CA1201623A - Centrifugal pump having semi-axial diffusion and dual discharge for hydromassage bathtub units - Google Patents
Centrifugal pump having semi-axial diffusion and dual discharge for hydromassage bathtub unitsInfo
- Publication number
- CA1201623A CA1201623A CA000414559A CA414559A CA1201623A CA 1201623 A CA1201623 A CA 1201623A CA 000414559 A CA000414559 A CA 000414559A CA 414559 A CA414559 A CA 414559A CA 1201623 A CA1201623 A CA 1201623A
- Authority
- CA
- Canada
- Prior art keywords
- pump
- impeller
- fluid
- discharge
- diffuser
- 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.)
- Expired
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- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
CENTRIFUGAL PUMP HAVING SEMI-AXIAL DIFFUSION
AND DUAL DISCHARGE FOR HYDROMASSAGE BATHTUB UNITS
Abstract A centrifugal pump for use in hydromassage bathtub units is provided that is compact, self-draining and self-venting, and which complies with all applicable governmental health and safety regulations. The pump includes a centered inlet port and a pair of opposed upper and lower discharge ports. The pump impeller and diffuser plate assembly provide for semi-axial diffusion of fluid within the pump, thereby reducing the overall size of the pump. The pump is self-drained through the lower discharge port when not in operation, and air trapped within the pump is vented through the upper discharge port.
AND DUAL DISCHARGE FOR HYDROMASSAGE BATHTUB UNITS
Abstract A centrifugal pump for use in hydromassage bathtub units is provided that is compact, self-draining and self-venting, and which complies with all applicable governmental health and safety regulations. The pump includes a centered inlet port and a pair of opposed upper and lower discharge ports. The pump impeller and diffuser plate assembly provide for semi-axial diffusion of fluid within the pump, thereby reducing the overall size of the pump. The pump is self-drained through the lower discharge port when not in operation, and air trapped within the pump is vented through the upper discharge port.
Description
AND DUAL DISCHARGE FOR HYDROMASSAGE BATHTUB UNITS
Background of the Invention 1. Field of the Invention This invention relates to a centrifugal pump for hydromassage bathtub units. More particul-arly, it concerns a cen~rifugal pump having a single, centered inlet port, upper and lower discharge ports, an impeller configured for semi-axial diffusion of fluid within the pump, and a fluid directing diffuser plate.
Background Art Hydromassage bathtub units typically employ a centrifugal pump to circula~e water within a tub. The pump is connected by a 1uid line to nozæle jets fitted in the sidewall of a tub. Circulation of pressurized water delivered to the tub through the sidewall nozzles provides atherapeutic, massaging bath.
Installation of hydromassage units is subject to several government promulgated heal~h and safety regulations. The amount of water retained in a hydromassage unit when not in use, for instance, can be no more than a specified amount such that the build-up o:E algae and slime is inhibited. In that regard, all piping in the system must have a minimum slope so that the piping will self-drain when the bathtub is empty.
Additional design constraints stem from the fact that, at least in hydromassage bathtub units installed in the home, the pump and associated plumbing are preferably installed out of view.
Pumps for hydromassage bathtub units, thereore, A~ ~ag~
~20~.t~3 1 have typically been installed under the apron of the bathtub in the space between the tub sidewall and the wall of the room in which the tub is installed.
The previous pumps used in conjunction with hydromassage bathtub units have had a single, centered inlet port and a single discharge port.
The discharge port has been placed in an uppermost position relative to the p~np casing such that gases trapped within the pump casing can vent through the discharge port. Previous pumps, therefore, have only drained to a level slightly below the inlet port when the pump is not in operation and substantial amounts of water have been retained in the pump casing. Although drfl;n;ng of th~, pump casing could be accomplished by providing a d~ain pipe in the lower portion of the pump, such a drain pipe would decrease the output pressure of the fluid at the sidewall jet nozzles. Moreover, merely pro-viding a conventional pump with a lower dischargeport in connection with an uppermost discharge port would not solve the drainage problem, since the piping from such a lowermost discharge port would have to slope downwardly to ensure drainage of the Pump when the pump is not in use. In this regard, conventional pump units have been relatively bulky, and it is not possible to place a conventional purnp high enough under the apron of a bathtub so that a lower discharge port from the pump would be higher than the bathtub sidewall jet nozzles. It is to be understood that the jet nozzles must be above a certain m;n~m1lm height in the bathtub to provide an adequate stream of circulating water for therapeutic purposes. Merely decreasing the size of a conventional pump so that it may be placed 1 higher under the apron of a bàthtub results in a corresponding decrease in the output potential oE
the pump.
