EP0371008A2 - Portable toilet with pulsed flush action - Google Patents
Portable toilet with pulsed flush action Download PDFInfo
- Publication number
- EP0371008A2 EP0371008A2 EP90102080A EP90102080A EP0371008A2 EP 0371008 A2 EP0371008 A2 EP 0371008A2 EP 90102080 A EP90102080 A EP 90102080A EP 90102080 A EP90102080 A EP 90102080A EP 0371008 A2 EP0371008 A2 EP 0371008A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- bowl
- portable toilet
- flush water
- flush
- actuating member
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03D—WATER-CLOSETS OR URINALS WITH FLUSHING DEVICES; FLUSHING VALVES THEREFOR
- E03D5/00—Special constructions of flushing devices, e.g. closed flushing system
- E03D5/012—Special constructions of flushing devices, e.g. closed flushing system combined with movable closure elements in the bowl outlet
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03D—WATER-CLOSETS OR URINALS WITH FLUSHING DEVICES; FLUSHING VALVES THEREFOR
- E03D5/00—Special constructions of flushing devices, e.g. closed flushing system
- E03D5/01—Special constructions of flushing devices, e.g. closed flushing system using flushing pumps
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03D—WATER-CLOSETS OR URINALS WITH FLUSHING DEVICES; FLUSHING VALVES THEREFOR
- E03D5/00—Special constructions of flushing devices, e.g. closed flushing system
- E03D5/016—Special constructions of flushing devices, e.g. closed flushing system with recirculation of bowl-cleaning fluid
Definitions
- the illustrated mechanism includes a "pulsing circuit board” which provides two functions, namely it senses low batteries and turns on a warning light before the batteries become too low to operate the flush mechanism. In addition, it turns the pump drive motor on and off to provide the required pulsed flushing action.
- the "pulsing circuit board” is operated to turn the motor off and on at predetermined time intervals, such as every second, so as to obtain a "pulsed flush". This type of flush is desirable in that it provides both high velocity water and low velocity water on the flush ledge of the toilet bowl to provide in turn for a uniform wetting of the bowl by the flush water.
- the improved flush apparatus as illustrated includes an axial flow plump which employs a rotatable propeller which includes a plurality of short spiral vanes.
- a rotatable propeller which includes a plurality of short spiral vanes.
- the vanes push the water upwardly into a spiral cavity within the pump housing which in turn directs the flush water into a tube which lifts the water about 30 cms (12") into the top of the toilet bowl.
- the pump structure is advantageous in that it provides maximum efficiency in terms of use of battery current to lift relatively small amounts of water relatively short distances and pulse it into a toilet bowl. This arrangement provides for prolonged service life of the flush batteries and in addition minimises the need for frequent refilling of the toilet flush water tank.
- a pumping mechanism indicated generally at 26 is provided for pumping fresh water from the water storage chamber 22 into the bowl 16 in order to flush the toilet.
- the bowl 16 includes a bottom discharge opening 28 at its lower end and a flush ledge 30 near its upper end on which flush water is deposited for flow along the ledge and inwardly off the ledge so as to uniformly wet the bowl 16.
- the discharge opening 28 registers with an inlet opening 32 ( Figure 3) in the top wall of holding tank 14. Opening 32 is closed by a slide valve 34 mounted within the interior of the holding tank 14. Because of the separable mounting of the two sections 12 and 14, the holding tank section 14 can be removed for dumping.
- the lower end of the actuator cap skirt 70 is formed at a plurality of circumferentially spaced points with inwardly directed projections 72 which, when the cap 66 is manually telescoped downwardly over the housing 42, will snap over a corresponding number of outwardly extending projections 74 formed on the housing 42.
- the cap 66 is formed of a relatively thin gauge deflectable plastic material so that the skirt 70 will readily deflect outwardly and spring back inwardly as the projections 72 pass over the projections 74.
