WO2013120145A1 - Jug assembly for a blender. - Google Patents
Jug assembly for a blender. Download PDFInfo
- Publication number
- WO2013120145A1 WO2013120145A1 PCT/AU2013/000139 AU2013000139W WO2013120145A1 WO 2013120145 A1 WO2013120145 A1 WO 2013120145A1 AU 2013000139 W AU2013000139 W AU 2013000139W WO 2013120145 A1 WO2013120145 A1 WO 2013120145A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- jug
- blade
- hub
- sweeper
- blender
- Prior art date
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
- A47J43/046—Machines for domestic use not covered elsewhere, e.g. for grinding, mixing, stirring, kneading, emulsifying, whipping or beating foodstuffs, e.g. power-driven with tools driven from the bottom side
-
- 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
- A47J43/0716—Parts or details, e.g. mixing tools, whipping tools for machines with tools driven from the lower side
- A47J43/0722—Mixing, whipping or cutting tools
-
- 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
Definitions
- the invention relates to blenders and more particularly to a blade assembly for a blender.
- Blenders are used in domestic and commercial environments for mixing, liquefying, blending and crushing ice.
- a blender comprises a base that contains a motor and a jug that fits onto the base.
- the jug has a blade assembly that is retained by the jug and driven by the motor in the base.
- the design of the blade assembly contributes significantly to the performance of the blender.
- the performance, durability and servicing of the blades is enhanced by the bearing case (or blade assembly hub), bearings and other components that are used to affix the blades to the interior of the jug.
- Figure 1 is a perspective view of a blade assembly and its
- bearing case or hub having three main or sweeper blades and three upper blades.
- Figure 2A is a side elevation of the blade assembly with hub
- Figure 2B is a cross section through the blade assembly and hub depicted in Figure 2A.
- Figure 2C is a side elevation of a blade assembly and hub.
- Figure 2D is another embodiment of the assembly depicted in
- Figure 2E is a plan view of a blade assembly.
- Figure 2F is a plan view of an alternate embodiment of the
- Figure 2G is a plan view of a blade assembly with width tapered main blades.
- Figure 2H is a plan view of a blade assembly with backward swept main blades.
- Figure 2I is a plan view of a blade assembly with main blades having a straight leading edge and a swept trailing edge.
- Figures 3A-3C are perspective views of portions, cross sectioned
- Figure 4 is a cross section of a blade assembly and polymeric fixing nut.
- Figure 4A is a cross section of a alternate method of retaining the blades utilising a threaded hub or bearing case and retaining nut that are protected by a cover.
- Figure 5 is a perspective view of a blender base having a square, upright neck and circular throat.
- Figure 6 is an underside perspective view of a jug with a square collar or skirt within which is located the jug's hub.
- Figure 7 is a cross sectional view through the collar and neck area of a jug mounted onto a base.
- Figure 8 is a cross section through line A-A of Figure 7.
- Figure 9 is a plan view of a three bladed main blade for a blender.
- Figure 10 is a cross section through line A-A of Figure 9.
- Figure 11 is a cross section through line B-B of Figure 9.
- Figure 12 is an enlargement of detail C shown in Figure 11.
- Figure 13 is a top plan view of a three bladed sweeper blade, in accordance with the teachings of the invention.
- Figure 14 is a cross section through line C-C of Figure 13.
- Figure 15 is a perspective view of a three bladed sweeper blade in accordance with the teachings of the invention.
- Figure 16 is a top plan view of a two bladed sweeper blade in accordance with the teachings of the invention. Best Mode and Other Embodiments
- a blade assembly 10 for a blender and the shaft 12 that retains the blade assembly are supported by a central bearing case or hub 11.
- the vertical shaft 12 is supported by two spaced apart ball bearing sets contained within the case or hub 11.
- the uppermost portion of the shaft 12 retains a nut 13 that is used to retain the blade assembly.
- An opposite end of the shaft 12 supports a male coupling component 14 that is driven by a cooperating coupling on the base of the blender.
- the hub 11 may optionally be provided with threads 15.
- a nut may be used to draw the upper flange 16 of the bearing case or hub into a sealing engagement with the inside or upper surface of the floor of the jug.
- the blade assembly further comprises three main or sweeper blades 17 formed from a single blank or body and spaced above them, three shorter upper blades 18 also on a single blank.
- the main blades are spaced 120 degrees apart
- the upper blades are cold pressed or deep drawn in stages to a final shape and spaced 120 degrees apart.
