WO1999012458A1 - Food mixer with impeller with reversible rotation - Google Patents

Food mixer with impeller with reversible rotation Download PDF

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Publication number
WO1999012458A1
WO1999012458A1 PCT/AU1998/000734 AU9800734W WO9912458A1 WO 1999012458 A1 WO1999012458 A1 WO 1999012458A1 AU 9800734 W AU9800734 W AU 9800734W WO 9912458 A1 WO9912458 A1 WO 9912458A1
Authority
WO
WIPO (PCT)
Prior art keywords
impeller
food
container
food mixer
mixer
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.)
Ceased
Application number
PCT/AU1998/000734
Other languages
French (fr)
Inventor
Anthony Charles Lawson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US09/508,291 priority Critical patent/US6467948B1/en
Priority to JP2000510361A priority patent/JP2001515738A/en
Priority to EP98941161A priority patent/EP1011402B1/en
Priority to DE69825295T priority patent/DE69825295T2/en
Priority to AU89662/98A priority patent/AU8966298A/en
Publication of WO1999012458A1 publication Critical patent/WO1999012458A1/en
Anticipated expiration legal-status Critical
Priority to US09/866,891 priority patent/US6488403B2/en
Ceased legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J43/00—Implements for preparing or holding food, not provided for in other groups of this subclass
    • A47J43/04—Machines for domestic use not covered elsewhere, e.g. for grinding, mixing, stirring, kneading, emulsifying, whipping or beating foodstuffs, e.g. power-driven
    • A47J43/07—Parts or details, e.g. mixing tools, whipping tools
    • A47J43/08—Driving mechanisms
    • A47J43/085—Driving mechanisms for machines with tools driven from the lower side
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S261/00—Gas and liquid contact apparatus
    • Y10S261/16—Cream whipping