- the skirt 70 can be manually grasped and squeezed to deflect the lower end of the skirt 70 outwardly so as to enable the projections 72 to pass over the projections 74 when it is desired to remove the actuator cap 66 from the housing 42.
- the low battery indicator circuit 151 includes a voltage detector 154 which is powered by battery voltage flowing through a diode 156.
- the voltage detector 154 provides a constant voltage output at the terminal 158 while the battery voltage is within a given range. If however, battery voltage falls below a predetermined level, the terminal 158 is turned off. The signal from terminal 158 is applied to the base terminal of the transistor 160.
- the emitter of the transistor 160 is at battery voltage once the switch 96 is closed.
- the low battery warning LED 92 is connected between battery ground and the collector of the transistor 160.
- this invention provides a portable toilet 10 which includes a battery operated flush assembly. Furthermore, the battery operated flush assembly provides for a "pulsed" action of the flush water in the toilet bowl 16 to provide for more efficient and improved flushing action. This is accomplished by using the improved axial flow pump which operates to lift relatively small amounts of water relatively short distances and pulse it into the toilet bowl. All of these advantages are obtained while still maintaining efficient use of the batteries that operate the flush mechanism and without risking leaking of the flush water from the toilet during transport.
Abstract
Description
- This invention relates generally to portable toilets and more particularly to a portable toilet which carries its own power supply for operating the flush assembly. US-A-4 641 383 illustrates a portable toilet of the particular type of which this invention relates. It is conventional practice when flushing portable toilets of this type to utilise manually operable pumps of the bellows type for pumping flush water from a water storage tank in the toilet into the toilet bowl. Pumps of the bellows type are illustrated in our prior US-A-3 570 108 and US-A-3 949 430.
- Pumps of the bellows type are low cost items which allow water conversation to be observed and have proved to be satisfactory for the needs of portable toilet users. However, there is a need for improved power operated flush assemblies in portable toilets in order to provide for improved flushing of the toilet and also to provide for more efficient use of the flush water supply and enable the use of portable toilets by handicapped or elderly persons that do not have the strength or other physical ability to operate a bellows pump.
- Our US-A-4 185 337, upon which is based the prior art portion of claim 1, shows a portable toilet with an electrically operated flush apparatus but the flush apparatus illustrated in this patent requires an external source of power and involves a continuous flush which has limitations from an efficiency standpoint.
- It is an object of this invention, as characterised in claim 1, to provide an improved portable toilet with a pulsed flushing action to provide a good flushing action with the minimum use of water.
- The present invention, as exemplified in the following description and illustrated in detail in the drawings, is a portable toilet which includes a flush assembly operated by the batteries carried on the toilet. The battery operated flush mechanism is operated by depressing a hollow cap member, sometimes termed a "palm button" and there is a novel lock and unlock mechanism associated with the palm button that is operable to lock selectively the palm button in a position in which it cannot be depressed to flush the toilet and an unlocked position in which it can be selectively depressed to operate the flush mechanism.
- The illustrated mechanism includes a "pulsing circuit board" which provides two functions, namely it senses low batteries and turns on a warning light before the batteries become too low to operate the flush mechanism. In addition, it turns the pump drive motor on and off to provide the required pulsed flushing action. The "pulsing circuit board" is operated to turn the motor off and on at predetermined time intervals, such as every second, so as to obtain a "pulsed flush". This type of flush is desirable in that it provides both high velocity water and low velocity water on the flush ledge of the toilet bowl to provide in turn for a uniform wetting of the bowl by the flush water.
- In addition, the improved flush apparatus as illustrated includes an axial flow plump which employs a rotatable propeller which includes a plurality of short spiral vanes. When the propeller is rotated rapidly about its axis, the vanes push the water upwardly into a spiral cavity within the pump housing which in turn directs the flush water into a tube which lifts the water about 30 cms (12") into the top of the toilet bowl. The pump structure is advantageous in that it provides maximum efficiency in terms of use of battery current to lift relatively small amounts of water relatively short distances and pulse it into a toilet bowl. This arrangement provides for prolonged service life of the flush batteries and in addition minimises the need for frequent refilling of the toilet flush water tank.