A pump for hydromassage bathtub units that included both a lowermost and uppermost dis-charge port, and which was small enough to be mounted at an elevated position under a bathtub apron, and would deliver an adequate flow and pressure of water for therapeutic massage purposes, would be a decided advantage.
Summary of the Invention The problems outlined above are in large measure solved by the centrifugal pump for hydromassage bathtub units in accordance with the present invention. That is to say, a pump in accordance with the present invention includes upper and lower discharge ports, is substantially smaller than that of conventional pumps now in use for hydromassage bathtub units, and delivers an output flow and pressure of fluid from the pump more than adequate for hydromassage application.
The pump for hydromassage bathtub units in accordance with the present inventio~ broadly includes a pump casing having a centered inlet port and upper and lower discharge ports, an impeller rotatably mounted within the pump casing modified for semi-axial discharge of fluid from the impeller, and a diffuser plate for distributing the fluid discharged from the impeller around the circumference of the pump casing at a uniform pressure.
1 Brief Description of ~he Drawings Figure 1 is a side elevational view of a bathtub having a hydromassage unit installed therein and employing a centrifugal pump in accord-ance with the present invention;
Fig. 2 is a side elevational view of a pump in accordance with the present invention;
Fig, 3 is a front elevational view of a pump in accordance with the present invention;
Fig. 4 is an enlarged vertical sectional view taken along the line 4-4 of Fig. 3;
Fig. 5~is a sectional view taken along the line 5-5 of Fig. 4 with portions of the pump broken away for clarity;
Fig, 6` is an enlarged fragmentary vertical sectional view of a portion of the diffuser assembly;
Fig. 7 is an enlarged fragmentary ver~ical sectional view of the diffuser assembly; and Fig. 8 is similar to Fig. 7 but with a peripheral edge of ~he diffuser removed for clarity.
Deta`iled Description of the Drawings A hydromassage bathtub unit 10 employing a pump 12 in accordance with the present invention is depicted in Fig. 1 in conjunction with a bathtub 14. The bathtub 14 includes a plurality of nozzle jets 16 connected to pump 12 by a fluid line 18, and a pump intake aperture 20 connected to pump 12 by a line 22. The pump 12 is supported on a stand 24, and is located under the apron portion 26 of the tub. The tub includes a drain 28.
Pump 12 includes a motive section 28 comprising an electric motor 30 having a drive shaft 32, and a fluid directing section 34, both 1 mounted on base stand 36. As best seen in Fig. 4, the fluid directing section 34 includes an intake portion 38 comprising an inlet port 40, impeller 42 and impeller chamber 44. The fluid directing section 34 also includes a discharge portion 46 that includes upper and lower discharge ports 48, 50, diffuser structure 52 and discharge chamber 54. A front shroud 55 fits over the fluid directing section.
The impeller 42 includes a front plate 56, rear plate 58, and a plurality of arcuate impeller arms 60 interposed between and fixedly interconnecting the front and rear plate.s. The front plate 56 includes a centered fluid receiving aperture 62 coaxially oriented with inlet port 40.
A circular flange 64 extends around aperture 62 and projects outwardly from the front plate 56. A
support shaft 66 projects rearwardly from rear plate 58, and is fixedly received on motor shaft 32 for rotation therewith. A water deflecting slinger 68 is fixedly mounted on shaft 66.
The front shroud 55 is connected to a support bracket 70 by a plurality of screws (not shown). Diffuser plate 72 is interposed between front shroud 55 and bracket 70. Shaft 66 is received through a centered aperture within bracket 70, and an annular washer 74 is supported by the bracket and surrounds shaft 66. A sealing washer 76 is supported by collar 78, and is maintained in water tight sealing relationship with washer 74 by spring 8Q.