- the angular offset between the main and the preferably shorter upper blades is, for example, 60 degrees.
- the upper blades 18 are preferably three in number.
- the upper blades 18 are formed on a single blank or body having a common central area 19.
- Each of the three upper blades 18 shorter than any of the three main blades 17.
- the upper blades preferably have serrated leading edges. Each blade is angled differently with respect to the horizontal. In preferred embodiments, a first of the upper blades 18A is angled at 22 degrees. A second of the main blades 18B is angled at 44 degrees. A third of the upper blades 18C is angled at 66 degrees. However, other angles may be used.
- the three main or sweeper blades 17 are also formed from a single blank having a common hub area through which the shaft 12 passes. The main blades may optionally be serrated.
- the main or sweeper blades 17 are spaced above the flange 11.
- the main blades 17 have an upward bend or smooth curvature that corresponds with the curvature of the interior of the jug 20.
- the main blades 17 are not serrated but, the upper blades 18 are serrated.
- both the leading edge 21 and the trailing edge 22 of each main blade 17 are swept forward, that is, into or toward the direction of rotation.
- the upper blades 18 have a serrated and generally linear leading edge 23 and a straight trailing edge 24.
- the blades taper in chord (or width) form a minimum chord at the tip 25 to a maximum chord toward the root 26 of each of the upper blades 18.
- the chord of the main blade 17 also increases form a minimum at the tip 27 to a maximum chord at or toward the root 28.
- the central and vertical shaft 12 is supported by bearings 30 located within the hub 11.
- the shaft 12 passes through a cylindrical spacer 31 that locates the upper blades 18 a fixed distance above the main blades 17.
- a plastic or rivet-like deformation of the upper tip 32 of the shaft may be used to retain a blade keeper 33 that maintains the upper blades 18 in contact with the top of the spacer 31.
- a seal 34 at the lower terminal end of the hub 11 prevents the ingress of food and dirt into the interior of the hub.
- the coupling 14 is retained by a threaded fastener 35 that engages a cooperating blind bore 36 formed in the lower end of the shaft 12.
- An "L" shaped seal 37 surrounds the circumference of the flange 16 and prevents the contents of the jug from entering the space between the hub 11 and the jug.
- the vertical height or vertical elevation 40 of the tips 41 of the three main blades 17 may be the same. However, in an alternate embodiment, and as shown in the Figure 2D, the vertical elevation of each tip 42, 43, 44 may be different. This provides increased tip exposure to the contents of the jug, fewer dead zones, and thereby potentially increases the performance of the blades.
- each of the tips 50, 51, 52 of the main blades can be the same.
- the effective radius of the blade tips 53, 54 and 55 may be different.
- the leading edges are concave or inwardly curved.
- the trailing edge is swept or convex.
- the main blades 17 may have a straight leading edge 60 and/or a straight or angled trailing edge 61.
- the blades are curved upwardly as suggested by Figure 1 and have upwardly turned blade tips 62, also as suggested by Figures 1, 2A and 2B.
- the main blades 17 are swept backward, having a convex curvature 70 in the direction of rotation 71 and a concave trailing edge 72.
- the main blades 17 have a tapering width or chord. The narrowest portion of the chord occurs toward the tip 80 of each main blade 17.
- each of the three main blades has a straight leading edge 120 and a swept back trailing edge 121.
- Each of the three upper blades 122 have a straight and serrated leading edge 123 and a straight, swept or angled trailing edge 123.
- each of the three upper blades is different. See Figures 1-2D.
- the upward or vertical curvature of the main blades is accomplished by cold pressing or deep draw pressing.
- the blade assembly 10 is retained in an opening 100 that is located at the bottom of the jug 101.
- the flange 102 of the bearing case or hub 148 forms a sealing engagement with the "L" shaped seal 37.
- the threaded lower portion 103 of the bearing case engages the co-operating threads of a fixing nut 104 in preferred embodiments, the fixing nut 104 is fabricated from the same material as the jug 101.
- the underside of the jug's flat fixing surface comprises a circular groove for retaining an O-ring 105. The O-ring 105 seals against the flat upper surface of the fixing nut 104.
- the fixing nut may be provided with a radial extension through which a fastener 106 may be inserted and threaded into a co-operating boss 107 formed into the underside of the jug 101.
- the underside 108 of the fixing nut further comprises a through opening 109 through which the shaft extends and around which the shaft is sealed by a "V" seal 110.
- the polymeric fixing nut may also be affixed by heat staking or ultrasonic welding to the underside of the jug.