- In the bellows type flush now in common use, it is necessary for the user to apply about a 16 kg (35 lb) force to the bellows. If the force is too hard, the flush water shoots out of the supply tube and over the toilet bowl. If the push is not hard enough, a less than satisfactory flush is obtained. The electric flush assembly of this invention requires about a 2.3 kg (5 lb) push and provides for repeatable uniform wetting and through flushing of the toilet bowl.
- The invention will become further apparent from a consideration of the following description and the appended claims, when taken in connection with the accompanying drawings, in which:
- Figure 1 is a top view of the portable toilet of this invention, with a portion of the seat broken away to show the toilet bowl;
- Figure 2 is an enlarged transverse sectional view of the portable toilet of this invention as seen from substantially the line 2-2 in Figure 1;
- Figure 3 is an enlarged transverse sectional view of the portable toilet of this invention as seen from substantially the line 3-3 in Figure 2;
- Figures 4 and 5 are horizontal sectional views of the flush assembly in the portable toilet of this invention as seen from substantially the lines 4-4 and 5-5, respectively, in Figure 6;
- Figure 6 is an enlarged vertical sectional view of the portion of the toilet shown in figure 1 in which the flush assembly of this invention is embodied;
- Figure 7 is another vertical sectional view of the flush assembly of this invention;
- Figures 8 and 9 are exploded perspective views of portions of the flush assembly illustrated in Figures 6 and 7;
- Figure 10 is a circuit diagram illustrating the electric circuit in the flush assembly of this invention; and
- Figure 11 is a graph illustrating the pulsed flush in the flush assembly of this invention in which voltage and velocity are plotted against time.
- With reference to the drawing, the improved portable toilet of this invention, indicated generally at 10, is illustrated in Figure 1 and 2 as including a
seat section 12 which separably mounts on aholding tank section 14 in a conventional manner. Theseat section 12 includes abowl 16, and anoverlying seat 18 and acover 20 which are hingedly mounted on thesection 12. A flush water storage tank orchamber 22 is provided within the interior ofseat section 12 and if filled with fresh water via a fill port which is covered by aremovable cap 24. - A pumping mechanism indicated generally at 26 is provided for pumping fresh water from the
water storage chamber 22 into thebowl 16 in order to flush the toilet. Thebowl 16 includes a bottom discharge opening 28 at its lower end and aflush ledge 30 near its upper end on which flush water is deposited for flow along the ledge and inwardly off the ledge so as to uniformly wet thebowl 16. The discharge opening 28 registers with an inlet opening 32 (Figure 3) in the top wall ofholding tank 14.Opening 32 is closed by aslide valve 34 mounted within the interior of theholding tank 14. Because of the separable mounting of the twosections holding tank section 14 can be removed for dumping. - The
pump mechanism 26 includes a battery operated pump assembly 36 (Figure 6) which is mounted on theseat section 12 in an upwardly facing opening 38 in what amounts to the right rear corner of thetop surface 40 of theseat section 12. Asealing ring 41 provides for a fluid tight assembly of thepump assembly 36 with theseat section 12. - The
pump assembly 36 includes ahousing 42 which is generally upright and includes acontinuous side wall 44, atop cover plate 46, anintermediate plate 47, and abottom wall 48. Between thewalls housing 42 is fluid tight. Anenclosure 49 below thehousing 42 is open at its lower end and carries asealing closure plate 50 which normally closes the lower end of theenclosure 49. - Between the