Front shroud 55 includes annular flanges 81, 82 and 84 projecting outwardly and forwardly from upper discharge port 48, inlet port 40 and lower discharge port 50 respectively to define 1 axially oriented channels. Impeller chamber 44 is defined in part by an annular sidewall 86 extending inwardly from front shroud 55. Sidewall 86 includes a lowermost drainage slot 88. The uppermost portion of front shroud 55 defines a rearwardly directed channel 90.
Referring to Figs. 6, 7 and 8, it will be seen that the diffuser structure 52 is comprised in part from structure associated with bracket 70, and in part from structure associated with diffuser plate 72 that complementally engages the bracket 70. The bracket diffuser structure includes a plurality of circumferentially spaced apart, outwardly extending vanes 92. Each vane 92 includes a radially oriented face 94, a sloped, generally axially oriented, fluid directing face 96, and an arcuate fluid directing face 98. The faces 94 include a diffuser plate engaging rib 99. Diffuser plate 72 includes a plurality of circumferentially 2Q spaced apart vanes 100 that include a generally axially oriented, sloped face 102 that essentially comprise extensions of the sloped faces 96 of bracket vanes 92. Diffuser plate 72 also includes a plurality of circumferentially spaced apart, channel defining projections 104 that include an axially oriented face 106 and radially oriented face 108. The diffuser plate 72 and bracket 70 cooperatively define, through their vanes and projections, a series of water directing channels 110 that direct fluid flow from the impeller 42, outwardly through channels 110 into discharge chamber 54. Discharge chamber 54 includes flow-blocking stop 112.
In operation, pump 12 is mounted as high as possible under apron 26 of tub 14 such that the 1 lowermost discharge port 50 is at a higher elevation than the jetted nozzles 16. Although the perspective of Fig. 1 permits a showing of only the lower discharge port 50 connected to tub nozzle jet 16, it is to be understood that in normal operation both the upper and lower discharge ports 48, 50 are connected to nozzle jets 16. The upper discharge port 48 can be vented through either rearwardly acing channel 90, or the forwardly facing channel defined by flange 80, although normally only one of the two channels will be used and the other channel will be plugged.
Once the tub 14 is filled with water, the pump 12 can be operated and water will be circulated through intake aperture 20 through fluid line 22 to the pump inlet port 40. Water taken in through inlet port 40 is directed through impeller aperture 62 and thrust radially outwardly by impeller arms 60. Discharge from the impeller arms 60 is directed semi-axially due to the fact that impeller rear plate 58 is of a smaller diameter than the impeller front plate 44. The smaller relative diameter of rear plate 58 therefore permits the impeller chamber 44 to be of a diameter only slightly greater than the diameter of front plate 56, thereby reducing the overall size of the pump. Water is directed from the impeller 42 through diffuser channels 110 and is directed outwardly by the diffuser structure 52 so as to provide essentially uniform fluid pressure around the perimeter of the discharge chamber 54. Flow blocking plate 112 prevents fluid within the discharge chamber 54 from merely circulating in a rotational manner, and the fluid within the discharge chamber is therefore vented through the upper and
Background of the Invention 1. Field of the Invention This invention relates to a centrifugal pump for hydromassage bathtub units. More particul-arly, it concerns a cen~rifugal pump having a single, centered inlet port, upper and lower discharge ports, an impeller configured for semi-axial diffusion of fluid within the pump, and a fluid directing diffuser plate.
Background Art Hydromassage bathtub units typically employ a centrifugal pump to circula~e water within a tub. The pump is connected by a 1uid line to nozæle jets fitted in the sidewall of a tub. Circulation of pressurized water delivered to the tub through the sidewall nozzles provides atherapeutic, massaging bath.
Installation of hydromassage units is subject to several government promulgated heal~h and safety regulations. The amount of water retained in a hydromassage unit when not in use, for instance, can be no more than a specified amount such that the build-up o:E algae and slime is inhibited. In that regard, all piping in the system must have a minimum slope so that the piping will self-drain when the bathtub is empty.
Additional design constraints stem from the fact that, at least in hydromassage bathtub units installed in the home, the pump and associated plumbing are preferably installed out of view.
Pumps for hydromassage bathtub units, thereore, A~ ~ag~
~20~.t~3 1 have typically been installed under the apron of the bathtub in the space between the tub sidewall and the wall of the room in which the tub is installed.