Definitions

  • This invention relates to the area of food processing and in
  • a single blade is used and this blade may either be shaped as in a dough hook or have a surface which is open and through and around which the material being mixed passes.
  • Such mixers and blenders however are usually not particularly efficient at breaking up flour lumps and such like and do not homogenise mixtures in a safe and splash free way. In particular most mixers do not readily blend small
  • the mixer of the invention uses a single impeller, rather than the twin beater concept, which is adapted to drive various mixing devices as appropriate.
  • the invention in its broadest sense is a food mixer which includes a container having an impeller adapted to be driven by drive means adjacent the lower surface of the container and
  • impeller is adapted both to cooperate with various mixing devices and to rotate in either the clockwise or anticlockwise direction. It is preferred that the impeller be centrally mounted within
  • impeller itself may be of any desired shape. It is also preferred that the impeller be able to be driven in both the clockwise and
  • the impeller is a relatively short tubular shaped member with a mixing member attached thereto with the upper end of the impeller being provided with a dome shaped cap with a dimpled or serrated lower surface which aids in breaking up food lumps remaining once the food has been cut, or otherwise processed, and which also helps reduce the possibility of contact between implements inserted in the container and any cutting means used.
  • This cap also assists in minimising splash and enhancing the lateral spread of ingredients during mixing.
  • central impeller shafts which may extend up to any height in the container and which can be provided with mixing or other
  • Fig.l shows the invention fitted with a hybrid chopper device and an interior lid to adjust for different quantities of foodstuffs
  • Fig. 2 shows an embodiment of the invention with a threaded central impeller and a mixing device
  • Fig. 3 shows an embodiment of the invention in which the impeller is provided with a whisking device and an inside lid
  • Fig. 4 shows an embodiment of the invention in which the impeller is fitted with a cap which may shield a cutting or mixing device below it;
  • a container 10 is provided with a central impeller shaft 20 which can be driven from below the lower surface of the substantially cylindrical container 10.
  • a hybrid chopper/blade device 30 is also provided which can be passed
  • central impeller shaft may extend up to any height inside the container in this embodiment it extends
  • a lid 70 if it is desired that a funnelled opening 80 be provided for the insertion of food material.
  • the arrangement of the chopper/blade assembly 30 is such that a preferably plastic scooping blade 31 extends at an angle to the vertical from the centre of one side of the device and terminates at the container edge, the lower edge of the blade 31 being parallel to and just slightly above the lower inside edge of the container.
  • the device On the opposite side of the impeller shaft from the scooping blade the device is provided with an essentially horizontal preferably arcuate shaped chopping blade 32, preferably of metal, which in a preferred embodiment has a face which cuts or chops when the impeller shaft is rotated clockwise but does not chop when it is rotated anticlockwise.
  • This combination of a scooping blade 31 used in combination with a chopping blade 32 dramatically improves the mixer's ability to cut hard vegetables evenly.
  • the mixing and chopping blades of this invention be able, if required, to move up an down the central shaft by way of a groove 33 in the shaft, with the chopper assembly's up and down movement being largely determined by the sense of rotation of the impeller, or be located at different heights within the container by fixing the mixing assembly being used at some chosen height via the use of at least one fastening device locating on the central shaft.
  • the chopper/blade assembly 30 is preferably used (as shown in Figure 1) in combination with a deflector disc 40 which can be slid down over the impeller shaft above the chopper blade.
  • This deflector disc 40 is basically an annulus which covers
  • the internal area of the container and acts as an effective inside lid.
  • the arrangement is such that the hub 41 of the disc is slid over the upper part of the impeller in sufficient proximity to the impeller to allow the deflector disc to be oriented at right angles to the container wall while freely allowing the impeller shaft 20 to rotate within a central aperture in the hub and the disc.
  • This aperture needs to be sufficiently large to avoid any grooves on the impeller shaft.
  • Vertical grooves are provided in the interior wall of the central portion of the hub to allow for the release of any pressure build-up under the deflector disc when blending hot ingredients. This feature also allows the user to drain off any excess liquid from a mixture without first having to remove the contents .
  • the function of the deflector disc is that it restricts the ingredients to be mixed to the lower part of the container and
  • This action is particularly useful when a mixture of liquids and solids is being blended and prevents splashing. In addition it acts to deflect food particles flung up by the scooper blade into the path of the cutter blade and directs them back down to the cutter blade again.
  • the underside of the deflector disc be serrated or otherwise roughened to further aid in breaking up lumps of food.
  • the deflector disc can be made from any appropriate material, in this preferred embodiment it is made of a transparent material so that the contents of the mixer are not obscured.
  • the perimeter of the disc may also be provided with a rim of
  • the disc while fitting firmly within the container, should still be able to move in the vertical sufficiently to accommodate expansion of the mixture being
  • the deflector disc used in combination with the chopper blade is highly efficient, certain combinations of ingredients can still bind together in such a way that they deposit in positions within the container which avoid the blades. For this reason the direction of rotation of the chopper blade combination is able to be reversed, preferably slowly, so that the contents of the mixer can be agitated or stirred without being chopped. This feature is desirable not only for providing even mixing but for stirring in additional material when no further chopping action is required.
  • scoop/paddle device 55 which comprises a set of plastic mixing paddles. These are similar in shape to the chopper/blade device previously described however the essentially horizontal "blade” 52 is symmetrical about its centerline and the scooping paddle 51 is quite flexible to allow doughs, and other mixes which may become compacted, to pass beneath it. It is also further envisaged that the assembly could be spring mounted so as to lift over obstacles.
  • the scoop/paddle device 55 is located about a spiral threaded screw impeller device 50 such that when the impeller is driven clockwise there is a downward screwing action on the material, or dough, being kneaded such that the dough is gently forced down onto the paddles causing it to roll around the container between its walls and the central impeller and provide gentle kneading.
  • a central impeller 20 is provided with whisk devices 60 which are used for light mixture whipping of food materials such as egg whites.
  • whisk devices 60 which are used for light mixture whipping of food materials such as egg whites.
  • the disc 40 or inner lid be used to assist in spreading the food ingredients laterally and to help prevent splashing.
  • FIG. 4 Another embodiment of the invention ( Figure 4) provides a short impeller 20, which may be provided with any mixing device at its base, at the top of which is a dome shaped cap which has several functions. One of these is to cover any food processing device and protect it from contact with implements inserted into the container. Another is to aid in the lateral spread of food products being processed.
  • Another feature of this cap is that its lower face is dimpled or serrated in order to aid in the breaking up of lumps of food once that food has been otherwise processed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Food Science & Technology (AREA)
  • Food-Manufacturing Devices (AREA)

Abstract

A food mixer which includes a container having an impeller adapted to be driven by drive means adjacent the lower surface of the container and which impeller is adapted both to cooperate with various mixing devices and to rotate in either the clockwise or anti-clockwise direction.