plates housing 42 defines abattery chamber 52 and between theplate 47 andbottom wall 48, thehousing 44 defines achamber 54 in which anelectrical motor 56 is housed having a downwardly extendingdrive shaft 58 on which apump propeller 60 is mounted. Thepropeller 60 consists of a bullet shapedbody 62 having shortspiral vanes 64 formed on its outer surface. - Telescoped over the upper end of the
housing 42 is an actuator cap 66, sometimes referred to as a "palm button" because it is intended to be depressed with the palm of the hand. The actuator cap has a top wall 68 and a dependingskirt 70 and is open at its lower end so that it can readily be telescoped over the upper end of thehousing 42. - The lower end of the
actuator cap skirt 70 is formed at a plurality of circumferentially spaced points with inwardly directedprojections 72 which, when the cap 66 is manually telescoped downwardly over thehousing 42, will snap over a corresponding number of outwardly extendingprojections 74 formed on thehousing 42. The cap 66 is formed of a relatively thin gauge deflectable plastic material so that theskirt 70 will readily deflect outwardly and spring back inwardly as theprojections 72 pass over theprojections 74. Similarly, theskirt 70 can be manually grasped and squeezed to deflect the lower end of theskirt 70 outwardly so as to enable theprojections 72 to pass over theprojections 74 when it is desired to remove the actuator cap 66 from thehousing 42. - Four batteries 76 (Figure 9) are mounted on the
plate 47 and housed within thechamber 52. Upright, irregularly shaped,partitions 78 on theplate 47 function to maintain thebatteries 76 in upright positions and also cooperate with thehousing 42 and itsside wall 44 to define an enclosure in which acircuit board 80 is housed, the enclosure having atop wall 82 in which anopening 84 is formed for a purpose to appear presently. - The
circuit board 80 supports most of the components of the electrical circuit indicated generally at 86 in Figure 10. Thecircuit 86 has leads 88 connected to thebatteries 76 and leads 90 connected to theelectric motor 56. Thecircuit 86 also includes awarning light LED 92 which is mounted on thewall 82 in alignment with theopening 84 which is also aligned with an opening 94 in the top wall 68 of the actuator cap 66. Thecircuit 86 also includes amagnetic reed switch 96 which is mounted in thechamber 52 on thewall 44 of thehousing 42 at a position in which, when the actuator cap 66 is depressed, amagnet 98 carried by theactuator cap skirt 70 will actuate theswitch 96 so that it will open and close continuously so long as the cap 66 is maintained in its depressed position. This opening and closing takes place rapidly, for example, on a one-second cycle basis, as illustrated in Figure 11. As will be described in detail hereinafter, such a condition of theswitch 96 will provide for a pulsed flow of flush water from thechamber 22 to thetoilet bowl 16. The function of thelight 92 is to visually warn the toilet user, that thebatteries 76 are low and replacement should be considered. - A
cover plate seal 100 mounts thecover plate 46 on the upper end of thehousing 42 so as to maintain thechamber 52 in fluid tight condition. Acompression spring 102 telescoped over ashort post 103 on theplate 46 is maintained in a compressed condition by aretainer cap 104 which has acentral round projection 105 in a tongue and groove relationship with a downwardly extendingprojection 103 on the top wall 68 of the actuator cap 66. The tongue and groove relationship prevents rotation of the cap 66 on thehousing 42. - A generally
circular thumb wheel 106 has a toothed portion 108 (Figures 6 and 8) which projects transversly through a slot 110 in theactuator cap skirt 70. A cap shapedcentral portion 112 of thethumb wheel 106 telescopes downwardly over theretainer projection 105. This mounting enables rotation of the thumb wheel about theprojection 105. As shown in Figures 6 and 8, thecover plate 46 is formed with a plurality ofupstanding posts 114 which are arranged concentrically around thethumb wheel retainer 104. - As shown in Figure 5, the
