FIG. 2C , after turning off both the outlet valve  234  and the discharge valve  226 , and after unlocking the mechanical locks  238 , the mobile flushable toilet  200 A may be disconnected from the stationary unit  200 B by pulling forward and moved to the use-location on the mobile base  206 . Once the mobile flushable toilet  200 A is used by the user and the waste product is collected, the mobile flushable toilet  200 A may be moved back to the cleaning-location for flushing and cleaning service. Although not shown in the figures, each of the flushing fluid outlet  232 A, sewer port  232 B, inlet port  218 A and discharge port  218 B may have lids to cover their openings when the mobile flushable toilet  200 A is separated from the stationary unit  200 B. 
     Referring to  FIG. 2D , at the cleaning-location, the mobile flushable toilet  200 A may be connected to the stationary unit  200 B as described above with respect to  FIG. 2A , and the mechanical locks  238  are locked. After turning on both the outlet valve  234  and the discharge valve  226 , the waste bowl  202  having the waste product is flushed as described above. Flushing fluid depicted with arrows ‘A’ from the flushing fluid outlet  232 A and through the outlet valve  234 , which is in the open position, flows into the interior of the waste bowl  202  through the inlet port  218 A to replace the waste fluid collected therein. The flushing fluid ‘A’ released into the waste bowl  202  causes flushing action and purges the waste fluid depicted with arrows ‘B’ from the waste bowl  202  through the discharge port  218 B and through the discharge valve  226 , which is in the open position, into the sewer port  232 B and the waste fluid drain  246 . The flushing action also introduces fresh fluid into the waste bowl  202  preparing it for another use. After flushing the waste bowl  202 , both the outlet valve  234  and the discharge valve  226  are placed into closed position and the mobile flushable toilet  200 A may be disconnected from the stationary unit  200 B by pulling forward and taken to the use-location by wheeling it on the floor  210 . If so desired, the mobile flushable toilet  200 A may also be kept attached to the stationary unit  200 B at the cleaning-location to use it as a standard flushable toilet. As mentioned above, the flushing fluid may be water, i.e., fresh water, or a mixture of water and a cleaning solution which may or may not include disinfectants or bleach. The waste fluid may be water containing any amount or type of waste product. 
     Alternatively, a mobile flushable waste disposal system may be fully automatic and may be controlled by an electronic control system. In such system, the mobile flushable toilet may be separated from the docking station with a press of a button to activate release. When the toilet bowl separates from docking station, valves of the system may be automatically shut off to prevent leakages. When the mobile flushable toilet is returned to docking station, it clicks into a locking position and automatically deactivates the valves for the water inlet and drain so that bowl is fully connected to plumbing in the docking station and can be ready for flushing. 
       FIGS. 3A-3C  illustrate an embodiment of an exemplary operation of the mobile flushable waste disposal system  200  including the mobile flushable toilet  200 A and the stationary unit  200 B or a docking unit in a building  300 . The building  300  may include a cleaning-location  300 A or a waste disposal location such as a bathroom separated from a use-location  300 B, such as a bedroom of a user or person with reduced mobility, by a divider structure  300 C. The divider structure  300 C may be a wall separating the locations  300 A and  300 B, or a plurality of rooms between the locations  300 A and  300 B. As shown in  FIG. 3A , at the cleaning-location  300 A the mobile flushable toilet  200 A and the stationary unit  200 B are connected and the mobile flushable toilet  200 A is flushable. As shown in  FIG. 3B , the mobile flushable toilet  200 A is separated from the stationary unit  200 B as described above, and wheeled into the use-location  300 B to be used by the user. Once the mobile flushable toilet  200 A is used and the waste product is collected therein, the mobile flushable toilet  200 A is wheeled back to the cleaning-location  300 A. As shown in  FIG. 3C , at the cleaning-location  300 A, the mobile flushable toilet  200 A and the stationary unit  200 B are reconnected so that the mobile flushable toilet  200 A can be flushed. In one configuration, the cleaning-location  300 A may house a plurality of mobile flushable waste disposal systems having mobile flushable toilets and the stationary units to distribute one or more mobile flushable toilets to a plurality of use-locations, such as patient rooms in a hospital. In another configuration, the disposal location  300 A may house only one or two stationary units and a plurality of mobile flushable toilets using the same stationary units. For example, the cleaning-location may have only one stationary unit but more than one mobile flushable toilets using the stationary unit to get flushed and for discharging the waste after returned from the use-locations. In this configuration, the mobile flushable toilets which are not used in the use-locations are stored in the cleaning-location or in a storage location in a ready to use clean state so as to be used when needed. 