The previous pumps used in conjunction with hydromassage bathtub units have had a single, centered inlet port and a single discharge port.
The discharge port has been placed in an uppermost position relative to the p~np casing such that gases trapped within the pump casing can vent through the discharge port. Previous pumps, therefore, have only drained to a level slightly below the inlet port when the pump is not in operation and substantial amounts of water have been retained in the pump casing. Although drfl;n;ng of th~, pump casing could be accomplished by providing a d~ain pipe in the lower portion of the pump, such a drain pipe would decrease the output pressure of the fluid at the sidewall jet nozzles. Moreover, merely pro-viding a conventional pump with a lower dischargeport in connection with an uppermost discharge port would not solve the drainage problem, since the piping from such a lowermost discharge port would have to slope downwardly to ensure drainage of the Pump when the pump is not in use. In this regard, conventional pump units have been relatively bulky, and it is not possible to place a conventional purnp high enough under the apron of a bathtub so that a lower discharge port from the pump would be higher than the bathtub sidewall jet nozzles. It is to be understood that the jet nozzles must be above a certain m;n~m1lm height in the bathtub to provide an adequate stream of circulating water for therapeutic purposes. Merely decreasing the size of a conventional pump so that it may be placed 1 higher under the apron of a bàthtub results in a corresponding decrease in the output potential oE
the pump.
A pump for hydromassage bathtub units that included both a lowermost and uppermost dis-charge port, and which was small enough to be mounted at an elevated position under a bathtub apron, and would deliver an adequate flow and pressure of water for therapeutic massage purposes, would be a decided advantage.
Summary of the Invention The problems outlined above are in large measure solved by the centrifugal pump for hydromassage bathtub units in accordance with the present invention. That is to say, a pump in accordance with the present invention includes upper and lower discharge ports, is substantially smaller than that of conventional pumps now in use for hydromassage bathtub units, and delivers an output flow and pressure of fluid from the pump more than adequate for hydromassage application.
The pump for hydromassage bathtub units in accordance with the present inventio~ broadly includes a pump casing having a centered inlet port and upper and lower discharge ports, an impeller rotatably mounted within the pump casing modified for semi-axial discharge of fluid from the impeller, and a diffuser plate for distributing the fluid discharged from the impeller around the circumference of the pump casing at a uniform pressure.
1 Brief Description of ~he Drawings Figure 1 is a side elevational view of a bathtub having a hydromassage unit installed therein and employing a centrifugal pump in accord-ance with the present invention;
Fig. 2 is a side elevational view of a pump in accordance with the present invention;
Fig, 3 is a front elevational view of a pump in accordance with the present invention;
Fig. 4 is an enlarged vertical sectional view taken along the line 4-4 of Fig. 3;
Fig. 5~is a sectional view taken along the line 5-5 of Fig. 4 with portions of the pump broken away for clarity;
Fig, 6` is an enlarged fragmentary vertical sectional view of a portion of the diffuser assembly;
Fig. 7 is an enlarged fragmentary ver~ical sectional view of the diffuser assembly; and Fig. 8 is similar to Fig. 7 but with a peripheral edge of ~he diffuser removed for clarity.
Deta`iled Description of the Drawings A hydromassage bathtub unit 10 employing a pump 12 in accordance with the present invention is depicted in Fig. 1 in conjunction with a bathtub 14. The bathtub 14 includes a plurality of nozzle jets 16 connected to pump 12 by a fluid line 18, and a pump intake aperture 20 connected to pump 12 by a line 22. The pump 12 is supported on a stand 24, and is located under the apron portion 26 of the tub. The tub includes a drain 28.
Pump 12 includes a motive section 28 comprising an electric motor 30 having a drive shaft 32, and a fluid directing section 34, both 1 mounted on base stand 36. As best seen in Fig. 4, the fluid directing section 34 includes an intake portion 38 comprising an inlet port 40, impeller 42 and impeller chamber 44. The fluid directing section 34 also includes a discharge portion 46 that includes upper and lower discharge ports 48, 50, diffuser structure 52 and discharge chamber 54. A front shroud 55 fits over the fluid directing section.
The impeller 42 includes a front plate 56, rear plate 58, and a plurality of arcuate impeller arms 60 interposed between and fixedly interconnecting the front and rear plate.s. The front plate 56 includes a centered fluid receiving aperture 62 coaxially oriented with inlet port 40.