posts 114 are vertically aligned with a plurality ofopenings 116 in thethumb wheel 106, in one rotated position of thethumb wheel 106, thereby enabling the actuator cap 66 and thethumb wheel 106 to be moved downwardly relative to theposts 114. This rotated position of thethumb wheel 106 corresponds to an "on" condition of theswitch 96 because it enables the actuator cap 66 to be moved downwardly to a position in which themagnet 98 will actuate theswitch 96. - In another rotated position of the
thumb wheel 106, the portions of thethumb wheel 106 between theopenings 116, are aligned with theposts 114 so that if depression of the actuator cap 66 is attempted, thethumb wheel 106 will engage theposts 114 and prevent movement of themagnet 98 to a position in which it will actuate theswitch 96. Thus, such a moved position of thethumb wheel 106 corresponds to an "off" condition of theswitch 96 and effectively locks the cap 66 in a position in which the toilet can not be inadvertently flushed. - When the actuator cap 66 is depressed to actuate the
switch 96 which energizes themotor 56 so as to drive thedrive shaft 58 so as to rapidly rotate thepropeller 60 about the vertical axis of theshaft 58, it is also necessary to move theclosure plate 50 at the lower end of thehousing 42 to the open position shown in broken lines in Figure 7. As shown in Figure 7 theclosure plate 50 includes ashaft 122 which is rotatably mounted in ahinge 124 formed on the lower end of theenclosure 49. The opposite end of theclosure plate 50 is connected to atension spring 126 which is mounted on theenclosure 49. Thespring 126 maintains theclosure plate 50 in a normally closed position. In order to move theclosure plate 50 to its open position, the closure plate has to be moved against the tension force of thespring 126. - As shown in Figure 4, the
housing wall 44 opposite thebattery chamber 52 has an inwardly extendingportion 130 which provides a vertically extendingspace 132 within the cap 66 to one side of thechamber 52. Anactuating rod 134 for opening theclosure plate 50 in response to downward movement of the actuating cap 66 is provided. Therod 134 has itslower end 136 nested in a cavity in a free end 138 of theclosure plate 50. Therod 134 extends upwardly through theplate 47 and at its upper end carries a yeildable cover member 142 which engages the underside of thecover plate 46. Anactuator rod 140 on the underside of the top wall 68 of the actuator cap 66 is moveable downwardly, in response to depression of the cap 66, through an opening (not shown) in thecover plate 46 to engage thecover member 140 and move theactuating rod 134 downwardly to in turn pivotally move theclosure plate 50 downwardly about theshaft 122 to an open position in which the water in theflush water tank 22 communicates with apump chamber 144 withinhousing 49 in which thepropeller 60 is located. Astop member 143 is adjustably mounted onrod 134 to limit upward movement of therod 134. - Rapid rotation of the
propeller 60 about the vertical axis of thedrive shaft 58 causes water from thetank 22 entering thechamber 144 to be moved rapidly upwardly in thechamber 144 into aspiral chamber 146 thereabove for flow in a horizontal direction into the inlet end of atube 146 which connects the pump to thetoilet bowl 16. Theoutlet end 148 of thetube 146 is positioned directly above and in line with theflush ledge 30. As a result, pulses of water issuing from thetube discharge end 148 will travel around the periphery of thebowl 16 on theledge 30, and as the water moving on theledge 30 loses its momentum, and as the velocity of the water decreases, the centrifugal force of the water that is holding it on theledge 30 and against theouter bowl wall 150 above the ledge 30 (Figure 3) decreases and the water will gradually run off the inner end of theledge 30 and down thebowl 16 toward theoutlet 28 so as to flush the bowl contents through theopening 28 and thoroughly wet the inner surface of thebowl 16 so as to accomplish the desired complete flushing of thebowl 16. The normal high and low water levels in thewater chamber 22 are shown at A and B in Figure 7. - As shown in Figure 11, the