- the arrangement also allows the blade assembly and the fixing of it to be re-worked during manufacturing with less effort when compared with some other prior art solutions.
- the trapping of food is minimised because the outer surface of the fixing nut is smoothly blended with the shape of the jug as illustrated in the intersection between the two parts 111.
- FIG. 4A An alternate to the example depicted in Figure 4 is illustrated in Figure 4A.
- the threaded portion of the bearing case or hub 103 being at an opposite end of the bearing case to the upper flange, is retained by a threaded nut 130 that is not affixed to the jug by retaining screws.
- the threaded nut 130 (and the hub 11) are located beneath and protected by a hub cover 131.
- a part of the threaded end protrudes from a lower surface of the jug's hub so that the threads can be engaged by the nut 130.
- the nut 130 draws the flange 149 inot engagement with the jug and preferably the seal 149a located between the flange and an interior of the jug.
- the "L" shaped seal is contained within a circular recess in the floor of the jug as is a prtial thickness of the flange.
- the outer rim of the flange 149b is chamferred to make the transition between the flange and the jug's floor smoother.
- the upper edge 132 of the hub cover 131 is sealed with respect to an adjacent portion of the jug 133 by a "L" shaped elastomeric seal 134.
- the hub cover 131 forms a protective and easy to clean cap over the hub and is optionally retained onto the jug by longitudinal or vertically oriented, threaded (or other) fasteners 135.
- the fasteners 35 are located radially inward of the circumferential seal 134.
- the hub cover 131 has a circumferential groove 136 that cooperates with a circumferential ring 137 formed on an underside of the jug.
- the jug has a landing 138 for the threaded nut 130 that is radially inward of the ring 137.
- the hub cover 131 has an opening 139 featuring a step 140 that is used to retain an optionally separate insert 141.
- the insert 141 has a central opening for receiving the blade shaft 142.
- the insert also features an over-moulded metal plate 143 that defines at least a portion of the lowermost surface of the insert 141.
- the over-moulded (or separately applied) metal plate 143 acts as a covering and thus contact surface for the lip seal 144 that is interposed between the insert 141 and the male coupling component 145 that is attached to a lower end of the shaft 142.
- the plate 143 has an outer rim 146 that is moulded into or at least partially embedded into the insert 141.
- the circumferential edge of the insert is stepped to cooperate with the step 140 formed into the cover.
- the outer surface of the insert is flush with the outer surface of the cover.
- an o-ring seal 147 is interposed between the insert 141 and the cover 131.
- the cover 131 presents a slightly domed under surface 150 and its outer, cylindrical circumference is flush with the outer surface 152 of the lower portion of the jug 133.
- the cover 131 is made from the same polymer as the jug.
- a base 160 for a blender has four relatively flat sides 161 interconnected by rounded corners 162.
- the flat sides 161 surround an upwardly directed surface 163 that carries the user interface 164.
- An uppermost part of the base 160 comprises an upright neck 165.
- the neck 165 has four relatively flat side 166 and within the confines of the flat sides, a generally circular neck 167.
- the cavity formed by the neck 167 may have a vertical gap or slot 168 for allowing the contents of the neck 167 to drain.
- the female coupling 169 associated with the blender's motor is located within the neck 167.
- the purpose of the neck 165 is to support and orient the blender's jug.
- the jug 170 has a downwardly extending skirt or collar 171 that fits over and conforms with the shape of the neck 165 depicted in Figure 5.
- the jug's hub 172 is located within the collar 171.
- the male coupling 170 associated with the jug's blade assembly is central to both the hub 172 and the collar 171. Because the collar 171 and neck 165 each have four sides, the jug 170 is capable of four different orientations with respect to the base. Apart from the hub 172 and the opening 175, the interior of the collar and the surface of the underside of the jug 176 are unobstructed by ribs or structures that impede easy cleaning.
- the blender's microprocessor 174 it is useful for the blender's microprocessor 174 to be able to act on information relating to the presence of absence of the jug 170 on the base 160.
- the jug's hub 200 carries magnets 202 that cooperate with one or more Hall sensors 205 located adjacent to the throat 208 of the base or neck.
- a pair of magnets are carried beneath the hub cover 204, that is, trapped and sealed by the hub cover 204 against an underside or landing 138 formed as an under surface of the hub 200.
- the north and south poles of the magnets 202 are oriented in a horizontal plane and in line with the one or more Hall effect sensors 205.