A circular flange 64 extends around aperture 62 and projects outwardly from the front plate 56. A
support shaft 66 projects rearwardly from rear plate 58, and is fixedly received on motor shaft 32 for rotation therewith. A water deflecting slinger 68 is fixedly mounted on shaft 66.
The front shroud 55 is connected to a support bracket 70 by a plurality of screws (not shown). Diffuser plate 72 is interposed between front shroud 55 and bracket 70. Shaft 66 is received through a centered aperture within bracket 70, and an annular washer 74 is supported by the bracket and surrounds shaft 66. A sealing washer 76 is supported by collar 78, and is maintained in water tight sealing relationship with washer 74 by spring 8Q.
Front shroud 55 includes annular flanges 81, 82 and 84 projecting outwardly and forwardly from upper discharge port 48, inlet port 40 and lower discharge port 50 respectively to define 1 axially oriented channels. Impeller chamber 44 is defined in part by an annular sidewall 86 extending inwardly from front shroud 55. Sidewall 86 includes a lowermost drainage slot 88. The uppermost portion of front shroud 55 defines a rearwardly directed channel 90.
Referring to Figs. 6, 7 and 8, it will be seen that the diffuser structure 52 is comprised in part from structure associated with bracket 70, and in part from structure associated with diffuser plate 72 that complementally engages the bracket 70. The bracket diffuser structure includes a plurality of circumferentially spaced apart, outwardly extending vanes 92. Each vane 92 includes a radially oriented face 94, a sloped, generally axially oriented, fluid directing face 96, and an arcuate fluid directing face 98. The faces 94 include a diffuser plate engaging rib 99. Diffuser plate 72 includes a plurality of circumferentially 2Q spaced apart vanes 100 that include a generally axially oriented, sloped face 102 that essentially comprise extensions of the sloped faces 96 of bracket vanes 92. Diffuser plate 72 also includes a plurality of circumferentially spaced apart, channel defining projections 104 that include an axially oriented face 106 and radially oriented face 108. The diffuser plate 72 and bracket 70 cooperatively define, through their vanes and projections, a series of water directing channels 110 that direct fluid flow from the impeller 42, outwardly through channels 110 into discharge chamber 54. Discharge chamber 54 includes flow-blocking stop 112.
In operation, pump 12 is mounted as high as possible under apron 26 of tub 14 such that the 1 lowermost discharge port 50 is at a higher elevation than the jetted nozzles 16. Although the perspective of Fig. 1 permits a showing of only the lower discharge port 50 connected to tub nozzle jet 16, it is to be understood that in normal operation both the upper and lower discharge ports 48, 50 are connected to nozzle jets 16. The upper discharge port 48 can be vented through either rearwardly acing channel 90, or the forwardly facing channel defined by flange 80, although normally only one of the two channels will be used and the other channel will be plugged.
Once the tub 14 is filled with water, the pump 12 can be operated and water will be circulated through intake aperture 20 through fluid line 22 to the pump inlet port 40. Water taken in through inlet port 40 is directed through impeller aperture 62 and thrust radially outwardly by impeller arms 60. Discharge from the impeller arms 60 is directed semi-axially due to the fact that impeller rear plate 58 is of a smaller diameter than the impeller front plate 44. The smaller relative diameter of rear plate 58 therefore permits the impeller chamber 44 to be of a diameter only slightly greater than the diameter of front plate 56, thereby reducing the overall size of the pump. Water is directed from the impeller 42 through diffuser channels 110 and is directed outwardly by the diffuser structure 52 so as to provide essentially uniform fluid pressure around the perimeter of the discharge chamber 54. Flow blocking plate 112 prevents fluid within the discharge chamber 54 from merely circulating in a rotational manner, and the fluid within the discharge chamber is therefore vented through the upper and
2~
1 lower discharge ports 48, 50.
It is not unusual during normal operation of a centrifugal pump for gas to be accumulated within the discharge chamber. As will be appreciated, gases within the discharge chamber 54 of the pump 12 will automatically rise and vent through the uppermost discharge port 48.