circuit 86 operates to intermittently reduce the voltage of themotor 56 from a maximum value to zero once every second, the time in seconds being indicated by thenumerals toilet 10 by moving thethumb wheel 108 to the "on" position, subsequently depressing the actuating cap 66 and maintaining the actuating cap 66 in a depressed position for a desired period of time necessary to accomplish complete flushing of thebowl 16. The operation of the actuator cap 66 can be repeated over the service life of thetoilet 10 with the knowledge that each flushing cycle will be a predictable repeat of previous cycles. This uniformity of operation is desirable from the standpoint of economic use of water from thetank 22 and economic use of thebatteries 76 over a prolonged service life. - When the
batteries 76 become low enough to consider replacement, but prior to the time the batteries become so low that they will not operate thecircuit 86, the light 92 will so indicate. - The elements and operation of the
circuit 86 will now be described with reference to Figure 10. Thecircuit 86 performs the functions of providing an indication of low battery voltage and modulates the voltage applied to themotor 56 to provide a pulsed water output, as previously described. Thecircuit 86 is divided into two functional subcircuits, a lowbattery indicator circuit 151, and a pulsing circuit 152, both carried by thecircuit board 80. - The low
battery indicator circuit 151 includes avoltage detector 154 which is powered by battery voltage flowing through adiode 156. Thevoltage detector 154 provides a constant voltage output at the terminal 158 while the battery voltage is within a given range. If however, battery voltage falls below a predetermined level, the terminal 158 is turned off. The signal fromterminal 158 is applied to the base terminal of thetransistor 160. The emitter of thetransistor 160 is at battery voltage once theswitch 96 is closed. The lowbattery warning LED 92 is connected between battery ground and the collector of thetransistor 160. - In operation, the
transistor 160 acts as a switch which controls current flow through theLED 92, based on the signal applied by thevoltage detector 154. When theswitch 96 is open, no current flows through theLED 92. When theswitch 96 is closed while the battery voltage is at a high level, thevoltage detector 154 provides a signal which prevents current flow through theLED 92. If, however, battery voltage applied to the emitter terminal goes below a predetermined level,terminal 158 is turned off which allows current to flow throughLED 92 causing it to illuminate. Accordingly, the lowbattery indicator circuit 151 provides a visual indication to the user of a low battery voltage condition. - The pulsing circuit 152 includes three series connected op-amps or
inverters inverter 162 throughresistor 172 from the output ofinverter 164 through acapacitor 168, and from the output ofinverter 166 through a resistor 170. Since the charging of thecapacitor 168 is time dependent, the feedback voltage applied to the invertor 162 changes with respect to time, causing the output frominvertor 166 to be a square wave with its period determined by the values of thecapacitor 168 and theresistors 170 and 172. Thetransistors - From the above description it is seen that this invention provides a
portable toilet 10 which includes a battery operated flush assembly. Furthermore, the battery operated flush assembly provides for a "pulsed" action of the flush water in thetoilet bowl 16 to provide for more efficient and improved flushing action. This is accomplished by using the improved axial flow pump which operates to lift relatively small amounts of water relatively short distances and pulse it into the toilet bowl. All of these advantages are obtained while still maintaining efficient use of the batteries that operate the flush mechanism and without risking leaking of the flush water from the toilet during transport.