- the magnets 202 are provided on opposite sides of the hub, and located on a common diameter of the hub so as to be 180 degrees apart from one another along an imaginary line connecting opposite corners of the generally square collar of the jug.
- the Hall sensor is located immediately adjacent to the side wall of the throat 207. By locating the Hall effect sensor or sensors behind the side will of the throat 207, the throat 207 is free from protrusions that might impede easy cleaning.
- the Hall effect sensors 205, 206 are provided as a pair, 90 degrees apart with reference to the centre of rotation 211 of the motor, the male and female couplings and the blade's shaft.
- the location of the Hall effect sensors 205, 206 corresponds to the front left and right corners, within the neck 165, preferably adjacent to the upper surface of the neck 213 (see Figures 5 and 7).
- the magnets 202 in the hub 200 are located along a line that connects a pair of opposite corners 212, 213 of the jug's skirt 171.
- the Hall effect sensors are of a type that does not require movement of the magnets in order to register the magnets magnetic field.
- the Hall effect sensors 205, 206 are chip mounted and oriented toward the facing pole of an adjacent magnet 202.
- the sensors 205, 206 are retained by brackets 214 located within the neck 165.
- the blender's microprocessor 174 receives signals or information from the Hall effect sensors 205, 206 and prevents power from being supplied to the motor unless one or more of the magnets associated with the hub are detected.
- main or sweeper blades Typically, main or sweeper blades run at about 10,000 rpm or less. Sweeper blades constructed in accordance with the present invention are capable of speeds in a range or 20-24,000 rpm. Blades operating at these higher speeds must resist unwanted deflection and deformation. Accordingly, they must be strong and rigid but without having excessive weight, particularly at the blade tips. Accordingly, the following construction details have been developed through careful design, observation and testing.
- a three bladed main or sweeper blade component 17, 250 is constructed preferably from stainless steel having a thickness of 2-2.5mm.
- the three equally spaced blades are formed on a single blank through which is formed the central opening 251 preferably having flat opposing sides 252 for receiving and restraining the shaft 12.
- the sweeper blades 250 In order to sit correctly onto the shaft and be properly affixed to the blade assembly, the sweeper blades 250 must have a central region that is flat on both the top and bottom surfaces.
- the central flat region is approximately circular 253, being concentric with respect to the rotational centre of the shaft, and have a diameter of approximately 19mm.
- the measurements provided herein should be taken by way of example and with reference to a blade having an overall tip diameter of approximately 85- 90mm.
- Each of the three blades in this example are tapered in width, having a maximum width toward the centre and a minimum width at the blade tip. In preferred embodiments, the blades are not twisted.
- the leading edge 254 of a blade is connected to the trailing edge 255 of an adjacent blade by a smooth transition section 256.
- the curved transition section 256 lacks any vertical corners or stress concentrating areas.
- the hub area of the three bladed sweeper blade component is defined by a circle whose maximum radius is defined by that point where the transition section 256 is closest to the centre of the blade 250. The hub area contains the flat region.
- the diameter of the hub area is approximately 25.4mm. Because of the upward curvature of the blades, that portion of the hub area that lies radially outside the flat zone 253 is upwardly curved and thereby strengthened, having a vertical cross sectional thickness that is greater than the thickness of the blank from which the blade is formed (2-
- Each of the three individual blades is said to have a root chord or width 258 that is measured transversely to the longitudinal axis of a blade 259 at a location that corresponds to an inflection point 260.
- the inflection point 260 is where the smoothly curved transition section 256 changes to the straight line defining the leading edge 254 of a blade.
- This chord or width at the inflection point 260 is approximately 17.27 mm.
- Another important chord or width is the chord of the blade at that inflection point along the longitudinal centre line 259 where the blade turns upward 261 into the upturned blade tip 262.
- the blade tip chord 261 is approximately 6.78 mm. It will be
- the blade tip chord 261 is too great, the blade tip is too heavy and the blade requires more effort to rotate. Where the chord 261 is too small, the blade lacks effective strength. In plan view, the projected distance between the two chords in this example 258, 261 is approximately 22.56 mm.
- the distance between the root chord 258 and the centre line of the blade 250 is approximately 13 mm.
- each individual blade 270 in the main or sweeper blades curves upwardly.
- the upward curvature begins radially outward from a point 271 corresponding to the outer perimeter of the blade hub's flat region 253.
- the blade curvature is smooth and extends upwardly by a distance X that represents the distance from the bottom surface of the main blade 272 to the inflexion point 273 where the upward curvature of the blade tip 274 begins.