Description

FOOD MIXER WITH IMPELLER WITH REVERSIBLE ROTATION
This invention relates to the area of food processing and in
particular to a food mixer or blender capable of carrying out
various food processing functions more efficiently than previous such mixers .
BACKGROUND TO THE INVENTION
Most food mixers are based on pairs of beaters which rotate about parallel axes so that the beater heads inter-engage and the material being mixed tends to pass between the heads.
In some other applications, where heavier materials are being beaten or kneaded, a single blade is used and this blade may either be shaped as in a dough hook or have a surface which is open and through and around which the material being mixed passes. Such mixers and blenders however are usually not particularly efficient at breaking up flour lumps and such like and do not homogenise mixtures in a safe and splash free way. In particular most mixers do not readily blend small
amounts of substances such as mayonnaise. Most mixers also become sluggish in their movement as more ingredients are added and the contents of the mixer become
more viscous. Additionally, chopper type blades in such mixers
tend to have a crushing effect on materials added, such as chocolate chips, and do not provide an even consistency.
It is an object of this invention to provide a mixer which permits effective mixing of food products while minimising the problems outlined above.
OUTLINE OF THE INVENTION
The mixer of the invention uses a single impeller, rather than the twin beater concept, which is adapted to drive various mixing devices as appropriate.
The invention in its broadest sense is a food mixer which includes a container having an impeller adapted to be driven by drive means adjacent the lower surface of the container and
which impeller is adapted both to cooperate with various mixing devices and to rotate in either the clockwise or anticlockwise direction. It is preferred that the impeller be centrally mounted within
a substantially symmetrical container however the container
itself may be of any desired shape. It is also preferred that the impeller be able to be driven in both the clockwise and
anti-clockwise directions.
In one embodiment of the invention it may be preferred that the impeller is a relatively short tubular shaped member with a mixing member attached thereto with the upper end of the impeller being provided with a dome shaped cap with a dimpled or serrated lower surface which aids in breaking up food lumps remaining once the food has been cut, or otherwise processed, and which also helps reduce the possibility of contact between implements inserted in the container and any cutting means used. This cap also assists in minimising splash and enhancing the lateral spread of ingredients during mixing.
It is however preferred that the mixer be provided with
central impeller shafts which may extend up to any height in the container and which can be provided with mixing or other
devices as required. In order that the invention may be more readily understood
embodiments of it by way of non limiting example will be
described here with reference to the following diagrams :
Fig.l shows the invention fitted with a hybrid chopper device and an interior lid to adjust for different quantities of foodstuffs; Fig. 2 shows an embodiment of the invention with a threaded central impeller and a mixing device; Fig. 3 shows an embodiment of the invention in which the impeller is provided with a whisking device and an inside lid; Fig. 4 shows an embodiment of the invention in which the impeller is fitted with a cap which may shield a cutting or mixing device below it;
Considering first the embodiment of the invention shown in Figure 1. A container 10 is provided with a central impeller shaft 20 which can be driven from below the lower surface of the substantially cylindrical container 10. A hybrid chopper/blade device 30 is also provided which can be passed
over the central shaft until adjacent the lower face of the
container. While in general the central impeller shaft may extend up to any height inside the container in this embodiment it extends
the full height of the container which may be closed with an
optional lid 70 if it is desired that a funnelled opening 80 be provided for the insertion of food material.
The arrangement of the chopper/blade assembly 30 is such that a preferably plastic scooping blade 31 extends at an angle to the vertical from the centre of one side of the device and terminates at the container edge, the lower edge of the blade 31 being parallel to and just slightly above the lower inside edge of the container.
On the opposite side of the impeller shaft from the scooping blade the device is provided with an essentially horizontal preferably arcuate shaped chopping blade 32, preferably of metal, which in a preferred embodiment has a face which cuts or chops when the impeller shaft is rotated clockwise but does not chop when it is rotated anticlockwise.
The sense of rotation is not however a restriction on the
inventive concept nor need the blade be sharp on only one side and it is envisaged that a useful embodiment of the invention may be provided by a cutting action when the rotation was in
reverse.
This combination of a scooping blade 31 used in combination with a chopping blade 32 dramatically improves the mixer's ability to cut hard vegetables evenly.
If it is desired that aeration be provided as well as mixing the blades described can either be roughened in some manner or be perforated with holes. In practice I have found the latter method to produce the best results .
It is also envisaged that the mixing and chopping blades of this invention be able, if required, to move up an down the central shaft by way of a groove 33 in the shaft, with the chopper assembly's up and down movement being largely determined by the sense of rotation of the impeller, or be located at different heights within the container by fixing the mixing assembly being used at some chosen height via the use of at least one fastening device locating on the central shaft.
The chopper/blade assembly 30 is preferably used (as shown in Figure 1) in combination with a deflector disc 40 which can be slid down over the impeller shaft above the chopper blade.