       FIGS. 4A-4D  show an exemplary valve  400  which may be used as either an outlet valve or a discharge valve, such as the valves  134  and  126  shown in  FIGS. 1A-1B  or the valves  234  and  226  shown in  FIGS. 2A-2D . Referring to  FIG. 4A , the exemplary valve  400  may be a ball valve including a chamber  402  or seat formed within a flow channel  404  through which a fluid or liquid, such as water, or a waste water, water with waste product, flows depending on the location of the valve. As can be seen in  FIG. 4B , the chamber  402  is generally a spherical chamber housing a flow element  406  which is a ball shaped element conforming to the spherical shape of the chamber  402 . The flow element  406  is connected to an external lever  408  which may move or rotate the flow element  406  into a closed position or an open position. The flow element  406  includes an orifice  410  permitting fluid flow through the flow element  406  only when the orifice  410  is aligned with the flow channel  404  by rotating the flow element within the chamber  402  using the external lever  408 . 
     Referring to  FIG. 4C , the orifice  410  is aligned with the flow channel  404  and thereby permits fluid flow through the flow element  406 ; hence the valve is in an open position. Referring to the  FIG. 4D , by turning the flow element lever  408  for example 90 degrees by a quarter turn, the orifice  410  is no longer aligned with the flow channel and does not permit fluid flow through the flow element  406 ; hence the valve is in a closed position. These features of the ball valve  400  may be advantageously used for the outlet and the discharge valves of the present invention. 
       FIG. 5A  shows an exemplary flushing fluid outlet  432 A which may be used with the above embodiments. The flushing fluid outlet  432 A of a stationary unit may include a fresh fluid valve  434  and a first seal  420 A, which may be a flexible sealing material such as rubber or silicone surrounding the opening of the flushing fluid outlet  432 A. As shown in  FIGS. 5B  and  5 C, the first seal  420 A water-tight seals the connection between the flushing fluid outlet  432 A and the inlet port  418 A of the mobile flushable toilet for example when the mobile flushable toilet is connected to the stationary unit as described above and prevents any fluid leakage or dripping. 
       FIG. 6A  shows an exemplary discharge port  418 B which may be used with the above embodiments. The discharge port  418 B may include a discharge valve  426  and a second seal  420 B, which may be a flexible sealing material such as rubber or silicone. When the movable flushable toilet is being moved around, the discharge valve  426  is turned off and prevents any dripping. As shown in  FIGS. 6B and 6C , the second seal  420 B water-tight seals the connection between the discharge port  418 B and the waste fluid inlet  432 B for example when the movable flushable toilet is connected to the stationary unit as described above and prevents any waste fluid leakage or dripping. When the movable flushable toilet is in a use-location, a lid  433  covers and seals the waste fluid inlet  432 B. 
     The mobile flushable toilet or portable toilet of the present invention can help people, especially people having mobility problems, gain easier access to a toilet. The mobile flushable toilet can be shaped, sized and manufactured like a standard toilet so that a person can conveniently use it in his bedroom with the same comfort. The mobile flushable toilet of the present invention can be easily rolled out of a bathroom to another part of the house, utilized like a standard toilet by a person that has trouble getting to the bathroom, rolled back to the bathroom into its original position, and finally flushed like a standard toilet. The wheels underneath the mobile flushable toilet can advantageously enable the mobile flushable toilet to leave docking station and travel to other locations within the home for use. The invention also eliminates the difficult, unsanitary, and unpleasant manual cleaning of urine and feces required by existing prior art portable toilets because it can be flushed like a standard toilet. The mobile flushable toilet system may also have the following features and advantages: (a) the wheels underneath the mobile bowl may have locks so that there is no movement of the toilet bowl when person is sitting down or getting up; (b) the water inside toilet bowl may have standard scented chemicals to kill bacteria and suppress odors of urine and feces inside bowl when used; (c) The toilet seat and lid may have an air tight seal when in the closed down position to contain urine and feces odors inside the toilet bowl; (d) when the mobile flushable toilet is attached to the docking station or when the mobile flushable toilet is connected to a standard home sewer drain and water supply, it is no different than any standard toilet in use and appearance (prior art mobile flushable toilets do not have this feature, which are basically independent holding containers). 
     Optionally, a mobile flushable toilet with a low bowl may be used for small children, which can be connected to the same docking station. Once the child gets taller he or she can start using the standard bowl size. If a home only has one bathroom, extra bowls may be bought and placed in other parts of the home to create additional usable mobile flushable toilets. After used, each bowl can be brought to the docking station to flush. The mobile flushable toilet bowl may have optional arm rests, back rest and hand rail to help with balance when sitting down and getting up from toilet bowl. 
     Although aspects and advantages of the present invention are described herein with respect to certain preferred embodiments, modifications of the preferred embodiments will be apparent to those skilled in the art. Thus the scope of the present invention should not be limited to the foregoing discussion, but should be defined by the appended claims.