Claims (9)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11408187A | 1987-10-27 | 1987-10-27 | |
US114081 | 1987-10-27 |
Related Parent Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19880309695 Division-Into EP0314358B1 (en) | 1987-10-27 | 1988-10-17 | Portable toilet with battery operated flush assembly |
EP19880309695 Division EP0314358B1 (en) | 1987-10-27 | 1988-10-17 | Portable toilet with battery operated flush assembly |
EP88309695.0 Division | 1988-10-17 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0371008A2 true EP0371008A2 (en) | 1990-05-30 |
EP0371008A3 EP0371008A3 (en) | 1991-11-06 |
EP0371008B1 EP0371008B1 (en) | 1992-12-09 |
Family
ID=22353266
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19900102080 Expired EP0371008B1 (en) | 1987-10-27 | 1988-10-17 | Portable toilet with pulsed flush action |
EP19880309695 Expired EP0314358B1 (en) | 1987-10-27 | 1988-10-17 | Portable toilet with battery operated flush assembly |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19880309695 Expired EP0314358B1 (en) | 1987-10-27 | 1988-10-17 | Portable toilet with battery operated flush assembly |
Country Status (5)
Country | Link |
---|---|
EP (2) | EP0371008B1 (en) |
AU (2) | AU602259B2 (en) |
CA (1) | CA1282908C (en) |
DE (2) | DE3861514D1 (en) |
NZ (1) | NZ226382A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0597489A1 (en) * | 1992-11-13 | 1994-05-18 | Kohler Co. | Pump operated plumbing fixture |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4850064A (en) * | 1987-11-09 | 1989-07-25 | Thetford Corporation | Portable toilet with vent for flush water supply tank |
CN111305335A (en) * | 2020-02-26 | 2020-06-19 | 浙江科助达机械科技有限公司 | Toilet and design method |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3015281A (en) * | 1960-02-23 | 1962-01-02 | Cederholm R F D 1 | Portable liquid pump |
US3570018A (en) * | 1968-04-25 | 1971-03-16 | Thetford Corp | Portable toilet |
US4185337A (en) * | 1978-09-26 | 1980-01-29 | Thetford Corporation | Portable toilet with improved flush apparatus |
-
1988
- 1988-09-27 CA CA000578591A patent/CA1282908C/en not_active Expired - Fee Related
- 1988-09-29 NZ NZ22638288A patent/NZ226382A/en unknown
- 1988-10-17 EP EP19900102080 patent/EP0371008B1/en not_active Expired
- 1988-10-17 EP EP19880309695 patent/EP0314358B1/en not_active Expired
- 1988-10-17 DE DE8888309695T patent/DE3861514D1/en not_active Expired - Fee Related
- 1988-10-17 AU AU23955/88A patent/AU602259B2/en not_active Ceased
- 1988-10-17 DE DE19883876630 patent/DE3876630T2/en not_active Expired - Fee Related
-
1990
- 1990-05-24 AU AU55863/90A patent/AU623259B2/en not_active Ceased
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3015281A (en) * | 1960-02-23 | 1962-01-02 | Cederholm R F D 1 | Portable liquid pump |
US3570018A (en) * | 1968-04-25 | 1971-03-16 | Thetford Corp | Portable toilet |
US4185337A (en) * | 1978-09-26 | 1980-01-29 | Thetford Corporation | Portable toilet with improved flush apparatus |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0597489A1 (en) * | 1992-11-13 | 1994-05-18 | Kohler Co. | Pump operated plumbing fixture |
US5542132A (en) * | 1992-11-13 | 1996-08-06 | Kohler Co. | Pump operated plumbing fixture |
US5729837A (en) * | 1992-11-13 | 1998-03-24 | Kohler Co. | Pump operated plumbing fixture |
US5913611A (en) * | 1992-11-13 | 1999-06-22 | Kohler Co. | Pump operated plumbing fixture |
EP1069250A2 (en) * | 1992-11-13 | 2001-01-17 | Kohler Co. | Pump operated plumbing fixture |
EP1069250A3 (en) * | 1992-11-13 | 2001-01-24 | Kohler Co. | Pump operated plumbing fixture |
Also Published As
Publication number | Publication date |
---|---|
AU2395588A (en) | 1989-04-27 |
AU5586390A (en) | 1990-09-13 |
DE3876630T2 (en) | 1993-04-08 |
EP0314358A1 (en) | 1989-05-03 |
EP0371008A3 (en) | 1991-11-06 |
EP0371008B1 (en) | 1992-12-09 |
NZ226382A (en) | 1990-09-26 |
DE3876630D1 (en) | 1993-01-21 |
CA1282908C (en) | 1991-04-16 |
EP0314358B1 (en) | 1991-01-09 |
AU623259B2 (en) | 1992-05-07 |
DE3861514D1 (en) | 1991-02-14 |
AU602259B2 (en) | 1990-10-04 |
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