This deflector disc 40 is basically an annulus which covers
the internal area of the container and acts as an effective inside lid.
The arrangement is such that the hub 41 of the disc is slid over the upper part of the impeller in sufficient proximity to the impeller to allow the deflector disc to be oriented at right angles to the container wall while freely allowing the impeller shaft 20 to rotate within a central aperture in the hub and the disc. This aperture needs to be sufficiently large to avoid any grooves on the impeller shaft.
Vertical grooves are provided in the interior wall of the central portion of the hub to allow for the release of any pressure build-up under the deflector disc when blending hot ingredients. This feature also allows the user to drain off any excess liquid from a mixture without first having to remove the contents .
The function of the deflector disc is that it restricts the ingredients to be mixed to the lower part of the container and
prevents them being spread to areas of the container where
they cannot be further processed.
This action is particularly useful when a mixture of liquids and solids is being blended and prevents splashing. In addition it acts to deflect food particles flung up by the scooper blade into the path of the cutter blade and directs them back down to the cutter blade again.
It may also be preferred that the underside of the deflector disc be serrated or otherwise roughened to further aid in breaking up lumps of food.
Although the deflector disc can be made from any appropriate material, in this preferred embodiment it is made of a transparent material so that the contents of the mixer are not obscured.
The perimeter of the disc may also be provided with a rim of
silicone rubber or other appropriate material to maintain
close contact with the container wall if that is desired, alternately it may be a loose fit as shown in Figure 3 to allow food material to pass into the lower part of the
container or to allow the disc to "float" above the food
material being mixed while the weight of the hub could act to
confine the ingredients to the minimum space required.
Whatever method is used the disc, while fitting firmly within the container, should still be able to move in the vertical sufficiently to accommodate expansion of the mixture being
processed.
Although the deflector disc used in combination with the chopper blade is highly efficient, certain combinations of ingredients can still bind together in such a way that they deposit in positions within the container which avoid the blades. For this reason the direction of rotation of the chopper blade combination is able to be reversed, preferably slowly, so that the contents of the mixer can be agitated or stirred without being chopped. This feature is desirable not only for providing even mixing but for stirring in additional material when no further chopping action is required.
In a further embodiment of the invention (Figure 2) a
scoop/paddle device 55 is provided which comprises a set of plastic mixing paddles. These are similar in shape to the chopper/blade device previously described however the essentially horizontal "blade" 52 is symmetrical about its centerline and the scooping paddle 51 is quite flexible to allow doughs, and other mixes which may become compacted, to pass beneath it. It is also further envisaged that the assembly could be spring mounted so as to lift over obstacles.
In this embodiment of the invention the scoop/paddle device 55 is located about a spiral threaded screw impeller device 50 such that when the impeller is driven clockwise there is a downward screwing action on the material, or dough, being kneaded such that the dough is gently forced down onto the paddles causing it to roll around the container between its walls and the central impeller and provide gentle kneading.
While various devices can be used in conjunction with the spiral impeller it has been my experience that, when the spiral impeller is driven through an epicyclic gear set at about 300 rpm, its motion is sufficiently slow as to not damage implements or fingers which may be inserted into the container and also that there is no need for a lid to contain the dough. In this embodiment of the invention the scoop/paddle device functions in two ways dependant on the sense of rotation of
the impeller.
When running in a clockwise direction the ingredients are lifted into the path of the essentially horizontal paddle 52 thus aerating flour and such like and evenly distributing fat into the mixture for light fluffy pastries.
With conventionally shaped blades some mixtures have a tendency to compact in such a way that the blades cease to have any effect. However when the impeller of the invention is driven in an anti-clockwise direction the mixture is churned up and the mixing action resumes.
The sense of rotation could of course be reversed using a non conventionally threaded impeller however the above described arrangement is preferred.
In a further embodiment of the invention shown in Figure 3 a central impeller 20 is provided with whisk devices 60 which are used for light mixture whipping of food materials such as egg whites. In this embodiment it is preferred that the disc 40 (or inner lid) be used to assist in spreading the food ingredients laterally and to help prevent splashing.
Another embodiment of the invention (Figure 4) provides a short impeller 20, which may be provided with any mixing device at its base, at the top of which is a dome shaped cap which has several functions. One of these is to cover any food processing device and protect it from contact with implements inserted into the container. Another is to aid in the lateral spread of food products being processed.
Another feature of this cap is that its lower face is dimpled or serrated in order to aid in the breaking up of lumps of food once that food has been otherwise processed.
It can be seen that there are many possible applications for the concept of the invention and that, while I have described herein various embodiments of the invention, any combination or variation in the features of the invention previously described lie within the concept of the invention.