Water r~mAin;ng within the fluid directing section once the operation of pump 12 is secured, will drain through the lowermost discharge port 50. Water within the discharge chamber 54 will drain directly through the port 50, and water within the impeller chamber 44 will vent through slot 88 and then through discharge port 50.
1 lower discharge ports 48, 50.
It is not unusual during normal operation of a centrifugal pump for gas to be accumulated within the discharge chamber. As will be appreciated, gases within the discharge chamber 54 of the pump 12 will automatically rise and vent through the uppermost discharge port 48.
Water r~mAin;ng within the fluid directing section once the operation of pump 12 is secured, will drain through the lowermost discharge port 50. Water within the discharge chamber 54 will drain directly through the port 50, and water within the impeller chamber 44 will vent through slot 88 and then through discharge port 50.
Claims (5)
1. A centrifugal pump for circulating fluid within a hydromassage bathtub unit, including:
a motive section and a fluid directing section;
structure associated with said fluid directing section defining an intake portion having a centered inlet port, and a discharge portion having upper and lower discharge ports;
an impeller rotatably mounted within said intake portion having--a front plate including structure defining a centered aperture coaxially oriented in fluid receiving relationship with said inlet port;
a rear plate spaced apart from said front plate; and a plurality of impeller arms interposed between said front and rear plates, said rear plate being of a smaller diameter than said front plate, for semi-axial discharge of said fluid from said impeller;
diffuser structure fixedly positioned within said discharge portion including a plurality of radially spaced apart out-wardly directed arms, said impeller and diffuser structure coopera-tively oriented for providing a generally uniform operating pressure along the perimeter of said discharge portion, and said upper and lower discharge ports providing for self-venting and self-draining of said fluid directing section, respectively.
a motive section and a fluid directing section;
structure associated with said fluid directing section defining an intake portion having a centered inlet port, and a discharge portion having upper and lower discharge ports;
an impeller rotatably mounted within said intake portion having--a front plate including structure defining a centered aperture coaxially oriented in fluid receiving relationship with said inlet port;
a rear plate spaced apart from said front plate; and a plurality of impeller arms interposed between said front and rear plates, said rear plate being of a smaller diameter than said front plate, for semi-axial discharge of said fluid from said impeller;
diffuser structure fixedly positioned within said discharge portion including a plurality of radially spaced apart out-wardly directed arms, said impeller and diffuser structure coopera-tively oriented for providing a generally uniform operating pressure along the perimeter of said discharge portion, and said upper and lower discharge ports providing for self-venting and self-draining of said fluid directing section, respectively.
2. A pump as claimed in Claim 1, said intake portion including an annular sidewall defining an impeller chamber, said sidewall separating said impeller chamber from said dis-charge portion and, said sidewall including structure defining a lowermost drainage slot com-municating said impeller chamber with said dis-charge portion.
3. A pump as claimed in Claim 1, said lower discharge port including structure defining a forwardly extending, axially oriented channel.
4. A pump as claimed in Claim 1, said upper discharge port including structure defining a forwardly extending, axially oriented channel and a rearwardly extending, axially oriented channel.
5. A pump as claimed in Claim 1, said diffuser structure comprising a plurality of com-plementally engaging diffuser pieces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000414559A CA1201623A (en) | 1982-10-29 | 1982-10-29 | Centrifugal pump having semi-axial diffusion and dual discharge for hydromassage bathtub units |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000414559A CA1201623A (en) | 1982-10-29 | 1982-10-29 | Centrifugal pump having semi-axial diffusion and dual discharge for hydromassage bathtub units |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1201623A true CA1201623A (en) | 1986-03-11 |
Family
ID=4123851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000414559A Expired CA1201623A (en) | 1982-10-29 | 1982-10-29 | Centrifugal pump having semi-axial diffusion and dual discharge for hydromassage bathtub units |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1201623A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2008202188B2 (en) * | 2007-05-16 | 2010-02-11 | Premark Feg L.L.C. | Double delivery pump for an electric household appliance and electric houseshold appliance equipped therewith |
-
1982
- 1982-10-29 CA CA000414559A patent/CA1201623A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2008202188B2 (en) * | 2007-05-16 | 2010-02-11 | Premark Feg L.L.C. | Double delivery pump for an electric household appliance and electric houseshold appliance equipped therewith |
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| MKEX | Expiry |