- the distance X is equivalent to about .45 times the overall projected length of the blade as measured from the blade's centre line 275 to the outermost point of the blade 276.
- X may correspond to as little as .225 of the projection length Y (seen from above) but is preferably never greater than .5 of the overall projected length Y.
- the height of the blade tip 277 is shown in Figure 10 as the distance Z as is preferably 2.5mm or more. It is preferred to have a smooth radius in the transition of the upper surface from the upward curvature of the blade to the upright blade tip 277.
- the radius of the bend between the upper, curved part of the blade and the blade tip is about 3mm or more.
- the tip of the blade is bevelled with reference to a horizontal plane, reaching a maximum vertical height at the leading edge 281 and having a reduced height at the trailing edge 282. This bevelling of the tip reduces the mass of the tip.
- the hub area of the sweeper blade is seen as having an apparent thickness in the vertical direction 290 that exceeds the thickness 291 of the area within the flat region 253. This is owing to the upward curvature of the blade in those areas outside of the generally circular flat region 253.
- This design principle applies equally to a sweeper blade with two blades, three blades or more than three blades.
- the central and essentially circular part of the sweeper blade's hub is circular or generally circular.
- the upward curvature in the circular or generally circular region of the hub 301 lying radially outward of the flat region 300 forms a bowl or cup shape between the flat region 300 and each of the three blades 302.
- the upward curvature exists in the area 303 between each of the blades 302 and the flat region 300 and also in that part of the outer zone of the hub area that is between adjacent blades, that is, adjacent to the inflexion point 305 that defines the transition between leading edge 306 and the adjacent trailing edge 307.
- a sweeper blade 310 in some examples has three individual blades 311.
- This particular sweeper blade 310 can be thought of as having a hub area 312 comprising all of the areas that are radially inward of the three blades.
- the individual blades 311 are defined as being radially outward of the chord 313 that tranverses each blade, perpendicular to the longitudinal axis of the blade 314 at that point where the leading edge 316 of a blade begins to curve toward the trailing edge of an adjacent blade, thereby defining an inflexion point 315.
- the hub area can thus be thought of as all of the area between each of the three chords 313 and the centre of the sweeper blade 316.
- all of the surface within the boundary of the three chords 313 is upwardly curved except for the circular of generally circular flat region 320.
- bowl shaped hub area 330 includes a central and circular or generally circular flat area 337.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Food Science & Technology (AREA)
- Food-Manufacturing Devices (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/378,968 US9750372B2 (en) | 2012-02-17 | 2013-02-17 | Tri-blade assembly for blender |
AU2013220938A AU2013220938B2 (en) | 2012-02-17 | 2013-02-18 | Jug assembly for a blender. |
EP13749675.8A EP2814365B1 (en) | 2012-02-17 | 2013-02-18 | Jug assembly for a blender. |
RU2014137460A RU2611984C2 (en) | 2012-02-17 | 2013-02-18 | Jug assembly for a blender |
CN201380020312.2A CN104244783A (en) | 2012-02-17 | 2013-02-18 | Jug assembly for a blender |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2012900567A AU2012900567A0 (en) | 2012-02-17 | Tri-Blade Assembly for Blender | |
AU2012900567 | 2012-02-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2013120145A1 true WO2013120145A1 (en) | 2013-08-22 |
Family
ID=48983468
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AU2013/000139 WO2013120145A1 (en) | 2012-02-17 | 2013-02-18 | Jug assembly for a blender. |
Country Status (6)
Country | Link |
---|---|
US (1) | US9750372B2 (en) |
EP (1) | EP2814365B1 (en) |
CN (3) | CN203389577U (en) |
AU (1) | AU2013220938B2 (en) |
RU (1) | RU2611984C2 (en) |
WO (1) | WO2013120145A1 (en) |
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Also Published As
Publication number | Publication date |
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AU2013220938B2 (en) | 2017-04-20 |
CN104244783A (en) | 2014-12-24 |
CN203389577U (en) | 2014-01-15 |
US9750372B2 (en) | 2017-09-05 |
EP2814365B1 (en) | 2020-01-01 |
EP2814365A4 (en) | 2015-11-25 |
RU2611984C2 (en) | 2017-03-01 |
RU2014137460A (en) | 2016-04-10 |
CN106724945B (en) | 2019-11-08 |
EP2814365A1 (en) | 2014-12-24 |
US20150023130A1 (en) | 2015-01-22 |
CN106724945A (en) | 2017-05-31 |
AU2013220938A1 (en) | 2014-09-11 |
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