Claims

The claims defining the invention are as follows:
1. A food mixer which includes a container having an impeller adapted to be driven by drive means adjacent the lower surface of the container and which impeller is adapted both to cooperate with various mixing devices and to rotate in either the clockwise or anti-clockwise direction.
2. A food mixer as claimed in claim 1 in which the impeller is a substantially tubular shaped member mounted centrally within the container which is substantially symmetrically shaped.
3. A food mixer as claimed in claim 2 having a chopper/blade assembly adapted to locate over the impeller at the base of the container.
4. A food mixer as claimed in claim 3 having a deflection disc located about the impeller to act as an internal lid above food being processed.
5. A food mixer as claimed in claim 4 in which the container is provided with a lid with a funnel shaped aperture
through which food may be input.
6. A food mixer as claimed in claimed in claim 2 having a scoop/paddle device adapted to locate over the impeller adjacent the base of the container.
7. A food mixer as claimed in claim 6 in which the impeller is screw threaded such that the scoop/paddle device can rotate along it.
8. A food mixer as claimed in claim 7 such that when the impeller is driven in a clockwise direction there is effected a downwards kneading action on the food material being processed.
9. A food mixer as claimed in claim 7 in which motion of the impeller in a first direction results in effective lifting and aerating of food products while motion of the
impeller in a second reverse direction results in a
compacting process suitable for mixing dense food
materials.
10. A food mixer as claimed in claim 2 wherein the impeller is provided with at least one whisk device to whip lighter food products and which whisk devices are located adjacent the base of the container.
11. A food mixer as claimed in claim 10 wherein a deflection disc is located about the impeller above the food products being processed.
12. A food mixer as claimed in claim 2 wherein the impeller height is significantly less than that of the container and a dome shaped cap is located at the top thereof and is of sufficient diameter to cover any food processing devices below it .
13. A food mixer as claimed in claim 12 in which the cap has a lower face which is dimpled or serrated.
PCT/AU1998/000734 1997-09-10 1998-09-09 Food mixer with impeller with reversible rotation Ceased WO1999012458A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US09/508,291 US6467948B1 (en) 1997-09-10 1998-09-09 Food mixer with dome-shaped impeller
JP2000510361A JP2001515738A (en) 1997-09-10 1998-09-09 Hood mixer with reversible impeller
EP98941161A EP1011402B1 (en) 1997-09-10 1998-09-09 Food mixer with impeller with reversible rotation
DE69825295T DE69825295T2 (en) 1997-09-10 1998-09-09 KITCHEN MIXER FOR REVERSIBLE DIRECTION
AU89662/98A AU8966298A (en) 1997-09-10 1998-09-09 Food mixer with impeller with reversible rotation
US09/866,891 US6488403B2 (en) 1997-09-10 2001-05-29 Food mixer with whisk attachment

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPO9087 1997-09-10
AUPO9087A AUPO908797A0 (en) 1997-09-10 1997-09-10 Improved food mixer

Related Child Applications (3)

Application Number Title Priority Date Filing Date
US09/508,291 A-371-Of-International US6467948B1 (en) 1997-09-10 1998-09-09 Food mixer with dome-shaped impeller
US09/508,291 Continuation US6467948B1 (en) 1997-09-10 1998-09-09 Food mixer with dome-shaped impeller
US09/915,416 Continuation US6523994B2 (en) 1997-09-10 2001-07-26 Food mixer with screw-threaded impeller

Publications (1)

Publication Number Publication Date
WO1999012458A1 true WO1999012458A1 (en) 1999-03-18

Family

ID=3803372

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1998/000734 Ceased WO1999012458A1 (en) 1997-09-10 1998-09-09 Food mixer with impeller with reversible rotation

Country Status (7)

Country Link
US (3) US6467948B1 (en)
EP (1) EP1011402B1 (en)
JP (1) JP2001515738A (en)
CN (2) CN1524479A (en)
AU (1) AUPO908797A0 (en)
DE (1) DE69825295T2 (en)
WO (1) WO1999012458A1 (en)

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DE69825295D1 (en) 2004-09-02
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US20020044496A1 (en) 2002-04-18
CN1135096C (en) 2004-01-21
EP1011402A1 (en) 2000-06-28
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US6523994B2 (en) 2003-02-25
US6488403B2 (en) 2002-12-03
DE69825295T2 (en) 2005-07-14
CN1269703A (en) 2000-10-11
CN1524479A (en) 2004-09-01
EP1011402B1 (en) 2004-07-28
US20010046183A1 (en) 2001-11-29
AUPO908797A0 (en) 1997-10-02

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